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TEXAS INSTRUMENTS bq2057 bq2057C bq2057T bq2057W handbook

1. BAT Rei bq2057 SNS COMP BAT cc RB2 vss BAT TS STAT Figure 8 Optional Voltage Divider for Nonstandard Regulation Voltage Low Side Current Sensing The 692057 monitors the charging current during the voltage regulation phase The 692057 declares done condition and terminates charge when the current tapers off to the charge termination threshold lrrggyy A new charge cycle begins when the battery voltage falls below the V RCH threshold battery temperature monitoring The bq2057 continuously monitors temperature by measuring the voltage between the TS and VSS pins A negative or a positive temperature coefficient thermistor NTC PTC and an external voltage divider typically develop this voltage See Figure 9 The bq2057 compares this voltage against its internal V TS1 V rg2 thresholds to determine if charging is allowed See Figure 10 The temperature sensing circuit is immune to any fluctuation in Vcc since both the external voltage divider and the internal thresholds V rs4 and 2 are referenced to VCC The resistor values of 1 and 2 are calculated by the following equations For NTC Thermistors 5 x Ry xR H TC i 3 R Rre Pr 5 Ryo 2 6 x 7 Rr Wy TEXAS INSTRUMENTS www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION battery t
2. Ip gt 1 V Gsth gt 3 5 V and in a TSSOP package Wy TEXAS INSTRUMENTS www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION selecting input capacitor In most applications all that is needed is a high frequency decoupling capacitor A 0 1 uF ceramic placed in proximity to VCC and VSS pins works well The bq2057 works with both regulated and unregulated external dc supplies If a non regulated supply is chosen the supply unit should have enough capacitance to hold up the supply voltage to the minimum required input voltage at maximum load If not more capacitance must be added to the input of the charger selecting output capacitor The bq2057 does not require any output capacitor for loop stability The user can add output capacitance in order to control the output voltage when a battery is not present The charger quickly charges the output capacitor to the regulation voltage but the output voltage decays slowly because of the low leakage current on the BAT pin down to the recharge threshold Addition of a 0 14 F ceramic capacitor for instance results in a 100 mV pp ripple waveform with an approximate frequency of 25Hz Higher capacitor values can be used if a lower frequency is desired automatic charge rate compensation To reduce charging time the bq2057 uses the proprietary AutoComp technique to compensate safely for internal impedance of the batter
3. APPLICATION INFORMATION RSNS Q1 020 FZT788B PACK DC e sue G EN 0 1 Ime NTC s E RT1 TEMP c2 0 1 uF D1 Battery GND gt Rr2 Pack 2 Figure 1 Low Dropout Single or Two Cell Li lon Li Pol Charger functional description The 042057 is an advanced linear charge controller for single or two cell Li lon or Li Pol applications Figure 1 shows the schematic of charger using a PNP pass transistor Figure 2 is an operational state diagram and Figure 3 is a typical charge profile Figure 4 shows the schematic of a charger using P channel MOSFET vy TEXAS INSTRUMENTS www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION Sleep Mode No Indicate SLEEP MODE STAT Hi Z gt ChSeked al All Times Suspend Charge Indicate CHARGE SUSPEND STAT Hi Z TS Pin in TS1 to TS2 Range No Regulate V BAT V min Yes Indicate Charge In Progress STAT High TS Pin in TS1 to TS2 Range Regulate Current or Voltage Indicate Charge In Progress Suspend Charge Indicate CHARGE SUSPEND STAT Hi Z Yes STAT High V BAT lt V min Suspend Charge TS Pin
4. I TERM current detect sensing and to Vss for low side sensing threshold 0 TA lt 50 TEMPERATURE COMPARATOR Lower temperature V TS1 throshold 29 1 30 30 9 Upper temperature pini vate YN CC TS2 threshold PRECHARGE COMPARATOR ss Precharge 3 04 3 1 3 16 min threshold 5 98 6 1 6 22 bq2057 2 94 3 3 06 6 18 6 3 6 43 PRECHARGE CURRENT REGULATION Voltage at pin SNS relative to for high side n i sensing and to Vgs for low side sensing 13 mV recharge curren o o 0 lt lt 50 regulation Voltage at pin SNS relative to for high side sensing 0 C lt TA lt 50 C Vcc 5 V COMPARATOR Battery Recharge Threshold O REG VO REG vol REG Recharge 98 RN 100 mV V RCH threshold Vo REG VO REG VO REG 196 200 S04 N CHARGE RATE COMPENSATION AutoComp V BAT 0 3 Vs VCC lt 692057 bq2057C bq2057T bq2057W V BAT 0 3 V lt lt VCC max bq2057T and bq2057W low side sensing configuration G COMP gain STAT PIN Output low VOL STAT voltage Ts Output high VOH STAT 1 2 5 mA 9 5 Vongcj Output ow voltage 5 sig lo cc Sink current Not to exceed power rating specification Pp 49 Texas INSTRUMENTS 6 www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002
5. Br BQ2057TSTR ACTIVE TSSOP PW 8 2000 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb Br BQ2057TSTRG4 ACTIVE TSSOP PW 8 2000 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb Br BQ2057TTS ACTIVE TSSOP PW 8 150 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057TTSG4 ACTIVE TSSOP PW 8 150 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057TTSTR ACTIVE TSSOP PW 8 2000 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057TTSTRG4 ACTIVE TSSOP PW 8 2000 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057WSN ACTIVE SOIC D 8 75 Green RoHS amp CUNIPDAU Level 1 260C UNLIM no Sb Br BQ2057WSNTR ACTIVE SOIC D 8 2500 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb Br BQ2057WSNTRG4 ACTIVE SOIC D 8 TBD Call Call BQ2057WTS ACTIVE TSSOP PW 8 150 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057WTSG4 ACTIVE TSSOP PW 8 150 Green RoHS amp CUNIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057WTSTR ACTIVE TSSOP PW 8 2000 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br The marketing status values are defined as follows ACTIVE Product device recommended for new designs LIFEBUY TI has announced that the device will be discontinued and a lifetime buy period is in effect NRND Not recommended for new designs Device is in production to support existing customers but does not recommend using this part in a new design PR
6. the current The sense resistor can be on either the high or low side of the battery without additional components The constant current phase continues until the battery reaches the charge regulation voltage bq2057xDGK MSOP DGK PACKAGE TOP VIEW VCC 10 8 15 2 7 SNS STAT 3 6 COMP VSS 4 5 CC Please be aware that an important notice concerning availability standard warranty and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet Copyright 2002 Texas Instruments Incorporated EXAS INSTRUMENTS www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 DESCRIPTION continued bq2057 then begins the constant voltage phase The accuracy of the voltage regulation is better than 1 over the operating temperature and supply voltage ranges For single and dual cells the bq2057 is offered in four fixed voltage versions 4 1 V 4 2 V 8 2 V and 8 4 V Charge stops when the current tapers to the charge termination threshold bq2057 automatically restarts the charge if the battery voltage falls below the V RCH threshold The designer also may use the AutoComp feature to reduce charging time This proprietary technique allows safe and dynamic compensation for the internal impedance of the battery pack during charge AVAILAB
7. 35 TEXAS INSTRUMENTS See bq2057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE AND TWO CELL LITHIUM ION AND LITHIUM POLYMER FEATURES Ideal for Single 4 1 V or 4 2 V and Dual Cell 8 2 V or 8 4 V Li lon or Li Pol Packs Requires Small Number of External Components 0 3 V Dropout Voltage for Minimizing Heat Dissipation Better Than 1 Voltage Regulation Accuracy With Preset Voltages AutoComp Dynamic Compensation of Battery Pack s Internal Impedance to Reduce Charge Time Optional Cell Temperature Monitoring Before and During Charge Integrated Voltage and Current Regulation With Programmable Charge Current and High or Low Side Current Sensing Integrated Cell Conditioning for Reviving Deeply Discharged Cells and Minimizing Heat Dissipation During Initial Stage Of Charge Charge Status Output for Single or Dual Led or Host Processor Interface Automatic Battery Recharge Feature Charge Termination by Minimum Current Automatic Low Power Sleep Mode When Is Removed EVMs Available for Quick Evaluation Packaging 8 Pin SOIC 8 Pin TSSOP 8 Pin MSOP bq2057xSN or bq2057xTS SOIC SN or TSSOP TS PACKAGE TOP VIEW SNS 19 8 COMP BAT 2 7 CC VCC 3 6 VSS TS 4 5 STAT AutoComp is a trademark of Texas Instruments PROD
8. C 1 YEAR no Sb Br BQ2057DGKG4 ACTIVE MSOP DGK 8 80 Green RoHS amp CUNIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057DGKR ACTIVE MSOP DGK 8 2500 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057DGKRG4 ACTIVE MSOP DGK 8 2500 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057PDGK ACTIVE MSOP DGK 8 80 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057PDGKG4 ACTIVE MSOP DGK 8 80 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057PDGKR ACTIVE MSOP DGK 8 2500 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057SN ACTIVE SOIC D 8 75 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb Br BQ2057SNTR ACTIVE SOIC D 8 2500 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb Br BQ2057SNTRG4 ACTIVE SOIC D 8 2500 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb Br BQ2057TS ACTIVE TSSOP PW 8 150 Green RoHS amp CUNIPDAU Level 1 260C UNLIM no Sb Br BQ2057TSN ACTIVE SOIC D 8 75 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb Br BQ2057TSNTR ACTIVE SOIC D 8 2500 Green RoHS amp CUNIPDAU Level 1 260C UNLIM no Sb Br Addendum Page 1 Texas PACKAGE OPTION ADDENDUM INSTRUMENTS www ti com 2 Oct 2006 Orderable Device Status Package Package Pins Package Eco Plan Lead Ball Finish MSL Peak Temp Type Drawing Qty BQ2057TSNTRG4 ACTIVE SOIC D 8 2500 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb
9. EVIEW Device has been announced but is not in production Samples may or may not be available OBSOLETE has discontinued the production of the device 2 Eco Plan The planned eco friendly classification Pb Free ROHS Pb Free RoHS Exempt or Green RoHS amp no Sb Br please check http Awww ti com productcontent for the latest availability information and additional product content details TBD The Pb Free Green conversion plan has not been defined Pb Free RoHS TI s terms Lead Free or Pb Free mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances including the requirement that lead not exceed 0 1 by weight in homogeneous materials Where designed to be soldered at high temperatures Pb Free products are suitable for use in specified lead free processes Pb Free ROHS Exempt This component has a RoHS exemption for either 1 lead based flip chip solder bumps used between the die and package or 2 lead based die adhesive used between the die and leadframe The component is otherwise considered Pb Free RoHS compatible as defined above Green RoHS no Sb Br defines Green to mean Pb Free ROHS compatible and free of Bromine Br and Antimony Sb based flame retardants Br or Sb do not exceed 0 1 by weight in homogeneous material 3 MSL Peak Temp The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications and peak sold
10. INFORMATION DC DC R SNS e BAT 4 a bq2057 bq2057 SNS COMP BAT vcc vss TS STAT DC DC _ BAT i Rsns e BAT Figure 5 High Side Current Sensing Figure 6 Low Side Current Sensing voltage regulation phase The voltage regulation feedback is through the BAT pin This input is tied directly to the positive side of the battery pack The bq2057 monitors the battery pack voltage between the BAT and VSS pins The bq2057 is offered in four fixed voltage versions 4 1 V 4 2 V 8 2 V and 8 4 V Other regulation voltages can be achieved by adding a voltage divider between the positive and negative terminals of the battery pack and using bq2057T or bq2057W The voltage divider presents scaled battery pack voltage to BAT input See Figure 7 and Figure 8 The resistor values RB1 and RB2 for the voltage divider are calculated by the following equation V 2 Nx CELL B2 VO REG Where Number of cells in series V CELL Desired regulation voltage per cell 9 INSTRUMENTS www ti com 11 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION DC D 542057 SNS COMP BAT VSS BAT TS STAT I i Figure 7 Optional Voltage Divider for Nonstandard Regulation Voltage High Side Current Sensing charge termination and recharge DC
11. LE OPTIONS PACKAGE Ta CHARGE REGULATION SOIC TSSOP msopt VOLTAGE SN TS DGK Not available bq2057TS bq2057DGK 20 C to 70 C bq2057CSN bq2057CTS q2057CDGK Not available bq2057TTS ae bq2057WSN bq2057WTS 1 Note the difference in pinout for this package Wy TEXAS INSTRUMENTS 2 www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 function block diagram 1 Vcc 9 9 DONE 4 Sleep Mode e e V Control I Control ce COMP Voltage Regulation n e G comp attery 7 1 V Battery Control idi Conditionin Block g oc 1 STAT ts 4 TS2 Trip L 4 1 I Control 95 High Low SNS Set SNS Vcc V sNs We Vss V sNs Current Regulation Charge Termination a VSS vy TEXAS INSTRUMENTS www ti com 3 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 Terminal Functions i wmpsewemu Fo Een E TERMINAL SOIC SN and TSSOP TS DGK 2 7 detailed description curren
12. MAX 0 15 4 250 10 0 05 5 DIM A MAX A MIN 4040064 F 01 97 NOTES A Alllinear dimensions are in millimeters This drawing is subject to change without notice Body dimensions do not include mold flash or protrusion not to exceed 0 15 Falls within JEDEC MO 153 35 TEXAS INSTRUMENTS POST OFFICE BOX 655303 DALLAS TEXAS 75265 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries TI reserve the right to make corrections modifications enhancements improvements and other changes to its products and services at any time and to discontinue any product or service without notice Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete All products are sold subject to terms and conditions of sale supplied at the time of order acknowledgment TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with Tl s standard warranty Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty Except where mandated by government requirements testing of all parameters of each product is not necessarily performed TI assumes no liability for applications assistance or customer product design Customers are responsible for their products and applicat
13. MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION automatic charge rate compensation continued AutoComp setup requires the following information Total impedance of battery pack 2 Maximum charging current The voltage drop across the internal impedance of battery pack 2 can then be calculated using the following equation V Z Z PACK X REG 13 The required compensation is then calculated using the following equations V 14 COMP VO REG 8 V cour Where is the voltage on COMP pin This voltage is referenced VCC in high side current sensing configuration and to VSS for low side sensing is the voltage across the battery pack The values of R coMp1 and can be calculated using the following equation 15 V cOMP um 3 2 2 x e RCOMP1 bq2057 SNS COMP bq2057 SNS COMP BAT cc BAT cc VSS VSS TS STAT 1 8 1 9 RCOMP1 BAT High Side Current Sensing Low Side Current Sensing Figure 13 AutoComp Circuits Wy TEXAS INSTRUMENTS www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION automatic charge rate compensation continued The following example illustrat
14. UCTION DATA information is current as of publication date Products conform to specifications per the terms of Texas Instruments standard warranty Production processing does not necessarily include i testing of all parameters DESCRIPTION The BENCHMARQ bq2057 series advanced Lithium lon Li lon and Lithium Polymer Li Pol linear charge management ICs are designed for cost sensitive and compact portable electronics They combine high accuracy current and voltage regulation battery conditioning temperature monitoring charge termination charge status indication and AutoComp charge rate compensation in a single 8 pin IC MSOP TSSOP and SOIC package options are offered to fit a wide range of end applications The 042057 continuously measures battery temperature using an external thermistor For safety the bq2057 inhibits charge until the battery temperature is within user defined thresholds The bq2057 then charges the battery in three phases conditioning constant current and constant voltage If the battery voltage is below the low voltage threshold V min the bq2057 precharges using a low current to condition the battery The conditioning charge rate is approximately 10 of the regulation current The conditioning current also minimizes heat dissipation in the external pass element during the initial stage of the charge After conditioning the bq2057 applies a constant current to the battery An external sense resistor sets
15. X3 Texas PACKAGE OPTION ADDENDUM INSTRUMENTS www ti com 2 Oct 2006 PACKAGING INFORMATION Orderable Device Status Package Package Pins Package Eco Plan Lead Ball Finish MSL Peak Temp Type Drawing Qty BQ2057CDGK ACTIVE MSOP DGK 8 80 Green RoHS amp CUNIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057CDGKG4 ACTIVE MSOP DGK 8 80 Green RoHS amp CUNIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057CDGKR ACTIVE MSOP DGK 8 2500 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057CDGKRG4 ACTIVE MSOP DGK 8 2500 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057CSN ACTIVE SOIC D 8 75 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb Br BQ2057CSNG4 ACTIVE SOIC D 8 75 Green RoHS amp CUNIPDAU Level 1 260C UNLIM no Sb Br BQ2057CSNTR ACTIVE SOIC D 8 2500 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb Br BQ2057CSNTRG4 ACTIVE SOIC D 8 2500 Green RoHS amp NIPDAU Level 1 260C UNLIM no Sb Br BQ2057CTS ACTIVE TSSOP PW 8 150 Green RoHS amp CUNIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057CTSG4 ACTIVE TSSOP PW 8 150 Green RoHS amp CUNIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057CTSTR ACTIVE TSSOP PW 8 2000 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057CTSTRG4 ACTIVE TSSOP PW 8 2000 Green RoHS amp NIPDAU Level 2 260C 1 YEAR no Sb Br BQ2057DGK ACTIVE MSOP DGK 8 80 Green RoHS amp NIPDAU Level 2 260
16. emperature monitoring continued For PTC Thermistors _ 5 x Ry X 5 i 3 x R Pra S 5x Roy x 6 T2 6 x Ry H7 x Where is the cold temperature resistance and is the hot temperature resistance of thermistor as specified by the thermistor manufacturer R14 or can be omitted If only one temperature hot or cold setting is required Applying a voltage between the V rs1 and V rs2 thresholds to pin TS disables the temperature sensing feature DC _ Rews t Y 542057 692057 SNS COMP SNS COMP BAT cc BAT T vss vec vss TS STAT TS STAT RT ime DC RT2 ll Thermistor e BAT RT2 Thermistor BAT RSNS High Side Current Sensing Low Side Current Sensing Figure 9 Temperature Sensing Circuits Temperature Fault V TS2 Normal Temperature Range V TS1 Temperature Fault 55 Figure 10 642057 TS Input Thresholds vy TEXAS INSTRUMENTS www ti com 13 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION charge inhibit function The TS pin can be used as charge inhibit input The user can inhibit charge by connecting the TS pin to VOC VSS or any level outside the 51 to 2 thresholds Applying a voltage between the V rs1 and V rs2 thresholds to pin TS ret
17. ent STAT pin not to exceed 20 mA Source current STAT pin not to exceed Pp 10 mA Output current CC pin not to exceed Pp 2 40 mA Total power dissipation Pp at 25 C 300mW Operating free air temperature range 209 to 70 C Storage temperature range Tstg sssdesxess 409 to 125 C Lead temperature soldering 10 300 C 1 Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied Exposure to absolute maximum rated conditions for extended periods may affect device reliability DISSIPATION RATING TABLE DERATING FACTOR lt 25 C 70 ABOVE TA 25 POWER RATING POWER RATING DGK 3 4 mW C 424 mW 271 mW PACKAGE recommended operating conditions IT Supply voltage 4 5 15 Operating free air temperature range TA 20 70 electrical characteristics over recommended operating free air temperature range unless otherw
18. er temperature Important Information and Disclaimer The information provided on this page represents TI s knowledge and belief as of the date that it is provided bases its knowledge and belief on information provided by third parties and makes no representation or warranty as to the accuracy of such information Efforts are underway to better integrate information from third parties has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals and suppliers consider certain information to be proprietary and thus CAS numbers and other limited information may not be available for release Addendum Page 2 K Texas PACKAGE OPTION ADDENDUM INSTRUMENTS www ti com 2 Oct 2006 In no event shall TI s liability arising out of such information exceed the total purchase price of the TI part s at issue in this document sold by to Customer on an annual basis Addendum Page 3 MECHANICAL DATA DGK S PDSO G8 PLASTIC SMALL OUTLINE PACKAGE 0 25 15 a Gauge Plane Y 0 Seating a 4073329 05 06 NOTES All linear dimensions are in millimeters B This drawing is subject to change without notice Body length does no
19. es these calculations Assume Z pack 100 500 mA high side current sensing bq2057C V z 4 PACK REG Vig 0 1 x 0 5 V z 50 mV i NR CM COMP 7 T _ 0 05 COMP 22 V COMP 22 7 mV Let 2 10 KQ PcoMP Visus Vicomp R COMP1 gem E 105 mV 22 7 mV 1 10k x 22 7 mV RcoMP1 36 25 Use the closest standard value 36 0 for Rcoyp1 vy TEXAS INSTRUMENTS www ti com 16 17 18 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 MECHANICAL DATA DGK R PDSO G8 PLASTIC SMALL OUTLINE PACKAGE 0 15 NOM t Gage Plane 2 95 Y Seating Plane 015 7 250 10 0 05 4073329 04 98 NOTES Alllinear dimensions in millimeters This drawing is subject to change without notice Body dimensions do not include mold flash or protrusion Falls within JEDEC MO 187 Wy TEXAS INSTRUMENTS 20 www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 MECHANICAL DATA 8 Pin SOIC Narrow SN e T 8 P
20. esponsible or liable for any such statements Following are URLs where you can obtain information on other Texas Instruments products and application solutions Products Applications Amplifiers amplifier ti com Audio www ti com audio Data Converters dataconverter ti com Automotive www ti com automotive DSP dsp ti com Broadband www ti com broadband Interface interface ti com Digital Control www ti com digitalcontrol Logic logic ti com Military www ti com military Power Mgmt power ti com Optical Networking www ti com opticalnetwork Microcontrollers microcontroller ti com Security www ti com security Low Power Wireless www ti com Ipw Telephony www ti com telephony Video amp Imaging www ti com video Wireless www ti com wireless Mailing Address Texas Instruments Post Office Box 655303 Dallas Texas 75265 Copyright 2006 Texas Instruments Incorporated
21. g the initial stage of charge See Figure 3 for a typical charge profile 6 INSTRUMENTS www ti com 3 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION Q1 RSNS 51647500 D1 020 Battery DC pe e 5 i e e BRE I Tm R2 0 1 uF 4 1kQ PACK e L NTC e oo RT2 U2 C1 d 0 1 uF i CMD67 22SRUC GND e T e Figure 4 0 5 A Charger Using P Channel MOSFET current regulation phase The bq2057 regulates current while the battery pack voltage is less than the regulation voltage The bq2057 monitors charge current at the SNS input by the voltage drop across a sense resistor in series with the battery pack In high side current sensing configuration Figure 5 Reus is between the VCC and SNS pins and in low side sensing Figure 6 the is between VSS battery negative and SNS charger ground pins Charge current feedback applied through pin SNS maintains a voltage of across the current sense resistor The following formula calculates the value of the sense resistor V SNS 1 R SNS Where 10 is the desired charging current Wy TEXAS INSTRUMENTS 10 www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION
22. i in TS1 to TS2 Indicate CHARGE Range SUSPEND STAT Hi Z Yes TS Pin in TS1 to TS2 Range V BAT lt V min Yes Terminate Charge Indicate CHARGE I TERM 4 Yee Detected Yes STAT Low Yes Done V BAT lt V RCH No Figure 2 Operation Flowchart Wy TEXAS INSTRUMENTS www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION Preconditioning Current Regulation Voltage Regulation and Charge Phase Phase Termination Phase Regulation Voltage Regulation Current Minimum Charge Voltage Preconditioning and Taper Detect Figure 3 Typical Charge Profile qualification and precharge When power is applied the bq2057 starts a charge cycle if a battery is already present or when a battery is inserted Charge qualification is based on battery temperature and voltage The bq2057 suspends charge if the battery temperature is outside the V rs1 to 2 range and suspends charge until the battery temperature is within the allowed range The bq2057 also checks the battery voltage If the battery voltage is below the precharge threshold V min the bq2057 uses precharge to condition the battery The conditioning charge rate S set at approximately 10 of the regulation current The conditioning current also minimizes heat dissipation in the external pass element durin
23. in SN 0 150 SOIC cid ca Inches Millimeters C C L3 D E c Dimension Min Max Min Max c 0 060 0 070 1 52 1 78 1 0 004 0 010 0 10 0 25 0 013 0 020 0 33 0 51 C 0 007 0 010 0 18 0 25 D 0 185 0 200 4 70 5 08 E 0 150 0 160 3 81 4 06 C A e 0 045 0 055 1 14 1 40 A1 0 225 0 245 5 72 6 22 f 0 015 0 035 0 38 0 89 A 004 L TS 8 Pin TSSOP Inches Millimeters Dimension Min Max Min Max 0 048 1 10 AE H A1 0 002 0 006 0 05 0 15 Q 0 007 0 012 0 18 0 30 C 0 004 0 007 0 09 0 18 L p D 0 114 0 122 2 90 3 10 E 0 169 0 176 4 30 4 48 0 0256BSC 0 65BSC A SEATI HHH ii s H 0 246 0 256 6 25 650 PLANE d Notes 1 Controlling dimension millimeters Inches shown for reference only D and do not include mold flash or protrusions Mold flash or protrusions shall not exceed 0 15 mm per side Each lead centerline shall be located within 0 10 mm of its exact true position A Leads shall be coplanar within 0 08 mm at the seating plane Dimension B does not include dambar protrusion The dambar protrusion s shall not cause the lead width to exceed B maximum by more than 0 08 mm A Dimension applies to the flat section of the lead between 0 10 mm and 0 25 mm from the lead tip is defined as the distance from the seating plane to the lowest point of the package body base plane vy TEXAS INSTRUMENTS www ti com 21
24. ions using TI components To minimize the risks associated with customer products and applications customers should provide adequate design and operating safeguards TI does not warrant or represent that any license either express or implied is granted under any TI patent right copyright mask work right or other TI intellectual property right relating to any combination machine or process in which TI products or services are used Information published by TI regarding third party products or services does not constitute a license from to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual property of the third party or a license from TI under the patents or other intellectual property of TI Reproduction of information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties conditions limitations and notices Reproduction of this information with alteration is an unfair and deceptive business practice TI is not responsible or liable for such altered documentation Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice is not r
25. ise noted PARAMETER TEST CONDITIONS UNIT Current Voc gt VcC min Excluding external loads For bq2057 and bq2957C V BAT gt V BAT 20 8 V For bq2057T and bq2957W V BAT gt V BAT 2 0 8 V Input bias current on BAT V BAT V REG llB SNS Input bias current on SNS pin V SNS 5 V Ivecs Vcc Sleep current 5 Input bias current on TS V TS 25V Do 5 n Input bias current on COMP V COMP fA BATTERY VOLTAGE REGULATION B bq2057C See Notes 1 2 3 4 158 4 20 4 242 utput voltage bq2057T See Notes 1 2 3 8 119 8 20 8 282 bq2057W See Notes 1 2 3 8 317 8 40 8 484 NOTES 1 For high side current sensing configuration 2 Forlow side current sensing configuration the tolerance is 1 for 25 C and 1 2 for 20 C gt TA gt 70 V BAT 40 3 V lt lt VCC max 692057 See Notes 1 2 3 4 059 4 10 4 141 H 35 TEXAS INSTRUMENTS www ti com 5 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 electrical characteristics over recommended operating free air temperature range unless otherwise noted continued PARAMETER TEST CONDITIONS MIN TYP MAX UNIT CURRENT REGULATION 105 125 Current regulation V SNS threshold 110 CHARGE TERMINATION DETECTION Charge termination Voltage at pin SNS relative to for high side
26. nimum beta or needed CMAX 9 min Ip 4 0 035 28 where is the maximum collector current in this case same as and lg is the base current chosen to be 35 mA in this example NOTE The beta of a transistor drops off by a factor of 3 over temperature and also drops off with load Therefore note the beta of device at and the minimum ambient temperature when choosing the device This beta should be larger than the minimum required beta Now choose a PNP transistor that is rated for 215 V lt 78 C W Ic gt 1 5 A Bmin2 28 and that is in SOT223 package vy TEXAS INSTRUMENTS www ti com 15 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION selecting an external pass transistor continued P channel MOSFET Selection steps for a P channel MOSFET Example V 5 5 V 500 mA 4 2 V single cell Li lon bq2057C Vj is the input voltage to the charger and is the desired charge current See Figure 4 1 Determine the maximum power dissipation Pp in the transistor The worst case power dissipation happens when the cell voltage is at its lowest typically 3 V at the beginning of current regulation phase and Vj is at its maximum Where Vp is the forward voltage drop across the reverse blocking diode if one is used and is the voltage drop acros
27. onfiguration The following examples illustrate the design process for either device PNP transistor Selection steps for a PNP bipolar transistor Example 4 5 V 1 4 2 single cell Li lon bq2057C Vi is the input voltage to the charger and is the desired charge current see Figure 1 1 Determine the maximum power dissipation Pp in the transistor The worst case power dissipation happens when the cell voltage is at its lowest typically V at the beginning of current regulation phase and V is at its maximum Where is the voltage drop across the current sense resistor Vi Ves V x IREG 7 4 5 0 1 3 x1A 1 4W Determine the package size needed in order to keep the junction temperature below the manufacturer s recommended value T max Calculate the total theta C W needed 8 Taag JC Pp _ _ 150 40 JC 1 4 78 C W Now choose a device package with a theta at least 10 below this value to account for additional thetas other than the device A SOT223 package for instance has typically a theta of 60 C W Select a collector emitter voltage rating greater than the maximum input voltage A 15 V device will be adequate in this example Select a device that has at least 50 higher drain current rating than the desired charge current Using the following equation calculate the mi
28. s the current sense resistor Vi Vp Vics REG n Pp 5 5 0 4 0 1 3 x 0 5 A Pp 1W Determine the package size needed in order to keep the junction temperature below the manufacturer s recommended value Calculate the total theta C W needed 11 loeum T maxi TAtmas JC Pp _ _ 150 40 1 110 C W Now choose a device package with a theta least 10 below this value to account for additional thetas other than the device A TSSOP 8 package for instance has typically a theta of 70 C W Select a drain source voltage V ps rating greater than the maximum input voltage 12 V device will be adequate in this example Select a device that has at least 50 higher drain current Ip rating than the desired charge current Verify that the available drive is large enough to supply the desired charge current V Gs Vp V cs VI 12 Vias 0 4 0 1 1 5 5 5 V GS 3 5 Where V GS is the gate to source voltage Vp is the forward voltage drop across the reverse blocking diode if one is used and is the voltage drop across the current sense resistor and Vo is the CC pin output low voltage specification for the bq2057 Select a MOSFET with gate threshold voltage rating less than the calculated Now choose a P channel MOSFET transistor that is rated for VDS lt 15 V lt 110
29. t include mold flash protrusions or gate burrs Mold flash protrusions or gate burrs shall not exceed 0 15 per end gt Body width does not include interlead flash Interlead flash shall not exceed 0 50 per side E Falls within 0 187 variation AA except interlead flash 3 TEXAS INSTRUMENTS www ti com MECHANICAL DATA D R PDSO G8 PLASTIC SMALL OUTLINE PACKAGE Pin 1 Index Area 0 020 0 51 0 012 0 31 0 010 0 25 4 0 050 1 27 Y 0 25 0 069 1 75 Max 0 004 0 10 C 0 004 0 10 Gauge Plane Seating Plane 0 010 0 25 4040047 2 F 07 2004 NOTES All linear dimensions are in inches millimeters This drawing is subject to change without notice Body dimensions do not include mold flash or protrusion not to exceed 0 006 0 15 Falls within JEDEC 5 012 variation AA 35 TEXAS INSTRUMENTS www ti com MECHANICAL DATA MTSS001C JANUARY 1995 REVISED FEBRUARY 1999 PW R PDSO G PLASTIC SMALL OUTLINE PACKAGE 14 PINS SHOWN 0 15 NOM i 1 a Seating Plane tL EA 20
30. t sense input Battery current is sensed via the voltage developed on this pin by an external sense resistor The external resistor can be placed on either the high or low side of the battery See schematics for details battery voltage input Voltage sense input tied directly to the positive side of the battery temperature sense input Input for an external battery temperature monitoring circuit Connecting this input to VCC 2 disables this feature charge status output 3 state indication of charge in progress charge complete and temperature fault or sleep mode charge control output Source follower output that drives an external pass transistor PNP or P channel MOSFET for current and voltage regulation charge rate compensation input Sets the charge rate compensation level The voltage regulation output may be programmed to vary as a function of the charge current delivered to the battery supply voltage input Power supply input and current reference for high side sensing configuration Wy TEXAS INSTRUMENTS 4 www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 absolute maximum ratings over operating free air temperature unless otherwise Supply voltage Vcc with respect to 0 3 to 18 V Input voltage SNS BAT TS COMP all with respect to 0 3 Vcc 0 3 V Sink curr
31. urns the charger to normal operation charge status indication The bq2057 reports the status of the charger on the 3 state STAT pin The following table summarized the operation of the STAT pin CONDITION STAT PIN Battery conditioning and charging Charge complete Done Low Temperature fault or sleep mode The STAT pin can be used to drive a single LED Figure 1 dual chip LEDs Figure 4 or for interface to a host or system processor Figure 11 When interfacing the bq2057 to a processor the user can use an output port as shown in Figure 11 to recognize the high Z state of the STAT pin In this configuration the user needs to read the input pin toggle the output port and read the STAT pin again In a high Z condition the input port always matches the signal level on the output port Host bq2057CTS Processor Figure 11 Interfacing the bq2057 to a Host Processor low power sleep mode The bq2057 enters the sleep mode if the VCC falls below the voltage at the BAT input This feature prevents draining the battery pack during the absence of VCC Wy TEXAS INSTRUMENTS www ti com 042057 bq2057C bq2057T bq2057W SLUSO25F MAY 2001 REVISED JULY 2002 APPLICATION INFORMATION selecting an external pass transistor The bq2057 is designed to work with both PNP transistor and P channel MOSFET The device should be chosen to handle the required power dissipation given the circuit parameters PCB layout and heat sink c
32. y pack The AutoComp feature is disabled by connecting the COMP pin to VOC in high side current sensing configuration and to VSS in low side current sensing configuration The COMP pin must not be left floating Figure 12 outlines the major components of a single cell Li lon battery pack The Li lon battery pack consists of a cell protection circuit fuse connector current sense resistors and some wiring Each of these components contains some resistance Total impedance of the battery pack is the sum of the minimum resistances of all battery pack components Using the minimum resistance values reduces the odds for overcompensating Overcompensating may activate the safety circuit of the battery pack ee Wire lt OO Terminal ea sed Protection Controller E Wire Wire Wire d Terminal Discharge Charge ea J Figure 12 Typical Components of Single Cell Li lon Pack Compensation is achieved through input pin COMP Figure 13 A portion of the current sense voltage presented through this pin is scaled by a factor of and summed with the regulation threshold Vo REG This process increases the output voltage to compensate for the battery pack s internal impedance and for undesired voltage drops in the circuit vy TEXAS INSTRUMENTS www ti com 17 042057 bq2057C bq2057T bq2057W SLUSO25F

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