TEXAS INSTRUMENTS bq2002D/T NiCd/NiMH Fast-Charge Management ICs Manual
Contents
1. 56 B1 0 055 0 065 1 40 1 65 a A p gt Bt C 0 008 0 013 0 20 0 33 L i D 0 350 0 380 8 89 9 65 E 0 300 0325 7 62 8 26 a C bi El 0 230 0 280 5 84 7 11 Foo j e 0 300 0 370 7 62 9 40 _ oL S F B G 0 090 0110 229 2 79 I Mis 8 L 0 115 0 150 2 92 3 81 S 0 020 0 040 0 51 1 02 8 Pin SOIC Narrow SN o 8 Pin SN 0 150 SOIC I i i i ai Inches Millimeters l 1 cn Dimension Min Max Min Max A B d Lo A 0 060 0 070 1 52 1 78 Al 0 004 0 010 010 0 25 E B 0 013 0 020 0 33 0 51 H 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 A e 0 045 0 055 1 14 1 40 c A1 i H 0 225 0 245 5 72 6 22 i i L 0 015 0 035 0 38 0 89 10 bq2002D T Data Sheet Revision History Change No Page No Description 1 3 Was Table 1 gave the bq2002D T Operational Summary Is Figure 2 gives the bq2002D T Operational Summary Nature of Change Changed table to figure Added column and val made Table 1 consistent with Selection Guide 1 5 Added top off values Ves 2 All Revised and expanded this data sheet 3 All Revised and included bq2002D Addition of device 4 Specified package information for the bq2002D 5 1 5 Corrected transposed rows in Selection Guide Table and Notes Change 1 Sept 1996 B changes from Aug 1994 Ordering Information bg2002 Packa2. by averaging together 16 measure ments taken 57us apart The resulting sample period 18 18ms filters out harmonics around 55Hz This tech bq2002D T Voc 0 Fast Charging Top Off Pulse Trickle Fast Charging optional optional bq2002T only bq2002T only CC Output p 286us lc 2861S Mm initiated by application of power Charge initiated by battery replacement It 4576us Table 1 LED TD2002F1 eps Figure 5 Charge Cycle Phases nigue minimizes the effect of any AC line ripple that may feed through the power supply from either 50Hz or 60Hz AC sources Tolerance on all timing is 2090 Maximum Voltage Temperature and Time Any time the voltage on the BAT pin exceeds the maxi mum cell voltage VMcv fast charge or optional top off chargeis terminated Maximum temperature termination occurs anytime the voltage on the TS pin falls below the temperature cut off threshold Vtco where Vrco 0 225 Vcc 5 Maximum charge time is configured using the TM pin Time settings are available for corresponding charge rates of C 4 1C and 2C Maximum time out termina tion is enforced on the fast charge phase then reset and Table 1 Fast Charge Safety Time Top Off Table Typical Fast Charge and Top Off Pulse Corresponding Time Limits Top Off Pulse Trickle Part No Fast Charge Rate TM minutes Rate Trickle Rate Period m
3. operating current is reduced to less than luA in this mode When Vegart returns to a value below Vpp the IC pulsetrickle charges until the next new charge cycle begins Absolute Maximum Ratings bq2002D T Symbol Parameter Minimum Maximum Unit Notes Vcc Vcc relative to Vss 0 3 7 0 V Vr HS 03 0 y Topr Operating ambient temperature 0 70 SC Commercial TsrG Storage temperature 40 85 9c TsoLpER Soldering temperature 260 C 10s max TBIAS Temperature under bias 40 85 ES Note Permanent device damage may occur if Absolute Maximum Ratings are exceeded Functional opera DC Thresholds ta 0 to 70 C VCC 20 tion should be limited to the Recommended DC Operating Conditions detailed in this data sheet Expo sure to conditions beyond the operational limits for extended periods of time may affect device reliability Symbol Parameter Rating Tolerance Unit Notes Vrco Temperature cutoff 0 225 x Vcc 5 V Vrs ee terminates fast charge VHTF High temperature fault 0 25 Vcc 5 V Vrs lt Vutr inhibits fast charge start VLTF Low temperature fault 0 4 Vcc 5 V oan bits fast charge start VMcv Maximum cell voltage 2 45 v a inhibits terminates fast bq2002D T Recommended DC Operating Conditions Ta o to 70 C Symbol Condition Minimum Typical Maximum Unit Notes Vcc Supp
4. Benchmarg Products e from Texas Instruments NiCd NiMH Fast Charge Management ICs Features gt Fast charge of nickel cadmium or nickel metal hydride batter ies Direct LED output displays charge status Fast charge termination by rate of rise of temperature maximum voltage maximum temperature and maximum time Internal band gap voltage ref erence Optional top off charge bq2002T only Selectable pulse trickle charge rates bq2002T only Low power mode 8 pin 300 mil DIP or 150 mil SOIC General Description The bq2002D T Fast Charge IC are low cost CMOS battery charge control lers able to provide reliable charge ter mination for both NiCd and NiMH bat tery applications Controlling a current limited or constant current supply allows the bq2002D T to be the basis for a cost effective stand alone or system integrated charger The bg2002D T integrates fast charge with optional top off and pulsed trickle con trol in a single IC for charging one or moreNiCd or NiMH battery cells Fast charge is initiated on application of the charging supply or battery re placement For safety fast charge is inhibited if the battery temperature and voltage are outside configured limits bq2002D T Fast charge is terminated by any of the following m Rateoftemperaturerise m Maximum voltage m Maximumtemperature m Maximumtime After fast charge the bg2002T option ally tops off and pulsetrickles the batter
5. age too High VBAT lt 2V Battery Temperature VBAT lt 2V and VTS gt 0 25V VCC VBAT gt 2V Chip on Voc 4 0V VTS gt 0 25V VCC VTS lt 0 25V VCC Charge Pending VBAT 2V AT At or VBAT gt 2V or VTS lt 0 25V Vcc or Maximum Time Out VBAT7 2V SD2002D eps Figure 2 bg2002D State Diagram Chip on Battery Voltage Voc 4 0V too High VBAT lt 2V 0 25 Voc lt VTS lt 0 6 VCC Battery Temperature VBAT gt 2V VTS 0 6 VCC or VTS lt 0 25 VCC Charge Pending AT At or Maximum Time Out Trickle and TM High LED Low VBAT lt 2V and VTS lt 0 6 Vcc and VBAT gt 2V VBAT gt 2V or VTS gt 0 25 VCC VTS lt 0 225 VCC or AT At or Maximum Time Out and TM High VBAT 2V VBAT 2V or VTS lt 0 225 VCC or Maximum Time Out SD2002T eps Figure 3 bg2002T State Diagram bq2002D T Clock Phase Generator TM Timing Control INH Voltage Reference Charge Control State Machine AtoD Converter Power On Reset Bd2002TD eps Figure 4 Block Diagram Note This resistor divider network input impedance to end to end should be at least 200kQ and less than 1 MO A ground referenced negative temperature coefficient ther mistor placed in proximity to the battery may be used a
6. ge Option PN 8 pin plastic DIP SN 8 pin narrow SOI C Device D bq2002D Fast ChargelC T bq2002T F ast Chargel C bg2002D is only available in the 8 pin narrow SOIC package 11 K Texas PACKAGE OPTION ADDENDUM INSTRUMENTS www ti com 16 Mar 2007 PACKAGING INFORMATION Orderable Device Status Package Package Pins Package Eco Plan Lead Ball Finish MSL Peak Temp Type Drawing Qty BQ2002DSN ACTIVE SOIC D 8 75 Green RoHS amp CUNIPDAU _ Level 1 260C UNLIM no Sb Br BQ2002DSNG4 ACTIVE SOIC D 8 75 Green RoHS amp CU NIPDAU _ Level 1 260C UNLIM no Sb Br BQ2002DSNTR ACTIVE SOIC D 8 2500 Green RoHS amp CU NIPDAU _ Level 1 260C UNLIM no Sb Br BQ2002DSNTRG4 ACTIVE SOIC D 8 2500 Green RoHS amp CU NIPDAU _ Level 1 260C UNLIM no Sb Br BQ2002TPN ACTIVE PDIP P 8 50 Pb Free CU NIPDAU N A for Pkg Type RoHS BQ2002TPNE4 ACTIVE PDIP P 8 50 Pb Free CU NIPDAU N A for Pkg Type RoHS BQ2002TSN ACTIVE SOIC D 8 75 Green RoHS amp CUNIPDAU _ Level 1 260C UNLIM no Sb Br BQ2002TSNG4 ACTIVE SOIC D 8 75 Green RoHS amp CUNIPDAU _ Level 1 260C UNLIM no Sb Br BQ2002TSNTR ACTIVE SOIC D 8 2500 Green RoHS amp CU NIPDAU _ Level 1 260C UNLIM no Sb Br BQ2002TSNTRG4 ACTIVE SOIC D 8 2500 Green RoHS amp CU NIPDAU _ Level 1 260C UNLIM no Sb Br The marketing status values are defined as follows ACTIVE Product device recommended for new designs LIFEBUY TI has announced that
7. his results in a trickle rate of C 256 for thetop off enabled mode and C 128 otherwise TM Pin The TM pin is a threelevel pin used to select the charge timer top off voltage termination mode trickle rate and voltage hold off period options Table 1 describes the states selected by the TM pin The mid level selection input is developed by a resistor divider between Vcc and ground that fixes the voltage on TM at Vcc 2 0 5V SeeFigure5 Charge Status Indication In the fast charge and charge pending states and when ever the inhibit pin is active the LED pin goes low The LED pin is driven to the high Z state for all other condi tions Figure 3 outlines the state of the LED pin during charge Charge Inhibit Fast charge and top off may be inhibited by using the INH pin When high INH suspends all fast charge and top off activity and the internal charge timer INH freezes the current state of LED until inhibit is re moved Temperature monitoring is not affected by the INH pin During charge inhibit the bg2002D T contin ues to pulsetrickle charge the battery per the TM selec tion When INH returns low charge control and the charge timer resume from the point where INH became active TheVrs sample history is cleared by INH Low Power Mode The IC enters a low power state when Vegart is driven above the power down threshold Vpp where Vpp Vcc 1V 0 5V Both the CC pin and the LED pin are driven to the high Z state The
8. ly voltage 4 0 5 0 6 0 V VBAT Battery input 0 Vcc V VTS Thermistor input 0 5 Vcc V Vrs lt 0 5V prohibited Logic input high 0 5 V INH Vin Logic input high Vcc 0 5 V TM Vim Logic input mid Yee o5 Tec 05 V TM Logic input low 0 1 V INH VIL Logic input low 0 5 V TM VoL Logic output low 0 8 V LED CC lot 10mA Vsaar 2 Vpp Max powers VPD Power down Vec 1 5 Vcc 0 5 V wi A R normal operation lec Supply current 500 uA e aii IsB Standby current 1 uA Vcc 5 1V Vaat VPp lot LED CC sink 10 mA VoL Vss 0 8V IL Input leakage El uA INH CC V Vss to Vcc Note All voltages relative to Vss bq2002D T Impedance Symbol Parameter Minimum Typical Maximum Unit RBAT Battery input impedance 50 MQ Rts TS input impedance 50 MQ Timing Ta 0 to 70 C Vcc 10 Symbol Parameter Minimum Typical Maximum Unit Notes drcv Time base variation 20 20 Note Typical is at Ta 25 C Vcc 5 0V bq2002D T 8 Pin DIP PN 8 Pin PN 0 300 DIP 4 7 k Inches Millimeters g m Dimension Min Max Min Max a bs A 0 160 0 180 4 06 4 57 Al 0 015 0 040 0 38 1 02 M B 0 015 0 022 0 38 0
9. mistor Supply voltage input 5 0V 20 power input Charge inhibit input When high INH suspends the fast charge in progress When returned low the IC re sumes operation at the point where initially suspended cc Charge control output An open drain output used to control the charging current to the battery CC switch ing to high impedance Z enables charging current to flow and low to inhibit charging current CC is modulated to provide top off if enabled and pulse trickle Functional Description Figures 2 and 3 show state diagrams of bq2002D T and Figure 4 shows the block diagram of the bq2002D T Battery Voltage and Temperature Measurements Battery voltage and temperature are monitored for maximum allowable values The voltage presented on the battery sense input BAT should represent a single cell potential for the battery under charge A resistor divider ratio of RB1 N 1 RB2 is recommended to maintain the battery voltage within the valid range where N is the number of cells RB1 is the resistor connected to the positive battery terminal and RB2 is the resistor connected to the negative bat tery terminal SeeFigure1 BAT bq2002D T BAT pin connection Mid level setting for TM NTC negative temperature coefficient thermistor Thermistor connection F2002DT1 eps Figure 1 Voltage and Temperature Monitoring and TM Pin Configuration bq2002D T Battery Volt
10. mony 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 solder 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 TI 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 TI 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 TI and TI suppliers consider certain information to be proprietary and thus CAS numbers and other limited information may not be available for release 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 TI to Customer on an annual basis Addendum Page 1
11. s C 4 Mid 440 None None None bq2002D TC Low 110 None None None 2C High 55 None None None C 4 Mid 320 C 64 C 256 18 3 bq2002T 1C Low 80 C 16 C 256 731 2C High 40 None C 128 73 1 Notes Typical conditions 25 C Vcc 5 0V Mid 0 5 Vcc 0 5V Tolerance on all timing is 20 bq2002D T enforced again on the top off phase if selected bg2002T only There is no time limit on the trickle charge phase Top off Charge bg2002T Only An optional top off charge phase may be selected to follow fast charge termination for 1C and C 4 rates This phase may be necessary on NiMH or other bat tery chemistries that have a tendency to terminate charge prior to reaching full capacity With top off en abled charging continues at a reduced rate after fast charge termination for a period of time selected by the TM pin See Table 1 During top off the CC pin is modulated at a duty cycle of 286us active for every 4290us inactive This modulation results in an averagerate 1 16th that of the fast chargerate Maxi mum voltage time and temperature are the only ter mination methods enabled during top off Pulse Trickle Charge bg2002T Only Pulse trickle is used to compensate for self discharge while the battery is idle in the charger The battery is pulse trickle charged by driving the CC pin active for a period of 286us for every 72 9ms of inactivity for 1C and 2C selections and 286us for every 17 9ms of inactivity for C 4 selection T
12. s a low cost temperature to voltage transducer The tempera ture sense voltage input at TS is developed using a resistor thermistor network between Vcc and Vss See Figure 1 Starting A Charge Cycle Either of two events starts a charge cycle see Figure 5 1 Application of power toVcc or 2 Voltage at the BAT pin falling through the maximum cell voltage where VMcv 2V 5 If the battery is within the configured temperature and voltage limits the IC begins fast charge The valid bat tery voltage range is Vgat lt Vmcv The valid tempera ture range is Vutr lt Vts lt V ite for the bg2002T and Vutr lt Vrs for the bq2002D where Vitr 0 4 Vcc 2590 VHrr 0 25 Vcc 5 bg2002T only If the battery voltage or temperature is outside of these limits the IC pulse trickle charges until the tempera ture falls within the allowed fast charge range or a new charge cycleis started Fast charge continues until termination by one or more of the four possible termination conditions m Rateoftemperaturerise m Maximum voltage m Maximumtemperature m Maximum time T tTermination The bg2002D T samples at the voltage at the TS pin ev ery 19s and compares it to the value measured three samples earlier If the voltage has fallen 25 6mV or more fast charge is terminated The AT At termination test is valid only when Vrco lt Vrs lt V itr for the bg2002T and Vrco lt Vrs for thebg2002D Temperature Sampling A sample is taken
13. 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 TI does not recommend using this part in a new design PREVIEW Device has been announced but is not in production Samples may or may not be available OBSOLETE TI 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 www 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 reguirement that lead not exceed 0 196 by weight in homogeneous materials Where designed to be soldered at high temperatures TI 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 amp no Sb Br TI defines Green to mean Pb Free RoHS compatible and free of Bromine Br and Anti
14. y per the pre configured limits Fast charge may be inhibited using the INH pin The bq2002D T may be placed in low standby power mode to reduce system power consumption Pin Connections Pin Names TM Timer mode select input TS Temperature sense input LED Charging status output Vcc Supply voltage input BAT Battery voltage input INH Charge inhibit input Vss System ground CC Charge control output 8 Pin DIP or Narrow SOIC bq2002D T Selection Guide Part No TCO HTF LTF Fast Charge _ _Time Out Top Off Maintenance C 4 440 min None None bq2002D 0 225 Vcc 0 25 Vcc None 1C 110 min None None 2C 55 min None None C 4 320 min C 64 C 256 bq2002T 0 225 Vcc 0 25 Vcc 0 4 Vcc IC 80 min C 16 C 256 2C 40 min None C 128 SLUS133B JULY 2000 bq2002D T Pin Descriptions BAT Vss TS Vcc INH Timer modeinput A threelevel input that controls the settings for the fast charge safety timer voltage ter mination mode top off pulse trickle and voltage hol d off time Charging output status Open drain output that indicates the charging status Battery input voltage The battery voltage sense input The input to this pin is created by a high impedance re sistor divider network connected between the positive and negative terminals of the battery System ground Temperature sense input Input for an external battery temperature monitoring ther
Download Pdf Manuals
Related Search
TEXAS INSTRUMENTS bq2002D/T NiCd/NiMH Fast Charge Management ICs Manual