LINEAR TECHNOLOGY LT6650 Manual
Contents
1. 1000 1000 1000 lour OWA lour 40uA lour OWA Rz 0Q a Rz 00 CL Rz 100us iuF 8 C 10uF 8 8 100 C 100 100 2 C 10uF 4 E 5 5 L NIC 1 5 m Lu M 10uF z z C 47uF 5 5 5 5 10 C 47uF a 10 a 10 2 2 2 C 47uF 1 1 1 10 100 1k 10k 100k 10 100 1k 10k 100k 10 100 1k 10k 100k FREQUENCY Hz FREQUENCY Hz FREQUENCY Hz 6650 G19 6650 G20 6650 G21 Power Supply Rejection Ratio vs Power Supply Rejection Ratio vs Power Supply Rejection Ratio vs Frequency Frequency Frequency 20 20 20 p lout OHA zu lout 400A lout OWA amp 10 00 amp 10 00 amp 10 Rz 100us2. 120 120 100 100 80 80 n Wh PHASE gt 40 40 m 20 20 0 It 25 C 0 UNITY GAIN 21 RL 2k 20 C 1uF 40 LZE 40 0 01 0 1 1 10 100 FREQUENCY kHz 6650 G15 Integrated Noise 10Hz to 1kHz 100 Vin 5V CL 1 s lout 2004A gt 2 2 10 ea lt oO z 1 10 100 1k FREQUENCY Hz 6650 618 6650fa LT6650 TYPICAL PERFORMANCE CHARACTERISTICS see applications Figure 1 Output Impedance vs Frequency Output Impedance vs Frequency Output Impedance vs Frequency
3. 2 4 6 8 10 12 14 16 18 INPUT VOLTAGE V 6550 G05 Load Regulation Sinking TYPICAL PART 5 OUTPUT CURRENT uA 6650 G08 1000 OUTPUT VOLTAGE mV SUPPLY CURRENT uA INPUT OUTPUT VOLTAGE mV 0 2 4 6 8 10 12 14 16 18 20 NPUT VOLTAGE V 6650 603 Line Regulation 404 403 402 401 Ta 55 C 400 399 398 0 8 1 0 1 2 1 4 1 6 1 8 2 0 INPUT VOLTAGE V 6650 G06 Minimum Input Output Voltage Ditferential Sourcing 300 Vour 1 425V 100k 39 2 0 1 Voy 400 125 C 300 25 C 200 55 C 100 0 10 100 1000 Supply Current vs Input Voltage OUTPUT CURRENT uA 6650 G09 LT6650 TYPICAL PERFORMANCE CHARACTERISTICS see applications Figure 1 Minimum Input Output Voltage Differential Sinking 0 Vout 1 425V TYP 100k RG 39 2k 0 1 Voy 100 55 C lt 200 gt E fa a 300 2590 2 e p 2 55 400 ee ne ae DO ee a 125 C 500 10 100 OUTPUT 1000 6650 610 FB Pin Current vs FB Pin Voltage VFB CURRENT IS POSITIVE WHEN
4. gt 2 C 10uF 5 gp 2 CL uF 0 CSH _10 10uF 1pF _ 0 47uF _ 0 5 5 b 5 pF 20 p 20 20 t D D ui 30 d 30 d 30 gt 40 gt 40 gt 40 8 50 50 50 zi C 47uF E a 47uF ec 60 ec 60 ec 60 z z 70 70 70 80 80 80 10 100 1k 10k 100k 10 100 1k 10k 100k 10 100 1k 10k 100k FREQUENCY Hz FREQUENCY Hz FREQUENCY Hz 6650 G22 6650 G23 6650 G24 Power Supply Rejection Ratio vs Power Supply Rejection Ratio vs Power Supply Rejection Ratio vs Frequency Frequency Frequency 20 20 20 m lout OuA a lout 40uA EN lout OuA amp 10 00 8 10 00 8 10 FCL e Rz 100 5 0 0 0 Rin 1k Rin Rin 1 10 HH 10 c 10 5 10uF 20 1pF E 20 10uF 20 10uF 5 30 30 30 Die uF gt 40 2 40 C 27 40 S 50 50 C A7uF 50 a 47uF ec 60 A7uF 60 ec 60 L J 5 70 5 70 70 80 80 80 10 100 1k 10k 100k 10 100 1k 10k 100k 10 100 1k 10k 100k FREQUENCY Hz FREQUENCY Hz FREQUENCY Hz 6650 G25 6650 G26 6650 G27 LT6650 PIN FUNCTIONS FB Pin 1 Resistor Divider Feedback Pin Connect a resistor divider from OUT to GND and the center tap to FB This pin sets the output potential GND Pin 2 Ground Connection DNC Pin3 Do not
5. TO 25 C NUMBER OF UNITS 0 400 200 200 400 600 DISTRIBUTION ppm 6650 F11 Figure 11 Worst Case 0 to 70 C Hysteresis the parts cycled over the higher temperature extremes exhibit a broader hysteresis distribution The worst hys teresis measurements indicate voltage shifts of less than 1000ppm 0 1 from their initial value Limits of Operation The LT6650 is a robust bipolar technology part ESD clamp diodes are integrated into the design and are depicted in the Simplified Schematic for reference Diodes are included between the GND pin and the IN OUT and FB pins to prevent reverse voltage stress on the device Unusual modes of operation that forward bias any these diodes should limit current to 10mA to avoid permanent damage to the device The LT6650 is fabricated using a relatively high voltage process allowing any pin to inde pendently operate at up to 20V with respect to GND The part does not include any over voltage protection mecha nisms therefore caution should be exercised to avoid inadvertent application of higher voltages in circuits in volving high potentials LIGHT COLUMNS 40 25 C DARK COLUMNS 85 TO 25 NUMBER OF UNITS 1000 750 500 250 0 250 500 750 1000 DISTRIBUTION ppm 6650 F12 Figure 12 Worst Case 40 C
6. to the square of the temperature change Note 10 Temperature coefficient is measured by dividing the change in output voltage by the specified temperature range Note 11 This feature guarantees the shunt mode operation of the device 6650fa 3 16650 TYPICAL PERFORMANCE CHARACTERISTICS see applications Figure 1 Output Voltage Temperature Drift 1e TYPICAL PART 403 402 401 400 399 OUTPUT VOLTAGE mV 398 397 396 60 40 20 0 20 40 60 80 100 120 TEMPERATURE C 6650 601 Supply Current vs Input Voltage 10 8 125 C 25 C 4 55 C SUPPLY CURRENT uA 0 0 02 04 0 66 0 8 1 0 12 14 1 6 1 8 2 0 INPUT VOLTAGE V 6650 G04 Load Regulation Sourcing PART 5V 171 25 C 125 C T 55 C OUTPUT VOLTAGE CHANGE uV 10 100 OUTPUT CURRENT uA 6650 607 1000 OUTPUT VOLTAGE mV OUTPUT VOLTAGE CHANGE uV OUTPUT VOLTAGE mV 403 402 401 400 399 398 60 40 20 0 A D A N 1000 10 100 Output Voltage Temperature Drift THREE PARTS Vin 5V 20 40 60 80 100 120 TEMPERATURE C 6650 G02 Line Regulation Ta 125 C
7. 33k 22uF 6650 02 0 2ms DIV 6650 F03 Figure 3 LT6650 Turn On Characteristic the same circuit responding to input transients of 0 5V settling in about 0 3ms Figures 5 through 7 show the same Circuit responding to various load steps changes between 100uA in Figure 5 sourcing current step be tween 100 and 200uA in Figure 6 and sinking current 2ms DIV 6650 F04 Figure 4 Output Response to 0 5V Input Step Vout 10mV DIV SINKING SOURCING lour 1001A SINKING 10044 SOURCING 6650 F05 Figure 5 Output Response to Bidirectional Load Step 100uA to 1001A 10mV DIV AC lour 100A 200pA D 6650 F06 Figure 6 Output Response to Current Sourcing Load Step 100uA to 200uA 6650fa LT6650 APPLICATIONS INFORMATION step between 100pA and 200pA in Figure 7 Load step settling occurs in about 0 5ms or less to 30 276 Output Adjustment Ifthe LT6650 is to be used as a 400mV reference then the output and feedback pins may be tied together without any scale setting components as shown in the front page application circuit Setting the output to any higher voltage is a simple matter of selecting two feedback resistors to configurethe non inverting gain ofthe internal operational amplifier as shown in Figure 8 A feedback resistor Rr is connected between the OUT pin and the FB pin and a gain resistor Rg is connected
8. IT ENTERS THE DEVICE 125 C A O o FB CURRENT nA 0 0 6 0 4 0 2 0 02 04 06 08 10 FB PIN VOLTAGE V Output Noise 0 1Hz to 10Hz Vin 5V 6650 G13 OUTPUT NOISE 5uV DIV 6650 G16 OUTPUT CURRENT mA 10 FB PIN CURRENT nA k 0 01 NOISE LEVEL uV VHZ Output Short Circuit Current vs Input Voltage OUTPUT SHORTED TO GND 12596 2596 4 E e 0 2 4 6 8 10 12 14 16 18 20 NPUT VOLTAGE V FB Pin Current vs FB Pin Voltage 6650 G11 FB PIN VOLTAGE V Vout CURRENT IS POSITIVE WHEN IT ENTERS THE DEVICE 125 C 25 C 55 C 1 3 5 7 9 11 13 15 17 19 6650 G14 Output Voltage Noise Spectrum 20 C luF 15 10 lout OWA lour 2004A 5 0 10 100 1k 10k FREQUENCY Hz 6650 G17 OUTPUT CURRENT mA Output Short Circuit Input Voltage Current vs OUTPUT SHORTED TO Vin 25 0 2 4 6 8 10 NPUT VOLTAGE V 12 14 16 18 20 6650 G12 Gain and Phase vs Frequency
9. Micropower Zener 2 Terminal Reference CATHODE CATHODE GND Vz 0 4V 1 Re Re M n ANODE ANODE 6650 TA02 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1790 Micropower LDO Precision Reference 0 05 Max Sources Sinks Current Available in SOT 23 LT1460 Micropower Precision Reference 0 075 Max 10ppm C Available SOT 23 LT1461 Micropower LDO Low TC Precision Reference 0 04 Max 3ppm C 35uA Supply Current LT1494 LT1495 Single Dual Quad Micropower Op Amps 1 5uA Vos lt 375uV lt 1000pA LT1496 LTC1540 Nanopower Comparator with Reference 300nA Available in 3mm x 3mm DFN Package LTC1798 Micropower LDO Reference 0 15 Max 6 5uA Supply Current LT6700 Micropower Dual Comparator with Reference 6 5uA Choice of Polarities Available SOT 23 6650fa Linear Technology Corporation rwr NEAR 1630 McCarthy Blvd Milpitas CA 95035 7417 Lae tates 408 432 1900 FAX 408 434 0507 e www linear com LINEAR TECHNOLOGY CORPORATION 2003
10. N i D LT6650 TECHNOLOGY Micropower 400mV Reference with Rail to Rail Buffer Amplifier in SOT 23 FEATURES DESCRIPTION Low Quiescent Current 5 6LA typical LT 6650 is a micropower low voltage 400mV refer Wide Supply Range 1 4V to 18V ence Operating with supplies from 1 4V up to 18V the 400mV Reference 1 Maximum Accuracy Over device draws only 5 typical making it ideal for low Temperature at 5V voltage systems as well as handheld instruments and Rail to Rail Buffer Amplifier industrial control systems With only two resistors the 0 5 400mV Maximum Initial Accuracy at 5V internal buffer amplifier can scale the 400mV reference to m Shunt Configurable any desired value up to the supply voltage Sinks and Sources Current PT Wie ona Range A 01266 e Externally Adjustable Output Voltage Bes tem 1 ower dissipation is 28uW Low Profile 1mm 5 lead SOT 23 e ThinSOT Package Stability is ensured with any output capacitor of 1uF or higher APPLICATIONS The LT6650 is the lowest voltage series reference available in the 5 lead SOT 23 package 2 4X LTC and LT istered trademarks of Linear Technology C ion m Battery Operated Systems TRIRSOT isa trademark of Linear Technology o T RR m Handheld Instruments All other trademarks are the property of their respective owners m ndustrial Control Systems ata Acquisition Systems Negative Volta
11. connect Connected internally for post package trim This pin must be left unconnected IN Pin 4 Positive Supply Bypassing with a 1 capacitor is recommended if the output loading changes OUT Pin 5 Reference Output The output sources and sinks current It is stable with any load capacitor with a total capacitance of 1uF or more Higher load capacitance improves load transient response BLOCK DIAGRAM IN 4 Vp 400mV REFERENCE OUT DNC GND Lal 6650 BD FB APPLICATIONS INFORMATION Long Battery Life The LT6650 is a micropower adjustable reference which operates from supply voltages ranging from 1 4V to 18V The series regulated output may be configured with exter nal resistors to any voltage from 400mV to nearly the supply potential Under no load conditions the LT6650 dissipates only 8uW when operating on a 1 4V supply Other operating configurations allow the LT6650 to be used aS a micropower positive or negative adjustable shunt reference from 1 4V to 18V Bypass and Load Capacitor The LT6650 voltage reference requires 1uF or greater output capacitance for proper operation This capacitance may be provided by either a single capacitor connected between OUT and GND or formed by the aggregate of several capacitors that may be serving other decoupling functions Output impedance can be reduced by DC load ing of the output by 40uA to 200uA and or adding an Rz to the output capacitor fo
12. ess otherwise noted SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Tc Output Voltage Temperature e 30 ppm C Coefficient Note 10 AVpo Dropout Voltage Note 7 Referred to Viy 1 8V Voyr 1 4V Rr 100k Rg 39 2k AVoyr 0 196 lout OpA 75 100 mV 150 AVoyt 0 1 lour 200A Sourcing 165 250 mV e 350 mV AVoyt 0 196 200uA Sinking Note 11 300 150 mV e 0 mV Isc Short Circuit Output Current Vout Shorted to GND 5 mA Vout Shorted to Viy 9 mA lin Supply Current 5 6 11 14 Vin 18V 5 9 12 15 pA FB Pin Input Current Vreg Vout 400mV 1 2 10 nA 76650055 LT66501S5 15 LT6650HS5 30 Turn On Time Ci oAD uF 0 5 ms en Output Noise Note 8 0 1Hz lt f lt 10Hz 20 uVp p 10Hz lt f lt 1KHz lgyr 200 Sourcing 23 UVRMS Vuys Hysteresis Note 9 AT 0 C to 70 C e 0 1 mV e 250 ppm AT 40 C to 85 C 0 24 mV e 600 ppm Note 1 Absolute Maximum Ratings are those values beyond which the life of a device may be impaired Note 2 The FB pin is protected by an ESD diode to the ground If the FB input voltage exceeds 0 3V below ground the FB input current should be limited to less than 10mA If the FB input voltage is greater than 5V the FB input current is expected to meet specified performance from Typical Performance Characteristics but is not tested or QA sampled at this voltage N
13. from the FB pin to GND The resistor values are related to the output voltage by the following relationship Rr Rg Vout 0 4 0 4 leg Re The lpg term represents the FB pin bias current and can generally be neglected when Rg is 100k or less For Rg 20k even worst case can be neglected error Vout 10mV DIV AC lout 200A 100uA 6650 07 Figure 7 Output Response to Current Sinking Load Step 100uA to 200A 1k Vout 0 4V 1 R Rg LT6650 FB Figure 8 Typical Configuration for Output Voltages Greater than 0 4V 6650 F08 contribution lt 0 15 Since the Voyy error distribution increases at twice the resistor tolerance high accuracy resistors or resistor networks are recommended The output voltage may be set to any level from 400mV up to 350mV below the supply voltage with source or sink capability Noise Reduction Capacitor In applications involving the use of resistive feedback for reference scaling the intrinsic reference noise is amplified along with the DC level To minimize noise amplification the use of a 1nF feedback capacitor is recommended as shown in Figure 8 and other circuits with scaling resistors Shunt Reference Operation The circuits shown in Figure 9 and Figure 10 form adjust able shunt references Along with the external bias resistor the LT6650 provides positive or negative reference operation for outputs between 1 4V and 18V posi
14. ge References Battery Powered 0 4V Reference LT6650 Temperature Drift Vin 1 4V TO 18V 402 TYPICAL 176650 PART or Vin 5V 4 401 NO LOAD SINK 200A Vg 400mV un B 22 Vour S 0 4V SOURCE 200uA 1 398 60 30 10 10 30 50 70 90 110 130 TEMPERATURE C 6650 01 6650 TAO1b 6650fa LI MYR 1 LT6650 ABSOLUTE MAXIMUM RATINGS Note 1 Total Supply Voltage Vin to GND 20V FB Voltage Note 2 20V to GND 0 3V Output Voltage OUT 20V to GND 0 3V Output Short Circuit Duration Indefinite FB Input 10mA Operating Temperature Range 4096 to 125 C Specified Temperature Range L10090 Sp TN 0 C to 70 C 66501 5 40 C to 85 C LT6650HS5 Note 3 40 C to 125 C Maximum Junction Temperature 150 C Storage Temperature Range Note 4 65 C to 150 C Lead Temperature Soldering 10 sec 300 C PACKAGC ORDER INFORMATION TOP VIEW FB 1 5 OUT GND 2 DNC 3 4 IN 5 PACKAGE 5 LEAD PLASTIC TSOT 23 Do Not Connect Tymax 150 C 230 C W ORDER PART NUMBER 55 PART MARKING LT6650CS5 LBDV 176650155 LBDV LT6650HS5 LBDV Order Options Tape and Reel Add TR Lead F
15. ote 3 If the part is operating at temperatures above 85 C it is recommended to enhance the stability margin by using an output capacitor greater than 10uF or a series RC combination having a 10045 equivalent time constant See Application section for details Note 4 If the part is stored outside of the specified temperature range the output voltage may shift due to hysteresis Note 5 ESD Electrostatic Discharge sensitive devices Extensive use of ESD protection devices are used internal to the LT6650 however high electrostatic discharge can damage or degrade the device Use proper ESD handling precautions Note 6 Load regulation is measured on a pulse basis from no load to the specified load current Output changes due to die temperature change must be taken into account separately Note 7 Dropout Voltage is Viy Voyr when falls to 0 1 below its nominal value at Viy 1 8V Note 8 Peak to Peak noise is measured with a single pole highpass filter at 0 1Hz and a 2 pole lowpass filter at 10Hz The unit is enclosed in a still air environment to eliminate thermocouple effects on the leads The test time is 10 seconds Note 9 Hysteresis in the output voltage is created by package stress that differs depending on whether the IC was previously at a higher or lower temperature Output voltage is always measured at 25 C but the IC is cycled to 85 C or 40 before a successive measurement Hysteresis is roughly proportional
16. r a 100us time constantas shown in Figure 1 and the Typical Performance Characteristics graphs The LT6650 Voltage reference should have an input by pass capacitor of 0 1uF or larger When the circuit is LT6650 Figure 1 LT6650 Input Output Configuration 6650fa 7 16650 APPLICATIONS INFORMATION operated from a small battery or other relatively high impedance source a minimum 1 capacitor is recom mended PSRR can be significantly enhanced by adding a low pass RC filter on the input with a time constant of 1ms or higher as shown in Figure 1 The Typical Perfor mance Characteristics graphs show performance as a function of several combinations of input and output capacitance An input RC of 100ms or more is recommended such as 5k and 22uF when output transients must be minimized in the face of high supply noise such as in automotive applications Figure 2 shows an input filter structure that effectively eliminates supply transients from affecting the output With this extra input decoupling and the L T6650 operating normally from a 12V bus 50V transients induce less than 0 59 Vour perturbations Figure 3 shows the turn on response time for the circuit in Figure 1 The input voltage steps from OV to 3V and the output is configured to produce 400mV Input bypass and output load capacitance are 1uF 00 Rz 00 and the output settles in approximately 0 5ms Figure 4 shows NOISY POWER BUS
17. ree Add PBF Lead Free Tape and Reel Add TRPBF Lead Free Part Marking http www linear com leadfree The temperature grades are identified by a label on the shipping container Consult LTC Marketing for parts specified with wider operating temperature ranges ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range otherwise specifications are at T 25 C Viy 5V Ciy 1 FB OUT no DC load C 1uF unless otherwise noted SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Vout Output Voltage Notes 4 5 LT6650 398 400 402 0 5 0 5 176650055 397 400 403 mV e 0 75 0 75 176650155 e 396 400 404 mV e i 1 LT6650HS5 e 394 400 406 mV e 1 5 1 5 VIN Operating Input Voltage 14 18 V AVout AVin Line Regulation 1 4V Vy lt 18V 1 6 mV 150 900 ppm V 76650055 LT66501S5 7 5 mV e 1130 ppm V LT6650HS5 8 5 mV e 1280 AVoyt Alout Load Regulation Note 6 Sourcing from to 2004A 0 04 0 2 mV 500 2500 ppm mA e 04 mV 5000 Sinking from OA to 200uA 0 24 1 mV 3000 12500 ppm mA e 2 mV 9 20000 ppm mA LT6650 ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range otherwise specifications are at Ty 25 Viy 5V Ciy 1uF FB OUT no DC load C 1uF unl
18. tive or negative Just like a Zener diode a supply Vs is required somewhat higher in magnitude than the desired reference Vs Vout 0 4V 1 RE Rg Vour 176650 FB 10 GND 6650 F09 Figure 9 Typical Configuration of LT6650 as Adjustable Positive Shunt Reference LT6650 FB GND Vs 6650 F10 Figure 10 Typical Configuration of LT6650 as Adjustable Negative Shunt Reference 6650fa 9 16650 APPLICATIONS INFORMATION Vout Rg must be within the following range for proper Operation the optimal value depends greatly on the direc tion and magnitude of the load current gt Vs Vourl 200uA 0 4 Re lt Vs Vour 15uA 0 4 Re Hysteresis Due to various mechanical stress mechanisms inherent to integrated circuit packaging internal offsets may not pre cisely recover from variations that occur over tempera ture and this effect is referred to as hysteresis Proprietary manufacturing steps minimize this hysteresis though some small residual error can occur Hysteresis measure ments for the LT6650 can be seen in Figures 11 and 12 Figure 11 presents the worst case data taken on parts subjected to thermal cycling between 0 C to 70 C while Figure 12 shows data for 40 C to 85 C cycling Units were cycled several times over these temperature ranges and the largest changes are shown As would be expected e LIGHT COLUMNS 0 C TO 25 C DARK COLUMNS 70 C
19. to 85 C Hysteresis 10 LT6650 SIMPLIFIED SCHEMATIC 6650 SS PACKAGE DESCRIPTION 5 Package 5 Lead Plastic TSOT 23 Reference LTC DWG 05 08 1635 Rev B 0 62 0 95 2 90 BSC MAX REF lt ___ gt NOTE 4 1 X n y 1 22 REF Y pe 1 50 1 75 3 85 MAX 2 62 REF 1 1 4 MIN 2 80880 NOTE 4 x i Y PIN ONE A Y RECOMMENDED SOLDER PAD LAYOUT 0 30 0 45 PER IPC CALCULATOR 0 95 BSC poe 5 PLCS NOTE 3 0 80 0 90 t 0 20 BSC 0 01 0 10 1 00 MAX DATUM A Lu V 5 0 30 0 50 REF acram 1 90 BSC NOTE NOTE 3 55 50 23 0302 REV B 1 DIMENSIONS ARE IN MILLIMETERS 2 DRAWING NOT TO SCALE 3 DIMENSIONS ARE INCLUSIVE OF PLATING 4 DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5 MOLD FLASH SHALL NOT EXCEED 0 254mm 6 JEDEC PACKAGE REFERENCE IS MO 193 6650fa However no responsibility is assumed for its use Linear Technology Corporation makes no represen EAR Information furnished by Linear Technology Corporation is believed to be accurate and reliable 1 1 HNOLOGY tation that the interconnection of its circuits as described herein will not infringe on existing patent rights LT6650 TYPICAL APPLICATION Adjustable
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LINEAR TECHNOLOGY LT6650 Manual