LT 定電流/定電圧、入力電流制限付き 2Aバッテリ・チャージャ

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しょうこかやぬま
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1 * µ ** µ D1 MBRS13LT3 C2.47µF L1** 22µH D pF NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED. R S4, R7 AND C1 ARE OPTIONAL FOR I IN LIMITING *TOKIN OR UNITED CHEMI-CON/MARCON CERAMIC SURFACE MOUNT **22µH SUMIDA CDRH125 SEE APPLICATIONS INFORMATION FOR INPUT CURRENT LIMIT AND UNDERVOLTAGE LOCKOUT SW CLN V CC BOOST COMP1 UV SPIN OVP SENSE R S3 2Ω 1% CLP PROG V C R S2 2Ω 1%.5Ω TERY CURRENT SENSE.33µF C IN * 15µF R3 39k.25% TERY VOLTAGE SENSE R4 162k.25% R7 5Ω C1 1µF 3Ω C PROG 1µF C OUT 22µF TANT D3 MBRS13LT3 R S4 ADAPTER CURRENT SENSE R PROG 4.93k 1% 4.2V 4.2V TO MAIN R5 SYSTEM POWER UNDERVOLTAGE LOCKOUT R6 5k 2 Li-Ion 1511 F1 V IN (ADAPTER INPUT) 11V TO 28V 1

2 ** 1 ** 2 ** 3 SW 4 BOOST 5 UV 6 ** 7 ** 8 OVP 9 CLP 1 CLN 11 COMP1 12 SENSE 13 ** 14 TOP VIEW 28 ** 27 ** 26 ** 25 V CC1 * 24 V CC2 * 23 V CC3 * 22 ** 21 PROG 2 V C 19 UV OUT 18 COMP SPIN 15 ** GN PACKAGE 28-LEAD PLASTIC SSOP T JMAX = 125 C, θ JA = 35 C/ W** ORDER PART NUMBER CGN IGN * ** PARAMETER CONDITIONS MIN TYP MAX UNITS Overall Supply Current V PROG = 2.7V, V CC 2V ma V PROG = 2.7V, 2V < V CC 25V ma Sense Amplifier CA1 Gain and Input Offset Voltage 8V V CC 25V, V 2V (With R S2 = 2Ω, R S3 = 2Ω) R PROG = 4.93k mv (Measured across )(Note 2) R PROG = 49.3k mv T J < C 7 12 mv V CC = 28V, = 2V R PROG = 4.93k 9 11 mv R PROG = 49.3k 7 13 mv T J < C 6 14 mv V CC Undervoltage Lockout (Switch OFF) Threshold Measured at UV Pin V UV Pin Input Current.2V V UV 8V.1 5 µa UV Output Voltage at UV OUT Pin In Undervoltage State, I UVOUT = 7µA.1.5 V UV Output Leakage Current at UV OUT Pin 8V V UV, V UVOUT = 5V.1 3 µa Reverse Current from Battery (When V CC Is 2V, V UV.4V 3 15 µa Not Connected, V SW Is Floating) 2

3 PARAMETER CONDITIONS MIN TYP MAX UNITS Overall Boost Pin Current V CC = 2V, V BOOST = V.1 1 µa V CC = 28V, V BOOST = V.25 2 µa 2V V BOOST V CC < 8V (Switch ON) 6 9 ma 8V V BOOST V CC 25V (Switch ON) 8 12 ma Switch Switch ON Resistance 8V V CC V MAX, I SW = 2A, V BOOST V SW 2V Ω I BOOST / I SW During Switch ON V BOOST = 24V, I SW 2A ma/a Switch OFF Leakage Current V SW = V, V CC 2V 2 1 µa 2V < V CC 28V 4 2 µa Minimum I PROG for Switch ON µa Minimum I PROG for Switch OFF at V PROG 1V ma Maximum for Switch ON V CC 2 V Current Sense Amplifier CA1 Inputs (Sense, ) Input Bias Current µa Input Common Mode Low.25 V Input Common Mode High V CC 2 V SPIN Input Current 1 2 µa Reference Reference Voltage (Note 3) R PROG = 4.93k, Measured at OVP with VA Supplying I PROG and Switch OFF V Reference Voltage All Conditions of V CC,T J C V T J < C (Note 4) V Oscillator Switching Frequency khz Switching Frequency All Conditions of V CC,T J C khz T J < C khz Maximum Duty Cycle 85 % T A = 25 C 9 93 % Current Amplifier CA2 Transconductance V C = 1V, I VC = ±1µA µmho Maximum V C for Switch OFF.6 V I VC Current (Out of Pin) V C.6V 1 µa V C <.45V 3 ma 3

4 PARAMETER CONDITIONS MIN TYP MAX UNITS Voltage Amplifier VA Transconductance (Note 3) Output Current from 5µA to 5µA mho Output Source Current V OVP = V REF 1mV, V PROG = V REF 1mV 1.1 ma OVP Input Bias Current At.75mA VA Output Current ±3 ±1 na At.75mA VA Output Current, T J > 9 C 1 25 na Current Limit Amplifier CL1, 8V Input Common Mode Turn-On Threshold.75mA Output Current mv Transconductance Output Current from 5µA to 5µA mho CLP Input Current.75mA Output Current, V UV.4V.3 1 µa CLN Input Current.75mA Output Current V UV.4V.8 2 ma EFFICIENCY (%) V IN = 16.5 = 8.4V CHARGER EFFICIENCY INCLUDES LOSS IN DIODE D I (A) I CC (ma) V CC = 16V C 25 C 125 C DUTY CYCLE (%) 8 I CC (ma) MAXIMUM DUTY CYCLE C 25 C 125 C V CC (V) G G G3 4

5 .3 4 V REF (V) ALL TEMPERATURES VOVP (mv) C 25 C V CC (V) I VA (ma) 1769 G G5 DUTY CYCLE (%) TEMPERATURE ( C) 1769 G6 IVC (ma) V C (V) 1769 G IPROG (ma) 125 C 25 C REFERENCE VOLTAGE (V) V PROG (V) TEMPERATURE G G9 5

6 µ µ 6 µ µ µ µ µ

7 UV UV OUT 6.7V 2kHz OSCILLATOR V SW.7V SHUTDOWN S V CC BOOST V CC 1.5V R R R Q SW PWM C1 SLOPE COMPENSATION B1 R2 V CC CA1 SW SPIN SENSE R S3 R S2 I R3 R1 1k I PROG VP V C 75k CA2 V REF VA g m =.64 Ω V REF 2.465V 1mV CLP CL1 CLN COMP1 COMP2 C PROG PROG I PROG R PROG I = (I PROG)(R S2 ) = 2.465V R ( S2 R PROG ( (R S3 = R S2 ) ) ) 1769 BD 7

8 V C.47µF 6k CA2 1k CA1 SPIN SENSE R S3 2Ω R S2 2Ω 1Ω V REF PROG 1µF 3Ω R PROG.65V 1k LT16 2k 1769 TC1 OVP VA PROG V REF I PROG 1k 1k.47µF R PROG 2.465V LT TC2 8 µ

9 µ µ I RMS =.29 ( ) 1 (L1)(f) ( ) V CC µ µ µ µ µ µ R5 = R6(V IN V UV ) VUV 9

10 µµ CL1 1mV CLP CLN V CC UV 1µF R S4 * 5Ω *R S4 = 1mV ADAPTER CURRENT LIMIT AC ADAPTER OUTPUT R5 R F2 V IN µ ( ) ( )( ) R I = I S2 PROG = 2.465V R PROG R S2 (I R S2 = R S3 = )(R PROG )( ) 2.465V (2A)(5k)(.5) = = 2Ω 2.465V 1

11 5V V PWM I = (DC)(2A) PROG 3Ω R PROG 4.7k Q1 VN2222 C PROG 1µF 1769 F3 µ µ µ ( )( = ) = R4 V R = 39k ( ) 162k µ µ OVP Q3 VN2222 R3 12k.25% R4 4.99k.25% R5 22k V IN 1769 F4 4.2V 4.2V 11

12 R1* 1.6k R2 56k.5Ω C1.1µF I D2 1N4148 R S3 2Ω R S2 2Ω ADAPTER OUTPUT SENSE D1 1N LT V OR 5V R4 47k NEGATIVE EDGE TO TIMER R1 R2 ILOW IHI ILOW = ( )( ) = ( )( ) 12 R3 43k 3Ω PROG R1 49.3k 1µF Q1 R1(V * TRIP CURRENT = ) (R2 R3)( ) (1.6k)(8.4V) = 27mA (56k 43k)(.5Ω) R2 5.49k 1769 F F4

13 PBIAS 3.5mA VIN 1.5mA V V 2 7.5mA.12 I VIN I V 2 V ( )( ) 1 3 PDRIVER = 55( VIN) PSW = ( )( ) ( ) ( ) ( )( ) I 2 RSW V VIN [ ] = ( ) ( )( ) ( )( )( )( ) tol VIN I f P 3.5mA mA 12.6 P P BIAS DRIVER SW = ( )( ) ( ) 2 [ ] = ( ) ( )( ) 7.5mA.12 2mA.35W 2 ()( ) = =.43W ( ) kHz 19 =.42.8 =.5W = ()( )( ) ( )( )( ) V ( I )( V )( VX ) 1 X 3 P DRIVER = 55( VIN) P V X L1 I VX C2 D2 1µF SW BOOST SPIN 1769 F7 V 2A 126V 33V = 9. W 55 19V ( )( )( ) DRIVER = ( ) P V DRIVER X 9. W = = 28mA 33. V 13

14 45 STANDARD CONNECTION HIGH DUTY CYCLE CONNECTION THERMAL RESISTANCE ( C/W) LAYER BOARD 4-LAYER BOARD MEASURED FROM AIR AMBIENT TO DIE USING COPPER LANDS AS SHOWN ON DATA SHEET BOARD AREA (IN 2 ) 1769 F8 C3.47µF D2 SW BOOST SPIN SENSE C3.47µF D2 V X 3V TO 6V CX 1µF SW BOOST LT1679 SPIN SENSE 1769 F1 HIGH DUTY CYCLE CONNECTION LEAD TEMPERATURE ON PINS 1, 2, 3 ( C) NOTE: PEAK DIE TEMPERATURE WILL BE ABOUT 15 C HIGHER AT 2A CHARGE CURRENT V IN = 19V = 12.3V V BOOST = 5V 2-LAYER BOARD ROOM TEMP = 24 C 5 IN 2 BOARD 25 IN 2 BOARD CHARGE CURRENT (A) F9 V IN Q1 R X 5k Q1 = Si4435DY Q2 = TP61L Q2 D1 C2.47µF D2 V X 3V TO 6V CX 1µF SW V CC BOOST SPIN SENSE 1769 F11 14 µ

15 L1 L1 CLP CLN SW V CC PARASITIC INTERNAL DIODE SW CLP CLN V CC PARASITIC INTERNAL DIODE R7 5Ω C1 1µF C IN C1 1µF C IN R7 5Ω D3 R S4 D3 R S4 D4 ADAPTER IN TO SYSTEM POWER 1769 F12a ADAPTER IN TO SYSTEM POWER V IN C IN SWITCH NODE HIGH FREQUENCY CIRCULATING PATH D1 L1 C OUT 1769 F12b 1769 F13 15

16 D1 C IN SW V CC1 L1 TO TO C OUT NOTE: CONNECT ALL PINS TO EXPANDED PC LANDS FOR PROPER HEAT SINKING 1769 F ( ).15 ±.4 (.38 ±.1) 45 8 TYP ( ).4.9 ( ) * ( ) (.838) REF.16.5 ( ).8.12 (.23.35) * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED.6" (.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED.1" (.254mm) PER SIDE.25 (.635) BSC ( ) ** ( ) GN28 (SSOP) i 399.5K PRINTED IN JAPAN LINEAR TECHNOLOGY CORPORATION 1999

LTC 高効率同期整流式降圧スイッチング・レギュレータ

LTC 高効率同期整流式降圧スイッチング・レギュレータ µ LTC1735-1 C OSC 47pF C C2 330pF 47pF PGOOD 1 C OSC TG C SS 0.1µF 2 RUN/SS BOOST R C1 33k 3 I TH LTC1735-1 SW C C1 47pF 4 5 PGOOD SENSE V IN 1000pF 6 7 8 SENSE V OSENSE SGND BG PGND EXTV CC 10Ω 10Ω 16