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| Preliminary Data Sheet April 2003 PSC1534 Lithium-Ion Linear Battery Charger Features s s Applications s Low external component count and small footprint Charge termination indication and manual shutdown using PROG pin Programmable charge current: 200 mA to 800 mA 4.1 V or 4.2 V preset voltages Automatic trickle charging at IPROG/10 for heavily discharged batteries requires no additional external components Very low quiescent battery current during shutdown and standby (charger removed) Charger undervoltage lockout and battery overvoltage lockout Overcurrent/overtemperature protection Low-profile (1 mm) SOT-23 package Any application that requires a compact, low-cost solution for Li-Ion battery charging s s s Typical Application VIN 5V 3 1 F 10 k 2 ISENSE 1 FMMT549 IBAT = 500 mA + SINGLE Li-Ion BATTERY VCC PSC1534 6 GND DRIVE BAT 5 s To A/D 4 PROG RPROG 3 k 10 F s s s Figure 1. 500 mA Li-Ion Battery Charger 5V VBAT (V) Description The PSC1534 is a constant-current/constant-voltage Li-Ion battery charger controller that is functionally equivalent and performance equivalent to the LTC (R)1734. As an enhancement, the PSC1534 also includes automatic detection and trickle charging of deeply discharged batteries (VBAT <2.42 V). The PSC1534 allows charge current programming using a single external resistor, RPROG. The voltage on the PROG pin is proportional to the charging current at the ISENSE pin, allowing the user to use an external A/D to monitor charging progress. A low battery drain (BAT pin) manual shutdown state can be forced by floating the PROG pin. When the input supply (VIN) is removed, the PSC1534 enters a very lowcurrent sleep mode, during which BAT input supply current is <1 A. VBAT 4V 3V 2V 1.5 V 1V 0V CONSTANT CURRENT CONSTANT VOLTAGE VPROG VPROG (V) CHARGING BEGINS CHARGING COMPLETE Figure 2. PROG Pin Indicates Charge Status PSC1534 Lithium-Ion Linear Battery Charger Preliminary Data Sheet April 2003 Block Diagram VIN 1 F 3 1.5 V 2.15 V 2.5 V VCC VOLTAGE REFERENCE IBAT/1000 90 - IBAT 0.09 1 SHUTDOWN PNP DRIVER 6 ISENSE + OAI1 UVLO TEMP. LIMIT CURRENT LIMIT DRIVE FMMT529 IBAT SHUTDOWN 2.15 V + SHDN CMP SHUTDOWN 1.5 V OAI2 - OAV1 - 2.5 V 5 BAT 10 F SINGLE Li-Ion CELL - 3 A SHUTDOWN 4 PROG RPROG 2 GND Figure 3. PSC1534 Block Diagram 2 Agere Systems Inc. Preliminary Data Sheet April 2003 PSC1534 Lithium-Ion Linear Battery Charger Pin Information TOP VIEW ISENSE 1 6 DRIVE GND 2 5 BAT VCC 3 TJMAX = 125 C, JA = 230 C/W 4 PROG Figure 4. S6 Package, 6-Lead Plastic, 1 mm Thick, SOT-23 Table 1. Pin Descriptions Pin Number 1 2 3 Signal Name ISENSE GND VCC Type Output GND Supply Description Charging current sense node. Supplies a monitored and controlled current from VCC to the PNP emitter. Ground reference for all internal circuits. Kelvin connects battery ground to GND to minimize battery top-off voltage error. Positive input supply for all internal circuits and external charging current (PNP emitter). The internal charging current control loop monitors and controls the current flow between VCC and ISENSE. Bypass this pin to GND with a 1 F to 10 F tantalum capacitor. Charge current programming pin. Use an external resistor, RPROG, to set current-mode charging current. ICHRG = 1.5 V/RPROG. If the voltage on PROG exceeds 2.15 V, the PSC1534 enters manual shutdown mode. This pin can be monitored by an external A/D converter. Battery voltage sense input. Bypass this pin with a 10 F tantalum capacitor close to BAT and GND. Output base driver for PNP transistor. This driver output is current limited and monitored by an internal thermal shutdown circuit that will disable the driver if high-current fault conditions occur. 4 PROG I/O 5 6 BAT DRIVE I/O Output Agere Systems Inc. 3 PSC1534 Lithium-Ion Linear Battery Charger Preliminary Data Sheet April 2003 Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Table 1. Absolute Maximum Ratings* Parameter Supply Voltage (VCC) Input Voltage (BAT, PROG) Output Voltage (DRIVE) Output Current (ISENSE) Short-circuit Duration (DRIVE) Junction Temperature Operating Ambient Temperature Range Operating Junction Temperature Storage Temperature Range Lead Temperature (soldering, 10 s) Value -0.3 to +6.5 -0.3 to (VCC + 0.3) -0.3 to (VCC + 0.3) -900 Indefinite 125 -40 to +85 100 -65 to +150 300 Unit V V V mA -- C C C C C * Absolute maximum ratings are those values beyond which the life of a device may be impaired. Some electrical characteristics are guaranteed by design and statistical process control. 4 Agere Systems Inc. Preliminary Data Sheet April 2003 PSC1534 Lithium-Ion Linear Battery Charger Electrical Characteristics In Table 2, specifications are at TA = 25 C. VCC = 5 V, GND = 0 V, and VBAT = VFLOAT unless otherwise noted. Bold text highlights the specifications that apply over the -40 C to +85 C operating temperature range. Table 2. Electrical Characteristics Parameter Operating Supply Range* Quiescent VCC Pin Supply Current VCC Pin Supply Current in Manual Shutdown Battery Drain Current in Manual Shutdown Battery Drain Current in Sleep Mode Undervoltage Lockout Exit Threshold Undervoltage Lockout Entry Threshold Undervoltage Lockout Hysteresis Output Float Voltage in Constant Voltage Mode Conditions VCC Supply Min Typ -- 550 350 0.2 Max Unit 6.0 1150 900 2 V A A A -- 4.55 VBAT = 5 V, (forces IDRIVE = IBAT = 0), -- IPROG = 200 A, (7500 from PROG to GND) PROG pin open -- PROG pin open VCC = 0 V VCC increasing VCC decreasing VCC decreasing Charging Performance 4.1 V version, IBAT = 10 mA, 4.55 V VCC 5.5 V, 4.2 V version, IBAT = 10 mA, 4.55 V VCC 5.5 V RPROG = 7500 , 4.55 V VCC 5.5 V, pass PNP beta > 50 RPROG = 2143 , 4.55 V VCC 5.5 V, pass PNP beta > 50 IBAT = 10% of IBAT1, RPROG = 7500 4.55 V VCC 5.5 V, pass PNP beta > 50, 0 C TA 85 C IBAT = 10% of IBAT2, RPROG = 2143 , 4.55 V VCC 5.5 V, pass PNP beta > 50, 0 C TA 85 C VDRIVE = 3.5 V -2 -2 0.2 2 A 4.45 4.56 4.68 V 4.30 4.41 4.53 V -- 150 -- mV 4.059 4.10 4.141 4.158 4.20 4.242 V V Output Full-scale Current When Programmed for 200 mA in Constant Current Mode Output Full-scale Current When Programmed for 700 mA in Constant Current Mode Current Monitor Voltage on PROG Pin 155 200 240 mA 620 700 770 mA 0.025 0.15 0.30 V Current Monitor Voltage on PROG Pin 0.08 0.15 0.22 V Drive Output Current 30 -- -- mA * When operating near minimum VCC, a low Vce-sat PNP transistor is required. External PNP pass transistor has negligible Ib-c when the Vb-c = 0.8 V (VCC - VBAT = 5.0--4.2 = 0.8 V). External PNP pass transistor has negligible Ib-e when the Vb-e = 4.2 V (VBAT - VCC = 4.2--0 = 4.2 V). Agere Systems Inc. 5 PSC1534 Lithium-Ion Linear Battery Charger Preliminary Data Sheet April 2003 Electrical Characteristics (continued) Table 2. Electrical Characteristics (continued) Conditions Min Automatic Trickle Charging 2.32 Trickle Charge Battery Voltage Entry Threshold VBAT decreasing Trickle Charge Battery Voltage Exit Threshold VBAT increasing 2.42 Trickle Charge Battery Voltage Hysteresis -- -- Trickle Charge--Charge Current RPROG = 3000 , 10 4.55 V VCC 5.5 V, pass PNP beta > 50 Charger Manual Control 2.05 Manual Shutdown Threshold VPROG increasing Manual Shutdown Hysteresis VPROG decreasing from VMSDT -- Programming Pin Pull-up Current VPROG = 2.5 V -6 Protection Drive Output Short-circuit Current Limit VDRIVE = VCC 35 When operating near minimum VCC, a low Vce-sat PNP transistor is required. External PNP pass transistor has negligible Ib-c when the Vb-c = 0.8 V (VCC - VBAT = 5.0--4.2 = 0.8 V). External PNP pass transistor has negligible Ib-e when the Vb-e = 4.2 V (VBAT - VCC = 4.2--0 = 4.2 V). Parameter Typ 2.42 2.52 100 50 Max 2.52 2.62 -- 90 Unit V V mV mA 2.15 90 -3 65 2.25 -- -1.5 130 V mV A mA Typical Performance Characteristics 4.220 Vfloat (VCC=5V, IBAT =10 mA, PNP=FCX717) 4.205 Vcc =5V T =25C A PNP=FCX717 4.210 4.202 Float 4.190 V 4.197 4.180 -50 -25 0 25 50 75 100 125 FLOAT 4.200 (V) 4.200 4.195 0 100 200 300 I 400 500 (mA) 600 700 Temperature (C) V BAT Figure 5. Float Voltage vs. Temperature Figure 6. VFLOAT vs. IBAT (RPROG = 2 k) 6 Agere Systems Inc. Preliminary Data Sheet April 2003 PSC1534 Lithium-Ion Linear Battery Charger Typical Performance Characteristics (continued) 220.0 V =5.0V, CC 800.0 V =5.0V CC R 210.0 PROG =7.5 kOhms 775.0 R PROG =2 kOhms PNP=FCX717 PNP=FCX717 (mA) (mA) I BAT 200.0 750.0 I BAT 190.0 725.0 180.0 -50 -25 0 25 50 75 100 125 700.0 -50 -25 0 25 50 75 100 125 Temperature (C) Temperature (C) Figure 7. IBAT1 vs. Temperature, RPROG = 7.5 k 1.500 R=7.5 kohms TA=25C, Figure 10. IBAT1 vs. Temperature, RPROG = 2 k 1.500 R=2 kohms TA=25C, 1.250 VCC=5V 1.250 VCC=5V 1.000 1.000 (V) PROG (V) 0.7500 V 0.7500 0.5000 0.5000 0.2500 0.2500 0.000 0.000 0 50 100 I BAT V PROG 0 150 (mA) 200 250 100 200 300 I 400 BAT 500 600 700 800 (mA) Figure 8. VPROG vs. IBAT1 (RPROG = 7.5 k) 3.600 V =6V CC Figure 11. VPROG vs. IBAT (RPROG = 2 k) 4.000 V =5.0V CC T =25C A 3.400 3.500 R PROG =3 kOhms PNP=FCX717 Pull-Up (uA) 3.200 (uA) I 2.500 PROG 3.000 I 2.800 2.600 2 3 V 4 PROG PROG 3.000 5 (V) 6 2.000 -50 -25 0 25 50 75 100 125 Temperature (C) Figure 9. IPROG_PU vs. VCC Agere Systems Inc. Figure 12. IPROG_PU vs. Temperature 7 PSC1534 Lithium-Ion Linear Battery Charger Preliminary Data Sheet April 2003 Package Description S6 Package, 6-Lead Plastic SOT-23 All dimensions are in millimeters. 2.80--3.10 (0.110--0.118) 0.20 (0.008) 0.30--0.50 REF (0.012--0.019 REF) 1.50--1.75 2.60--3.00 (0.102--0.118) (0.059--0.069) PIN 1 ID 0.80--0.90 (0.031--0.035) 0.09--0.20 (0.004--0.008) 0.95 (0.037) REF 0.25--0.50 (0.010--0.020) (6 PLCS) 1.00 MAX (0.039 MAX) 0.01-- 0.10 (0.0004--0.004) Ordering Information Table 3. Ordering Information Device Version PSC1534-4.1 PSC1534-4.2 Part Order Number 700045365 700045383 SOT-23-6 Package Marking Axxx Lxxx LTC and LT are registered trademarks of Linear Technology Corporation. For additional information, contact your Agere Systems Account Manager or the following: INTERNET: http://www.agere.com E-MAIL: docmaster@agere.com N. AMERICA: Agere Systems Inc., Lehigh Valley Central Campus, Room 10A-301C, 1110 American Parkway NE, Allentown, PA 18109-9138 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA: Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon Tel. (852) 3129-2000, FAX (852) 3129-2020 CHINA: (86) 21-5047-1212 (Shanghai), (86) 755-25881122 (Shenzhen) JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 6778-8833, TAIWAN: (886) 2-2725-5858 (Taipei) EUROPE: Tel. (44) 7000 624624, FAX (44) 1344 488 045 Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. Agere, Agere Systems, and the Agere logo are trademarks of Agere Systems Inc. Copyright (c) 2003 Agere Systems Inc. All Rights Reserved April 2003 DS02-365MTD |
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