LTC1731-4.1/LTC1731-4.2 Single Cell Lithium-Ion Linear Battery Charger Controllers FEATURES DESCRIPTIO n Complete Linear Charger Controller for The LTC 1731 is a complete constant-current/constant- 1-Cell Lithium-Ion Batteries voltage linear charger controller for single cell lithium-ion n 1% Voltage Accuracy batteries. Nickel-cadmium (NiCd) and nickel-metal-hy- n Programmable Charge Current dride (NiMH) batteries can also be charged with constant n C/10 Charge Current Detection Output current using external termination. The external sense n Programmable Charge Termination Timer resistor sets the charge current with 5% accuracy. An n Space Saving 8-Pin MSOP Package internal resistor divider and precision reference set the n Automatic Sleep Mode When Input Supply final float potential with 1% accuracy. The output float is Removed (7m A Battery Drain) voltage is set internally to 4.1V (LTC1731-4.1) or 4.2V n Automatic Trickle Charging of Low Voltage Cells (LTC1731-4.2). n Programmable for Constant-Current-Only Mode When the input supply is removed, the LTC1731 automati- cally enters a low current sleep mode, dropping the battery U drain current to typically 7m A. An internal comparator APPLICATIO S detects the end-of-charge (C/10) condition while a pro- n Cellular Phones grammable timer, using an external capacitor, sets the n Handheld Computers total charge time. Fully discharged cells are automatically n Charging Docks and Cradles trickle charged at 10% of the programmed current until n Programmable Current Source cell voltage exceeds 2.457V. The LTC1731 is available in the 8-pin MSOP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO 500mA Li-Ion Battery Charger V = 6V IN MBRM120T3 7 R 1k SENSE V 1F CC 0.2 CHARGE 8 SENSE STATUS 2 6 Q1 CHRG DRV Si9430DY LTC1731-4.2 I = 500mA BAT 3 1 TIMER BAT 5 PROG C TIMER 0.1F GND + R * Li-ION PROG 10F 4 19.6k CELL 1731 TA01 *SHUTDOWN INVOKED BY FLOATING THE PROG PIN 1 U ULTC1731-4.1/LTC1731-4.2 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Supply Voltage (V ) ................................... 13.2V Operating Temperature Range (Note 2) .....40 to 85 C CC Input Voltage (SENSE, DRV, BAT, Storage Temperature Range ................. 65 C to 150 C TIMER, PROG) .................................. 0.3V to 13.2V Lead Temperature (Soldering, 10 sec).................. 300 C Output Voltage (CHRG) ......................... 0.3V to 13.2V PACKAGE/ORDER INFORMATION ORDER PART ORDER PART TOP VIEW NUMBER NUMBER TOP VIEW BAT 1 8 SENSE BAT 1 8 SENSE LTC1731EMS8-4.1 LTC1731ES8-4.1 CHRG 2 7 V CHRG 2 7 V CC CC TIMER 3 6 DRV LTC1731EMS8-4.2 LTC1731ES8-4.2 TIMER 3 6 DRV GND 4 5 PROG GND 4 5 PROG MS8 PACKAGE MS8 PART MARKING S8 PART MARKING 8-LEAD PLASTIC MSOP S8 PACKAGE T = 150 C, q = 200 C/W 8-LEAD PLASTIC SO JMAX JA LTJK 173141 T = 150 C, q = 125 C/W JMAX JA LTKQ 173142 Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 6V unless otherwise noted. A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Supply Voltage l 4.5 12 V CC I Input Supply Current Charger On, Current Mode l 13 mA CC Shutdown Mode l 12 mA Sleep Mode (Battery Drain Current) 7 20 m A V Regulated Output Voltage LTC1731-4.1 (5V V 12V) l 4.059 4.1 4.141 V BAT CC LTC1731-4.2 (5V V 12V) l 4.158 4.2 4.242 V CC I Current Mode Charge Current R = 19.6k, R = 0.2W 465 500 535 mA BAT PROG SENSE R = 19.6k, R = 0.2W l 415 585 mA PROG SENSE R = 97.6k, R = 0.2W 70 100 130 mA PROG SENSE I Trickle Charge Current V = 2V, R = 19.6k, I = (V V )/0.2W l 30 50 100 mA TRIKL BAT PROG TRIKL CC SENSE V Trickle Charge Threshold Voltage From Low to High l 2.35 2.457 2.55 V TRIKL V V Undervoltage Lockout Voltage From Low to High l 4.1 4.5 V UV CC D V V Undervoltage Lockout Hysteresis 200 mV UV CC V Manual Shutdown Threshold Voltage PROG Pin Low to High 2.457 V MSD PROG Pin High to Low 2.446 V 2 U W U U WWW