LTC1732-4/LTC1732-4.2 Lithium-Ion Linear Battery Charger Controller FEATURES DESCRIPTIO n Complete Linear Charger Controller for 1-Cell The LTC 1732 is a complete constant-current/constant- Lithium-Ion Batteries voltage linear charger controller for lithium-ion n Preset Charge Voltage with 1% Accuracy (Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel metal- n Programmable Charge Current hydride (NiMH) batteries can also be charged with con- n C/10 Charge Current Detection Output stant current using external termination. Charge current n Programmable Charge Termination Timer can be programmed with 7% (max) accuracy using exter- n Small, Thin 10-Pin MSOP Package nal sense and program resistors. An internal resistor n Select Pin Charges 4.1V or 4.2V Cells (LTC1732-4) divider and precision reference set the final float voltage n Input Supply (Wall Adapter) Detection Output with 1% accuracy. The SEL pin allows users to charge n 4.5V to 12V Input Voltage Range either 4.1V or 4.2V cells. n Automatic Sleep Mode When Input Supply When the input supply is removed, the LTC1732 automati- is Removed (Only 7m A Battery Drain) cally enters a low current sleep mode, dropping the battery n Automatic Trickle Charge of Low Voltage Cells drain current to 7m A. An internal comparator detects the n Programmable for Constant-Current-Only Mode end-of-charge (C/10) condition while a programmable n Battery Insertion Detect timer, using an external capacitor, sets the total charge n 4.05V Recharge Threshold for 4.2V Cells time. Fully discharged cells are automatically trickle charged (LTC1732-4.2) at 10% of the programmed current until cell voltage n 3.8V Recharge Threshold for 4.1V or 4.2V Cells exceeds 2.457V. (LTC1732-4) The LTC1732 begins a new charge cycle when a discharged U battery is connected to the charger or when the input power APPLICATIO S is applied. In addition, if the battery remains connected to the charger and the cell voltage drops below 3.8V for the n Cellular Phones LTC1732-4 or below 4.05V for the LTC1732-4.2, a new n Handheld Computers charge cycle will automatically begin. n Charging Docks and Cradles The LTC1732 is available in the 10-pin MSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Single Cell 4.2V Li-Ion Battery Charger V = 6V IN MBRM120T3 8 2 R2 R SENSE 1k V SEL 1F CC 0.2 9 R1 SENSE 1k 3 7 Q1 CHRG DRV Si9430DY LTC1732-4 I = 500mA BAT 1 10 ACPR BAT 4 6 TIMER PROG C TIMER GND 4.2V + R * PROG 0.1F 10F Li-Ion 5 19.6k CELL 1732 TA01 *SHUTDOWN INVOKED BY FLOATING THE PROG PIN 1 U ULTC1732-4/LTC1732-4.2 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Input Supply Voltage (V ) ................................... 13.2V CC ORDER PART SENSE, DRV, BAT, SEL, TIMER, PROG, NUMBER TOP VIEW CHRG, ACPR ......................................... 0.3V to 13.2V BAT 1 10 ACPR LTC1732EMS-4 SEL 2 9 SENSE Operating Temperature Range (Note 2) .... 40 to 85 C CHRG 3 8 V CC LTC1732EMS-4.2 TIMER 4 7 DRV Storage Temperature Range ................. 65 C to 150 C GND 5 6 PROG Lead Temperature (Soldering, 10 sec).................. 300 C MS10 PART MARKING MS10 PACKAGE 10-LEAD PLASTIC MSOP T = 140 C, q = 180 C/W JMAX JA LTNJ LTUA 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 13 mA Sleep Mode (Battery Drain Current) 7 20 m A V Regulated Output Voltage LTC1732-4 5V V 12V, V = GND l 4.059 4.1 4.141 V BAT CC SEL LTC1732-4/LTC1732-4.2 5V V 12V, V = V l 4.158 4.2 4.242 V CC SEL 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 60 100 140 mA PROG SENSE I Trickle Charge Current V = 2V, R = 19.6k, I = (V V )/0.2W l 30 50 110 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 V Automatic Shutdown Threshold Voltage (V V ) High to Low 30 54 90 mV ASD CC BAT (V V ) Low to High 40 69 100 mV CC BAT V Voltage Mode Disable Threshold Voltage V = V V 0.4 V DIS DIS CC TIMER I PROG Pin Current Internal Pull-Up Current, No R 2.5 m A PROG PROG PROG Pin Source Current, D V 5mV l 300 m A PROG V PROG Pin Voltage R =19.6k 2.457 V PROG PROG V ACPR Pin Output Low Voltage I = 5mA 0.7 1.2 V ACPR ACPR I CHRG Pin Weak Pull-Down Current V = 1V 15 35 55 m A CHRG CHRG V CHRG Pin Output Low Voltage I = 5mA 0.6 1.2 V CHRG CHRG V SEL Pin Threshold l 0.3 2 V SEL 2 U W U U WWW