LTC4050 Lithium-Ion Linear Battery Charger with Thermistor Interface FEATURES DESCRIPTIO n Complete Standalone Linear Charger Controller The LTC 4050-4.1/LTC4050-4.2 are complete standalone for 1-Cell Lithium-Ion Batteries constant-current/constant-voltage linear charge control- n Thermistor Interface for Battery Temperature lers for lithium-ion (Li-Ion) batteries. Charge current is Sensing programmable and final float voltage has 1% accuracy. n Preset Charge Voltage with 1% Accuracy When the input supply is removed, the LTC4050 automati- n Programmable Charge Current cally enters a low quiescent current sleep mode, dropping n C/10 Charge Current Detection Output the battery drain current to 5m A. An internal comparator n Programmable Charge Termination Timer detects the near-end-of-charge (C/10) condition while a n Input Supply (Wall Adapter) Detection Output programmable timer, using an external capacitor, sets the n 4.5V to 10V Input Voltage Range total charge time. Fully discharged cells are automatically n Automatic Sleep Mode When Input Supply trickle charged at 10% of the programmed current until is Removed (Only 5m A Battery Drain) cell voltage exceeds 2.49V. The thermistor interface n Automatic Trickle Charging of Low Voltage Cells suspends charging if the cell temperature is outside of a n Automatic Battery Recharge 0 C to 50 C temperature window. n Battery Insertion Detection n The LTC4050 begins a new charge cycle when a discharged Space Saving 10-Pin MSOP Package battery is connected to the charger or when the input power U is applied. In addition, a new charge cycle is automatically APPLICATIO S started if the battery remains connected to the charger and the cell voltage drops below 3.88V for 4.1V cells or below n Cellular Phones 3.98V for 4.2V cells. n Handheld Computers n Charging Docks and Cradles The LTC4050 is available in the 10-pin MSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Single Cell 4.2V 500mA Li-Ion Battery Charger Charge Current vs Thermistor Temperature V IN 6V 600 V = 3.7V BAT MBRM120T3 500 8 1k 0.2 400 V 1F CC 1k 9 SENSE 3 7 300 Si9430DY CHRG DRV LTC4050-4.2 I = 500mA BAT 200 10 1 ACPR BAT 4 6 TIMER PROG * 100 GND NTC 4.2V + 10k NTC 0.1F 10F 19.6k Li-Ion T DALE NTHS-1206N02 52 0 CELL 50 25 50 75 100 125 25 0 THERMISTOR TEMPERATURE (C) 4050 TA01 4050 TA05 *SHUTDOWN INVOKED BY FLOATING THE PROG PIN 4050f 1 CHARGE CURRENT (mA) U ULTC4050 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Input Supply Voltage (V ) ...................................... 12V CC ORDER PART SENSE, DRV, BAT, SEL, NUMBER TIMER, PROG, CHRG, ACPR .................0.3V to 12V TOP VIEW LTC4050EMS-4.1 BAT 1 10 ACPR Operating Temperature Range (Note 2) . 40 C to 85 C NTC 2 9 SENSE LTC4050EMS-4.2 Storage Temperature Range ................. 65 C to 150 C CHRG 3 8 V CC TIMER 4 7 DRV Lead Temperature (Soldering, 10 sec).................. 300 C GND 5 6 PROG MS PACKAGE MS PART MARKING 10-LEAD PLASTIC MSOP T = 140 C, q = 180 C/W JMAX JA LTTW LTTX Consult LTC Marketing 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 10 V CC I Input Supply Current Charger On, Current Mode l 1.3 3 mA CC Shutdown Mode l 1.3 3 mA Sleep Mode (Battery Drain Current) 5 15 m A V Regulated Output (Float) Voltage in LTC4050-4.1 5V V 10V, 0 C T 85 C 4.059 4.1 4.141 V BAT CC A Constant Voltage Mode LTC4050-4.2 5V V 10V, 0 C T 85 C 4.158 4.2 4.242 V CC A LTC4050-4.1 5V V 10V l 4.039 4.1 4.141 V CC LTC4050-4.2 5V V 10V l 4.137 4.2 4.242 V CC I Current Mode Charge Current R = 19.6k, R = 0.2W 440 500 535 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 20 55 90 mA TRIKL BAT PROG TRIKL CC SENSE V Trickle Charge Threshold Voltage l 2.41 2.49 2.58 V TRIKL V V Undervoltage Lockout Voltage l 44.5 V UV CC D V V Undervoltage Lockout Hysteresis 130 mV UV CC V PROG Pin Manual Shutdown 3.6 V MSD Threshold Voltage V Automatic Shutdown Threshold Voltage (V V ) High to Low 25 54 85 mV ASD CC BAT (V V ) Low to High 40 69 100 mV CC BAT I PROG Pin Current Internal Pull-Up Current, No R 2.3 m A PROG PROG PROG Pin Source Current, D V 5mV l 300 m A PROG V PROG Pin Voltage R =19.6k 2.47 V PROG PROG V ACPR Pin Output Low Voltage I = 5mA 0.525 V ACPR ACPR I CHRG Pin Weak Pull-Down Current V = 1V 32 m A CHRG CHRG V CHRG Pin Output Low Voltage I = 5mA 0.525 V CHRG CHRG R Thermistor Resistance for Hot Fault 3.7 4.1 4.4 kW HOT R Thermistor Resistance for Cold Fault 25 28.5 31 kW COLD 4050f 2 U W U U WWW