LTC1734L Lithium-Ion Linear Battery Charger in ThinSOT FEATURES DESCRIPTIO TM n Low Profile (1mm) ThinSOT Package The LTC 1734L is a low cost, single cell, constant-current/ n Programmable Charge Current: 50mA to 180mA constant-voltage Li-Ion battery charger controller. When n No Blocking Diode Required combined with a few external components, the SOT-23 n No Sense Resistor Required package forms a very small, low cost charger for single cell n 1% Accurate Preset Voltage: 4.2V lithium-ion batteries. The LTC1734L is a lower charge n Charge Current Monitor Output current version of the LTC1734. for Charge Termination The LTC1734L provides a fixed float voltage of 4.2V with n Automatic Sleep Mode with Input Supply Removal 1% accuracy (for 4.1V and 4.15V float voltages, contact n Manual Shutdown LTC Marketing). Constant current is programmed using a n Negligible Battery Drain Current in Shutdown single external resistor between the PROG pin and ground. n Undervoltage Lockout Manual shutdown is accomplished by floating the pro- n Self Protection for Overcurrent/Overtemperature gram resistor while removing input power automatically puts the LTC1734L into a sleep mode. Both the shutdown U and sleep modes drain near zero current from the battery. APPLICATIO S Charge current can be monitored via the voltage on the n Cellular Telephones PROG pin allowing a microcontroller or ADC to read the n Handheld Computers current and determine when to terminate the charge cycle. n Digital Cameras The output driver is both current limited and thermally n Charging Docks and Cradles protected to prevent the LTC1734L from operating outside n Low Cost and Small Size Chargers of safe limits. No external blocking diode is required. n Programmable Current Sources The LTC1734L can also function as a general purpose current source or as a current source for charging nickel- , LTC and LT are registered trademarks of Linear Technology Corporation. cadmium (NiCd) and nickel-metal-hydride (NiMH) batter- ThinSOT is a trademark of Linear Technology Corporation. ies using external termination. TYPICAL APPLICATIO PROG Pin Indicates Charge Status 5V V BAT 80mA Li-Ion Battery Charger 4V 31 V IN V I CC SENSE 5V 3V 1F LTC1734L 2 6 UMT4403 GND DRIVE CONSTANT CONSTANT CURRENT VOLTAGE I = 80mA 2V BAT 4 5 PROG BAT SINGLE 1.5V V + PROG 10F Li-Ion R PROG 1V BATTERY 4.7k 1734 TA01 0V CHARGING CHARGING BEGINS COMPLETE 1734 TA01b 1734lf 1 V (V) V (V) PROG BAT U ULTC1734L ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Input Supply Voltage (V ) ..........................0.3V to 9V CC ORDER PART Input Voltage (BAT, PROG) ........ 0.3V to (V + 0.3V) NUMBER CC TOP VIEW Output Voltage (DRIVE) .............. 0.3V to (V + 0.3V) CC LTC1734LES6-4.2 I 1 6 DRIVE SENSE Output Current (I ) ................................... 210mA SENSE GND 2 5 BAT Short-Circuit Duration (DRIVE) ...................... Indefinite V 3 4 PROG CC Junction Temperature.......................................... 125 C S6 PART MARKING S6 PACKAGE Operating Ambient Temperature Range 6-LEAD PLASTIC SOT-23 (Note 2) ...............................................40 C to 85 C LTE6 T = 125 C, q = 230 C/W JMAX JA Operating Junction Temperature (Note 2) ............ 100 C Storage Temperature Range ................. 65 C to 150 C Lead Temperature (Soldering, 10 sec).................. 300 C 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, unless otherwise noted specifications are at T = 25 C. V = 5V, GND = 0V and V is equal to the float voltage A CC BAT unless otherwise noted. All current into a pin is positive and current out of a pin is negative. All voltages are referenced to GND, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Supply CC V Input Supply Voltage (Note 5) l 4.55 8 V CC I Quiescent V Pin Supply Current V = 5V, (Forces I = I = 0), l 670 1150 m A CC CC BAT DRIVE BAT I = 200m A,(7500W from PROG to GND) PROG I V Pin Supply Current in Manual Shutdown PROG Pin Open l 450 900 m A SHDN CC I Battery Drain Current in Manual Shutdown PROG Pin Open l 1 0 1 m A BMS (Note 3) I Battery Drain Current in Sleep Mode (Note 4) V = 0V l 1 0 1 m A BSL CC V Undervoltage Lockout Exit Threshold V Increasing l 4.45 4.56 4.68 V UVLOI CC V Undervoltage Lockout Entry Threshold V Decreasing l 4.30 4.41 4.53 V UVLOD CC V Undervoltage Lockout Hysteresis V Decreasing 150 mV UVHYS CC Charging Performance V Output Float Voltage in Constant Voltage Mode I = 10mA, 4.55V V 8V l 4.158 4.20 4.242 V BAT BAT CC I Output Full-Scale Current When Programmed R = 7500W , 4.55V V 8V, l 39 50 60 mA BAT1 PROG CC for 50mA in Constant Current Mode Pass PNP Beta > 50 I Output Full-Scale Current When Programmed R = 2100W , 4.55V V 8V, l 160 180 200 mA BAT2 PROG CC for 180mA in Constant Current Mode Pass PNP Beta > 50 V Current Monitor Voltage on PROG Pin I = 10% of I , R = 7500W , 0.045 0.15 0.28 V CM1 BAT BAT1 PROG 4.55V V 8V, Pass PNP Beta > 50, CC 0 C T 85 C A V Current Monitor Voltage on PROG Pin I = 10% of I , R = 2100W , 0.10 0.15 0.20 V CM2 BAT BAT2 PROG 4.55V V 8V, Pass PNP Beta > 50, CC 0 C T 85 C A I Drive Output Current V = 3.5V l 20 mA DSINK DRIVE 1734lf 2 U W U U WWW