BATTERY VOLTAGE (V) LTC4054-4.2/LTC4054X-4.2 Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT FEATURES DESCRIPTIO n Programmable Charge Current Up to 800mA The LTC 4054 is a complete constant-current/constant- n No MOSFET, Sense Resistor or Blocking voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count Diode Required TM n make the LTC4054 ideally suited for portable applications. Complete Linear Charger in ThinSOT Package for Furthermore, the LTC4054 is specifically designed to work Single Cell Lithium-Ion Batteries n within USB power specifications. Constant-Current/Constant-Voltage Operation with Thermal Regulation* to Maximize Charge Rate No external sense resistor is needed, and no blocking Without Risk of Overheating diode is required due to the internal MOSFET architecture. n Charges Single Cell Li-Ion Batteries Directly Thermal feedback regulates the charge current to limit the from USB Port die temperature during high power operation or high n Preset 4.2V Charge Voltage with 1% Accuracy ambient temperature. The charge voltage is fixed at 4.2V, n Charge Current Monitor Output for Gas and the charge current can be programmed externally with Gauging* a single resistor. The LTC4054 automatically terminates n Automatic Recharge the charge cycle when the charge current drops to 1/10th n Charge Status Output Pin the programmed value after the final float voltage is n C/10 Charge Termination reached. n 25A Supply Current in Shutdown When the input supply (wall adapter or USB supply) is n 2.9V Trickle Charge Threshold (LTC4054) removed, the LTC4054 automatically enters a low current n Available Without Trickle Charge (LTC4054X) state, dropping the battery drain current to less than 2A. n Soft-Start Limits Inrush Current The LTC4054 can be put into shutdown mode, reducing n Available in 5-Lead SOT-23 Package the supply current to 25A. U APPLICATIO S Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate n Cellular Telephones, PDAs, MP3 Players charge termination and the presence of an input voltage. n Charging Docks and Cradles , LTC and LT are registered trademarks of Linear Technology Corporation. n Bluetooth Applications ThinSOT is a trademark of Linear Technology Corporation. *U.S.Patent No. 6,522,118 Complete Charge Cycle (750mAh Battery) TYPICAL APPLICATIO 700 4.75 CONSTANT CURRENT 600mA Single Cell Li-Ion Charger 600 4.50 CONSTANT CONSTANT V POWER IN 500 VOLTAGE 4.25 4.5V TO 6.5V 400 4.00 1F 4 300 3.75 V 3 CC BAT 600mA 200 3.50 LTC4054-4.2 5 V = 5V CC PROG 4.2V = 130C/W JA 100 3.25 Li-Ion CHARGE GND R = 1.65k PROG 1.65k BATTERY TERMINATED T = 25C A 2 0 3.00 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 405442 TA01a TIME (HOURS) 405442 TAO1b 405442xf 1 CHARGE CURRENT (mA) U ULTC4054-4.2/LTC4054X-4.2 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) Input Supply Voltage (V ) ....................... 0.3V to 10V ORDER PART CC TOP VIEW NUMBER PROG............................................. 0.3V to V + 0.3V CC BAT .............................................................. 0.3V to 7V CHRG 1 5 PROG LTC4054ES5-4.2 CHRG........................................................ 0.3V to 10V GND 2 LTC4054XES5-4.2 BAT 3 4 V BAT Short-Circuit Duration .......................... Continuous CC BAT Pin Current ................................................. 800mA S5 PACKAGE S5 PART MARKING 5-LEAD PLASTIC TSOT-23 PROG Pin Current ................................................ 800A T = 125C, ( = 80C/ W TO Maximum Junction Temperature .......................... 125C JMAX JA LTH7 150C/W DEPENDING ON PC BOARD LAYOUT) Operating Ambient Temperature Range (N0TE 3) LTADY (Note 2) .............................................. 40C to 85C Storage Temperature Range ................. 65C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. Lead Temperature (Soldering, 10 sec).................. 300C ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. V = 5V, unless otherwise noted. A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Supply Voltage l 4.25 6.5 V CC I Input Supply Current Charge Mode (Note 4), R = 10k l 300 2000 A CC PROG Standby Mode (Charge Terminated) l 200 500 A Shutdown Mode (R Not Connected, l 25 50 A PROG V < V , or V < V ) CC BAT CC UV V Regulated Output (Float) Voltage 0C T 85C, I = 40mA 4.158 4.2 4.242 V FLOAT A BAT I BAT Pin Current R = 10k, Current Mode l 93 100 107 mA BAT PROG R = 2k, Current Mode l 465 500 535 mA PROG Standby Mode, V = 4.2V l 0 2.5 6 A BAT Shutdown Mode (R Not Connected) 1 2 A PROG Sleep Mode, V = 0V 1 2 A CC I Trickle Charge Current V < V , R = 2k (Note 5) l 20 45 70 mA TRIKL BAT TRIKL PROG V Trickle Charge Threshold Voltage R = 10k, V Rising (Note 5) 2.8 2.9 3.0 V TRIKL PROG BAT V Trickle Charge Hysteresis Voltage R = 10k (Note 5) 60 80 110 mV TRHYS PROG V V Undervoltage Lockout Threshold From V Low to High l 3.7 3.8 3.92 V UV CC CC V V Undervoltage Lockout Hysteresis l 150 200 300 mV UVHYS CC V Manual Shutdown Threshold Voltage PROG Pin Rising l 1.15 1.21 1.30 V MSD PROG Pin Falling l 0.9 1.0 1.1 V V V V Lockout Threshold Voltage V from Low to High 70 100 140 mV ASD CC BAT CC V from High to Low 5 30 50 mV CC I C/10 Termination Current Threshold R = 10k (Note 6) l 0.085 0.10 0.115 mA/mA TERM PROG R = 2k l 0.085 0.10 0.115 mA/mA PROG V PROG Pin Voltage R = 10k, Current Mode l 0.93 1.0 1.07 V PROG PROG I CHRG Pin Weak Pull-Down Current V = 5V 8 20 35 A CHRG CHRG V CHRG Pin Output Low Voltage I = 5mA 0.35 0.6 V CHRG CHRG V Recharge Battery Threshold Voltage V - V 100 150 200 mV RECHRG FLOAT RECHRG 405442xf 2 U WWW