BATTERY VOLTAGE (V) LTC4068-4.2/LTC4068X-4.2 Standalone Linear Li-Ion Battery Charger with Programmable Termination FEATURES DESCRIPTIO Programmable Charge Current Up to 950mA The LTC 4068 is a complete constant-current/constant- Complete Linear Charger in DFN Package voltage linear charger for single cell lithium-ion batteries. No MOSFET, Sense Resistor or Blocking Diode Its DFN package and low external component count make Required the LTC4068 ideally suited for portable applications. Fur- Thermal Regulation Maximizes Charge Rate thermore, the LTC4068 is designed to work within USB Without Risk of Overheating* power specifications. Charges Directly from a USB Port No external sense resistor or external blocking diode are Programmable Charge Current Termination required due to the internal MOSFET architecture. Thermal Preset 4.2V Charge Voltage with 1% Accuracy feedback regulates the charge current to limit the die Charge Current Monitor Output for Gas Gauging* temperature during high power operation or high ambient Automatic Recharge temperature conditions. The charge voltage is fixed at Charge Status Output 4.2V and the charge current is programmed with a resis- AC Present Output tor. The LTC4068 terminates the charge cycle when the 2.9V Trickle Charge Threshold (LTC4068) charge current drops below the programmed termination Available Without Trickle Charge (LTC4068X) threshold after the final float voltage is reached. Soft-Start Limits Inrush Current When the input supply (wall adapter or USB supply) is Low Profile (3mm 3mm 0.75mm) DFN Package removed, the LTC4068 enters a low current state dropping U the battery drain current to less than 2A. Other features APPLICATIO S include charge current monitor, undervoltage lockout, Cellular Telephones, PDAs, MP3 Players automatic recharge and status pins to indicate charge Bluetooth Applications termination and the presence of adequate input voltage. , LTC and LT are registered trademarks of Linear Technology Corporation. Protected by U.S. Patents, including 6522118. TYPICAL APPLICATIO Complete Charge Cycle (750mAh Battery) 700 4.75 CONSTANT Single Cell Li-Ion Battery Charger with C/5 Termination CURRENT 600 4.50 CONSTANT 600mA VOLTAGE 500 4.25 V IN V BAT CC 4.5V TO 6.5V 400 4.00 LTC4068-4.2 1-CELL + CHRG 300 3.75 Li-Ion ITERM ACPR BATTERY EN PROG 200 V = 5V 3.50 825 CC = 40C/W GND JA 1F 1.65k R = 1.65k PROG 100 3.25 R = 825 406842 TA01 TERM T = 25C A 0 3.00 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 TIME (HOURS) 406842 TA02 406842fa 1 CHARGE CURRENT (mA) U ULTC4068-4.2/LTC4068X-4.2 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW Input Supply Voltage (V ) ....................... 0.3V to 10V ORDER PART CC NUMBER PROG, ITERM ................................ 0.3V to V + 0.3V CC ITERM 1 8 EN BAT ............................................................. 0.3V to 7V BAT 2 7 ACPR LTC4068EDD-4.2 CHRG, ACPR, EN ...................................... 0.3V to 10V 9 CHRG 3 6 V CC LTC4068XEDD-4.2 BAT Short-Circuit Duration .......................... Continuous GND 4 5 PROG BAT Pin Current ........................................................ 1A DD PART MARKING PROG Pin Current ................................................... 1mA DD PACKAGE 8-LEAD (3mm 3mm) PLASTIC DFN Maximum Junction Temperature .......................... 125C T = 125C, = 40C/W (NOTE 3) LBHZ JMAX JA Operating Temperature Range (Note 2) .. 40C to 85C EXPOSED PAD IS GROUND (PIN 9) LBQB MUST BE SOLDERED TO PCB Storage Temperature Range ................. 65C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The 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 4.25 6.5 V CC I Input Supply Current Charge Mode (Note 4), R = 10k 0.4 1 mA CC PROG Standby Mode (Charge Terminated) 200 500 A Shutdown Mode (EN = 5V, V < V 25 50 A CC BAT or V < V ) CC UV V Regulated Output (Float) Voltage 0C T 85C, 4.3V < V < 6.5V 4.158 4.2 4.242 V FLOAT A CC I BAT Pin Current R = 10k, Current Mode 92 100 105 mA BAT PROG R = 2k, Current Mode 465 500 535 mA PROG Standby Mode, V = 4.2V 2.5 6 A BAT Shutdown Mode (EN = 5V, V < V or 1 2 A CC BAT V < V ) CC UV Sleep Mode, V = 0V 1 2 A CC I Trickle Charge Current V < V , R = 2k (Note 5) 30 45 60 mA TRIKL BAT TRIKL PROG V Trickle Charge Threshold Voltage R = 10k, V Rising (Note 5) 2.8 2.9 3 V TRIKL PROG BAT V Trickle Charge Hysteresis Voltage R = 10k (Note 5) 80 mV TRHYS PROG V V Undervoltage Lockout Voltage From V Low to High 3.7 3.8 3.92 V UV CC CC V V Undervoltage Lockout Hysteresis 150 200 300 mV UVHYS CC V EN Pin Input Low Voltage 0.4 0.7 V EN(IL) V EN Pin Input High Voltage 0.7 1 V EN(IH) R EN Pin Pull-Down Resistor 1.2 2 5 M EN V V V Lockout Threshold V from Low to High 70 100 140 mV ASD CC BAT CC from High to Low 5 30 50 mV V CC I Charge Termination Current Threshold R = 1k 90 100 110 mA TERM TERM R = 5k 17.5 20 22.5 mA TERM V PROG Pin Voltage R = 10k, Current Mode 0.93 1 1.07 V PROG PROG V CHRG Pin Output Low Voltage I = 5mA 0.35 0.6 V CHRG CHRG V ACPR Pin Output Low Voltage I = 5mA 0.35 0.6 V ACPR ACPR V Recharge Battery Threshold Voltage V V , 0C T 85C 60 100 140 mV RECHRG FLOAT RECHRG A 406842fa 2 U WWW