LTC4064 Monolithic Linear Charger for Back-Up Li-Ion Batteries FEATURES DESCRIPTIO The LTC4064 is a standalone linear charger optimized for Preset 4V Charge Voltage with 1% Accuracy prolonging the life of 1-cell Li-ion batteries in battery back- Prolongs 4.2V Li-Ion Battery Lifetime up applications. By charging to a float voltage of 4V Automatic Recharge instead of 4.2V or 4.1V, the LTC4064 decelerates the aging Thermal Regulation Maximizes Charging Rate process and capacity degradation when the battery is without Risk of Overheating* unused for long periods of time but must be in a ready No MOSFET, Sense Resistor or Blocking Diode state. Required Programmable Charge Termination Timer An external capacitor programs a safety timer to terminate Thermistor Input for Temperature Qualified Charging the charge cycle while the charge current is set externally Programmable Charge Current with 7% Accuracy with a single resistor. When the input supply is removed, C/10 Charge Current Detection Output the LTC4064 automatically enters a low current sleep 25A Supply Current in Shutdown Mode mode, dropping the battery drain current to less than 3A. Charge Current Monitor Useful for Gas Gauging* Additional safety features designed to maximize battery Charges Directly from USB Port lifetime and reliability include NTC temperature sensing Tiny Thermally Enhanced 10-pin MSOP Package and low battery charge conditioning (trickle charging). U The IC contains an on-chip power MOSFET and eliminates APPLICATIO S the need for an external sense resistor and blocking diode. The LTC4064 also includes C/10 detection circuitry, AC File Servers, RAID Systems present logic, and fault detection circuitry. Storage Products , LTC and LT are registered trademarks of Linear Technology Corporation. Li-Ion Battery Back-Up *US Patent No. 6522118 TYPICAL APPLICATIO Standalone Back-Up Li-Ion Battery Charger V = 5V IN 8 2 SHDN V CC I = 1A BAT 9 BAT V = 4V 4.7F FLOAT LTC4064 4 7 PROG 1-CELL TIMER Li-Ion GND NTC 1.5k BATTERY* 1% 0.1F 5, 11 6 4064TA01 *AN OUTPUT CAPACITOR MAY BE REQUIRED DEPENDING ON BATTERY LEAD LENGTH sn4064 4064fs 1 U ULTC4064 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) ORDER PART Input Supply Voltage (V ) ..................................... 10V CC TOP VIEW CHRG 1 10 ACPR NUMBER BAT ......................................................................... 10V V 2 9 BAT CC NTC, SHDN, TIMER, PROG ............ 0.3V to V + 0.3V FAULT 3 8 SHDN CC 11 LTC4064EMSE TIMER 4 7 PROG CHRG, FAULT, ACPR ................................ 0.3V to 10V GND 5 6 NTC BAT Short-Circuit Duration .......................... Continuous MSE EXPOSED PAD PACKAGE 10-LEAD PLASTIC MSOP MSE PART MARKING BAT Current (Note 2) ............................................. 1.3A T = 125C, = 40C/W (Note 4) JMAX JA PROG Current (Note 2) ....................................... 1.3mA EXPOSED PAD IS GND, (PIN 11) LTAHQ MUST BE SOLDERED TO PCB Junction Temperature.......................................... 125C Operating Temperature Range (Note 3) ...40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Storage Temperature Range ................ 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. V = 5V A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V V Supply Voltage 4.25 6.5 V CC CC I V Supply Current Charger On Current Mode R = 30k (Note 5) 12 mA CC CC PROG Shutdown Mode V = 0V 25 50 A SHDN Sleep Mode V < V or V 4V 25 50 A CC BAT CC V V Regulated Float Voltage 3.96 4.00 4.04 V FLOAT BAT I Battery Pin Current R = 3k Current Mode 465 500 535 mA BAT PROG R = 15k Current Mode 93 100 107 mA PROG Shutdown Mode V = 0V 1 3 A SHDN Sleep Mode V < V or V < (V V ) 1 3 A CC BAT CC UV UV I Trickle Charge Current V < 2V R = 3k 35 50 65 mA TRIKL BAT PROG V Trickle Charge Trip Threshold Voltage V Rising 2.48 V TRIKL BAT V Trickle Charge Trip Hysteresis Voltage 100 mV TRIKL V V Undervoltage Lockout Voltage V Rising 4 4.25 V UV CC CC V V Undervoltage Lockout Hysteresis 200 mV UV CC V Manual Shutdown Threshold Voltage SHDN Pin Voltage 0.6 1.3 V MSD V Automatic Shutdown Threshold Voltage (V - V ) High to Low 35 mV ASD CC BAT (V - V ) Low to High 70 mV CC BAT sn4064 4064fs 2 U WWW