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LTC4056-4.2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4056-4.2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC4056-4.2 1 405642f The LTC ®4056 is a low cost, single-cell, constant-current/ constant-voltage Li-Ion battery charger controller with a programmable termination timer. When combined with a few external components, the LTC4056 forms a very small standalone charger for single cell lithium-ion batteries. Charge current and charge time are set externally with a single resistor and capacitor, respectively. The LTC4056 charges to a final float voltage accurate to ±0.6%. Manual shutdown is accomplished by grounding the TIMER/ SHDN pin, while removing input power automatically puts the LTC4056 into a sleep mode. Both the shutdown and sleep modes drain near zero current from the battery; the shutdown mode reduces supply current to 40 µA. The output driver is both current limited and thermally protected to prevent operating outside of safe limits. No external blocking diode or sense resistor is required. The LTC4056 also includes low battery charge conditioning (trickle charging), undervoltage charge current limiting, automatic recharge and a charge status output. The LTC4056 is available in a low profile (1mm) 8-lead SOT-23 (ThinSOT TM) package. s Cellular Telephones s Handheld Computers s Digital Cameras s Charging Docks and Cradles s Low Cost and Small Size Chargers , LTC and LT are registered trademarks of Linear Technology Corporation. s Standalone Li-Ion Charger with Termination s Programmable Termination Timer s No Sense Resistor or Blocking Diode Required s Suitable for USB-Powered Charging s Undervoltage Charge Current Limiting s Preset Charge Voltage with ±0.6% Accuracy s Programmable Charge Current: 200mA to 700mA s Automatic Recharge with Shortened Charge Cycle s Self-Protection for Overcurrent/Overtemperature s 40 µA Supply Current in Shutdown Mode s Negligible Battery Drain Current in Shutdown s Low Battery Charge Conditioning (Trickle Charging) s CHRG Status Output including AC Present s PCB Total Solution Area only 75mm2 (700mA) s Low Profile (1mm) SOT-23 Package Linear Li-Ion Charger with Termination in ThinSOT VCC ISENSE CHRG VIN 4.5V TO 6.5V CHARGE STATUS DRIVE TIMER/SHDN BAT PROG GND 4056-4.2 TA01 1-CELL 4.2V Li-Ion 1 µF 1 µF 700mA ZXT1M322 1.3k LTC4056 + ThinSOT is a trademark of Linear Technology Corporation. VIN (V) 4.40 4.70 4056 TA02 4.50 4.60 800 700 600 500 400 300 200 100 0 4.45 4.55 4.65 4.75 CONSTANT CURRENT UNDERVOLTAGE CHARGE CURRENT LIMITING UNDERVOLTAGE LOCKOUT AT 4.35V VBAT = 4V RPROG = 1.3k ICHG = 700mA INPUT Z = 100m Ω VIN Undervoltage Charge Current Limiting DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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