LTC4056

Features:

· Standalone Li-Ion Charger with Termination
· Programmable Termination Timer
· No Sense Resistor or Blocking Diode Required
· Suitable for USB-Powered Charging
· Undervoltage Charge Current Limiting
· Preset Charge Voltage with ±0.6% Accuracy
· Programmable Charge Current: 200mA to 700mA
· Automatic Recharge
· Self-Protection for Overcurrent/Overtemperature
· 40mA Supply Current in Shutdown Mode
· Negligible Battery Drain Current in Shutdown
· Low Battery Charge Conditioning (Trickle Charging)
· CHRG Status Output including AC Present Sense
· Low Profile (1mm) ThinSOTTM Package
· PCB Total Solution Area only 75mm² (700mA)


Application

· Cellular Telephones
· Handheld Computers
· Digital Cameras
· Charging Docks and Cradles
· Low Cost and Small Size Chargers


Pinout




Specifications

Input Supply Voltage (V_CC) ....................0.3V to 10V
BAT, CHRG ..............................................0.3V to 10V
DRIVE, PROG, TIMER/SHDN ....... 0.3V to (V_CC + 0.3V)
Output Current (I_SENSE) .................................. 900mA
Short-Circuit Duration (BAT, I_SENSE) ...........Continuous
Junction Temperature ....................................... 125
Operating Ambient Temperature Range
(Note 2) .............................................. 40 to 85
Storage Temperature Range ............ 65 to 150
Lead Temperature (Soldering, 10 sec)............. 300


Description

The LTC®4056 is a low cost, single-cell, constant-current/ onstant-voltage Li-Ion battery charger controller with a rogrammable termination timer. When combined with a ew external components, the LTC4056 forms a very small tandalone charger for single cell lithium-ion batteries.

harge current and charge time are set externally with a ingle resistor and capacitor, respectively. The LTC4056 harges to a final float voltage accurate to ±0.6%. Manual hutdown is accomplished by grounding the TIMER/ HDN pin, while removing input power automatically puts he LTC4056 into a sleep mode. Both the shutdown and leep modes drain near zero current from the battery and he shutdown mode reduces supply current to 40A.

The output driver is both current limited and thermally rotected to prevent operating outside of safe limits. No xternal blocking diode or sense resistor is required. The TC4056 also includes low battery charge conditioning trickle charging), undervoltage charge current limiting, utomatic recharge and a charge status output.

The LTC4056 is available in a low profile (1mm) 8-lead hinSOT package.