LTC4081EDD#PBF

LTC4081 is a complete constant-current/constant-voltage linear battery charger for a single-cell 4.2V lithium-ion/polymer battery with an integrated 300mA synchronous buck converter. The low external component count make the device especially suitable for portable applications. Furthermore, this device is specifically designed to work within USB power specifications. The CHRG pin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal 4.5-hour timer terminates the charge cycle. The full featured device's battery charger also includes trickle charge, automatic recharge, soft-start (to limit inrush current) and an NTC thermistor input used to monitor battery temperature. It is used in applications such as wireless headsets, Bluetooth applications, portable MP3 players, multifunction wristwatches etc.

• Charge current programmable upto 500mA with 5% accuracy
• NTC thermistor input for temperature qualified charging
• C/10 charge current detection output, supply current in shutdown mode is 5µA
• Battery charger supply voltage from 3.75V to 5.5V
• Input voltage for the switching regulator from 2.7V to 4.8V
• Switching frequency is 2.25MHz typical at (TA = 25°C, VCC = 5V)
• Automatic shutdown threshold voltage is 82mV typical at (TA = 25°C, VCC = 5V)
• Trickle charge current is 50mA typical at (VBAT = 2V, RPROG = 0.8K)
• Operating temperature range from 0°C to 70°C
• Package style is 10-lead plastic DFN

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