28V Linear Li+ Battery Charger with Smart Autoboot Assistant

The MAX8814 intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated linear charger is designed for charging a single-cell lithium-ion (Li+) battery.

The MAX8814 controls the charging sequence from the prequalification state through constant-current fast-charge and the final constant voltage charge. The IC achieves high flexibility by providing an adjustable fast-charge current through an external resistor. It also features a booting assistant circuit that distinguishes input sources and battery connection, and provides an output signal (ABO) for system booting.

The device operates over the extended temperature range (-40°C to +85°C), and is available in an 8-pin thermally enhanced 2mm x 2mm TDFN package (0.8mm max height).

Applications

* Bluetooth® Equipment * Cellular and Cordless Phones * Charging Cradles and Docks * Digital Still Cameras * MP3 Players * Smartphones and PDAs * USB Appliances

* Reduces External Components and Total Cost

* Integrated Current-Sensing Circuit, MOSFET Pass Element, and Thermally Regulation Circuitry

* No Reverse Blocking Diode Required

* Guarantees Safe and Accurate Battery Charging

* Proprietary Die Temperature Regulation Control (+115°C) Allows Maximum Charging Current Without Damaging the IC

* 4.25V to 28V Input Voltage Range with Over-Voltage Protection Above +7V to Protect Against Unqualified or Faulty AC Adapters

* Soft-Start Limits Inrush Current

* Integrated System Features for Compact Designs

* Programmable Fast-Charge Current: 1ARMS Max

* Charge-Current Monitor for Fuel Gauging (ISET)

* Input Power-Source Detection Output (Active-Low POK) and Charge-Enable Input (Active-Low EN)

* Output for Autobooting (ABO)

* Reduce Power Dissipation

* Low Dropout Voltage (300mV at 500mA)