General Description

The MAX1874 charges a single-cell Li+ battery from both USB and AC adapter sources. It also includes battery-to-input power switchover, so the system can be powered directly from the power source rather than from the battery.

In its simplest application, the MAX1874 needs no external MOSFET or diodes, and accepts input voltages up to 6.5V; however, DC input overvoltage protection up to 18V can be added with a single SOT PFET. On-chip thermal limiting simplifies printed circuit board (PCB) layout and allows optimum charging rate without the thermal limits imposed by worst-case battery and input voltage. When the MAX1874 thermal limit is reached, the charger does not shut down but simply reduces charging current.

Ambient or battery temperature can be monitored with an external thermistor. When the temperature is out of range, charging pauses.

The MAX1874 contains no logic for communication with the USB host. It must receive instructions from a local microcontroller. The MAX1874 is available in a 16-pin 5mm ✕ 5mm thin QFN package and operates over the -40°C to +85°C temperature range.

Features

♦ Charge from USB or AC Adapter

♦ Automatic Switchover to AC Adapter

♦ Thermal Limiting Simplifies Board Design

♦ Small, High-Power 16-Pin Thin QFN Package

♦ Input Protection Up to 18V

♦ Soft-Start

♦ Automatic Battery-to-Input Load Switch

Applications

   PDAs

   Cell Phones

   Wireless Appliances

   Digital Cameras