MAX8903B 2A 1节Li+电池DC-DC充电器，用于

The MAX8903B is integrated 1-cell Li+ chargers and Smart Power Selector™ with dual (AC adapter and USB) power inputs. The switch mode charger uses a high switching frequency to eliminate heat and allow tiny external components. It can operate with either separate inputs for USB and AC adapter power, or from a single input that accepts both. All power switches for charging and switching the load between battery and external power are included on-chip. No external MOSFETs, blocking diodes, or current-sense resistors are required.

The MAX8903B features optimized smart power control to make the best use of limited USB or adapter power. Battery charge current and SYS output current limit are independently set. Power not used by the system charges the battery. Charge current and SYS output current limit can be set up to 2A while USB input current can be set to 100mA or 500mA. Automatic input selection switches the system from battery to external power. The DC input operates from 4.15V to 16V with up to 20V protection, while the USB input has a range of 4.1V to 6.3V with up to 8V protection.

The MAX8903B internally block current from the battery and system back to the DC and USB inputs when no input supply is present. Other features include prequal charging and timer, fast charge timer, overvoltage protection, charge status and fault outputs, power-OK monitors, and a battery thermistor monitor. In addition, on-chip thermal limiting reduces battery charge rate and AC adapter current to prevent charger overheating. The MAX8903B is available in a 4mm x 4mm, 28-pin thin QFN package.

Efficient DC-DC Converter Eliminates Heat

4MHz Switching for Tiny External Components

Instant On—Works with No Battery or Low Battery

Dual Current-Limiting Input Circuits—AC Adapter or USB

• Automatic Adapter/USB/Battery Switchover to Support Load Transients
• 50mΩ System-to-Battery Switch
• Supports USB Spec

Thermistor Monitor

Integrated Current-Sense Resistor

No External MOSFETs or Diodes

4.1V to 16V Input Operating Voltage Range

应用/使用

移动互联网设备
PDA、掌上电脑和无线手持装置
个人导航设备
便携式多媒体播放器
智能蜂窝电话

Typical Operating Circuit