MAX8856 由USB/AC适配器为单节Li+电池充电,为

MAX8856 USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN

MAX8856 由USB/AC适配器为单节Li+电池充电,为手持设备提供快速充电器件

The MAX8856 complete 1-cell Li+ battery charge-management IC operates from either a USB port or AC adapter. It integrates a battery disconnect switch, current-sense circuit, PMOS pass element, and thermal-regulation circuitry, while eliminating the external reverse-blocking Schottky diode, to create a simple and small charging solution. The charging sequence initiates from power-OK indication, through prequalification, fast-charge, top-off charge, and finally charging-complete indication for single-cell Li+ batteries. Charging is controlled using constant current, constant voltage, or constant die-temperature (CCCVCT_J) regulation for safe operation in handhelds.

Two logic inputs (active-low EN1, active-low EN2) select suspend mode, 100mA, 500mA, or ≤ 1A input current limits to comply with USB requirements. Proprietary thermal-regulation circuitry limits the die temperature to +100°C to prevent excessive heat on the system PC board. Additional safety features include an NTC thermistor input (THM) to protect the battery. A 3.5V to 4.2V SYS output, in conjunction with the low-R_DSON battery switch, powers the system even when the battery is deeply discharged or not installed. The IC also offers a +3.3V/500µA output (V_L), a charging status flag (active-low CHG), and an input-supply detection flag (active-low POK). The MAX8856 operates from a +4.25V to +5.5V supply and includes undervoltage lockout below +3.4V and overvoltage protection up to +14V.

关键特性

Small, 3mm x 3mm Thermally Enhanced TDFN Package (0.8mm max height)

USB-Compliant Suspend Mode (20µA)

Selectable 100mA, 500mA, and Up to 1A Input Current Limits

USB or AC Adapter Input

+6V to +14V Input Overvoltage Protection

Input UVLO Below +4V Rising (3.5V Falling)

Automatic Current Sharing Between Battery Charging and System

Die Temperature Regulation (+100°C)

Low Dropout Voltage, 250mV at 0.5A

NTC Thermistor Input

Charge Status and Input-Supply Detection Flags

应用/使用

蜂窝电话、智能电话、PDA
	数码相机、MP3播放器
	USB配件, 充电架和坞站

电池充电ACUSBLiLinear

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