ACE45677D

Standalone 1A Linear Lithium Battery Charger With Thermal Regulation

VER 1.1

1

Description

The ACE45677D is a complete constant-current/ constant-voltage linear charger for single cell lithium

rechargeable battery. No external sense resistor is needed, and no blocking diode is required due to the

internal P-MOSFET architecture. Furthermore, the ACE45677D is specifically designed to work within

USB power specifications. Its low external component count makes the ACE45677D ideally suited for

portable applications. Thermal feedback regulates the charge current to limit the die temperatu re during

high power operation or high ambient temperature. The charge current can be programmed externally

with a single resistor. The ACE45677D automatically terminates the charge cycle when the charge

current drops to 1/10th the programmed value after the final float voltage is reached. When the input

supply (wall adapter or USB supply) is removed, the ACE45677D automatically enters a low power sleep

mode, dropping the battery drain current to less than 2

μA. The ACE45677D can be put into shutdown

mode, reducing the supply current to 50

μA. Other features include battery pack temperature monitor,

undervoltage lockout, automatic recharge and two status pins to indicate charging and charge termination.

The ACE45677D is available in thermally enhanced 8-pin SOP package.

Features

⚫

Charges Single Cell Lithium Battery Directly from USB Port or AC Adapter

⚫

Input Voltage Range From 4.5V to 6.5V

⚫

No External MOSFET, Sense Resistor or Blocking Diode Required

⚫

Preset 4.20V/4.35V Charge Voltage

⚫

Continuous Programmable Charge Current Up to 1A

⚫

Recharge Conditioning for Reviving Deeply Discharged Cells and Minimizing Heat Dissipation

During Initial Stage of Charge

⚫

Constant-Current/Constant- Voltage/Constant-Temp Operation with Thermal Regulation to Maximize

Charge Rate Without Risk of Overheating

⚫

Automatic Recharge

⚫

Battery Temperature Sensing

⚫

Charge state pairs of output, no battery and fault status display

⚫

Charge Current Monitor Output for Gas Gauging

⚫

Automatic Low Power Sleep Mode When Input Supply Voltage is Removed

⚫

Soft-Start Limits Inrush Current

⚫

Chip Enable Input

Application

⚫

Cellular phones, PDAs

⚫

Portable Media Players

⚫

Digital Still Cameras

⚫

Bluetooth & GPS Applications

⚫

Mobile Internet Device

⚫

Charging Docks and Cradles