4.5A Synchronous Buck Li-ion Charger

DESCRIPTION

is a 4.5A Li-Ion battery charger. It utilizes a 500 KHz synchronous buck

converter topology to reduce power dissipation during charging. Low power

dissipation, an internal MOSFET allow a physically small charger that can be

embedded in a wide range of handheld applications. The

includes complete

charge termination circuitry, automatic recharge and a ±1% 4.2V float voltage.Battery

charge current, charge timeout and end-of-charge indication parameters are set with

external components. Additional features include shorted cell detection; temperature

qualified charging and overvoltage protection. The

is available in a ESOP8 and

DFN10 package

FEATURES



Input voltage range 4V~22V



Dynamic input current allocation for maximum charging rate



4.5A Maximum Charge Current



No External MOSFETs and Blocking Diode Required



Efficiency up to 95%



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

Maximize Charge Rate Without Risk of Overheating



Optional Battery Temperature Monitoring Before and During Charge Automatic

Sleep Mode for Low-Power



Over Current ProtectionH



Consumption Available in ESOP8 and DFN10



RoHS Compliant and 100% Lead (Pb)-Free

APPLICATIONS

Portable Media Players

Cellular and Smart mobile phone

PDA/DSC

Handheld Battery-Powered Devices

Handheld Computers

Charging Docks and Cradles

PACKAGE AND APPLICATION

- 1 -

HM5081