Datasheet

Introduction

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1 Introduction

1.1 bq2427x IC Features

The bq24270/271 integrates a synchronous PWM controller, power MOSFETs, input-current sensing,

high-accuracy current and voltage regulation, charge termination, and power path management into a

QFN package. The charge parameters can be programmed through an I

C interface. Key integrated circuit

(IC) features include:

• High-efficiency, fully integrated, NMOS-NMOS, synchronous buck charger with 1.5-MHz frequency

• Integrated power FETs for up to 1.5-A charge rate

• Power path management between battery and system voltages

For details, see the bq24270/271 data sheet (SLUSB10).

1.2 bq24270/271EVM Features

The bq24270/271EVM evaluation module (EVM) is a complete charger module for evaluating compact,

flexible, high-efficiency, USB-friendly, switch-mode battery charge. The module also evaluates power path

management solutions for single-cell, Li-ion and Li-polymer battery-powered systems used in a wide range

of portable applications. Key EVM features include:

• Input power connector for USB input

• Programmable battery voltage, charge current, input current, and status via I

C™ interface

• USB operating range of 4.2 V – 6 V

• LED indication for status signals

• Test points for key signals available for testing purposes. Easy probe hook-up

QFN-Packaged bq24270/271 Evaluation Modules SLUU924–April 2012

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