Datasheet

Introduction

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1 Introduction

1.1 EVM Features

• Evaluation module for bq24171 and bq24172

• Stand-alone synchronous switch-mode, battery-charge

• Integrated N-MOSFETs and power path selector

• Resistor-programmable up to 12.6-V battery voltage

• Input operating range: 4.5 V–16 V

• LED indication for charge status

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

• Jumpers available; easy-to-change setting

1.2 General Description

The bq24171 and bq24172 are highly integrated stand-alone Li-ion and Li-polymer switch-mode,

battery-charge with two integrated N-channel power MOSFETs and power path selector gate driver. They

offer a constant-frequency synchronous PWM controller with high-accuracy regulation of input current,

charge current and voltage. They also provide battery detection, preconditioning, charge termination, and

charge status monitoring. Additionally, the bq2471 monitors the battery pack temperature and allows

change only in a JEITA profile compatible window with lower change current at a low temperature and a

lower change voltage at a high temperature.

The bq24171 and bq24172 automatically enter a low-quiescent-current sleep mode when the input voltage

falls below the battery voltage. The bq24171 and bq24172 are adjustable for up to three series Li+ cells,

supporting up to a 4-A charge current. The bq24171 and bq24172 are available in a 24-pin, 3.5-mm x

5.5-mm

, thin QFN package.

For details, see the bq24171 data sheet (SLUSAF2). , and the bq24172 data sheet (SLUSAD2).

1.3 I/O Description

Table 1. I/O Description

Jack Description

J1–VIN Positive input

J1–PGND Negative input

J2–VSYS Connected to system

J2–VBAT Connected to charger output

J2–PGND Ground

J2–TS_EXT Temperature qualification voltage Input

bq24171EVM JEITA Compliant and bq24172EVM Stand-Alone Synchronous, SLUU462A–November 2010–Revised February 2011

Switch-Mode, Battery-Charge With Integrated N-MOSFETs and Power Path

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