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1 introduction, 1 evm features, 2 general description – Texas Instruments BQ2461X User Manual

Page 2: 3 i/o description

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Introduction

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1

Introduction

1.1

EVM Features

Evaluation Module For bq2461x/bq2463x

High Efficiency Synchronous Buck Charger

User-programmable up to 26V Battery Voltage

AC Adapter Operating Range 5 V–28 V

LED Indication for Control and Status Signals.

Test Points for Key Signals Available for Testing Purpose. Easy Probe Hook-up.

Jumpers Available. Easy to Change Connections.

1.2

General Description

The bq2461x is highly integrated Li-ion or Li-polymer switch-mode battery charge controllers. The
bq2463x is highly integrated switch-mode battery charge controllers designed specifically to charge
Lithium Phosphate battery chemistries.

They offer a constant-frequency synchronous PWM controller with high accuracy charge current and
voltage regulation, adapter current regulation, termination, charge preconditioning, and charge status
monitoring,

The bq2461x/bq2463x charges the battery in three phases: preconditioning, constant current, and
constant voltage. Charge is terminated when the current reches a minimum user-selectable level. A
programmable charge timer provides a safety backup for charge termination. The bq2461x/bq2463x
automatically restarts the charge cycle if the battery voltage falls below an internal threshold, and enters a
low-quiescent current sleep mode when the input voltage falls below the battery voltage.

The dynamic power management (DPM) function modifies the charge current depending on system load
conditions, avoiding ac adapter overload.

High accuracy current sense amplifiers enable accurate measurement of the ac adapter current, allowing
monitoring of overall system power.

For details, see bq24610 and bq24617 (

SLUS892

), bq24616 (

SLUSA49

) and bq2463x (

SLUS894

) data

sheets.

1.3

I/O Description

Table 1. I/O Description

Jack

Description

J1–DCIN

AC adapter, positive output

J1–GND

AC adapter, negative output

J2–VEXT

External power supply, positive output

J2–GND

External power supply, negative output

J2–TTC

Timer capacitor pin

J3–ACSET

Input current program pin

J3–ISET1

Charge Current Program Pin

J3–ISET2

Pre-charge/Termination program pin

J3–GND

Ground

J–PG

Power Good (active low)

J4–CHGEN

Charge enable

J4–VREF

IC reference voltage VREF

J4–TS

Temperature Qualification Voltage Input

J5–VSYS

Connected to system

J5–VBAT

Connected to battery pack

2

bq2461x/bq2463x EVM (HPA422) Multi-Cell Synchronous Switch-Mode Charger

SLUU396A – January 2010 – Revised July 2010

Copyright © 2010, Texas Instruments Incorporated

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