Texas Instruments BQ2463X EVM, BQ2461X manual EVM Features, General Description, I/O Description

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1 Introduction

1.1EVM 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.

1.2General 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.

1.3I/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
			Power Good (active low)
		J–PG
		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

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