1 Features

1• 1.2-MHz NMOS-NMOS Synchronous Buck

Converter

• Stand-Alone Charger Support for Li-Ion or Li-

Polymer

• 5-V – 28-V VCC Input Voltage Range and

Supports 1S-6S Battery Cells

• Up to 10-A Charge Current and Adapter Current Li•

High-Accuracy Voltage and Current Regulation

– ±0.5% Charge-Voltage Accuracy

– ±3% Charge-Current Accuracy

• Integration

– Internal Loop Compensation

– Internal Soft Start

• Safety

– Input Overvoltage Protection

– Battery Thermistor Sense Hot/Cold Charge

Suspend low–

Battery Detection

– Built-In Safety Timer

– Charge Overcurrent Protection

– Battery Short Protection

– Battery Overvoltage Protection

– Thermal Shutdown

• Status Outputs

– Adapter Present

– Charger Operation Status

• Charge Enable Pin

• 6-V Gate Drive for Synchronous Power Converter

• 30-ns Driver Dead-Time and 99.5% Max. Effective

Duty Cycle

• 16-Pin 3.5-mm × 3.5-mm QFN package

• Energy Star Low Quiescent Current Iq

– < 15-μA Off-State Battery Discharge Current

– < 1.5-mA Off-State Input Quiescent Current

2 Applications

• Portable Equipment Handle Terminals

• Industrial and Medical Equipment

• Power Tools Appliance

• Mobile Internet Device, and Ultra-Mobile PC

3 Description

The bq24600 is a highly integrated Li-ion or Li•

polymer switch-mode battery-charge controller. It

offers a constant-frequency synchronous PWM controller with high-accuracy charge current and

voltage regulation, charge preconditioning,

termination, and charge status monitoring,

The bq24600 charges the battery in three phases:

preconditioning, constant current, and constant

voltage. Charge is terminated when the current reaches a minimum level. An internal charge timer

provides a safety backup. The bq24600 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.