1 Features

• 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
• 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
  • 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 I_q
  • < 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.

1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

4 Revision History

Changes from A Revision (October 2011) to B Revision

• Changed Added Handling Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Device and Documentation Go
• Changed feature text From: "Supports 1-6 Battery Cells" To: "Supports 1S-6S Battery Cells"Go
• Changed the Application list Go
• Deleted the Table of Graphs from the Typical Characteristics section Go
• Changed the Description of D3, D4 in Table 4 From: "LED diode, green, 2.1 V, 10 mΩ, Vishay-Dale, WSL2010R0100F" To:"LED diode, green, 2.1 V, 20 mA, LTST-C190GKT"Go

Changes from * Revision (February 2010) to A Revision

• Changed descriptions of PH and BTST pins in Pin Description tableGo
• Changed V_HTF to V_TCO in two places in Equation 5Go
• Changed Equation 15Go