1 Features

• Enhanced EMI Performance
• Integrated Power FETs For Up To 2-A Charge Rate
• Suitable For 1-, 2-, or 3-Cell Li-Ion and Li-Polymer Battery Packs
• Synchronous Fixed-Frequency PWM Controller Operating at 1.1 MHz With 0% to 100% Duty Cycle
• High-Accuracy Voltage and Current Regulation
• Status Outputs For LED or Host Processor Interface Indicates Charge-In-Progress, Charge Completion, Fault, and AC-Adapter Present Conditions
• 20-V Absolute Maximum Voltage Rating on IN and OUT Pins
• Accurate High-Side Battery Current Sensing
• Battery Temperature Monitoring
• Automatic Sleep Mode for Low Power Consumption
• Reverse Leakage Protection Prevents Battery Drainage
• Thermal Shutdown and Protection
• Built-In Battery Detection
• Available in 20-pin 3.5-mm × 4.5-mm VQFN Package

2 Applications

• Handheld Products
• Portable Media Players
• Industrial and Medical Equipment
• Portable Equipment
• Portable DVD Players

3 Description

The bqSWITCHER™ series are highly integrated Li-ion and Li-polymer switched-mode charge management devices targeted at a wide range of portable applications. The bqSWITCHER™ series offers integrated synchronous PWM controller and power FETs, high-accuracy current and voltage regulation, charge preconditioning, charge status, and charge termination, in a small, thermally enhanced QFN package.

The bqSWITCHER charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on user-selectable minimum current level. A programmable charge timer provides a safety backup for charge termination. The bqSWITCHER automatically restarts the charge cycle if the battery voltage falls below an internal threshold. The bqSWITCHER automatically enters sleep mode when V_CC supply is removed.

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

Typical 1-Cell Application