深圳市中立信电子科技有限公司

1 Features 2 Applications

1• Enhanced EMI Performance • Handheld Products

• Integrated Power FETs For Up To 2-A Charge • Portable Media Players

Rate • Industrial and Medical Equipment

• Suitable For 1-, 2-, or 3-Cell Li-Ion and Li-Polymer • Portable Equipment

Battery Packs • Portable DVD Players

• Synchronous Fixed-Frequency PWM Controller

Operating at 1.1 MHz With 0% to 100% Duty 3 Description

Cycle The bqSWITCHER™ series are highly integrated Li•

High-Accuracy Voltage and Current Regulation ion and Li-polymer switched-mode charge

management devices targeted at a wide range of • Status Outputs For LED or Host Processor

portable applications. The bqSWITCHER™ series Interface Indicates Charge-In-Progress, Charge offers integrated synchronous PWM controller and Completion, Fault, and AC-Adapter Present

power FETs, high-accuracy current and voltage Conditions regulation, charge preconditioning, charge status, and

• 20-V Absolute Maximum Voltage Rating on IN and charge termination, in a small, thermally enhanced

OUT Pins QFN package.

• Accurate High-Side Battery Current Sensing The bqSWITCHER charges the battery in three

• Battery Temperature Monitoring phases: conditioning, constant current, and constant

voltage. Charge is terminated based on user- • Automatic Sleep Mode for Low Power

selectable minimum current level. A programmable Consumption charge timer provides a safety backup for charge

• Reverse Leakage Protection Prevents Battery termination. The bqSWITCHER automatically restarts

Drainage the charge cycle if the battery voltage falls below an

• Thermal Shutdown and Protection internal threshold. The bqSWITCHER automatically

enters sleep mode when VCC supply is removed. • Built-In Battery Detection