BQ24120

具有增强的 EMI 性能的同步开关模式锂离子充电器，1 节电池

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 VCC supply is removed.

.

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