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.

• 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

• Number of series cells
• 1
• Charge current (Max) (A)
• 2
• Operating Vin (Max) (V)
• 16
• Cell chemistry
• Li-Ion/Li-Polymer
• Battery charge voltage (Min) (V)
• 4.2
• Battery charge voltage (Max) (V)
• 4.2
• Absolute Vin (safety rating) (Max) ((V))
• 20
• Control interface
• Standalone (RC-Settable)
• Features
• BAT temp thermistor monitoring (hot/cold profile), Input OVP
• Operating Vin (Min) (V)
• 4.35
• Rating
• Catalog

BQ24120的完整型号有：BQ24120RHLR、BQ24120RHLT，以下是这些产品的关键参数及官网采购报价：

BQ24120RHLR，工作温度：-40 to 85，封装：VQFN (RHL)-20，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ24120RHLR的批量USD价格：1.98（1000+）

BQ24120RHLT，工作温度：-40 to 85，封装：VQFN (RHL)-20，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ24120RHLT的批量USD价格：2.376（1000+）

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