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, 2, 3
• Charge current (Max) (A)
• 2
• Operating Vin (Max) (V)
• 16
• Cell chemistry
• Li-Ion/Li-Polymer
• Battery charge voltage (Min) (V)
• 4.2, 8.4
• Battery charge voltage (Max) (V)
• 4.2, 8.4
• 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

BQ24123的完整型号有：BQ24123RHLR、BQ24123RHLT，以下是这些产品的关键参数及官网采购报价：

BQ24123RHLR，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BQ24123RHLR的批量USD价格：1.98（1000+）

BQ24123RHLT，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BQ24123RHLT的批量USD价格：2.376（1000+）

BQ24123EVM-002 — bq24123 Evaluation Module

The bq24123EVM-002 provides a convenient method for evaluating the performance of a charge management solution for portable applications using the bq24123. The charger can deliver up to 2A of continuous output current and is programmed from the factory to deliver 1.33A of charging (...)

TEMPSENSE-SW — 温度传感设计软件

The TempSense Designer software allows the user to easily design temperature sensing circuits for many of the Texas Instruments battery charger devices. A full listing of the supported devices is included under the "Support" menu in the program. The user can use the thermisters included in the (...)