The BQ25302 is a highly-integrated standalone switch-mode battery charger for single cell Li-Ion and Li-polymer batteries. The BQ25302 supports 4.1-V to 6.2-V input voltage and 2-A fast charge. The integrated current sensing topology of the device enables high charge efficiency and low BOM cost. The best-in-class 200-nA low quiescent current of the device conserves battery energy and maximizes the shelf time for portable devices. The BQ25302 is available in a 3x3 WQFN package for easy 2-layer layout and space limited applications.

The BQ25302supports 4.1-V to 6.2-V input to charge single cell batteries. The BQ25302 provides up to 2-A continuous fast charge current to a single cell battery. The device features fast charging for portable devices. Its input voltage regulation delivers maximum charging power to the battery from input source. The solution is highly integrated with an input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), and low-side switching FET (LSFET, Q3).

The BQ25302 features lossless integrated current sensing to reduce power loss and BOM cost with minimized component count. It also integrates a bootstrap diode for the high-side gate drive and battery temperature monitor to simplify system design. The device initiates and completes a charging cycle without host control. The BQ25302 charge voltage and charge current are set by external resistors. The BQ25302detects the charge voltage setting at startup and charges the battery in four phases: battery short, pre-conditioning, constant current, and constant voltage. At the end of the charging cycle, the charger automatically terminates if the charge current is below the termination current threshold and the battery voltage is above the recharge threshold. When the battery voltage falls below the recharge threshold, the charger will automatically start another charging cycle. The charger provides various safety features for battery charging and system operations, including battery temperature monitoring based on negative temperature coefficient (NTC) thermistor, charge safety timer, input over-voltage and over-current protections, as well as battery over-voltage protection. Pin open and short protection is also built in to protect against the charge current setting pin ICHG accidently open or short to GND. The thermal regulation regulates charge current to limit die temperature during high power operation or high ambient temperature conditions.

The STAT pin output reports charging status and fault conditions. When the input voltage is removed, the device automatically enters HiZ mode with very low leakage current from battery to the charger device. The BQ25302 is available in a 3 mm x 3 mm thin WQFN package.

• Standalone charger and easy to configure
• High-efficiency, 1.2-MHz, synchronous switch-mode buck charger
  • 94.3% charge efficiency at 1A from 5-V input
• Single input to support USB input
  • Support 4.1-V - 6.2-V input voltage range with 28-V absolute maximum input voltage rating
  • Input Voltage Dynamic Power Management (VINDPM) tracking battery voltage
• High integration
  • Integrated reverse blocking and synchronous switching MOSFET
  • Internal input and charge current sense
  • Internal loop compensation
  • Integrated bootstrap diode
• 4.1-V / 4.2-V / 4.35-V / 4.4-V charge voltage
• 2.0-A maximum fast charge current
• 200-nA low battery leakage current at 4.5-V VBAT
• 4-μA VBUS supply current in IC disable mode
• Charge current thermal regulation at 120°C
• Precharge current: 10% of fast charge current
• Termination current: 10% of fast charge current
• Charge accuracy
  • ±0.5% charge voltage regulation
  • ±10% charge current regulation
• Safety
  • Thermal regulation and thermal shutdown
  • Input Under-Voltage Lockout (UVLO) and Over-Voltage Protection (OVP)
  • Battery overcharge protection
  • Safety timer for precharge and fast charge
  • Charge disabled if current setting pin ICHG is open or short
  • Cold/hot battery temperature protection
  • Fault report on STAT pin
• Available in WQFN 3x3-16 package

• Number of series cells
• 1
• Charge current (Max) (A)
• 2
• Operating Vin (Max) (V)
• 6.2
• Cell chemistry
• Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4
• Battery charge voltage (Min) (V)
• 4.1
• Battery charge voltage (Max) (V)
• 4.4
• Absolute Vin (safety rating) (Max) ((V))
• 28
• Control interface
• Standalone (RC-Settable)
• Features
• BAT temp thermistor monitoring (hot/cold profile)
• Operating Vin (Min) (V)
• 4
• Rating
• Catalog

BQ25302的完整型号有：BQ25302RTER，以下是这些产品的关键参数及官网采购报价：

BQ25302RTER，工作温度：-40 to 85，封装：WQFN (RTE)-16，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BQ25302RTER的批量USD价格：.58（1000+）

BQ25302EVM — 具有可编程充电电压的独立单节 2A 降压电池充电器评估模块

BQ25302EVM 评估模块 (EVM) 用于评估 BQ25302 器件。这是一款高度集成的 2A 独立式单节电池、5V、1.2MHz 同步开关模式降压电池充电器，具有可编程的充电电压。