BQ2057W - 锂离子低压降线性 (8.4V) 充电管理 IC，用于具有 AutoCompTM 的两节应用领域

BQ2057W是TI德州仪器公司的一款电池充电器IC产品，BQ2057W是锂离子低压降线性 (8.4V) 充电管理 IC，用于具有 AutoCompTM 的两节应用领域，本站介绍了BQ2057W的封装应用图解、特点和优点、功能等，并给出了与BQ2057W相关的TI元器件型号供参考。

BQ2057W - 锂离子低压降线性 (8.4V) 充电管理 IC，用于具有 AutoCompTM 的两节应用领域 - 电池充电器IC - 电池管理产品 - 德州仪器

产品描述

The BENCHMARQ bq2057 series advanced Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Pol) linear charge-management ICs are designed for cost-sensitive and compact portable electronics. They combine high-accuracy current and voltage regulation, battery conditioning, temperature monitoring, charge termination, charge-status indication, and AutoComp charge-rate compensation in a single 8-pin IC. MSOP, TSSOP, and SOIC package options are offered to fit a wide range of end applications.

The bq2057 continuously measures battery temperature using an external thermistor. For safety, the bq2057 inhibits charge until the battery temperature is within user-defined thresholds. The bq2057 then charges the battery in three phases: conditioning, constant current, and constant voltage. If the battery voltage is below the low-voltage threshold, V(min), the bq2057 precharges using a low current to condition the battery. The conditioning charge rate is approximately 10% of the regulation current. The conditioning current also minimizes heat dissipation in the external pass-element during the initial stage of the charge. After conditioning, the bq2057 applies a constant current to the battery. An external sense-resistor sets the current. The sense-resistor can be on either the high or low side of the battery without additional components. The constant-current phase continues until the battery reaches the charge-regulation voltage.

The bq2057 then begins the constant-voltage phase. The accuracy of the voltage regulation is better than ±1% over the operating-temperature and supply-voltage ranges. For single and dual cells, the bq2057 is offered in four fixed-voltage versions: 4.1 V, 4.2 V, 8.2 V, and 8.4 V. Charge stops when the current tapers to the charge termination threshold, I(TERM). The bq2057 automatically restarts the charge if the battery voltage falls below the V(RCH) threshold.

The designer also may use the AutoComp feature to reduce charging time. This proprietary technique allows safe and dynamic compensation for the internal impedance of the battery pack during charge.

产品特性

Ideal for Single (4.1 V or 4.2 V) and Dual-Cell (8.2 V or 8.4 V) Li-Ion or Li-Pol Packs
Requires Small Number of External Components
0.3 V Dropout Voltage for Minimizing Heat Dissipation
Better Than ±1% Voltage Regulation Accuracy With Preset Voltages
AutoComp™ Dynamic Compensation of Battery Pack’s Internal Impedance to Reduce Charge Time
Optional Cell-Temperature Monitoring Before and During Charge
Integrated Voltage and Current Regulation With Programmable Charge-Current and High-or Low-Side Current Sensing
Integrated Cell Conditioning for Reviving Deeply Discharged Cells and Minimizing Heat Dissipation During Initial Stage Of Charge
Charge Status Output for Single or Dual Led or Host Processor Interface
Automatic Battery-Recharge Feature
Charge Termination by Minimum Current
Automatic Low-Power Sleep Mode When VCC Is Removed
EVMs Available for Quick Evaluation
Packaging: 8-Pin SOIC, 8-Pin TSSOP, 8-Pin MSOP

AutoComp is a trademark of Texas Instruments.

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