BQ2057CSNG4 Datasheet

PMIC - Battery Management


The BENCHMARQ BQ2057CSNG4 series advanced Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Pol) linear charge-management ICs are designed for costsensitive 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 BQ2057CSNG4 continuously measures battery temperature using an external thermistor. For safety, the BQ2057CSNG4 inhibits charge until the battery temperature is within user-defined thresholds. The BQ2057CSNG4 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 BQ2057CSNG4 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 passelement during the initial stage of the charge. After conditioning, the BQ2057CSNG4 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. BQ2057CSNG4 Features • 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 Highor 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


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Manufacturer information


Seiko Instruments Inc. Is a Japanese company which head office is located in 8, Nakase 1-chome, Mihama-ku, Chiba-shi, Chiba 261-8507, Japan . It’s business lines are: Watches Business Watches, Watch Movements Electronic Components Business Quartz crystals, Micro batteries, etc. Precision Mechatronics Business Inkjet printer heads, Hard disk components, Thermal printers, Compact precision components, Machine tools, FA, Musical instrument accessories, Radiation detection and measurement systems, etc.

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