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BQ2057TTSTR Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2057TTSTR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 30 page bq2057, bq2057C bq2057T, bq2057W SLUS025F − MAY 2001 − REVISED JULY 2002 ADVANCED LINEAR CHARGE MANAGEMENT IC FOR SINGLE AND TWOCELL LITHIUMION AND LITHIUMPOLYMER 1 www.ti.com FEATURES D 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 D Requires Small Number of External Components D 0.3 V Dropout Voltage for Minimizing Heat Dissipation D Better Than ±1% Voltage Regulation Accuracy With Preset Voltages D AutoCompt Dynamic Compensation of Battery Pack’s Internal Impedance to Reduce Charge Time D Optional Cell-Temperature Monitoring Before and During Charge D Integrated Voltage and Current Regulation With Programmable Charge-Current and High- or Low-Side Current Sensing D Integrated Cell Conditioning for Reviving Deeply Discharged Cells and Minimizing Heat Dissipation During Initial Stage Of Charge D Charge Status Output for Single or Dual Led or Host Processor Interface D Automatic Battery-Recharge Feature D Charge Termination by Minimum Current D Automatic Low-Power Sleep Mode When VCC Is Removed D EVMs Available for Quick Evaluation D Packaging: 8-Pin SOIC, 8-Pin TSSOP, 8-Pin MSOP DESCRIPTION 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. COMP CC VSS STAT 8 7 6 5 1 2 3 4 SNS BAT VCC TS bq2057xSN or bq2057xTS SOIC (SN) or TSSOP (TS) PACKAGE (TOP VIEW) BAT SNS COMP CC 8 7 6 5 1 2 3 4 VCC TS STAT VSS bq2057xDGK MSOP (DGK) PACKAGE (TOP VIEW) PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. AutoComp is a trademark of Texas Instruments. Copyright 2002, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. |
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