Production£º

¡¾Part No.¡¿     BQ2057CDGK
¡¾Category¡¿   Two-Cell Lithium-Ion & Lithium-Polymer
¡¾Packing¡¿    MSOP 8
¡¾MFQ¡¿           TI
¡¾Datasheet¡¿BQ2057CDGK Datasheet

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.

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 ¡À1% 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

Contact person:

Frances New

Phone:+86-755-81832961

Fax:+86-755-83299282

Email:sumzi@sumzi.com

MSN:sumzi-frances@msn.com

http://www.sumzi.com