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Product details

Parameters

Number of series cells 2 Charge current (Max) (A) 2 Operating Vin (Max) (V) 15 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 8.4 Battery charge voltage (Max) (V) 8.4 Absolute Vin (safety rating) (Max) ((V)) 18 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile) Operating Vin (Min) (V) 4.5 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

SOIC (D) 8 19 mm² 3.91 x 4.9 TSSOP (PW) 8 19 mm² 3 x 6.4 open-in-new Find other Battery charger ICs

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 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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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.

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.

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Technical documentation

= Featured
No results found. Please clear your search and try again. View all 5
Type Title Date
* Datasheet Advanced Linear Charge Mgmt IC for Single/Two-Cell Lithium-Ion & Lithium-Polymer datasheet (Rev. F) Jul. 25, 2002
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical articles Should I use a linear charger or a switching charger? Oct. 30, 2015
Technical articles The importance of battery management for eCall systems Jul. 02, 2015
Technical articles Summertime and the livin' is easy Jun. 20, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Software development

SUPPORT SOFTWARE Download
Temp Sense Designer Software
TEMPSENSE-SW The TempSense Designer software allows the user to easily design temperature sensing circuits for many of the Texas Instruments battery charger devices. A full listing of the supported devices is included under the "Support" menu in the program. The user can use the thermisters included in the (...)
Features

The program gives the user:

  • Worse-case limits of the resistance
  • Trip voltages
  • Temperatures of the design

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
TSSOP (PW) 8 View options

Ordering & quality

Support & training

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