Home Battery management ICs Battery charger ICs
Home
Battery management ICs
Battery charger ICs

BQ2057C

ACTIVE

Low Dropout linear 1-cell Li-ion battery charge controller with AutoCompTM, 4.2V

Order now
Data sheet

A newer version of this product is available

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
BQ25170 ACTIVE 800-mA linear battery charger for 1-cell Li-ion and LiFePO4 This product is an 800-mA, single cell Li-Ion and LiFePO4 battery linear charger with programmable charge voltage

BQ2057C

ACTIVE
Data sheet Order now

Product details

Number of series cells 1 Charge current (max) (A) 2 Vin (max) (V) 15 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 4.2 Battery charge voltage (max) (V) 4.2 Absolute max Vin (max) (V) 18 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile) Vin (min) (V) 4.5 Rating Catalog Operating temperature range (°C) -20 to 70
Number of series cells 1 Charge current (max) (A) 2 Vin (max) (V) 15 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 4.2 Battery charge voltage (max) (V) 4.2 Absolute max Vin (max) (V) 18 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile) Vin (min) (V) 4.5 Rating Catalog Operating temperature range (°C) -20 to 70
SOIC (D) 8 29.4 mm² 4.9 x 6 TSSOP (PW) 8 19.2 mm² 3 x 6.4 VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • 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
  • AutoCompM 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
  • 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
  • AutoCompM 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

The 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.

The 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.
filter Find other Battery charger ICs
Download

Similar products you might be interested in

open-in-new Compare alternates
Similar functionality to the compared device
BQ24040 ACTIVE Standalone 1-cell 1-A linear battery charger with 4.2-V VBAT and Temperature Sensing This product is a 1A, standalone, single-cell Li-Ion battery charger in a 2x2mm package.
BQ24401 ACTIVE Switch-mode NiCd/NiMH battery charger with dT/dt termination This product is a standalone fast charge IC for nickle cadmium (NiCd) and nickel metal-hydride (NiMH)

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Data sheet Advanced Linear Charge Mgmt IC for Single/Two-Cell Lithium-Ion & Lithium-Polymer datasheet (Rev. G) 23 Dec 2022

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​