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BQ2057C

ACTIVE

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

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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

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.

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Technical documentation

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Type Title Date
* Data sheet Advanced Linear Charge Mgmt IC for Single/Two-Cell Lithium-Ion & Lithium-Polymer datasheet (Rev. G) 23 Dec 2022

Design & development

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

GUI for evaluation module (EVM)

SLVC024 bq24715 EVM GUI Package

Supported products & hardware

Supported products & hardware

Products
Battery charger ICs
BQ2000 Switch-mode multi-chemistry battery charger with peak voltagedetection termination BQ2000T Switch-mode multi-chemistry battery charger with dT/dt termination BQ2002 NiCd/NiMH battery charge controller with negative dV, PVT and Top-Off Time setup1 BQ2002C NiCd/NiMH battery charge controller with negative dV, PVT BQ2002D NiCd/NiMH battery charge controller with dT/dt termination BQ2002E NiCd/NiMH battery charge controller with negative dV, PVT and tMTO setup1 BQ2002F NiCd/NiMH battery charge controller with negative dV, PVT and Top-Off Time setup2 BQ2002G NiCd/NiMH battery charge controller with negative dV, PVT and tMTO setup2 BQ2002T NiCd/NiMH battery charge controller with dT/dt termination and low-temperature fault BQ2031 Switch-mode Lead-Acid Battery Charger with User-Selectable Charge Algorithms BQ2057C Low Dropout linear 1-cell Li-ion battery charge controller with AutoCompTM, 4.2V BQ24010 1-cell, 1-A, linear Li-ion battery charger with AC present and temp sense in QFN-11 package BQ24012 1-cell, 1-A, linear Li-ion battery charger w/ FET, AC present & charge enable in QFN-12 BQ24013 1-cell, 1-A, linear Li-ion battery charger with charge enable & term enable in QFN-11 package BQ24200 500-mA, 4.2-V Li-ion charger for current-Limited App. w/temp sense in MSOP-8 BQ24201 500-mA, 4.1-V Li-ion charger for current-Limited App. w/temp sense in MSOP-8 BQ24202 500-mA, 4.2-V Li-ion charger for current-Limited App. w/charge status in MSOP-8 BQ24203 500-mA, 4.1-V Li-ion charger for current-Limited App. w/charge status in MSOP-8 BQ24205 500-mA, 4.1-V Li-ion charger for current-Limited App. in MSOP-8 BQ24715 SMBus 2-3 cell NVDC Buck battery charge controller with N-Channel MOSFET selectors
Software
Support software
TEMPSENSE-SW Temp Sense Designer Software
Support software

TEMPSENSE-SW — Temp Sense Designer Software

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

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