BQ2057C Series
Low Dropout linear 1-cell Li-ion battery charge controller with AutoCompTM, 4.2V
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
Low Dropout linear 1-cell Li-ion battery charge controller with AutoCompTM, 4.2V
| Part | Programmable Features | Current - Charging | Number of Cells | Mounting Type | Battery Chemistry | Supplier Device Package | Operating Temperature [Min] | Operating Temperature [Max] | Voltage - Supply (Max) [Max] | Battery Pack Voltage | Package / Case | Package / Case | Package / Case |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ2057CTS | Current | Constant - Programmable | 1 | Surface Mount | Lithium Ion/Polymer | 8-TSSOP | -20 °C | 70 °C | 15 V | 4.2 V | 8-TSSOP (0.173", 4.40mm Width) | ||
Texas Instruments BQ2057CDGKR | Current | Constant - Programmable | 1 | Surface Mount | Lithium Ion/Polymer | -20 °C | 70 °C | 15 V | 4.2 V | 8-MSOP, 8-TSSOP | 0.118 in | 3 mm | |
Texas Instruments BQ2057CTSTR | Current | Constant - Programmable | 1 | Surface Mount | Lithium Ion/Polymer | 8-TSSOP | -20 °C | 70 °C | 15 V | 4.2 V | 8-TSSOP (0.173", 4.40mm Width) | ||
Texas Instruments BQ2057CSNTR | Current | Constant - Programmable | 1 | Surface Mount | Lithium Ion/Polymer | 8-SOIC | -20 °C | 70 °C | 15 V | 4.2 V | 8-SOIC | 3.9 mm | |
Texas Instruments BQ2057CSN | Current | Constant - Programmable | 1 | Surface Mount | Lithium Ion/Polymer | 8-SOIC | -20 °C | 70 °C | 15 V | 4.2 V | 8-SOIC | 3.9 mm | |
Texas Instruments BQ2057CDGK | Current | Constant - Programmable | 1 | Surface Mount | Lithium Ion/Polymer | -20 °C | 70 °C | 15 V | 4.2 V | 8-MSOP, 8-TSSOP | 0.118 in | 3 mm |
Key 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 packsRequires small number of external components0.3-V dropout voltage for minimizing heat dissipationBetter than ±1% voltage regulation accuracy with preset voltagesAutoCompM dynamic compensation of battery pack’s internal impedance to reduce charge timeOptional cell-temperature monitoring before and during chargeIntegrated voltage and current regulation with programmable charge-current and high- or low-side current sensingIntegrated cell conditioning for reviving deeply discharged cells and minimizing heat dissipation during initial stage of chargeCharge status output for single or dual led or host processor interfaceAutomatic battery-recharge featureCharge termination by minimum currentAutomatic low-power sleep mode when VCCis removedEVMs available for quick evaluationPackaging: 8-pin SOIC, 8-pin TSSOP, 8-pin MSOPIdeal for single (4.1 V or 4.2 V) and dual-cell (8.2 V or 8.4 V) Li-ion or Li-pol packsRequires small number of external components0.3-V dropout voltage for minimizing heat dissipationBetter than ±1% voltage regulation accuracy with preset voltagesAutoCompM dynamic compensation of battery pack’s internal impedance to reduce charge timeOptional cell-temperature monitoring before and during chargeIntegrated voltage and current regulation with programmable charge-current and high- or low-side current sensingIntegrated cell conditioning for reviving deeply discharged cells and minimizing heat dissipation during initial stage of chargeCharge status output for single or dual led or host processor interfaceAutomatic battery-recharge featureCharge termination by minimum currentAutomatic low-power sleep mode when VCCis removedEVMs available for quick evaluationPackaging: 8-pin SOIC, 8-pin TSSOP, 8-pin MSOP
Description
AI
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.