BQ2057C

활성

AutoCompTM, 4.2V를 지원하는 저손실 선형 1셀 리튬 이온 충전 컨트롤러

지금 주문

데이터 시트

document-pdfAcrobat Advanced Linear Charge Mgmt IC for Single/Two-Cell Lithium-Ion & Lithium-Polymer datasheet (Rev. G) (영어)

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대안 비교

다른 핀 출력을 지원하지만 비교 대상 장치와 동일한 기능

BQ25170

활성

800mA 선형 배터리 충전기 - 1셀 리튬 이온 및 LiFePO4용 This product is an 800-mA, single cell Li-Ion and LiFePO4 battery linear charger with programmable charge voltage

BQ2057C

활성

데이터 시트

지금 주문

제품 상세 정보

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 V_CC 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 V_CC 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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