Datasheet > UCC281-3

UCC281-3

更新时间： 2024-11-09 12:19:47

品牌	Logo	应用领域
德州仪器 - TI		稳压器
页数	文件大小	规格书
10页	101K
描述
Low Dropout 1 Ampere Linear Regulator Family

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中文翻译

获取价格

数据手册

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UCC281-3 数据手册

UCC281-3/-5/-ADJ

UCC381-3/-5/-ADJ

Low Dropout 1 Ampere Linear Regulator Family

DESCRIPTION

FEATURES

The UCC381-3/-5/-ADJ family of positive linear series pass regulators is

tailored for low drop out applications where low quiescent power is impor-

tant. Fabricated with a BiCMOS technology ideally suited for low input to

output differential applications, the UCC381 will pass 1A while requiring

only 0.5V of input voltage headroom. Dropout voltage decreases linearly

with output current, so that dropout at 200mA is less than 100mV. Quies-

cent current is always less than 650µA. To prevent reverse current conduc-

tion, on-chip circuitry limits the minimum forward voltage to typically 50mV.

Once the forward voltage limit is reached, the input-output differential volt-

age is maintained as the input voltage drops until undervoltage lockout dis-

ables the regulator.

• Precision Positive Linear Voltage

Regulation

• 0.5V Dropout at 1A

• Guaranteed Reverse Input/ Output

Voltage Isolation with Low Leakage

• Low Quiescent Current Irrespective of

Load

• Adjustable Output Voltage Version

• Fixed Versions for 3.3V and 5V

Outputs

UCC381-3 and UCC381-5 versions have on-chip resistor networks preset

to regulate either 3.3V or 5.0V, respectively. Furthermore, remote sensing

of the load voltage is possible by connecting the VOUTS pin directly at the

load. The output voltage is then regulated to 1.5% at room temperature and

better than 2.5% over temperature. The UCC381-ADJ version has a regu-

lated output voltage programmed by an external user-definable resistor ra-

tio.

• Logic Shutdown Capability

• Short Circuit Power Limit of

3% • V • Current Limit

• Remote Load Voltage for Accurate

Load Regulation

(continued)

BLOCK DIAGRAM

VIN

VOUT

PUMP

VOUTS

VOLTAGE

AMPLIFIER

CURRENT

LIMIT

–

1.3/2.1A

CURRENT

REFERENCE

GND

1.25V

SHUTDOWN FOR FIXED VERSIONS

CT*

0.65V

3% DUTY CYCLE

CURRENT LIMIT TIMER

*ADJ

VERSION

ONLY

OPEN

50k

REVERSE VOLTAGE

SENSE

UCC381-ADJ

UCC381-3

UCC381-5

UVLO

82k

150k

THERMAL

SHUTDOWN

50k

UDG-98112

SLUS214B -JANUARY 2001

12 3 4 5 6 7...10

中文翻译

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