Datasheet > UCC28

UCC28

更新时间： 2024-09-28 22:41:47

品牌	Logo	应用领域
德州仪器 - TI		稳压器
页数	文件大小	规格书
8页	214K
描述
Low Dropout 3 Ampere Linear Regulator Family

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UCC28 数据手册

UCC283-3/-5/-ADJ

UCC383-3/-5/-ADJ

Low Dropout 3 Ampere Linear Regulator Family

FEATURES

DESCRIPTION

• Precision Positive Series Pass The UCC283-3/-5/-ADJ family of positive linear series pass regulators are tailored

Voltage Regulation

• 0.45V Dropout at 3A

• 50mV Dropout at 10mA

for low drop out applications where low quiescent power is important. Fabricated

with a BiCMOS technology ideally suited for low input to output differential applica-

tions, the UCC283-5 will pass 3A while requiring only 0.45V of typical input voltage

headroom (guaranteed 0.6V dropout). These regulators include reverse voltage

sensing that prevents current in the reverse direction. Quiescent current is always

less than 650µA. These devices have been internally compensated in such a man-

ner that the need for a minimum output capacitor has been eliminated.

• Quiescent Current Under

650µA Irrespective of Load

• Adjustable (5 Lead) Output

Voltage Version

UCC283-3 and UCC283-5 versions are in 3 lead packages and have preset outputs

at 3.3V and 5.0V respectively. The output voltage is regulated to 1.5% at room tem-

perature. The UCC283-ADJ version, in a 5 lead package, regulates the output volt-

age programmed by an external resistor ratio.

• Fixed (3 Lead) Versions for

3.3V and 5V Outputs

• Logic Shutdown Capability

• Short Circuit Power Limit of

Short circuit current is internally limited. The device responds to a sustained over-

current condition by turning off after a T delay. The device then stays off for a pe-

riod, T , that is 32 times the T delay. The device then begins pulsing on and off

OFF

3% •V • I

SHORT

at the T /(T +T

) duty cycle of 3%. This drastically reduces the power dissipa-

ON OFF

• Low V

Leakage

to V Reverse

tion during short circuit and means heat sinks need only accommodate normal op-

eration. On the 3 leaded versions of the device T is fixed at 750µs, on the

OUT

adjustable 5 leaded versions an external capacitor sets the on time — the off time

• Thermal Shutdown

is always 32 times T . The external timing control pin, CT, on the five leaded ver-

sions also serves as a shutdown input when pulled low.

Internal power dissipation is further controlled with thermal overload protection cir-

cuitry. Thermal shutdown occurs if the junction temperature exceeds 165°C. The

chip will remain off until the temperature has dropped 20°C.

The UCC283 series is specified for operation over the industrial range of −40°C to

+85°C, and the UCC383 series is specified from 0°C to +70°C. These devices are

available in 3 and 5 pin TO-220 and TO-263 power packages.

BLOCK DIAGRAM

UDG-98133

SLUS215 - OCTOBER 1998

12 3 4 5 6 7 8

中文翻译

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