8181 查看數據表（PDF） - Allegro MicroSystems

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8181

LOW-DROPOUT, 5 V REGULATOR — HIGH EFFICIENCY

Allegro MicroSystems 

8181

LOW-DROPOUT,

5 V REGULATOR

8181

LOW-DROPOUT, 5 V REGULATOR

— HIGH EFFICIENCY

Especially suited for hand-held, portable, battery-operated equip-

T NC 1

16 OUT

NC 2

C NC 3

U Y GROUND 4

15 OUT

14 NC

13 GROUND

D L GROUND 5

12 GROUND

O N ENABLE 6

VR

11 NC

R O IN 7

10 NC

P IN 8

9 NC

D CE Dwg.PS-018

TINUEEREN ABSOLUTE MAXIMUM RATINGS

F at TA = +25°C

N Input Voltage, VI ................................... 10 V

E Output Current, IO

O (40% duty cycle) ............................ 1 A*

R (75% duty cycle) ..................... 500 mA*

C (continuous) ............................ 370 mA*

Operating Temperature Range,

S R TA ................................. -20°C to +85°C

I Junction Temperature, TJ .............. +150°C†

O Storage Temperature Range,

D F TS ............................... -40°C to +150°C

ment such as cellular telephones, the A8181SLB low dropout voltage

regulator provides high efficiency for maximum battery life in a mini-

mum package size. Equally applicable to camcorders and portable

computers, the device provides a fixed 5 V regulated continuous output

at almost 200 mA of load current under worst-case conditions. Under

normal operating conditions, output currents over 500 mA are

permitted.

A MOSFET pass element delivers high output current with an

input-output differential of less than 300 mV. For high efficiency, the

low dropout voltage allows a longer battery discharge before output

voltage regulation is lost. A low quiescent current, even during high

load conditions, makes the device ideal for standby power systems.

High regulator accuracy and excellent temperature characteristics are

provided by a bandgap reference. An enable input gives the designer

complete control over sequential power-up or emergency shutdown.

This device is supplied in a 16-lead wide-body, small-outline

plastic power package (SOIC) for surface-mount applications. The

copper batwing provides for maximum package power dissipation in

the smallest possible construction. The A8181SLB is rated for opera-

tion over a temperature range of -20°C to +85°C.

FEATURES AND BENEFITS

s High Efficiency Provides Extended Battery Life

s Less Than 300 mV Dropout Voltage

s Low Quiescent Current

s >200 mA Output Current

s LSTTL-Compatible ON/OFF Control

For Sequential Power-up or Emergency Shutdown

s Internal Thermal Protection

s SOIC Surface-Mount Package

— * Output current rating is limited by input voltage,

duty cycle, and ambient temperature. Under any

set of conditions, do not exceed a junction

temperature of +150°C. See next page.

† Fault conditions that produce excessive

junction temperature will activate device thermal

shutdown circuitry. These conditions can be

tolerated but should be avoided.

Always order by complete part number: A8181SLB .

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