HIGH EFFICIENCY. 8181 Datasheet
LOW-DROPOUT/ 5 V REGULATOR . HIGH EFFICIENCY
|Total Page||8 Pages|
5 V REGULATOR
LOW-DROPOUT, 5 V REGULATOR
— HIGH EFFICIENCY
Especially suited for hand-held, portable, battery-operated equip-
U YGROUND 4
D LGROUND 5
O NENABLE 6 VR 11 NC
R OIN 7
TINUEERENABSOLUTE MAXIMUM RATINGS
Fat TA = +25°C
NInput Voltage, VI ................................... 10 V
EOutput Current, IO
O(40% duty cycle) ............................ 1 A*
R(75% duty cycle) ..................... 500 mA*
C(continuous) ............................ 370 mA*
S ROperating Temperature Range,
TA ................................. -20°C to +85°C
I OJunction Temperature, TJ .............. +150°C†
Storage Temperature Range,
D FTS ............................... -40°C to +150°C
* Output current rating is limited by input voltage,
—duty cycle, and ambient temperature. Under any
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
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
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 .
5 V REGULATOR
FUNCTIONAL BLOCK DIAGRAM
MAXIMUM ALLOWABLE OUTPUT CURRENT with device mounted on 2.24" x 2.24"
(56.9 mm x 56.9 mm) solder-coated copper-clad board in still air.
Maximum Allowable Output Current in Milliamperes with VI = 10 V, TJ = 150°C*
dc (Duty Cycle)
* IO = (TJ - TA)/([VI - VO] RθJA • dc) = (150 - TA)/(5 • 67 • dc)
Output current rating can be increased (to 1 A maximum) by heat sinking or reducing the input voltage. With an infinite heat sink, R-JA = R-JT =
6°C/W. Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated
but should be avoided.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1992, 1995 Allegro MicroSystems, Inc.
|Features||Datasheet pdf 8181 LOW-DROPOUT, 5 V REGULATOR 8181 L OW-DROPOUT, 5 V REGULATOR — HIGH EFFI CIENCY Especially suited for hand-held, portable, battery-operated equipment s uch as cellular telephones, the A8181SL B low dropout voltage regulator provide s high efficiency for maximum battery l ife in a minimum package size. Equally applicable to camcorders and portable c omputers, the device provides a fixed 5 V regulated continuous output at almos t 200 mA of load current under worst-ca se conditions. Under normal operating c onditions, output currents over 500 mA are permitted. A MOSFET pass element de livers high output current with an inpu t-output differential of less than 300 mV. For high efficiency, the low dropou t voltage allows a longer battery disch arge before output voltage regulation i s lost. A low quiescent current, even d uring high load conditions, makes the d evice ideal for standby power systems. High regulator accuracy and excellent t emperature characteristics are provided by a bandgap reference. A.|
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