8181
LOW-DROPOUT,
5 V REGULATOR
DISCONTINUED PRODUCT
— FOR REFERENCE ONL
Y
8181
LOW-DROPOUT, 5 V REGULATOR
— HIGH EFFICIENCY
Especially suited for hand-held, portable, battery-operated equip-
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
n High Efficiency Provides Extended Battery Life
n Less Than 300 mV Dropout Voltage
n Low Quiescent Current
n >200 mA Output Current
n LSTTL-Compatible ON/OFF Control
For Sequential Power-up or Emergency Shutdown
n Internal Thermal Protection
n SOIC Surface-Mount Package
Always order by complete part number: A8181SLB .
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25°C
Input Voltage, V
I
................................... 10 V
Output Current, I
O
(40% duty cycle) ............................ 1 A*
(75% duty cycle) ..................... 500 mA*
(continuous) ............................ 370 mA*
Operating Temperature Range,
T
A
................................. -20°C to +85°C
Junction Temperature, T
J
.............. +150°C†
Storage Temperature Range,
T
S
............................... -40°C to +150°C
* 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.
Data Sheet
27468*
1
2
3
4
512
13
14
15
16
GROUND
Dwg. PS-018
6
710
11
89
GROUND GROUND
GROUND
NC
NC
NC
OUT
IN
IN
ENABLE
NC
NC
NC NC
OUT
VR
5 V