Features: High Efficiency Provides Extended Battery Life
Less Than 300 mV Dropout Voltage
Low Quiescent Current >200 mA Output Current
LSTTL-Compatible ON/OFF Control
For Sequential Power-up or Emergency Shutdown
Internal Thermal Protection
SOIC Surface-Mount Package
Pinout
SpecificationsInput 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. . . . . . . . . . . .. . . . .. . . . . . . . . . 20to +85
Junction Temperature, T
J . . . . . . . . . .. . . . . ..+150
Storage Temperature Range,
T
S . . . . . . . . . . .. . . . . . . . . . ... . . 40 to +150
* Output current rating is limited by inputDISCONT voltage, duty cycle, and ambient tempera-ture. Under any set of conditions, do not exceed a junction temperature of +150°C.- FOR See following pages.
+ Fault conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These condi- tions can be tolerated but should be avoided.DescriptionEspecially 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, A8181SLB provides a fixed 5 V regulated continuous outpu 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 A8181SLB ideal for standby power systems. High regulator accuracy and excellent temperature characteristics of A8181SLB are provided by a bandgap reference. An enable input gives the designer complete control over sequential power-up or emergency shutdown.
A8181SLB 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.