8181

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




Specifications

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. . . . . . . . . . . .. . . . .. . . . . . . . . . 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.



Description

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, 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.