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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 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 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.
8181 Maximum Ratings
Input Voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . 10 V Output Current, IO (40% duty cycle) . . . . . . . . . . . .. . . . . . . . . . . 1 A (75% duty cycle) . . . . . . . . . . . . . . . . . . .500 mA* (continuous) . . . . . . . . . . . . . .. . . . . . . . .370 mA* Operating Temperature Range. T A. . . . . . . . . . . .. . . . .. . . . . . . . . . 20to +85 Junction Temperature, TJ . . . . . . . . . .. . . . . ..+150 Storage Temperature Range, TS . . . . . . . . . . .. . . . . . . . . . ... . . 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.
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