Features: High Efficiency Provides Extended Battery Life
85 mV Typical Dropout Voltage at IO = 60 mA
45 A Typical Quiescent Current at VI = 6 V
Up to 150 mA Output Current
Internal Thermal Protection
Surface-Mount Package
ApplicationCordless and Cellular Telephones
Personal Data Assistants
Personal Communicators
Palmtop ComputersPinout
SpecificationsInput Voltage, VI . . . . . . . . . . . . . . 10 V
Output Current, IO . . . . . . . . . . . .150mA*
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.V
DescriptionDesigned specifically to meet the requirement for extended opera-tion of battery-powered equipment such as cordless and cellular telephones, the A8187SLT voltage regulator offers the reduced dropout voltage and quiescent current essential for maximum battery life.Applicable also to palmtop computers and personal data assistants, A8187SLT delivers a regulated, continuous 3.3 V output at up to 75 mA under normal operating conditions, or to 150 mA (transient) under worst-case conditions.
A PMOS pass element provides a typical dropout voltage of only 85 mV at 60 mA of load current. The low dropout voltage permits deeper battery discharge before output regulation is lost. Furthermore, quiescent current does not increase as the dropout voltage is ap-proached, an ideal feature in standby/resume power systems where data integrity is crucial. Regulator accuracy and excellent temperature characteristics are provided by a bandgapreference.
A8187SLT is supplied in a small-outline plastic transistor package SOT-89/TO-243AA) for surface-mount applications. The A8187SLT is ated for operation over a temperature range of -20°C to +85°C. A imilar device with an ENABLE input for control over sequential power p, standby, or power down is the A8186SLU.
8187 Data Sheet
