8188

Features:

High Efficiency Provides Extended Battery Life
90 mV Typical Dropout Voltage at I_O  = 60 mA
55 A Typical Quiescent Current Less Than 1 A "Sleep" Current
250 mA Peak Output Current
Improved PSRR and Transient Performance
Internal Thermal Protection



Application

Cordless and Cellular Telephones
FERENCE OPersonal Data Assistants
Personal Communicators
Palmtop Computers


Pinout




Specifications

Input Voltage, V_I . . . . . . . . . . . . . .  10 V
Peak Output Current,   
     I_OM . . . . . . . . . . . . . . . . . .   250 mA*
Enable Input Voltage, V_E . . . . . . . . .   V_I
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

Designed specifically to meet the requirement for extended opera-tion of battery-powered equipment such as cordless and cellular tele-phones, the A8188S- voltage regulators offer the reduced dropout voltage and quiescent current essential for maximum battery life.Applicable also to palmtop computers and personal data assistants, A8188S deliver a regulated output at up to 250 mA (transient),which is limited only by package power dissipation.  Regulated output voltages between 2.5 V and 3.3 V are trimmed at wafer probe.

A PMOS pass element provides a typical dropout voltage of only 90 mV at 60 mA of load current.  The low dropout voltage permits deeper battery discharge before output regulation is lost.  Quiescent current does not increase significantly 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 bandgap reference.  The A8188SL-xxincludes ENABLE inputs to give the designer complete control over power up, standby, or power down.

A8188S are supplied, without the ENABLE function, in a standard 3-lead SOT-89/TO-243AA small-outline plastic transistor package (suffix 'LT').  Dual regulators (A8188SL-xx) are provided in an 8-lead SOIC package.  All devices are rated for operation over a temperature range of -20°C to +85°C.