SN105125

150mA LOW DROPOUT REGULATOR WITH POK

SLVS418 − JANUARY 2002

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POST OFFICE BOX 655303

features

Current,150-

µA

Regulation

applications

Notebooks

description

The SN105125 is a low dropout voltage regulator with an output tolerance of

±2% over the operating range. The

device is optimized for low noise applications and has a low quiescent current (enable <0.8 V). The device has

a low dropout voltage at full load (150 mA). The power okay function monitors the output voltage and indicates

when an error occurs in the system (active low). In the event of an output fault such as overcurrent, thermal

shutdown, or dropout, the power okay output is pulled low (open drain).

The SN105125 has a fast transient response recovery capability in the event of load transition from heavy load

to light load. The device also minimizes overshoot during this condition. During power down, the output

capacitor and load are de-energized through the internal active shutdown clamp, which is turned on when the

device is disabled.

The SN105125 requires a small output capacitor for stability with low ESR. An input capacitor is not required

unless the bulk ac capacitor is placed away from the device or the power supply is a battery. In this situation,

a 1-

µF capacitor is recommended for the application. Low ESR ceramic capacitors may be used with the device

to reduce board space in power applications, a key concern in hand-held wireless devices.

Copyright

 2002, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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DBV PACKAGE

(TOP VIEW)

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GND

EN

POK

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.