Regulator. SN105125 Datasheet

SN105125 Datasheet PDF


Part SN105125
Description 150-mA Low Dropout Regulator
Feature SN105125 150ĆmA LOW DROPOUT REGULATOR WITH POK features D Low Dropout Voltage Regulator, 1.2-V D 15.
Manufacture etcTI
Datasheet
Download SN105125 Datasheet


SN105125 150ĆmA LOW DROPOUT REGULATOR WITH POK features D L SN105125 Datasheet




SN105125
SN105125
150ĆmA LOW DROPOUT REGULATOR WITH POK
features
D Low Dropout Voltage Regulator, 1.2-V
D 150-mA Load Current Capability
D Power Okay (POK) Function
D Load Independent, Low Ground
Current,150-µA
D Current Limiting
D Thermal Shutdown
D Low Sleep State Current (Off Mode)
D Fast Transient Response
D Low Variation Due to Load and Line
Regulation
D Output Stable With Low ESR Capacitors
D TTL Logic Controlled Enable Input
SLVS418 − JANUARY 2002
DBV PACKAGE
(TOP VIEW)
VI 1 5 VO
GND 2
EN 3 4 POK
applications
D Processor Powerup Sequencing
D Palmtop Computers, Laptops, and
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.
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.
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.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 2002, Texas Instruments Incorporated
1



SN105125
SN105125
150ĆmA LOW DROPOUT REGULATOR WITH POK
SLVS418 − JANUARY 2002
functional block diagram
VI
EN
Voltage
Reference
Thermal
Sensor
Undervoltage
Lockout
Overcurrent
Detection and
Dropout Voltage
Detection
Enable/Disable
Control
Fault
Error
Amplifier
Gate Drive Control
and
Current Amplifier
Active
Shutdown
Fault
Voltage Supervisor
With
Delay Timer
Power Okay
Control
TERMINAL
NAME
NO.
EN 3
GND
2
POK
4
VI 1
VO 5
Terminal Functions
I/O
I Enable/shutdown input (active high)
I Ground
I Power okay indicator
I Input supply voltage
O Output voltage
DESCRIPTION
GND
VO
POK
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265






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