Datasheet
TPS731xx
GNDEN NR
IN OUT
V
IN
V
OUT
Optional Optional
Optional
ON
OFF
DBVPACKAGE
SOT23
(TOPVIEW)
OUT
NR/FB
IN
GND
EN
1
2
3
5
4
TypicalApplicationCircuitforFixed-VoltageVersions
TPS731xx
www.ti.com
.......................................................................................................................................... SBVS034M –SEPTEMBER 2003–REVISED AUGUST 2009
Cap-Free, NMOS, 150mA Low Dropout Regulator
with Reverse Current Protection
1
FEATURES
DESCRIPTION
2
• Stable with No Output Capacitor or Any Value
The TPS731xx family of low-dropout (LDO) linear
or Type of Capacitor
voltage regulators uses a new topology: an NMOS
pass element in a voltage-follower configuration. This
• Input Voltage Range of 1.7V to 5.5V
topology is stable using output capacitors with low
• Ultralow Dropout Voltage: 30mV Typ
ESR, and even allows operation without a capacitor.
• Excellent Load Transient Response—with or
It also provides high reverse blockage (low reverse
without Optional Output Capacitor
current) and ground pin current that is nearly constant
over all values of output current.
• New NMOS Topology Provides Low Reverse
Leakage Current
The TPS731xx uses an advanced BiCMOS process
to yield high precision while delivering very low
• Low Noise: 30μV
RMS
Typ (10kHz to 100kHz)
dropout voltages and low ground pin current. Current
• 0.5% Initial Accuracy
consumption, when not enabled, is under 1μA and
• 1% Overall Accuracy over Line, Load, and
ideal for portable applications. The extremely low
Temperature
output noise (30μV
RMS
with 0.1μF C
NR
) is ideal for
powering VCOs. These devices are protected by
• Less Than 1μA Max I
Q
in Shutdown Mode
thermal shutdown and foldback current limit.
• Thermal Shutdown and Specified Min/Max
Current Limit Protection
• Available in Multiple Output Voltage Versions
– Fixed Outputs of 1.20V to 5.0V
– Adjustable Outputs from 1.20V to 5.5V
– Custom Outputs Available
APPLICATIONS
• Portable/Battery-Powered Equipment
• Post-Regulation for Switching Supplies
• Noise-Sensitive Circuitry such as VCOs
• Point of Load Regulation for DSPs, FPGAs,
ASICs, and Microprocessors
space
1
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.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2003–2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.