TPS742xx
www.ti.com
SBVS064L –DECEMBER 2005–REVISED NOVEMBER 2010
1.5A Ultra-LDO with Programmable Soft-Start
Check for Samples: TPS742xx
1
FEATURES
DESCRIPTION
2
•
•
•
Soft-Start (SS) Pin Provides a Linear Startup
with Ramp Time Set by External Capacitor
The TPS742xx low-dropout (LDO) linear regulators
provide an easy-to-use robust power management
1% Accuracy Over Line, Load, and
Temperature
solution for
a
wide variety of applications.
User-programmable soft-start minimizes stress on the
input power source by reducing capacitive inrush
current on start-up. The soft-start is monotonic and
well suited for powering many different types of
processors and ASICs. The enable input and
power-good output allow easy sequencing with
external regulators. This complete flexibility permits
the user to configure a solution that will meet the
sequencing requirements of FPGAs, DSPs, and other
applications with special start-up requirements.
Supports Input Voltages as Low as 0.9V with
External Bias Supply
•
•
•
•
•
•
Adjustable Output (0.8V to 3.6V)
Fixed Output (0.9V to 3.6V)
Ultra-Low Dropout: 55mV at 1.5A (typ)
Stable with Any or No Output Capacitor
Excellent Transient Response
Available in 5mm × 5mm × 1mm QFN and
DDPAK-7 Packages
A precision reference and error amplifier deliver 1%
accuracy over load, line, temperature, and process.
Each LDO is stable with low-cost ceramic output
capacitors and the family is fully specified from –40°C
to +125°C. The TPS742xx is offered in a small (5mm
× 5mm) QFN package, yielding a highly compact total
solution size. For applications that require additional
power dissipation, the DDPAK (KTW) package is also
available.
•
•
Open-Drain Power-Good (5 × 5 QFN)
Active High Enable
APPLICATIONS
•
•
•
•
FPGA Applications
DSP Core and I/O Voltages
Post-Regulation Applications
Applications with Special Start-Up Time or
Sequencing Requirements
ADJUSTABLE VOLTAGE VERSION
VIN
IN
PG
CIN
1mF
•
Hot-Swap and Inrush Controls
R3
R1
BIAS
EN
SS
VOUT
OUT
TPS74201
VBIAS
COUT
CBIAS
1mF
FB
GND
CSS
R2
CSS = 0mF
VOUT
Optional
CSS = 0.001mF
CSS = 0.0047mF
1V/div
FIXED VOLTAGE VERSION
VIN
IN
PG
CIN
1mF
R3
BIAS
EN
VOUT
OUT
1.2V
TPS742xx
VEN
VBIAS
1V/div
SS
0V
COUT
CBIAS
1mF
SNS
GND
CSS
Time (1ms/div)
Optional
Figure 1. Turn-On Response
Figure 2. Typical Application Circuits
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.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2010, Texas Instruments Incorporated