TPS74401 Datasheet, PDF (1/22 Pages) Texas Instruments – 3.0A Ultra-Low Dropout Linear Regulator

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TPS74401
TPS74401
TPS74401
SBVS066D – DECEMBER 2005 – REVISED AUGUST 2006
3.0A Ultra-Low Dropout Linear Regulator
FEATURES
• Soft-Start (SS) Pin Provides a Linear Startup
with Ramp Time Set by External Capacitor
• 1% Accuracy Over Line, Load, and
Temperature
• Supports Input Voltages as Low as 0.9V with
External Bias Supply
• Adjustable Output (0.8V to 3.6V)
• Ultra-Low Dropout: 115mV at 3.0A (typ)
• Stable with Any or No Output Capacitor
• Excellent Transient Response
• Available in 5mm × 5mm × 1mm QFN and
DDPAK-7 Packages
• Open-Drain Power-Good (QFN only)
• Active High Enable
APPLICATIONS
• FPGA Applications
• DSP Core and I/O Voltages
• Post-Regulation Applications
• Applications with Special Start-Up Time or
Sequencing Requirements
• Hot-Swap and Inrush Controls
V_IN
V_BIAS
C_IN
1mF
C_BIAS
1mF
IN
PG
EN
BIAS ^{TPS74401 OUT}
SS
GND
FB
C_SS
R₃
R₁
C_OUT
R₂
Optional
V_PG
V_OUT
Figure 1. Typical Application Circuit
DESCRIPTION
The TPS74401 low-dropout (LDO) linear regulator
provides an easy-to-use robust power management
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 specific start-up requirements.
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 device is fully specified from
–40°C to +125°C. The TPS74401 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.
500mV/div
C_SS = 0mF
C_SS = 0.001mF
C_SS = 0.0047mF
V_OUT
1.1V
V_EN
1V/div _0V
Time (1ms/div)
Figure 2. Turn-On Response
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.
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 © 2005–2006, Texas Instruments Incorporated