TPS749XX_08 Datasheet, PDF (1/26 Pages) Texas Instruments – 3.0A Low Dropout Linear Regulator with Programmable Soft-Start

TPS749xx
www.ti.com
SBVS082B – JUNE 2007 – REVISED OCTOBER 2007
3.0A Low Dropout Linear Regulator with Programmable Soft-Start
FEATURES
1
•2 Ultra-Low V_IN and V_OUT Range: 0.8V to 5.5V
• V_BIAS Range: 2.7V to 5.5V
• Low Dropout: 120mV (typ) at 3.0A, V_BIAS = 5V
• Power-Good (PG) Output Allows Supply
Monitoring or Provides a Sequencing Signal
for Other Supplies
• 2% Accuracy Over Line/Load/Temperature
• Programmable Soft-Start Provides Linear
Voltage Startup
• V_BIAS Permits Low V_IN Operation with Good
Transient Response
• Stable with Any Output Capacitor ≥ 2.2μF
• Available in 5mm × 5mm × 1mm QFN and
DDPAK-7 Packages
• Open-Drain Power-Good
• 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
IN
PG
C_IN
BIAS
R₃
EN ^{TPS74901 OUT}
V_BIAS
C_BIAS
SS
GND
R₁
FB
C_SS
R₂
V_OUT
C_OUT
Figure 1. Typical Application Circuit (Adjustable)
DESCRIPTION
The TPS749xx 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 meets the
sequencing requirements of FPGAs, DSPs, and other
applications with special start-up requirements.
A precision reference and error amplifier deliver 2%
accuracy over load, line, temperature, and process.
The device is stable with any type of capacitor
≥ 2.2μF, and the device is fully specified from –40°C
to +125°C. The TPS749xx is offered in a small (5mm
× 5mm) QFN package, yielding a highly compact total
solution size. It is also available in a DDPAK-7.
blank
blank
blank
blank
blank
blank
1V/div
C_SS = 0mF
C_SS = 0.001mF
C_SS = 0.0047mF
V_OUT
1.2V
V_EN
1V/div _0V
Time (1ms/div)
Figure 2. Turn-On Response
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.
All trademarks are the property of their respective owners.
2
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 © 2007, Texas Instruments Incorporated