TPS74201_15 Datasheet, PDF (1/28 Pages) Texas Instruments – 1.5A Ultra-LDO with Programmable Soft-Start

TPS742xx
TPS742xx
www.ti.com
TPS742xx
SBVS064L – DECEMBER 2005 – REVISED NOVEMBER 2010
1.5A Ultra-LDO with Programmable Soft-Start
Check for Samples: TPS742xx
FEATURES
1
•2 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)
• 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
• 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
• Hot-Swap and Inrush Controls
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 1. Turn-On Response
DESCRIPTION
The TPS742xx low-dropout (LDO) linear regulators
provide 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 special 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 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.
ADJUSTABLE VOLTAGE VERSION
V_IN
V_BIAS
C_IN
1mF
C_BIAS
1mF
IN
PG
BIAS
EN ^{TPS74201 OUT}
SS
GND
FB
C_SS
R₃
R₁
C_OUT
R₂
Optional
V_OUT
V_IN
V_BIAS
FIXED VOLTAGE VERSION
C_IN
1mF
C_BIAS
1mF
IN
PG
BIAS
EN ^{TPS742xx OUT}
SS
C_SS
GND
SNS
R₃
V_OUT
C_OUT
Optional
Figure 2. Typical Application Circuits
1
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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.
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