1 Features
• Input voltage range: 1.1V to 5.5V
• Adjustable start-up in-rush control
• 1% accuracy over line, load, and temperature
• VBIAS permits low VIN operation with good transient
response
• Adjustable output: 0.8V to 3.6V
• Ultra-low dropout:
– 115mV (typical) (legacy chip) at 3.0A
– 120mV (typical) (new chip) at 3.0A
• Stable with any or no output capacitor (legacy
chip)
• Stable with any output capacitor ≥2.2μF (new chip)
• Power-good (PG) output allows supply monitoring
or provides a sequencing signal for other supplies
• Packages:
– 5mm × 5mm × 1mm VQFN (RGW)
– 3.5mm × 3.5mm VQFN (RGR), and DDPAK-7
(legacy chip only)

2 Applications
• Network attached storage - enterprise
• Rack servers
• Network interface cards (NIC)
• Merchant network and server PSU

3 Description
The TPS74401 low-dropout (LDO) linear regulators
provide an easy-to-use robust power-management
option for a wide variety of applications. The userprogrammable
soft-start minimizes stress on the input
power source by reducing capacitive inrush current
on start-up. The soft-start is monotonic and designed
for powering many different types of processors
and application-specific integrated circuits (ASICs).
The enable input and power-good output allow
easy sequencing with external regulators. Complete
flexibility lets the user configure a plan that meets the
sequencing requirements of field-programmable gate
arrays (FPGAs), digital signal processors (DSPs), and
other applications with specific start-up requirements.
A precision reference and error amplifier deliver 1%
accuracy over load, line, temperature, and process.
The device is stable without an output capacitor
(legacy chip) or with any type of capacitor ≥ 2.2μF
(new chip). The device is fully specified from TJ = –
40°C to 125°C.