1 Features

1• Two 128mΩ/84mΩ MOSFETs for 3A Continuous

Output Current

• Power Good

• Low 2 μA Shutdown Quiescent Current

• 0.8 V Internal Voltage Reference with ±1.5%

Accuracy Over Temperature

• Fixed-Frequency Current Mode Control

• Pulse Skipping Boosts Efficiency at Light Loads

• Overcurrent Protection for Both MOSFETs with

Hiccup Mode for Severe Fault Conditions

• Thermal and Overvoltage Transient Protection

• Available in Easy-to-Use 8-Pin SOIC

PowerPAD™ and 10-Pin SON

• Monotonic Start-Up into Pre-biased Outputs

2 Applications

• Consumer Applications such as a Digital TV

(DTV), Set Top Box (STB, DVD/Blu-ray Player),

LCD Display, CPE (Cable Modem, WiFi Router),

DLP Projectors, Smart Meters

• Battery Chargers

• Industrial and Car Audio Power Supplies

• 5V,12 and 24V Distributed Power Bus Supply

3 Description

The TPS54334 is a 28-V, 3-A, low quiescent supply

current (IQ), synchronous monolithic buck converter

with integrated MOSFETs.

The TPS54334 enables small designs by integrating

the MOSFETs and implementing current mode

control to reduce external component count.

Efficiency is maximized through the integrated

128mΩ/84mΩ MOSFETs, low quiescent supply

current and pulse skipping at light loads. Using the

enable pin, shutdown supply current is reduced to

μA by entering a shutdown mode.

The TPS54334 provides accurate regulation for a

variety of loads with an accurate 1.5% voltage

reference over temperature.

Cycle by cycle current limiting on the high-side fet

protects the TPS54334 in overload situations and is

enhanced by a low-side sourcing current limit which

prevents current runaway. There is also a low-side

sinking current limit which turns off the low-side

MOSFET to prevent excessive reverse current.

Hiccup protection will be triggered if the overcurrent

condition has persisted for longer than the preset

time. Thermal hiccup protection disables the part

when die temperature exceeds thermal shutdown

temperature and enables the part again after the

built-in thermal hiccup time.