1 Features

• Synchronous 128-mΩ and 84-mΩ MOSFETs for

3-A Continuous Output Current

• TPS54335A: Internal 2-ms Soft-Start,

50-kHz to 1.5-MHz Adjustable Frequency

• TPS54336A: Adjustable Soft-Start,

Fixed 340-kHz Frequency

• Low 2-μA Shutdown, Quiescent Current

• 0.8-V Voltage Reference with ±0.8% Accuracy

• Current Mode Control

• Monotonic Startup into Pre-Biased Outputs

• Pulse Skipping for Light-Load Efficiency

• Hiccup Mode Overcurrent Protection

• Thermal Shutdown (TSD) and

Overvoltage Transition Protection

• 8-Pin SO PowerPAD™ and 10-Pin VSON

Package

• Create a Custom Design Using the TPS54335A

with the WEBENCH Power Designer

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

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

3 Description

The TPS5433xA family of devices are synchronous

converters with an input-voltage range of 4.5 V to 28

V. These devices include This device has an

integrated low-side switching FET that eliminates the

need for an external diode which reduces component

count.

Efficiency is maximized through the integrated 128-

mΩ and 84-mΩ MOSFETs, low IQ and pulse skipping

at light loads. Using the enable pin, the shutdown

supply current is reduced to 2 μA. This step-down

(buck) converter provides accurate regulation for a

variety of loads with a well-regulated voltage

reference that is 1.5% over temperature.

Cycle-by-cycle current limiting on the high-side

MOSFET protects the TPS5433xA family of devices

in overload situations and is enhanced by a low-side

sourcing current limit which prevents current

runaway. A low-side sinking current-limit turns off the

low-side MOSFET to prevent excessive reverse

current. Hiccup protection is triggered if the

overcurrent condition continues for longer than the

preset time. Thermal shutdown disables the device

when the die temperature exceeds the threshold and

enables the device again after the built-in thermal

hiccup time.