TPS54335ADDAR Step-Down Converter Description

The TPS54335A step-down converter is synchronous converter with input voltage ranging from 4.5 to 28 V. It has an inbuilt low-side switching FET, which eliminates the need for an external diode, resulting in a lower component count.

The integrated 128-m and 84-m MOSFETs, low IQ, and pulse skipping at mild loads optimize efficiency. The shutdown supply current is decreased to 2 A by using the enable pin. With a well-regulated voltage reference that is 1.5 percent over-temperature, this step-down (buck) converter delivers accurate control for a range of loads.

The TPS5433xA series of devices are protected in overload conditions by cycle-by-cycle current limiting on the high-side MOSFET, which is reinforced by a low-side sourcing current limit that prevents current runaway. To prevent excessive reverse current, a low-side sinking current limit switches off the low-side MOSFET. If the overcurrent condition lasts longer than the predetermined time, hiccup protection is activated. When the die temperature reaches the threshold, thermal shutdown disables the device and re-enables it after the built-in thermal hiccup time.

TPS54335ADDAR Step-Down Converter Features

Pulse Skipping for Light-Load Efficiency

0.8-V Voltage Reference with ±0.8% Accuracy

8-Pin SO PowerPAD and 10-Pin VSON Packages

Continuous Output Current: 3 A 

Internal 2-ms Soft-Start,

Low 2-μA Shutdown, Quiescent Current

Hiccup Mode Overcurrent Protection

Overvoltage Transition Protection

Thermal Shutdown (TSD) and

Adjustable Frequency: 50 kHz ~ 1.5 MHz 

Current Mode Control

Monotonic Startup into Pre-Biased Outputs

TPS54335ADDAR Step-Down Converter Applications

Power Bus Supply

Digital TVs

Set-Top Box

Battery Chargers

Smart Meters

CPE

DLP Projectors

Industrial and Car Audio Power

LCD Display