Description:

The TPS5433xA family of devices are synchronous converters with an input voltage range between 4.5V and 28V. The family integrates low-side switching field-effect transistors (FETs), eliminating the need for an external diode and thereby reducing component count. With integrated 128mΩ and 84mΩ MOSFETs, low IQ, and pulse-skipping mode at light loads, efficiency is greatly improved. The shutdown supply current can be reduced to 2µA via the enable pin. The buck converter's reference voltage maintains 1.5% accuracy over the full temperature range, providing accurate regulation for a variety of loads. Cycle-by-cycle current limiting of the high-side FET protects the TPS5433xA family under overload conditions, and low-side supply current limiting prevents current runaway for enhanced functionality. Low-side sink current limiting turns off the low-side MOSFET to prevent excessive reverse current. When an overcurrent condition persists longer than a preset time, hiccup protection is triggered. Thermal shutdown disables the device when the die temperature exceeds the threshold and re-enables the device after a built-in thermal hiccup time.

Features:

Synchronous 128mΩ and 84mΩ metal-oxide-semiconductor field-effect transistors (MOSFETs) for 3A continuous output current

TPS54335A: internal 2ms soft start, 50kHz to 1.5MHz adjustable frequency

TPS54336A: adjustable soft start, 340kHz fixed frequency

Quiescent current as low as 2µA when shut down

0.8V reference voltage with ±0.8% accuracy

Current-mode control

Monotonic startup for pre-biased outputs

Pulse-skipping mode to improve efficiency at light loads

Hiccup-mode overcurrent protection

Thermal shutdown (TSD) and overvoltage transition protection

8-pin small outline (SO) PowerPAD™ and 10-pin very-thin small outline no-lead (VSON) packages

Applications:

Consumer applications such as digital TVs (DTV), set-top boxes (STB, digital video disc (DVD)/Blu-ray players), LCD monitors, customer premises equipment (CPE) (cable modems, WiFi routers), digital light processing (DLP) projectors, smart meters

Battery chargers

Industrial and automotive audio power supplies

Powered from 5V, 12V, and 24V distributed power buses