TI TPS54335-1ADRCT

The TPS5433xA series devices are synchronous converters with an input voltage range of 4.5V to 28V. These devices integrate a low-side switch FET, eliminating the need for an external diode and reducing component count.

Efficiency is significantly improved through integrated 128mΩ and 84mΩ MOSFETs, low IQ, and pulse-skip mode under light load. The shutdown supply current can be reduced to 2μA via the enable pin. The reference voltage of this buck converter maintains 1.5% accuracy over the full temperature range, providing precise regulation for various loads.

Cycle-by-cycle current limiting on the high-side FET protects the TPS5433xA series devices under overload conditions, while low-side power current limiting prevents current runaway, enhancing functionality. Low-side sink current limiting turns off the low-side MOSFET to prevent excessive reverse current. A hiccup protection feature is triggered when an overcurrent condition persists beyond a preset time. Thermal shutdown disables the device when the die temperature exceeds the threshold and re-enables it after a built-in thermal hiccup interval.

• Synchronous 128mΩ and 84mΩ MOSFETs for 3A continuous output current
• TPS54335A: Internal 2ms soft-start, adjustable frequency from 50kHz to 1.5MHz
• TPS54336A: Adjustable soft-start, 340kHz fixed frequency
• Shutdown quiescent current as low as 2μA
• 0.8V reference voltage with ±0.8% accuracy
• Current mode control
• Monotonic startup for pre-biased output
• Pulse skip mode for improved light-load efficiency
• Hiccup mode overcurrent protection
• Thermal shutdown (TSD) and overvoltage transient protection
• 8-pin Small Outline (SO) PowerPAD and 10-pin Very Thin Small Outline No-Lead (VSON) packages

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