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The TPS54320 is a full-featured 17V, 3A synchronous buck converter that is ideal for small designs due to its high efficiency and integrated high-side and low-side MOSFETs. The device reduces component count through current-mode control and further saves space by choosing a high switching frequency to reduce inductor package size.

The output voltage start-up ramp is controlled by the SS/TR pin, allowing independent supply operation, or operation in tracking state. In addition, proper configuration of the enable and open-drain power good pins enables power sequencing.

Cycle-by-cycle current limit on the high-side FET protects the device during overload conditions and is enhanced by low-side source current limit to prevent current runaway. Hiccup mode protection is triggered when the overcurrent duration exceeds the preset time. The thermal shutdown feature disables the part when the die temperature exceeds the thermal shutdown temperature. The TPS54320 is available in a 14-pin 3.5mm × 3.5mm VQFN thermally enhanced package.

characteristic

Integrated 57m?/50m? MOSFET

Split rails: 1.6V to 17V on PVIN

200kHz to 1.2MHz Switching Frequency

Sync with external clock

0.8V Reference Voltage with ±1% Accuracy_Shutdown Quiescent Current as Low as 2µA

Hiccup Mode Overcurrent Protection

Monotonic Start-up to Prebiased Output

–40°C to 150°C Operating Junction Temperature Range

Pin-to-pin compatible with TPS54620

Adjustable slow start/power sequencing

Provides power good output for undervoltage and overvoltage monitoring

Adjustable Input Undervoltage Lockout (UVLO)

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