The TPS6735ID is a Fixed Negative 5V Inverting DC-DC Converter capable of delivering 200mA from inputs as low as 4.5V. The only external components required are an inductor, an output filter capacitor, an input filter capacitor, a reference filter capacitor and a Schottky rectifier. An enable input is provided to shut down the inverter when a -5V output is not needed. The typical supply current is 1.9mA at no-load and is further reduced to 1μA when the enable input is low. The TPS6735 is a 160kHz current-mode PWM controller with a P-channel MOSFET power switch. The gate drive uses the -5V output to reduce the die area needed to realize the 0.4R MOSFET. Soft start is accomplished with the addition of one small capacitor at SS. A 1.22V reference is available for external loads up to 125μA. It is attractive for board-level DC/DC conversion in computer peripherals and in battery-powered equipment requiring high efficiency and low supply current.
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