描述 Description

The TPS6755 is an adjustable inverting dc/dc converter capable of operating from inputs as low as 2.7 V. The only external components required are an inductor, an output filter capacitor, an input filter capacitor, a reference filter capacitor, two resistors, and a Schottky rectifier. An enable input is provided to shut down the inverter when an output voltage is not needed. The typical supply current is 1.9 mA at no-load and is further reduced to 1-uA when the enable input is low. The device features a 160-kHz current-mode pulse-width-modulation (PWM) controller with a p-channel MOSFET power switch. The gate drive uses the converter output to reduce the die area needed to realize the 0.4-MOSFET. Soft start is accomplished with the addition of one small capacitor at SS. A 1.22-V reference is available for external loads up to 125 uA. The TPS6755 is attractive for board-level dc/dc conversion in computer peripherals and in battery-powered equipment requiring high efficiency and low supply current. Available in an 8-pin DIP or an 8-pin SOIC package, the TPS6755 operates over a free-air temperature range of - 40°C to 85°C.

特性 Features

? 1-W Output (VCC >= 4.5 V)
? 2.7-V to 9-V Input Operating Range
? 78% Typical Efficiency
? 160-kHz Fixed-Frequency Current-Mode PWM Controller
? EN Input Inhibits Operation and Reduces Supply Current to 1 uA
? Output Voltage Limited to VO CC
? Soft Start
? 8-Pin SOIC and DIP Packages
? -40°C to 85°C Free-Air Temperature Range
? Pin-for-Pin Compatible with MAX755