Negative 5-V 200-mA Output (VCC ≥ 4.5 V)

4-V to 6.2-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 μA

Soft Start

8-Pin SOIC and DIP Packages

−40°C to 85°C Free-Air Temperature Range

Pin-for-Pin Compatible with MAX735

description

The TPS6735 is a fixed negative 5-V output inverting dc/dc converter capable of delivering 200 mA from inputs

as low as 4.5 V. 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 −5-V output is not needed. The typical supply current is 1.9 mA at no-load and is further reduced

to 1-μA when the enable input is low.

The TPS6735 is a 160-kHz current-mode pulse-width-modulation (PWM) controller with a p-channel MOSFET

power switch. The gate drive uses the −5-V output to reduce the die area needed to realize the 0.4-Ω 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 μA.

The TPS6735 is attractive for board-level dc/dc conversion in computer peripherals and in battery-powered

equipment requiring high efficiency and low supply current.

The TPS6735 is available in 8-pin DIP and SOIC packages and operates over a free-air temperature range of

−40°C to 85°C.