TPS6734

TPS6734I FIXED 12-V 120-mA BOOST-CONVERTER SUPPLY D Pin-for-Pin Compatible With MAX734 D Programming Voltage for Flash Memory D 2.7-V to 11-V Input Operating Range D Output Current of 120 mA or Greater From 3.75-V or Higher Input D 3-µA Maximum Supply Current in Shutdown D Only 5 External Components Required D High Efficiency . . . 85% Typical (5-V Input, 120-mA Output) D 8-Pin SOIC and DIP Packages D – 40°C to 85°C Free-Air Operating Temperature Range SLVS127A – AUGUST 1995 – REVISED JANUARY 1999 D OR P PACKAGE (TOP VIEW) EN 1 REF 2 SS 3 COMP 4 8 VCC 7 FB 6 OUT 5 GND description The TPS6734 is a fixed 12-V output boost converter capable of delivering 120 mA from inputs as low as 3.75 V. The device is pin-for-pin compatible with the MAX734 regulator and offers the following advantages: lower supply current, wider operating input-voltage range, and higher output currents. As shown in Figure 1, the only external components required are: an inductor, a Schottky rectifier, an output filter capacitor, an input filter capacitor, and a small capacitor for loop compensation. The entire converter occupies less than 0.7 in2 of PCB space when implemented with surface-mount components. An enable input is provided to shut down the converter and reduce the supply current to 3 µA when 12 V is not needed. The TPS6734 is a 170-kHz current-mode PWM ( pulse-width modulation) controller with an n-channel MOSFET power switch. Gate drive for the switch is derived from the 12-V output after ...