TPS6734I
description
The TPS6734 is a fixed 12-V output boost converter capable of delivering 120 m A from inputs as low as 3.75 V. The device is pin-for-pin patible 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 ponents required are: an inductor, a Schottky rectifier, an output filter capacitor, an input filter capacitor, and a small capacitor for loop pensation. The entire converter occupies less than 0.7 in2 of PCB space when implemented with surface-mount ponents. 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-k Hz 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 start-up to minimize the die area needed to realize the 0.7-Ω MOSFET and improve efficiency...
