36-VIN, 600-mA uModule step-down regulator consumes 5-uA quiescent current

May 09, 2012 // By Paul Buckley
Linear Technology Corporation has introduced a 5 µA quiescent current DC/DC step-down µModule regulator with low dropout voltage and a wide input and output voltage range of operation.

Capable of delivering up to 600 mA, the LTM8029 prolongs battery run time and features a 5 µA quiescent current consumption during standby mode and only 0.9 µA in shutdown discharges a little current from the battery,

The device offers a low 0.6 V dropout (at 600 mA) conversion that permits longer operating time as the battery’s operating voltage drops to a value close to the output voltage.

The wide range of operating voltage of 4.5 V to 36 V (40 Vmax) input and 1.2 V to 18 V output, enable the LTM8029’s use in such applications as avionics, heavy industrial equipment, battery stack energy storage and factory automation and robotics.

The LTM8029 includes the inductor, power switches, DC/DC controller and additional circuitry in a small 6.25mm x 11.25mm x 3.42mm BGA package. Efficiency of operation for 3.3 V OUT , at 600 mA from 5 V IN , 12 V IN , and 24 V IN is 84%, 79% and 75%, respectively. Rise in junction temperature is minimal at only 17°C, when converting from 36V IN to 3.3 V OUT at full current of 600 mA.

The LTM8029 has adjustable switching frequency from 200kHz to 2.2 MHz, useful for applications that must maintain switching noise within a certain range. In addition to positive-to-positive, the LTM8029 can be used to regulate a negative output voltage. Pricing starts at $6.60 each for 1,000-piece quantities.

More information about the LTM8029 DC/DC step-down µModule regulator at
www.linear.com/product/LTM8029