Milpitas, Calif.—Linear Technology's LTC3827, a 2-phase dual output synchronous step-down DC/DC controller, features extremely low operating current— as little as 80 microamps (one output active) and 115 microamps (both outputs active). As such, it's especially suited to automotive applications where supplies must remain on to power system electronics although the engine is off.
The controller, working from a 4-36 volt input, delivers a 0.8 to 10-volt output to drive the higher voltage supplies typically used to power audio systems, analog tuners, and CD/DVD players. Each chip output delivers up to 20 amps; efficiency is as high as 95 percent. The LTC3827’s constant-frequency, current-mode architecture provides a line regulation of better than 0.02 percent per volt, load regulation of 0.5 percent (worst case), and ±1 percent voltage accuracy. Its 2-phase operation reduces input capacitance requirements. The chip operates at a selectable frequency between 250 and 550 kHz, and can be synchronized to an external clock from 140 kHz to 650 kHz using its phase-locked loop (PLL). Output over-voltage and over-current (short circuit) protection are provided internally.
The LTC3827 is rated for operation from -40 to +85°C (ambient). Click here for the datasheet. The LTC3827, offered in two package types (28-lead SSOP and a 5-by-5 mm 32-pin QFN), is priced at $5 each in 1k quantities.
Linear Technology, 1-800-4LINEAR, www.linear.com