Linear Technology’s latest controlled on-time dual output synchronous step-down DC/DC controller has differential output voltage sensing and clock synchronisation. The controlled on-time, valley current-mode architecture is designed to give a fast transient response by increasing its operating frequency during a transient event.

The result is the LTC3838 can recover from a large load step in only a few clock cycles.

The operating frequency is selectable from 200kHz to 2MHz or can be synchronised to an external clock. A low 30ns minimum on-time allows for a high step-down ratio power supply at very high operating frequencies.

The LTC3838 operates over a 4.5V to 38V input voltage range.

Onboard N-channel mosfet gate drivers allow the use of high power external mosfets for output currents up to 25A per channel, at output voltages ranging from 0.6V to 5.5V, so meeting point-of-load requirements.

The device’s differential amplifier provides true remote output voltage sensing of both the positive and negative terminals, enabling accurate regulation independent of board IR losses (up to ±500mV).

It is available in thermally enhanced 5mm x 7mm QFN-38 or TSSOP-38 packages.

For more information, see http://www.linear.com/product/LTC3838.