Regulators offered in H & Military MP grade to +150°C

20th December 2013

Staff Reporter

0 0

Datasheet

Incorporating a constant frequency and current-mode architecture, the LTC3615 and LTC3615-1 are now offered in H grade and military MP grade versions. The Linear 4MHz synchronous buck regulators feature low resistance internal switches, which deliver up to 3A of continuous output current from each channel while its low dropout operation provides an output voltage ranging from 0.6V to just millivolts below V_IN.

Operating an input voltage of 2.25V to 5.5V, the regulators are suitable for single-cell Li-Ion applications as well as 3.3V and 5V intermediate bus systems. Its switching frequency is user programmable from 400kHz to 4MHz, enabling the use of tiny, low cost capacitors and inductors. The LTC3615 offers selectable 0°/90°/180° phase shift while the LTC3615-1 offers selectable 140°/180° phase shift between channels. The combination of its fast switching capability and the very small 4mm x 4mm QFN-24, or thermally enhanced TSSOP-24, offer a compact solution footprint for applications requiring dual outputs up to 3A.

The internal switches featured in the regulators use R_DS(ON) of only 55mOhms and 75mOhms to deliver efficiencies up to 94%. The no-load quiescent current is reduced to only 130µA, due to Burst Mode operation, which maximises both light-load efficiency and run time in battery-powered applications. An adjustable Burst Mode clamp enables designers to optimize light load efficiency. For applications requiring the lowest possible noise, the LTC3615 can be configured to run in either pulse-skipping or forced continuous modes, reducing noise and potential RF interference. Programmable switching slew rates further reduce potential noise concerns. Selectable 0°, 90° or 180° of phase shift between its two channels minimize input current ripple as well as output voltage ripple. The LTC3615 offers inputs for tracking capability as well as a DDR memory mode in which the device can source/sink ±1.5A. Additional features include optional active voltage positioning (AVP), a Power Good voltage monitor, external synchronization capability and thermal protection.

The H grade versions are guaranteed to meet specifications over the -40°C to 150°C operating junction temperature range and are priced at $5.00 and $5.35 each, respectively in 1,000-piece quantities. The military MP grade versions are guaranteed to meet specifications over the -55°C to 150°C operating junction temperature range and are priced at $12.55 and $13.00 each, respectively in 1,000-piece quantities.