Linear Technology announces the new high-reliability, 4-MHz synchronous buck regulators, the LTC3615 and the LTC3615-1, new high-reliability Class H and MP MP versions built on a constant-frequency, current-mode architecture. The low-resistance internal switches allow the LTC3615 to deliver up to 3A of continuous output current per channel, while its low dropout operation provides output voltages ranging from 0.6V to a few millivolts below VIN. Operating from an input voltage range of 2.25V to 5.5V, the LTC3615 is ideal for single-cell Li-Ion battery applications and 3.3V and 5V intermediate bus systems. Its switching frequency is user-programmable from 400kHz to 4MHz, allowing the use of tiny and low cost capacitors and inductors. The LTC3615 offers an optional phase shift between 0 ° / 90 ° and 180 ° channels, while the LTC3615-1 offers an optional 140 ° / 180 ° phase shift. Its fast switching capability combined with a very small 4mm x 4mm QFN-24 package or thermally enhanced TSSOP-24 package provides a very compact solution footprint for dual output applications requiring up to 3A. The LTC3615 uses internal switches with RDS (ON) of only 55mΩ and 75mΩ, providing up to 94% efficiency. Burst Mode operation reduces the quiescent current at no load to only 130μA, maximizing light-load efficiency and extending the run-time of battery-powered applications. An adjustable burst mode clamp allows designers to optimize light load efficiency. For applications that require the lowest possible noise, the LTC3615 can be configured to operate in either pulse-skipping or forced continuous mode, reducing noise and potential RF interference. Programmable switching slew rate further mitigates potential noise issues. The optional 0 °, 90 ° or 180 ° phase shift between the two channels minimizes input current ripple and output voltage ripple. The LTC3615 provides input for tracking capability and DDR memory mode, which provides / sinks ± 1.5A in this mode. Other features include optional active voltage location (AVP), power good voltage monitor, external synchronization capability and thermal protection. The LTC3615 and LTC3615-1 are available in a 4mm x 4mm QFN-24 package and a 24-lead thermally enhanced TSSOP package. H-Reliable High-Grade versions are guaranteed to meet performance specifications in the operating junction temperature range of -40 ° C to 150 ° C and are priced at $ 5 and $ 5.35 respectively. Military MP grade version of the work in the -55 ℃ to 150 ℃ junction temperature range to ensure performance specifications to meet the 1,000-piece purchase price was 12.55 US dollars and 13 US dollars. All versions are available from stock. Linear offers synchronous buck regulators LTC3615 and LTC3615-1 Dual 3A, 4MHz Monolithic Synchronous Step-Down Regulator Summary of Features: LTC3615 and LTC3615-1 Operating Junction Temperature Range (MP) from -55 ° C to + 150 ° C, Operating Junction Temperature Range (H-Class) from -40 ° C to + 150 ° C High efficiency: up to 94% Dual output with 2 x 3A output current capability DDR storage mode IOUT = ± 1.5A Low Output Ripple Burst Mode Operation: IQ = 130μA 2.25V to 5.5V input voltage range Low dropout operation: 100% duty cycle Output voltage as low as 0.6V 1.33% output voltage accuracy Programmable slew rate on the switch pin Shutdown current ≤1μA Adjustable switching frequency up to 4MHz Internal or external compensation Burst Mode Operation Selectable Pulse Skip / Forced Continuous / Burst-Mode with Adjustable Burst Optional Active Voltage Positioning with Internal Compensation Optional 0 ° / 90 ° / 180 ° (LTC3615) or optional 140 ° / 180 ° (LTC3615-1) Phase Shift Between Channels Fixed internal and programmable external soft-start Accurate start tracking ability Available in thermally enhanced 4mm x 4mm QFN-24 and TSSOP-24 packages Kitchen Utensils Production Cutting Machine
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