LTC3614EUDD#TRPBF

LTC®3614 is a low quiescent current monolithic synchronous buck regulator using a current mode, constant frequency architecture. The no-load DC supply current in sleep mode is only 75µA while maintaining the output voltage (burst mode operation) at no load, dropping to zero current in shutdown. The 2.25V to 5.5V input supply voltage range makes this ideally suited for single Li-Ionaswell as fixed low voltage input applications. 100% duty cycle capability provides low dropout operation, extending the operating time in battery-powered systems. The operating frequency is externally programmable up to 4MHz, allowing the use of small surface mount inductors. The internal synchronous switch increases efficiency and eliminates the need for an external catch diode, saving external components and board space. Typical applications are point-of-load supplies, distributed power supplies, portable computer systems, DDR memory termination, handheld devices.

• Forced continuous mode operation in this reduces noise and RF interference
• Can be synchronized to an external clock at up to 4MHz
• Low output ripple Burst Mode® operation is IQ=75µA, ±1% output voltage accuracy
• Output voltage down to 0.6V, high efficiency is up to 95%
• Low dropout operation is 100% duty cycle, programmable slew rate on SW node reduces noise and EMI
• Selectable pulse-skipping/forced continuous/burst mode operation with adjustable burst clamp
• Programmable soft-start, inputs for start-up tracking or external reference
• Feedback input current is ±30nA (VFB=0.6V, TA=25°C, VIN=3.3V, RT/SYNC=SVIN)
• 24-lead plastic QFN package
• Temperature rating range from -40°C to 125°C

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