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Linear's Synchronous Step-Down Regulator
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Tuesday, March 16, 2010:
The LTC3616 is a high efficiency, 4MHz synchronous buck regulator from Linear Technology that incorporates a constant frequency, current mode architecture. Low resistance internal switches allow the LTC3616 to deliver up to 6A of continuous output current from a 3mm x 5mm QFN package and its low dropout operation allows the output voltage to range from 0.6V to just millivolts below VIN. The LTC3616 operates from an input voltage of 2.25V to 5.5V, making it ideal for single-cell Li-Ion applications as well as 3.3V or 5V intermediate bus systems. Its switching frequency is user programmable from 300kHz to 4MHz, enabling the use of tiny, low cost capacitors and inductors.
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The LTC3616 uses internal switches with RDS(ON) of only 25mOhms and 35mOhms to deliver efficiencies of up to 95%. Burst Mode® operation reduces no-load quiescent current to only 75µA, maximizing 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 LTC3616 can be configured to run in either pulse-skipping or forced continuous modes, reducing noise and potential RF interference. Additionally, programmable switching slew rates can further reduce potential noise concerns. The LTC3616 also offers inputs for tracking capability as well as a DDR memory mode in which the device can source/sink ±3A. Additional features include optional active voltage positioning, a Power Good voltage monitor, external synchronization capability and thermal protection.
The LTC3616EUDD is available in a 3mm x 5mm QFN-2. Pricing starts at $3.80 each in 1,000-piece quantities. An industrial grade version, the LTC3616IUDD, is guaranteed to meet specifications over the -40°C to 125°C operating junction temperature range and is priced at $4.47 each in 1,000-piece quantities. For more information, visit www.linear.com.
Summary Features LTC3616
6A Output Current
2.25V to 5.5V Input Voltage Range
Low Output Ripple (<20mVPK-PK) Burst Mode® Operation: IQ = 75µA
±1% Output Voltage Accuracy
Output Voltage Down to 0.6V
High Efficiency: Up to 95%
Low Dropout Operation: 100% Duty Cycle
Programmable Slew Rate on SW Node Reduces Noise & EMI
Adjustable Switching Frequency: Up to 4MHz
Optional Active Voltage Positioning (AVP) with Internal Compensation
Selectable Pulse-Skipping/Forced Continuous/Burst Mode Operation with Adjustable Burst Clamp
Programmable Soft-Start
Inputs for Start-Up Tracking or External Reference
DDR Memory Mode, IOUT = ±3A
Available in a 24-Pin 3mm × 5mm QFN Thermally Enhanced Package
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