ANALOG DEVICES LTC3633AEUFD-3#PBF DC-DC Switching Synchronous Buck Regulator, Adjustable, 3.6 to 20V in, 1.5 to 12V / 3A Out, QFN-28

LTC3633AEUFD-3#PBF is a high efficiency, dual-channel monolithic synchronous buck regulator using a controlled on-time, current mode architecture, with phase lockable switching frequency. The two channels can run 180° out of phase to relax the requirements for input and output capacitance. The operating supply voltage range is from 3.6V to 20V, making it suitable for lithium-ion battery stacks as well as point of load power supply applications from a 12V or 5V supply. The operating frequency is programmable from 500KHz to 4MHz with an external resistor and may be synchronized to an external clock signal. The high frequency capability allows the use of small surface mount inductors and capacitors. The unique constant frequency/controlled on time architecture is ideal for high step-down ratio applications that operate at high frequency while demanding fast transient response. Applications include distributed power systems, battery powered instruments, point of load power supplies.

• Input voltage range from 3.6V to 20V, up to 95% efficiency
• Current mode operation for excellent line and load transient response
• 0.6V reference allows low output voltages, short-circuit protected
• Output voltage tracking and soft-start capability, power good status outputs
• Overvoltage input and overtemperature protection
• Minimum on time is 20ns typical at (VON = 0.6V, PVIN = 4V, TJ = 25°C)
• Oscillator frequency is 2MHz typical at (VRT = INTVCC, TJ = 25°C)
• Top switch on-resistance is 130mohm typical at (TJ = 25°C)
• Output voltage range from 1.5V to 1.2V at VON = VOUT, TJ = 25°C
• Operating temperature range from -40°C to 125°C, 28-lead plastic QFN package

Notes

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