ANALOG DEVICES LTC3728EUH#TRPBF DC/DC Switching Regulator, Synchronous Buck, 2 Output, 3.5 to 36V in, 5/3.3V/25A out, 550kHz

LTC3728 is a dual high performance step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant-frequency current mode architecture allows phase-lockable frequency of upto 550KHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are compatible with future microprocessor generations, and a wide 3.5V to 30V (36V maximum) input supply range encompasses all battery chemistries. A RUN/SS pin for each controller provides both softstart and optional timed, short-circuit shutdown. It is widely used in application such as notebook and palmtop computers, telecom systems, portable instruments, battery-operated digital devices, DC power distribution systems etc.

• Dual, 180° phased controllers reduce required input capacitance and power supply induced noise
• ±1% output voltage accuracy, power good output voltage indicator
• Dual N-channel MOSFET synchronous drive, very low dropout operation is 99% duty cycle
• Adjustable soft-start current ramping, foldback output current limiting
• Latched short-circuit shutdown with defeat option
• Output overvoltage protection, remote output voltage sense
• Low shutdown current is 20?A typical at (VRUN/SS1, 2 = 0V, TA = 25°C)
• 5V and 3.3V regulators, nominal frequency is 400KHz typ at (VPLLFLTR = 1.2V)
• Operating temperature is -40°C to 85°C
• Package style is 32-lead plastic QFN

Notes

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