LTC3634EFE#PBF

LTC3634EFE#PBF is a high-efficiency, dual-channel monolithic synchronous step-down regulator that provides power supply and bus termination rails for DDR1, DDR2, and DDR3 SDRAM controllers. The operating input voltage range is 3.6V to 15V, making it suitable for point-of-load power supply applications from a 5V or 12V input, as well as various battery-powered systems. The VTT-regulated output voltage is equal to VDDQIN•0.5. An on-chip buffer capable of driving a 10mA load provides a low noise reference output (VTTR) also equal to VDDQIN•0.5. The operating frequency is programmable and synchronizable from 500KHz to 4MHz with an external resistor. The two channels can operate 180° out-of-phase, which relaxes the requirements for input and output capacitance. The unique controlled on-time architecture is ideal for powering DDR applications from a 12V supply at high switching frequencies, allowing the use of smaller external components. Application include DDR memory power supplies.

• Input voltage range from 3.6V to 15V, power good status outputs
• Input overvoltage and overtemperature protection, short-circuit protected
• Current mode operation for excellent line and load transient response
• External clock synchronization, up to 95% efficiency
• Active input DC supply current is 1.3mA typical at (RUN1 = RUN2 = VIN, TA = 25°C)
• Oscillator frequency is 2MHz typical at (VRT = INTVCC, TA = 25°C)
• Switch leakage current is ±1µA maximum at (VIN = 15V, VRUN = 0V, TA = 25°C)
• Minimum on-time is 20ns typical at (VON = 0.5V, VIN = 4V, TA = 25°C)
• Shutdown current is 15µA typical at (RUN1 = RUN2 = 0V, TA = 25°C)
• Operating junction temperature range from -40°C to 125°C, 28-lead plastic TSSOP package

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party