LTC3634HUFD#PBF

LTC3634HUFD#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. Applications include DDR memory power supplies.

• Operating supply range from 3.6 to 15V
• Output voltage range from 0.6 to 3V (VON = VOUT, TA = 25°C), up to 95% efficiency
• PGOOD hysteresis is 125mV typical at (VFB from bad-to-good, TA = 25°C)
• Oscillator frequency is 2MHz (VRT = INTVCC, TA = 25°C)
• VTTR = VDDQ/2 = VTT reference, ±1.6% accurate VTTR at 0.75V
• ±10mA buffered output supplies VREF reference voltage
• Current mode operation for excellent line and load transient response
• External clock synchronization, short-circuit protected
• Input overvoltage and overtemperature protection, power good status outputs
• 28-lead QFN package, operating temperature range from -40°C to 150°C

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