LTC3634IUFD#PBF

LTC3634 is a high efficiency, dual-channel monolithic synchronous step-down regulator which provides power supply and bus termination rails for DDR1, DDR2, and DDR3 SDRAM controllers. 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. It is widely used in application like DDR memory power supplies etc.

• Input voltage range is 3.6V to 15V
• ±3A output current per channel
• Upto 95% efficiency, VTTR = VDDQ/2 = VTT reference
• Optimal VOUT range is 0.6V to 3V, power good status outputs
• ±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
• Operating temperature is -40°C to 125°C
• Package style is 28-lead plastic QFN

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