LTC38311

The LTC3831-1 is a high power, high efficiency switching regulator controller designed for DDR memory termination. The LTC3831-1 generates an output voltage equal to 1/2 of an external supply or reference voltage. The LTC3831-1 uses a synchronous switching architecture with N-channel MOSFETs. Additionally, the chip senses output current through the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without a current sense resistor. The LTC3831-1 operates with input supply voltage as low as  3V and with a maximum duty cycle of >91%. It includes a fixed frequency PWM oscillator for low output ripple operation. The 300kHz free-running clock frequency can be externally adjusted or synchronized with an external signal from 100kHz to above 500kHz. In shutdown mode,the LTC3831-1 supply current drops to <10µA.

The LTC3831-1 has many features such as following mentioned: 1.VOUT as Low as 0.4V; 2.High Power Switching Regulator Controller for DDR Memory Termination; 3.VOUT Tracks 1/2 of VIN or External VREF; 4.No Current Sense Resistor Required; 5.Low VCC Supply: 3V to 8V; 6.Maximum Duty Cycle >91% Over Temperature; 7.Drives All N-Channel External MOSFETs; 8.High Efficiency: Up to 95; 9.Programmable Fixed Frequency Operation:100kHz to 500kHz; 10.External Clock Synchronization Operation; 11.Programmable Soft-Start; 12.Low Shutdown Current: <10µA; 13.Overtemperature Protection; 14.Available in 16-Pin Narrow SSOP Package.

Here are some absolute maximum ratings of LTC3831-1: 1.Supply Voltage(Vcc) is 9V, PVCC1,2 is 14V; 2.Input Voltage(IFB, IMAX) is 0.3V to 14V, R+, R, FB, SHDN, FREQSET is0.3V to VCC + 0.3V; 3.Junction Temperature is  125°C; 4.Operating Temperature Range is40°C to 85°C; 5.Storage Temperature Rang is65°C to 150°C; 6.Lead Temperature is 300°C.