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LTC3831

Analog Devices

LTC3831 RSS Sample
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Kod:
LTC3831
Producent:
ANALOG DEVICES
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The LTC3831 is a high power, high efficiency switching regulator controller designed for DDR memory termination. The LTC3831 generates an output voltage equal to 1/2 of an external supply or reference voltage. The LTC3831 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 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 200kHz free-running clock frequency can be externally adjusted or synchronized with an external signal from 100kHz to above 500kHz. In shutdown mode, the LTC3831 supply current drops to <10µA.

Feedback Voltage

Accuracy Over Temp

LTC3831

1.25V

1.5%

LTC3831-1

0.75V

1.6%

* DDR SDRAM Termination

* SSTL2 Interface

* SSTL3 Interface

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