LTC3831-1

PRODUCTION

High Power Synchronous Switching Regulator Controller for DDR Memory Termination

Analog Devices LTC3831-1 Product Info

10 February 2026 5

Features

V_OUT as Low as 0.4V
High Power Switching Regulator Controller for DDR Memory Termination
V_OUT Tracks 1/2 of V_IN or External V_REF
No Current Sense Resistor Required
Low V_CC Supply: 3V to 8V
Maximum Duty Cycle > 91% Over Temperature
Drives All N-Channel External MOSFETs

High Efficiency: Up to 95%
Programmable Fixed Frequency Operation: 100kHz to 500kHz
External Clock Synchronization Operation
Programmable Soft-Start
Low Shutdown Current: <10µA
Overtemperature Protection
Available in 16-Pin Narrow SSOP Package

Part details & applications

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.

	Feedback Voltage	Accuracy Over Temp
LTC3831	1.25V	1.5%
LTC3831-1	0.75V	1.6%

Applications

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