LTC3831 Series

High Power Synchronous Switching Regulator Controller for DDR Memory Termination

Catalog

High Power Synchronous Switching Regulator Controller for DDR Memory Termination

Part	Number of Outputs	Mounting Type	Package / Case	Package / Case	Package / Case	Applications	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Voltage - Input [Max]	Voltage - Input [Min]	Voltage - Output [Min]	Voltage - Output [Max]
Analog Devices LTC3831IGN#PBF	1	Surface Mount	0.154 in	16-SSOP	3.9 mm	Controller DDR	85 °C	-40 °C	16-SSOP	8 VDC	3 V	1.27 V	4 V
Analog Devices LTC3831IGN#TRPBF	1	Surface Mount	0.154 in	16-SSOP	3.9 mm	Controller DDR	85 °C	-40 °C	16-SSOP	8 VDC	3 V	1.27 V	4 V
Analog Devices LTC3831EGN#TRPBF	1	Surface Mount	0.154 in	16-SSOP	3.9 mm	Controller DDR	85 °C	-40 °C	16-SSOP	8 VDC	3 V	1.27 V	4 V

Catalog

High Power Synchronous Switching Regulator Controller for DDR Memory Termination

Key Features

• High Power Switching Regulator Controller for DDR Memory Termination

• VOUTTracks 1/2 of VINor External VREF

• No Current Sense Resistor Required

• Low Input Supply Voltage Range: 3V to 8V

• Maximum Duty Cycle >91% Over Temperature

• Drives All N-Channel External MOSFETs

• High Efficiency: Over 95% Possible

• Programmable Fixed Frequency Operation:100kHz to 500kHz

• 100kHz to 500kHz

• External Clock Synchronization Operation

• Programmable Soft-Start

• Low Shutdown Current: <10µA

• Overtemperature Protection

• Available in 16-Pin Narrow SSOP Package

Description

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 VoltageAccuracy Over TempLTC38311.25V1.5%LTC3831-10.75V1.6%ApplicationsDDR SDRAM TerminationSSTL_2 InterfaceSSTL_3 Interface