LTC3718 Series

Low Input Voltage, DC/DC Controller for DDR/QDR Memory Termination

Catalog

Low Input Voltage, DC/DC Controller for DDR/QDR Memory Termination

Part	Voltage - Output [Min]	Voltage - Output [Max]	Number of Outputs	Voltage - Input [Min]	Voltage - Input [Max]	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Applications	Supplier Device Package	Mounting Type
Analog Devices LTC3718EG#PBF	0.75 V	18 V	1	1.5 V	36 V	85 °C	-40 °C	24-SSOP	Controller DDR QDR	24-SSOP	Surface Mount
Analog Devices LTC3718EG#TRPBF	0.75 V	18 V	1	1.5 V	36 V	85 °C	-40 °C	24-SSOP	Controller DDR QDR	24-SSOP	Surface Mount

Catalog

Low Input Voltage, DC/DC Controller for DDR/QDR Memory Termination

Key Features

• Very Low VIN(MIN): 1.5V

• Ultrafast Transient Response

• True Current Mode Control

• 5V Drive for N-Channel MOSFETs Eliminates Auxillary 5V Supply

• No Sense Resistor Required

• Uses Standard 5V Logic-Level N-Channel MOSFETs

• VOUT(MIN): 0.4V

• VOUTTracks 1/2 VINor External VREF

• Symmetrical Source and Sink Output Current Limit

• Adjustable Switching Frequency

• tON(MIN)<100ns

• Power Good Output Voltage Monitor

• Programmable Soft-Start

• Output Overvoltage Protection

• Optional Short-Circuit Shutdown Timer

• Small 24-Lead SSOP Package

Description

The LTC3718 is a high current, high efficiency synchronous switching regulator controller for DDR and QDR™memory termination. It operates from an input as low as 1.5V and provides a regulated output voltage equal to (0.5)VIN. The controller uses a valley current control architecture to enable high frequency operation with very low on-times without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VINand VOUT. The LTC3718 uses a pair of standard 5V logic level N-channel external MOSFETs, eliminating the need for expensive P-channel or low threshold devices.Forced continuous operation reduces noise and RF interference. Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and an optional short-circuit timer. Soft-start capability for supply sequencing can be accomplished using an external timing capacitor. OPTI-LOOP®compensation allows the transient response to be optimized over a wide range of loads and output capacitors.ApplicationsBus Termination: DDR/QDR Memory, SSTL, HSTL,...Servers, RAID SystemsDistributed Power SystemsSynchronous Buck with General Purpose Boost