LTC3618 Series

Dual 4MHz, ±3A Synchronous Buck Converter for DDR Termination

Catalog

Dual 4MHz, ±3A Synchronous Buck Converter for DDR Termination

Part	Applications	Supplier Device Package	Voltage - Input [Min]	Voltage - Input [Max]	Voltage - Output	Package / Case	Package / Case	Package / Case [y]	Operating Temperature [Max]	Operating Temperature [Min]	Number of Outputs	Mounting Type
Analog Devices LTC3618IFE	Converter DDR	24-TSSOP	2.25 V	5.5 V	0.5 V	0.173 in	24-TSSOP Exposed Pad	4.4 mm	125 °C	-40 °C	2	Surface Mount
Analog Devices LTC3618IFE#PBF	Converter DDR	24-TSSOP	2.25 V	5.5 V	0.6 V	0.173 in	24-TSSOP Exposed Pad	4.4 mm	125 °C	-40 °C	2	Surface Mount
Analog Devices LTC3618EFE#PBF	Converter DDR	24-TSSOP	2.25 V	5.5 V	0.6 V	0.173 in	24-TSSOP Exposed Pad	4.4 mm	125 °C	-40 °C	2	Surface Mount
Analog Devices LTC3618EUF#TRPBF	Converter DDR	24-QFN (4x4)	2.25 V	5.5 V	0.6 V		24-WFQFN Exposed Pad		125 °C	-40 °C	2	Surface Mount
Analog Devices LTC3618IUF	Converter DDR	24-QFN (4x4)	2.25 V	5.5 V	0.5 V		24-WFQFN Exposed Pad		125 °C	-40 °C	2	Surface Mount
Analog Devices LTC3618EFE#TRPBF	Converter DDR	24-TSSOP	2.25 V	5.5 V	0.6 V	0.173 in	24-TSSOP Exposed Pad	4.4 mm	125 °C	-40 °C	2	Surface Mount
Analog Devices LTC3618EFE	Converter DDR	24-TSSOP	2.25 V	5.5 V	0.5 V	0.173 in	24-TSSOP Exposed Pad	4.4 mm	125 °C	-40 °C	2	Surface Mount

Key Features

• DDR Power Supply, Termination and Reference

• High Efficiency: Up to 94%

• Dual Outputs with ±3A Output Current Capability

• 2.25V to 5.5V Input Voltage Range

• ±1% Output Voltage Accuracy

• VTTOutput Voltage Down to 0.5V

• Shutdown Current ≤1μA

• VTTR = VDDQIN/2, VFB2= VTTR

• Adjustable Switching Frequency Up to 4MHz

• Internal or External Compensation

• Selectable 0°/90°/180° Phase Shift Between Channels

• Internal or External Soft-Start for VDDQ, Internal Soft-Start for VTT

• Power Good Status Outputs

• Low Profile 4mm × 4mm QFN-24 and TSSOP-24 Packages

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC3618 is a dual synchronous step-down regulator using a current mode, constant-frequency architecture. It provides a complete DDR solution with an input voltage range from 2.25V to 5.5V.The output of the first step-down regulator offers a high accuracy VDDQsupply. A buffered reference generates VTTR at 50% of VDDQIN and drives loads up to ±10mA. The second regulator generates the DDR termination voltage (VTT) equal to VTTR. Both regulators are capable of delivering ±3A of load current at 1MHz switching frequency.The operating frequency is externally programmable up to 4MHz, allowing the use of small surface mount inductors. 0°, 90°, or 180° of phase shift between the two channels can be selected to minimize input current ripple. For switching noise-sensitive applications, the LTC3618 can be synchronized to an external clock up to 4MHz.The LTC3618 is offered in leadless 24-pin 4mm × 4mm QFN and thermally enhanced 24-pin TSSOP packages.APPLICATIONSDDR MemorySupports DDR, DDR2, and DDR3 StandardsTracking Supplies