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LTC3618 Datasheet(PDF) 1 Page - Linear Integrated Systems |
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LTC3618 Datasheet(HTML) 1 Page - Linear Integrated Systems |
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1 / 24 page  LTC3618 1 3618fb TYPICAL APPLICATION DESCRIPTION Dual 4MHz, ±3A Synchronous Buck Converter for DDR Termination The LTC®3618 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.AbufferedreferencegeneratesVTTR 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 deliv- ering ±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. Efficiency and Power Loss vs Load Current FEATURES APPLICATIONS n DDR Power Supply, Termination and Reference n High Efficiency: Up to 94% n Dual Outputs with ±3A Output Current Capability n 2.25V to 5.5V Input Voltage Range n ±1% Output Voltage Accuracy n VTT Output Voltage Down to 0.5V n Shutdown Current ≤1μA n VTTR = VDDQIN/2, VFB2 = VTTR n Adjustable Switching Frequency Up to 4MHz n Internal or External Compensation n Selectable 0°/90°/180° Phase Shift Between Channels n Internal or External Soft-Start for VDDQ, Internal Soft-Start for VTT n Power Good Status Outputs n Low Profile 4mm × 4mm QFN-24 and TSSOP-24 Packages n DDR Memory n Supports DDR, DDR2, and DDR3 Standards n Tracking Supplies L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 6498466, 6580258, 6611131. LOAD CURRENT (A) 30 90 10 1 0.1 0.01 100 20 10 80 50 70 60 40 10 3618 TA01b 0 0.1 1 0.01 VDDQ = 1.8V VTT = 0.9V SW1 VDDQIN FB1 LTC3618 3618 TA01a SGND PGND RUN1 TRACK/SS1 ITH1 PHASE RUN2 PGOOD2 ITH2 PGOOD1 VTTR RT MODE/SYNC VIN 3.3V SVIN PVIN1 PVIN2 100μF 0.01μF SW2 FB2 1μH 47μF VTT 0.9V/±3A 1μH 47μF VDDQ 1.8V/3A 422k 210k 392k VREF = VDDQ 2 |
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