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 VDDQ supply. 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. APPLICATIONS * DDR Memory * Supports DDR, DDR2, and DDR3 Standards * Tracking Supplies * 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 * VTT Output Voltage Down to 0.5V * Shutdown Current ≤1μA * VTTR = VDDQIN/2, VFB2 = VTTR * Adjustable Switching Frequency Up to 4MHz https://elecena.pl/product/1766216/dual-4mhz-3a-synchronous-buck-converter-for-ddr-termination 2011-07-27 https://elecena.pl/product/1766216/dual-4mhz-3a-synchronous-buck-converter-for-ddr-termination 2017-10-09 https://elecena.pl/product/1766216/dual-4mhz-3a-synchronous-buck-converter-for-ddr-termination 2025-01-21