Dual 2-phase synchronous step-down controller is designed for DDR and QDR memory termination supplies. The controller provides VDDQ and VTT outputs, with the second output tracking one-half of the reference voltage and supporting symmetrical source and sink current. No RSENSE current-mode operation eliminates current sense resistors and supports a 2.75 V to 9.8 V input range. The device supports programmable switching to 750 kHz, external synchronization, spread-spectrum operation, internal soft-start, power-good monitoring, and output overvoltage protection. The EUF ordering option uses a 24-lead 4 mm × 4 mm plastic QFN package with an exposed pad.
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| Controller topology | Dual 2-phase synchronous step-down |
| Target application | DDR/QDR memory termination |
| Input supply voltage range | 2.75 to 9.8V |
| Absolute maximum input supply voltage | 10V |
| Operating temperature range | -40 to 85°C |
| Storage temperature range | -65 to 125°C |
| Junction temperature maximum | 125°C |
| Normal operating supply current | 575 typ, 850 maxµA |
| Shutdown supply current | 9 typ, 20 maxµA |
| Undervoltage lockout threshold falling | 1.95 min, 2.25 typ, 2.55 maxV |
| Undervoltage lockout threshold rising | 2.15 min, 2.45 typ, 2.75 maxV |
| VFB1 regulated feedback voltage | 0.6 typV |
| VFB1 reference accuracy | ±1.5 from 0°C to 85°C% |
| VFB2 regulated feedback voltage at VREF=2.5V | 1.250 typV |
| Top gate drive rise time | 40 typ with 3000pF loadns |
| Bottom gate drive rise time | 50 typ with 3000pF loadns |
| Oscillator frequency floating PLLLPF | 550 typkHz |
| Oscillator frequency PLLLPF tied high | 750 typkHz |
| Synchronization frequency range | 250 to 850 typkHz |
| Package thermal resistance θJA | 37°C/W |
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These are design resources that include the Linear Technology LTC3776EUF
A 2-phase dual step-down DC/DC converter for DDR/QDR memory termination using the LTC3776EUF, supporting 2.75V-8V input and dual outputs of 2.5V and 1.25V.
