LT8625S

RECOMMENDED FOR NEW DESIGNS

18V/8A Step-Down Silent Switcher 3 with Ultralow Noise Reference

Data Sheet (Rev. C) Product Selection Table
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Overview

  • Silent Switcher® 3 Architecture
    • Ultralow RMS Noise (10Hz to 100kHz): 4μVRMS
    • Ultralow Spot Noise: 4nV/√Hz at 10kHz
    • Ultralow EMI Emissions on Any PCB
    • Internal Bypass Capacitors Reduce Radiated EMI
  • High Efficiency at High Frequency
  • Ultrafast Transient Response: 1μs
  • Fast Minimum Switch On-Time: 15ns
  • Input Voltage Range: 2.7V to 18V
  • Output Voltage Range: 0V to (PVIN − 0.5V)
  • 8A Maximum Continuous Output Current
  • Precision Reference: ±0.8% Over
    Temperature with Remote Sense
  • Supports Dynamic Output Voltage Control
  • PolyPhase® Operation: Up to 12 Phases
  • Forced Continuous Mode Capability
  • Adjustable and Synchronizable: 300kHz to 4MHz
  • Programmable Power Good
  • Small 20-Lead 4mm × 3mm LQFN Package

The LT8625S synchronous step-down regulator features third-generation Silent Switcher technology which is uniquely designed to combine an ultralow noise reference with Silent Switcher architecture in order to achieve both high efficiency and excellent wideband noise performance.

The innovative ultralow noise architecture provides exceptional low frequency (0.1Hz to 100kHz) output noise performance in a switching regulator. The output voltage can be programmed with a single resistor, resulting in virtually constant output noise independent of output voltage.

Silent Switcher architecture minimizes EMI emissions while delivering high efficiency at high switching frequencies.

The LT8625S is ideal for high current, noise sensitive applications which benefit from the high efficiency of a synchronous switching regulator.

Applications

  • RF Power Suppliers: PLLs, VCOs, Mixers, LNAs, PAs
  • High Speed/High Precision ADCs/DACs
  • Low Noise Instrumentation
LT8625S
18V/8A Step-Down Silent Switcher 3 with Ultralow Noise Reference
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Documentation

Data Sheet 1

Technical Articles 2

Informational 1

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT8625S
  • LT8625SP
  • LT8625SP-1

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

  • LT8625S
  • LT8625SP
  • LT8625SP(INVERTING)
  • LT8625SP-1
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
DC3219A

LT8625S | 18V, 8A Synchronous Step-Down Silent Switcher with Low Noise Reference

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Product Details

Demonstration circuit 3219A is a 18V, 8A synchronous step-down Silent Switcher 3 with ultralow noise, high efficiency and power density featuring the LT8625S. The input voltage range of DC3219A is 2.7V to 18V. The default demo board setting is 1.0V at 8A maximum DC output current. The LT8625S is a compact, ultralow noise, ultralow emission, high efficiency and high speed synchronous monolithic step-down switching regulator. The uniquely designed combination of the ultralow noise reference and the third-generation Silent Switcher architecture enables the LT8625S to achieve both high efficiency and excellent wideband noise performance. Minimum on-time of 15ns allows high VIN to low VOUT conversion at high frequency.
DC3219A
LT8625S | 18V, 8A Synchronous Step-Down Silent Switcher with Low Noise Reference
DC3219A Evaluation Board DC3219A Evaluation Board - Top View DC3219A Evaluation Board - Bottom View

Reference Designs

Intel Agilex 7 FPGA F-series Development Kit (Alternative Monolithic) Power Tree
Intel Agilex 7 FPGA F-series Development Kit (Alternative Monolithic) Power Tree
Intel Agilex 7 FPGA F-series Development Kit (Alternative Monolithic) Circuits from the lab

Altera FPGA

View Detailed Reference Design

Features and Benefits

  • Intel Agilex 7 F-Series devices target a wide range of applications across many markets. This series offers transceiver rates up to 58 Gbps, advanced DSP blocks supporting multiple precisions of fixed-point and floating-point operations, and high-performance crypto blocks.
  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications.
  • Our reference designs are supported by an intuitive design tool set and IP.
  • ADI provides supporting documentation including LTpowerPlanner and applicable LTpowerPlay configuration files to enable you to validate the power solution for your application seamlessly. Our team can provide samples and/or evaluation boards for quick validation that can speed time to market in the most complex applications.
  • For a complete list power designs and use cases, please contact your local FAE.
Intel Agilex 7 FPGA F-series Development Kit (Alternative Monolithic)
Altera FPGA
Intel Agilex 7 FPGA F-series Development Kit (Alternative Monolithic) Power Tree

Latest Discussions

33 Weeks Ago
Question about PCB Layout of LT8625S
36 Weeks Ago
LT8625S powering MGTVCC bank of Xillinx MPSoC
37 Weeks Ago
Question about very high current spike (~8A for ~250ps) in LTspice simulation
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