LT8624S

RECOMMENDED FOR NEW DESIGNS

18V, 4A Step-Down Silent Switcher 3 with Ultralow Noise Reference

Data Sheet (Rev. C) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.40

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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: 12ns
Input Voltage Range: 2.7V to 18V

Output Voltage Range: 0V to (PV_IN - 0.5V)
2A/4A Maximum Continuous Output Current
Precision Reference: ± 0.8% Over Temperature with Remote Sense
PolyPhase® Operation: Up to 12 Phases
Forced Continuous Mode Capability
Adjustable and Synchronizable: 300kHz to 6MHz
Programmable Power Good
Small 20-Lead 4mm x 3mm LQFN Package

The LT^®8622S/LT^®8624S 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 LT8622S/LT8624S is ideal for high-current, noise- sensitive applications that benefit from the high efficiency of a synchronous switching regulator.

Applications

RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
High Speed/High Precision ADCs/DACs
Low Noise Instrumentation

Part Models: 2
1ku List Price: Starting From $3.40

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT8624SAV#PBF	20-Lead LQFN (4mm x 3mm x 0.94mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8624SAV#TRPBF	20-Lead LQFN (4mm x 3mm x 0.94mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT8624S

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT8624S

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

LT8624S 18V, 4A Synchronous Step-Down Silent Switcher with Ultra-Low Noise Reference

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Product Details

The demonstration circuit EVAL-LT8624S-AZ is an 18V, 4A synchronous step-down Silent Switcher 3 with ultra-low noise, high efficiency, and power density featuring the LT8624S. The input voltage range of EVAL-LT8624S-AZ is 2.7V to 18V. The default demo board setting is 1.0V at 4A maximum DC output current. The LT8624S is a compact, ultra-low noise, ultra-low emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The uniquely designed combination of the ultra-low noise reference and third-generation Silent Switcher architecture enables the LT8624S to achieve both high efficiency and excellent wideband noise performance. Minimum on-time of 12ns allows high V_IN to low V_OUT conversion at high frequency.

Resources

LT8624S 18V, 4A Synchronous Step-Down Silent Switcher with Ultra-Low Noise Reference (Rev.A)
5/21/2024

EVAL-LT8624S Design Files
1/1/0001

LT8624S 18V, 4A Synchronous Step-Down Silent Switcher with Ultra-Low Noise Reference Used as an IBB Converter

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Product Details

The EVAL-LT8624S-AZ-IBB demonstration board is the inverting buck-boost topology version of the LT8624S, an 18V, 4A synchronous Silent Switcher^®3 step-down regulator with ultra-low noise, high efficiency, and power density. The input voltage range of the EVAL-LT8624SAZ-IBB is 2.7V to (18V - |V_OUT|). The default demo board setting is -5V for a 2A maximum DC output current with a 5V input, or a 4A maximum DC output current with a 12V input. The LT8624S is a compact, ultra-low noise, ultra-low emission, high efficiency, and high-speed synchronous monolithic step-down switching regulator used as an inverting buck-boost converter. The uniquely designed combination of the ultra-low noise reference and third-generation Silent Switcher architecture enables the LT8624S to achieve both high efficiency and excellent wideband noise performance. A minimum on-time of 12ns allows high V_IN to low V_OUT conversion at high frequency.

Resources

EVAL-LT8624S-AZ-IBB User Guide (Rev.A)
1/1/0001

Reference Designs

Intel Agilex 7 FPGA F-series Development Kit (Alternative Monolithic) Power Tree

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.