LT8609S

RECOMMENDED FOR NEW DESIGNS

42V, 2A/3A Peak Synchronous Step-Down Regulator with 2.5μA Quiescent Current

Data Sheet (Rev. D) Product Selection Table
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Overview

  • Silent Switcher® 2 Architecture
    • Ultralow EMI Emissions on Any PCB
    • Eliminates PCB Layout Sensitivity
    • Internal Bypass Capacitors Reduce Radiated EMI
    • Optional Spread Spectrum Modulation
  • Wide Input Voltage Range: 3.0V to 42V
  • Ultralow Quiescent Current Burst Mode® Operation:
    • <2.5µA IQ Regulating 12VIN to 3.3VOUT
    • Output Ripple <10mVP-P
  • High Efficiency 2MHz Synchronous Operation:
    • >93% Efficiency at 1A, 12VIN to 5VOUT
  • 2A Maximum Continuous Output, 3A Peak Transient Output
  • Fast Minimum Switch-On Time: 45ns
  • Adjustable and Synchronizable: 200kHz to 2.2MHz
  • Allows Use of Small Inductors
  • Low Dropout
  • Peak Current Mode Operation
  • Internal Compensation
  • Output Soft-Start and Tracking
  • Small 16-Lead 3mm × 3mm LQFN Package
  • AEC-Q100 Qualified for Automotive Applications
LT8609S
42V, 2A/3A Peak Synchronous Step-Down Regulator with 2.5μA Quiescent Current
LT8609S Application Circuit LT8609S Performance Graph LT8609S Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

Design Note 2

Technical Articles 3

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Hot Swap Controllers 2
LTC4380
RECOMMENDED FOR NEW DESIGNS Low Quiescent Current Surge Stopper
LTC4231
RECOMMENDED FOR NEW DESIGNS Micropower Hot Swap Controller
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT8609
  • LT8609A
  • LT8609B
  • LT8609S

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LT8609
  • LT8609A
  • LT8609S
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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
DC2522A

LT8609S Demo Board | Silent Switcher 2 Buck, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 2A, fSW = 2MH

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Product Details

Demonstration circuit 2522A is a 42V, 2A/3A peak micropower synchronous step-down regulator featuring the LT8609S. The demo board is designed for 5V output from a 5.5V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8609S is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current when output is regulated at 5V. Top and bottom power switches, compensation components and other necessary circuits are inside of the LT8609S to minimize external components and simplify design.

eval board
schematic 5
schematic 6
schematic 7
schematic 8
DC2522A

LT8609S Demo Board | Silent Switcher 2 Buck, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 2A, fSW = 2MH

Buy Now View Details

Product Details

Demonstration circuit 2522A is a 42V, 2A/3A peak micropower synchronous step-down regulator featuring the LT8609S. The demo board is designed for 5V output from a 5.5V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8609S is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current when output is regulated at 5V. Top and bottom power switches, compensation components and other necessary circuits are inside of the LT8609S to minimize external components and simplify design.
DC2522A
LT8609S Demo Board | Silent Switcher 2 Buck, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 2A, fSW = 2MH
DC2522A Evaluation Board DC2522A Evaluation Board - Top View DC2522A Evaluation Board - Bottom View DC2522A - Demo Board Image
DC2522A
LT8609S Demo Board | Silent Switcher 2 Buck, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 2A, fSW = 2MH
DC2522A Evaluation Board DC2522A Evaluation Board - Top View DC2522A Evaluation Board - Bottom View DC2522A - Demo Board Image

Reference Designs

Figure 1. CN0566 Simplified Block Diagram
Figure 1. CN0566 Simplified Block Diagram
EVAL-CN0566-RPIZ Phased Array Development Kit
EVAL-CN0566-RPIZ Phased Array Development Kit
EVAL-CN0566-RPIZ KIT - Angle View
EVAL-CN0566-RPIZ KIT - Angle View
CN0566 Circuits from the lab

Phased Array (Phaser) Development Platform

View Detailed Reference Design

Features and Benefits

  • 10 GHz to 10.5 GHZ Beamsteering Platform
  • 360 degree Phase Shift w/ 2.8 Degree Resolution
  • 31 dB Amplitude Tuning Range w/ 0.5 dB Resolution.
  • 8-Element Linear Array Antenna
  • Digitized with PlutoSDR
  • Runs directly on a Raspberry Pi
Blaize<sup>&reg;</sup> Pathfinder P1600 Embedded System on Module
Blaize<sup>&reg;</sup> Pathfinder P1600 Embedded System on Module
Blaize<sup>&reg;</sup> Pathfinder P1600 SOM Power Tree
Blaize Pathfinder Circuits from the lab

Pathfinder P1600 SOM Module

View Detailed Reference Design

Features and Benefits

Blaize® Pathfinder P1600 small form factor embedded SoM brings the programmability and efficiency benefits of the Blaize GSP® architecture, ideal for AI inferencing workloads at the edge, to embedded systems.

Analog Devices, Inc. supports end to end power delivery solutions for Blaize Pathfinder P1600 SOM. Blaize uses Analog Devices discrete power solutions to enable their System on Chip (SoC) to deliver high compute with optimized with most TOPS/Watt performance for datacenter and Artificial Intelligence.

ADI provides supporting documentation including power schematics, layout, LTpowerPlanner® and applicable LTpowerPlay® configuration files to enable you to validate the power solution for your application seamlessly.

For a complete list power designs and use cases, please contact your local FAE.

Key Power for full management devices are used as follows:

  • LTC7151S
  • LT8609S
  • LTC3636
  • ADP1752
  • ADP1755
CN0566
Phased Array (Phaser) Development Platform
Figure 1. CN0566 Simplified Block Diagram
EVAL-CN0566-RPIZ Phased Array Development Kit
EVAL-CN0566-RPIZ Phased Array Development Kit
EVAL-CN0566-RPIZ KIT - Angle View
EVAL-CN0566-RPIZ KIT - Angle View
Blaize Pathfinder
Pathfinder P1600 SOM Module
Blaize<sup>&reg;</sup> Pathfinder P1600 Embedded System on Module
Blaize<sup>&reg;</sup> Pathfinder P1600 SOM Power Tree

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