LT8609
LT8609A
LT8609B

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. J) Product Selection Table
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Overview

  • 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, 5VOUT from 12VIN
  • 3A Maximum Continuous Output
  • Fast Minimum Switch-On Time: 45ns
  • LT8609A Available in Fixed 3.3V and 5V Output
  • Adjustable and Synchronizable: 200kHz to 2.2MHz
  • Spread Spectrum Frequency Modulation for Low EMI
  • Allows Use of Small Inductors
  • Low Dropout
  • Peak Current Mode Operation
  • Accurate 1V Enable Pin Threshold
  • Internal Compensation
  • Output Soft-Start and Tracking
  • Small 10-Lead MSOP Package, 16-Lead MSOP Package, or 10-Lead 3mm × 3mm DFN Package with Side Wettable Flanks
  • AEC-Q100 Qualified for Automotive Applications
LT8609
LT8609A
LT8609B
42V, 3A Synchronous Step-Down Regulator with 2.5µA Quiescent Current
LT8609/LT8609A/LT8609B Application Circuit LT8609/LT8609A Pin Configuration LT8609B Pin Configuration LT8609A Pin Configuration LT8609/LT8609A Pin Configuration LT8609/LT8609A/LT8609B Pin Configuration LT8609/LT8609A/LT8609B Performance Graph
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Documentation

Data Sheet 1

User Guide 2

Application Note 2

Design Note 2

Technical Articles 3

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 2
LTC4364
RECOMMENDED FOR NEW DESIGNS Surge Stopper with Ideal Diode
LTC4367
RECOMMENDED FOR NEW DESIGNS 100V Overvoltage, Undervoltage and Reverse Supply Protection Controller
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT8609
  • LT8609A
  • LT8609B
  • LT8609S

LTpowerCAD 2

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

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DC2195B

LT8609AEMSE Demo Board | µPower Sync Buck, Low EMI, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 2A, FSW = 2MHz

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Product Details

Demonstration circuit 2195B is a 42V, 2A micropower synchronous step-down regulator featuring the LT8609 or LT8609A. There are two assembly versions. DC2195B-A is for the LT8609A and DC2195B-B (and DC2195A) is for the LT8609. The difference is the LT8609A has slower edge speeds for improved EMI at the expense of a small efficiency loss.



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DC2958A

LT8609A/09A-5/09A-3.3 Demo Board | 42V, 3A Micropower Synchronous Step-Down Regulator

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Product Details

Demonstration circuit 2958A is a 42V, 3A micropower synchronous step-down regulator featuring the LT8609A/09A-5/09A-3.3. There are three assembly versions; DC2958A-A is for the LT8609A adjustable output, DC2958A-B is for the LT8609A-5 with a fixed 5V output voltage and DC2958A-C is for the LT8609A-3.3 with a fixed 3.3V output voltage.

The LT8609A/09A-5/09A-3.3 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current. Top and bottom power switches, compensation components and other necessary circuits are inside of the IC to minimize external components and simplify design.

The SYNC pin on the demo board is grounded by default for low ripple Burst Mode operation. Moving JP1 to PULSE SKIPPING position changes the operation mode to pulse-skipping operation. Once JP1 is placed on SPREAD SPECTRUM position, VCC is applied to the SYNC pin for low EMI spread spectrum operation. To synchronous to an external clock, move JP1 to SYNC and apply the external clock to the SYNC turret.

The demo board is designed for 5V or 3.3V output with up to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The minimum input voltage can be as low as 3V for drop out mode operation. Under this mode, the output voltage is below the regulation point and follow the input voltage. To maintain the output under regulation, input voltage should be above certain value. For DC2958A-A (adjustable) and DC2958A-B (5V), this value is 5.5V while 3.8V for DC2958A-C (3.3V). The rated maximum load current is 3A, while derating is necessary for certain input voltage and thermal conditions. Figure 1 shows the efficiency of the circuit. Figure 2 shows the IC top temperature rising on DC2958A demo board under different load conditions.

The demo board has an EMI filter installed. The radiated EMI performances of the board (with EMI filter) are shown in Figure 3 and Figure 4. The red lines in Figure 3 and Figure 4 are CISPR25 Class 5 peak limit. To use the EMI filter, the input should be tied to VEMI, not VIN. An inductor L2, which is shorted on the board by default, can be added in the EMI filter to further reduce the conducted emission.

The LT8609A/09A-5/09A-3.3 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this 
demo manual for DC2958A.


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SHARC Audio Module (ADZS-SC589-MINI)

The SHARC Audio Module (SAM) is an expandable hardware/software platform for audio applications.

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Features and Benefits

  • ADSP-SC589 Floating-Point SHARC® Processor
    • Dual 500 MHz SHARC+® DSP cores and a 500MHz ARM® Cortex®-A5 core
  • Two 2Gbit DDR3 memories
  • 512Mbit SPI flash memory
  • 24-bit, 96kHz ADAU1761 SigmaDSP® Audio Codec
  • AD2428W A2B® Transceiver
    • Multi-channel low-latency audio interface
  • 1/8“ stereo jacks
  • Two 60-pin connectors, supporting ADI and 3rd Party “Fins” (Expansion Boards)
  • Includes a free CrossCore® Embedded Studio license and an ICE-1000 emulator for debugging
Additional Peripherals:

  • UART (for MIDI & more)
  • S/PDIF
  • Gigabit Ethernet
  • USB OTG & HS

Product Details

The SHARC® Audio Module is an expandable hardware/software platform that enables project prototyping, development and deployment of audio applications including effects processors, multi-channel audio systems, MIDI synthesizers, and many other DSP-based audio projects.

The centerpiece of the SHARC Audio Module is the  Analog Devices ADSP-SC589 SHARC processor, a remarkable engine for  audio processing which incorporates dual SHARC+ DSP cores and an ARM  core. Accompanying the SHARC is an expert selected group of peripherals ideally suited for audio project development.

While the SHARC Audio Module can be used as a self-contained product, it is designed for custom expansion. Analog Devices is developing expansion boards (called “Fins”). The first in this series is an Audio Project Fin that plugs directly onto the main SHARC Audio Module.

In addition, there are several leading developers and board designers that provide a variety of software and hardware platforms for you to expand the SHARC Audio Module platform. Since all of the major functions and GPIO of the board can be accessed via the two multi-pin connectors, you can easily design and build your own expander. Documentation for these connectors can be found in the SHARC Audio Module Hardware Reference Manual.

This board is designed to be used in conjunction with the CrossCore® Embedded Studio (CCES) development tools. The development environment aids advanced application code development and debug.

In addition to traditional C and C++ development, the SHARC Audio Module supports Faust (Functional Audio Stream), an open-source, functional programming language, specifically designed for real-time audio signal processing and synthesis. Faust generates C++, as well as other target languages, for signal processing applications. The Faust library provides a rich set of audio DSP objects that can be used in creating DSP algorithms. Using Faust, it is possible to quickly create large algorithms that take advantage of the computing power available on the SHARC Audio Module platform.

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SCP-LT8609S-IEVALZ

LT8609S Signal Chain Evaluation Board | Inverting Buck Converter

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Product Details

Demonstration circuit SCP-LT8609S-IEVALZ 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.

Like all boards in the Signal Chain Power series, this board is designed to be easily plugged into other SCP boards to form a complete signal chain power system, enabling fast evaluation of low power signal chains. To evaluate this board, some universal SCP hardware is required, namely:

  • SCP-INPUT-EVALZ
  • SCP-OUTPUT-EVALZ
  • SCP-FILTER-EVALZ
  • SCP-THRUBRD-EVALZ
  • SCP-1X2BKOUT-EVALZ
  • SCP-1X5BKOUT-EVALZ
  • SCP-5X1-EVALZ

 

To properly evaluate SCP series demo boards, you will need the SCP Configurator companion software. SCP Configurator can help you choose the right board and topology for your design.

Note that the Demo Manual does not cover details important to the operation and configuration regarding the LT8609S. Please refer to the LT8609S datasheet for a complete description of the part.

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SCP-LT8609S-BEVALZ

LT8609S Signal Chain Evaluation Board | Synchronous Buck Converter

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Product Details

Demonstration circuit SCP-LT8609S-BEVALZ is a 42V, 2A/3A peak micropower synchronous step-down regula-tor featuring the LT8609S. The demo board is configured for a 5V output from a 5.5V to 42V input.

Like all boards in the Signal Chain Power series, this board is designed to be easily plugged into other SCP boards to form a complete signal chain power system, enabling fast evaluation of low power signal chains. To evaluate this board, some universal SCP hardware is required, namely:

  • SCP-INPUT-EVALZ
  • SCP-OUTPUT-EVALZ
  • SCP-FILTER-EVALZ
  • SCP-THRUBRD-EVALZ
  • SCP-1X2BKOUT-EVALZ
  • SCP-1X5BKOUT-EVALZ
  • SCP-5X1-EVALZ

 

To properly evaluate SCP series demo boards, you will need the SCP Configurator companion software. SCP Configurator can help you choose the right board and topology for your design.

Note that the Demo Manual does not cover details important to the operation and configuration regarding the LT8609S. Please refer to the LT8609S datasheet for a complete description of the part.
DC2195B
LT8609AEMSE Demo Board | µPower Sync Buck, Low EMI, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 2A, FSW = 2MHz
DC2195B-A Demo Board DC2195B-A Demo Board DC2195B-A Demo Board DC2195B-A Demo Board DC2195B - Schematic
DC2958A
LT8609A/09A-5/09A-3.3 Demo Board | 42V, 3A Micropower Synchronous Step-Down Regulator
Proper Measurement Equipment Setup
SHARC Audio Module (ADZS-SC589-MINI)
The SHARC Audio Module (SAM) is an expandable hardware/software platform for audio applications.
ADZS-SC589MINI - Angle View ADZS-SC589MINI - Top View ADZS-SC589MINI - Bottom View SHARC Audio Module (ADZS-SC589-MINI)
SCP-LT8609S-IEVALZ
LT8609S Signal Chain Evaluation Board | Inverting Buck Converter
LT8609S Signal Chain Evaluation Board LT8609S Signal Chain Evaluation Board - Top View LT8609S Signal Chain Evaluation Board - Bottom View
SCP-LT8609S-BEVALZ
LT8609S Signal Chain Evaluation Board | Synchronous Buck Converter
LT8609S Signal Chain Evaluation Board LT8609S Signal Chain Evaluation Board - Top View LT8609S Signal Chain Evaluation Board - Bottom View

Reference Designs

i.MX7 96Board
i.MX7 96Board
i.MX7 96Board Power Tree
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View Detailed Reference Design

Features and Benefits

  • 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
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
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CN0508 Block Diagram
EVAL-CN0508-RPIZ Evaluation Board
EVAL-CN0508-RPIZ Evaluation Board - Top View
EVAL-CN0508-RPIZ Evaluation Board - Bottom View
CN0508 Circuits from the lab

75 Watt, Single-Output Benchtop Power Supply

View Detailed Reference Design

Features and Benefits

  • 75 Watt Power Supply
  • Constant Current (>3A) and Constant Voltage (>25V) Modes
  • True 0V and 0A operation
  • Manual or Software Controlled
NXP (Freescale) i.MX7 96Board
i.MX7 96Board
i.MX7 96Board Power Tree
CN0508
75 Watt, Single-Output Benchtop Power Supply
CN0508 Block Diagram
EVAL-CN0508-RPIZ Evaluation Board
EVAL-CN0508-RPIZ Evaluation Board - Top View
EVAL-CN0508-RPIZ Evaluation Board - Bottom View

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