LT8652S

Dual Channel 8.5A, 18V, Synchronous Step-Down Silent Switcher with 16µA Quiescent Current

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Recommended for New Designs

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Overview

Features and Benefits
Product Details

Features and Benefits

Silent Switcher^®2 Architecture:
- Ultralow EMI on Any PCB
- Eliminates PCB Layout Sensitivity
- Internal Bypass Capacitors Reduce Radiated EMI
- Spread Spectrum Frequency Modulation
8.5A DC from Each Channel Simultaneously
Up to 12A on Either Channel
Ultralow Quiescent Current Burst Mode^® Operation:
- 16µA IQ Regulating 12V_IN to 3.3V_OUT (Both Channels)
- Output Ripple <10mV_P-P
±1.2% 600mV Feedback Voltage with Remote Sense

Output Current Monitor Pins with Current Limiting
Forced Continuous Mode
CLKOUT for Up to 4-Phase Operation
93.6% Efficiency at 6A, 3.3V_OUT from 12V_IN at 1MHz
85.6% Efficiency at 6A, 1.0V_OUT from 12V_IN at 1MHz
Fast Minimum Switch-On Time: 20ns
Adjustable and Synchronizable: 300kHz to 3MHz
Small 4mm × 7mm 36-Pin LQFN Package
AEC-Q100 Qualification for Automotive Applications

Product Details

The LT8652S is a dual step-down regulator that delivers up to 8.5A of continuous current from both channels and supports loads up to 12A from each channel. The LT8652S uses second generation Silent Switcher technology including integrated bypass capacitors to deliver a high frequency, high efficiency, small solution with excellent EMI performance. The LT8652S is ideal for noise sensitive applications such as PLLs and high bandwidth data and communications systems.

The fast, clean, low overshoot switching edges enable high efficiency operation even at high switching frequencies, enabling a wide control loop bandwidth for fast transient response. Output current monitoring and limiting allows inductors to be selected for the maximum output current in a given application. Differential output voltage sensing provides accurate voltage regulation at the point of load for high current applications. The two channels can be combined to deliver 17A, and two LT8652S ICs can be combined for a 4-phase, 34A supply.

Applications

Server Power Applications
General Purpose Step-Down

Product Categories

Power Management

Markets and Technologies

Consumer (1)
- Personal Electronic Solutions

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Product Lifecycle Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

DC2523A

LT8652S Demo Board | Dual Channel 8.5A, 18V, Synchronous Step-Down Silent Switcher with 16µA Quiescent Current

DC2523A

View Detailed Evaluation Kit Information

Demonstration circuit 2523A is an 18V, 8.5A (continuous)/12A (peak) synchronous step-down Silent Switcher^® with 16µA quiescent current featuring the LT8652S. The LT8652S is a compact, high efficiency, high speed synchronous monolithic step-down switching with the second generation Silent Switcher structure that minimizes EMI and reduces PCB layout sensitivity. Top and bottom power switches, compensation components and other necessary circuits are inside of the LT8652S to minimize external components and simplify design. The demo board has two outputs: 3.3V and 1.2V from a 3.6V to 18V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies.

The SYNC pin on the demo board is grounded by default for low ripple Burst Mode^® operation. Move JP2 to FCM without SSM position can change the operation mode to forced continuous mode operation. Once JP2 is on FCM with SSM position, VCC is applied to the SYNC pin for low EMI spread spectrum operation. To synchronous to an external clock, move JP2 to SYNC and apply the external clock to the SYNC turret.

The demonstration circuit 2523A runs at 2MHz to minimize solution size. The peak efficiency is 90%. The IC temperature rise is less than 70°C when both channels run at full load, 8.5A each, at 2MHz.

The demo board has EMI filters installed for both channels. To use the EMI filter, the input should be tied to VEMI1/VEMI2, not VIN1/VIN2.

The LT8652S 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 DC2523A.

Resources

Documentation & Resources

Data Sheets

LT8652S: Dual Channel 8.5A, 18V, Synchronous Step-Down Silent Switcher with 16µA Quiescent Current Data Sheet (Rev. B)
10/22/2020

PDF

2 M

Reliability Data

R570 Reliability Data
3/23/2018

PDF

415 K

User Guides

DC2523A - Demo Manual
2/11/2020

PDF

488K

Videos

双通道8.5A、18V、同步降压Silent Switcher
3/3/2022
Dual Channel 8.5A, 18V, Synchronous Step-Down Silent Switcher
3/3/2022

Design Notes

Dual-Channel, 8.5 A, 18 V, Synchronous Step-Down Silent Switcher Device with 16 µA Quiescent Current
3/1/2020

Technical Articles

Ultralow Noise, High Current, Compact DC-to-DC Converter Solution for Signal and Data Processing Circuits
8/1/2020

Tools & Simulations

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.

LTspice downloads and documentation

Models for the following parts are available in LTspice:

LT8652S

LT8652SP

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.

To open the project file for this circuit:

Step 1: Download and install LTpowerCAD on your computer.

Step 2: Click on the link(s) in the section below to download part-specific project files.

Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.

LTpowerCAD download and documentation

LTpowerCAD Project Files

LT8652S Project - 5V-18Vin to 3.3Vout, 17A @ 2MHz

LT8652S Project - 4-18Vin to 3.3Vout1/8A, 1.2Vout2/8A, 2MHz

Design tools for the following parts are available in LTpowerCAD:

LT8652S

Reference Designs (1)

ZCU104

Zynq UltraScale+ MPSoC ZCU104 Paper Reference Design

ZCU104

Zynq UltraScale+ MPSoC ZCU104 Paper Reference Design

ZCU104

Zynq UltraScale+ MPSoC ZCU104 Paper Reference Design

View Detailed Reference Design Information

Features & Benefits

The ZCU104 Evaluation Kit enables designers to jumpstart designs for embedded vision applications such as surveillance, Advanced Driver Assisted Systems (ADAS), machine vision, Augmented Reality (AR), drones and medical imaging.

The ADI Power delivery solutions support multiple reference designs using DC/DC module and monolithic solutions. ADI offers several options for powering the Zu7 FPGA.

Our module-based solutions combine a small footprint, while maximizing efficiency and tight regulation. Our monolithic based solutions support a lower cost optimized power delivery solution for mass production.

ADI provides supporting documentation 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.

Please refer to the circuit descriptions below that best support your design.

Parts Used

Design Resources

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 Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
LT8652SEV#PBF	Material Declaration	Reliability Data	36-Lead LQFN (4mm × 7mm × 0.94mm)	Ultra Librarian SamacSys
LT8652SEV#TRPBF	Material Declaration	Reliability Data	36-Lead LQFN (4mm × 7mm × 0.94mm)	Ultra Librarian SamacSys
LT8652SEV#WPBF	Material Declaration	Reliability Data	36-Lead LQFN (4mm × 7mm × 0.94mm)	Ultra Librarian SamacSys
LT8652SEV#WTRPBF	Material Declaration	Reliability Data	36-Lead LQFN (4mm × 7mm × 0.94mm)	Ultra Librarian SamacSys
LT8652SIV#PBF	Material Declaration	Reliability Data	36-Lead LQFN (4mm × 7mm × 0.94mm)	Ultra Librarian SamacSys
LT8652SIV#TRPBF	Material Declaration	Reliability Data	36-Lead LQFN (4mm × 7mm × 0.94mm)	Ultra Librarian SamacSys
LT8652SIV#WPBF	Material Declaration	Reliability Data	36-Lead LQFN (4mm × 7mm × 0.94mm)	Ultra Librarian SamacSys
LT8652SIV#WTRPBF	Material Declaration	Reliability Data	36-Lead LQFN (4mm × 7mm × 0.94mm)	Ultra Librarian SamacSys
Wafer Fabrication Data		R570 Reliability Data

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.