LT8685S

Name: LT8685S
Brand: Analog Devices
Price: 6.36 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

42V Quad, Gangable, Synchronous, Monolithic Step-Down Regulator

Data Sheet (Rev. A) Product Selection Table

Part Models: 4
1ku List Price: Starting From $6.36

Viewing:

Overview

Silent Switcher®2 Architecture
- Ultralow EMI Emissions
- Optional Spread Spectrum Modulation
Two High Voltage Synchronous Buck Regulators
- 3V to 42V Input Voltage Range
- Output Currents Up to 2.5A per Channel
- Channels May Be Connected in Parallel Using a Single Inductor

Two Low Voltage Synchronous Buck Regulators
- 3V to 8V Input Voltage Range
- Output Currents Up to 4A per Channel
- Channels May Be Connected in Parallel Using a Single Inductor
12μA IQ All Channels Active and No-Load
Flexible Supply Sequencing and Control
Adjustable and Synchronizable: 350kHz to 3MHz
Available in 36-Lead LQFN (5mm × 6mm)

Part Models: 4
1ku List Price: Starting From $6.36

Documentation

Data Sheet 1

LT8685S: 42V Quad, Gangable, Synchronous, Monolithic Step-Down Regulator Data Sheet (Rev.A) 06/15/2022

User Guide 1

EVAL-LT8685S-AZ - Demo Manual (Rev.0) 10/25/2022

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
LT8685SRV#PBF	36-Lead LQFN Package (5mm x 6mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8685SRV#TRPBF	36-Lead LQFN Package (5mm x 6mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8685SRV#WPBF	36-Lead LQFN Package (5mm x 6mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8685SRV#WTRPBF	36-Lead LQFN Package (5mm x 6mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

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

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT8685S

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT8685SHV
LT8685SLV

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

LT8685S | 42V Quad, Gangable, Synchronous, Monolithic Step-Down Regulator

Buy Now View Details

Product Details

Demonstration circuit EVAL-LT8685S-AZ is a 4-rail power supply featuring the LT8685S, a 42V quad monolithic synchronous step-down silent switcher. The demo circuit is designed for 5V, 3.3V, 1.8V, and 1.2V outputs from a nominal 12V input. The 5V and 3.3V rails are powered from the 12V input, while the 1.8V and 1.2V rails are powered from one of the high voltage buck regulators of 5V or 3.3V. The current capability is 2.5A for the channels 1 and 2. The current ratings for the low voltage channels are 4A.

The two 42V regulators may be combined to provide up to 5A of output current using a single inductor. Similarly, the two 8V regulators may be combined to provide up to 8A of output current using a single inductor.

Individual track/soft-start, current limit, independent enable and power good for each channel simplify the complex design of quad-output power converters. All regulators can be synchronized to a common external clock input or internal oscillator that can be programmed with a single resistor for switching frequency from 350kHz to 3MHz, allowing for optimal system design per specific applications.

The Performance Summary table in the demo manual summarizes the performance of the demo board at room temperature. The circuit can be easily modified for different applications.

The LT8685S data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with the quick start guide for demo circuit EVAL-LT8685S-AZ.