LT8697

RECOMMENDED FOR NEW DESIGNS

USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation

Part Models: 6
1ku List Price: Starting From $4.25

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Overview

Wide Input Range: 5V to 42V
Low Dropout Under All Conditions: 450mV at 2.1A
Accurate 5V Output: ±1.3% Over Full Temperature Range
Programmable Cable Drop Compensation
Programmable Output Current Limit
Output Current Monitor
Dual Input Feedback Permits Regulation on Output of USB Switch
Forced Continuous Mode for Fast Load Step Response
High Efficiency Synchronous Operation at 2MHz:
- 93% Efficiency at 2.1A, 5V_OUT from 12V_IN
- 95% Efficiency at 0.9A, 5V_OUT from 12V_IN
Fast Minimum Switch-On Time: 45ns
Adjustable Output from 5.0V to 5.25V
Adjustable and Synchronizable: 300kHz to 2.2MHz
Small Thermally Enhanced 3mm × 5mm 24-Lead QFN Package

The LT8697 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator designed to power 5V USB applications. A precise output voltage and programmable cable drop compensation maintain accurate 5V regulation at the USB socket connected to the end of a long cable. Forced continuous operation allows the LT8697 to sink current, further enhancing accurate 5V regulation during load transients.

Accurate and programmable output current limit, a power good indicator pin and an output current monitor pin improve system reliability and safety, allow the user to implement latch-off or auto-retry functionality and can eliminate the need for a USB switch IC. Dual feedback allows regulation on the output of a USB switch and limits cable drop compensation to a maximum of 5.8V output, protecting USB devices during fault conditions. Thermal shutdown provides additional protection by limiting power dissipation in the IC during an overtemperature fault.

The LT8697 is available in a small 24-lead 3mm × 5mm package with an exposed pad for low thermal resistance.

Applications

Automotive and Industrial USB
Precision 5V Supply

Part Models: 6
1ku List Price: Starting From $4.25

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
LT8697EUDD#PBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8697EUDD#TRPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8697HUDD#PBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8697HUDD#TRPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8697IUDD#PBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8697IUDD#TRPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LT8697EUDD#PBF	PRODUCTION
LT8697EUDD#TRPBF	PRODUCTION
LT8697HUDD#PBF	PRODUCTION
LT8697HUDD#TRPBF	PRODUCTION
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Delta Qualification Matrix Qualification Results Summary Detailed Parts List Other
LT8697EUDD#PBF	PRODUCTION
LT8697EUDD#TRPBF	PRODUCTION
LT8697HUDD#PBF	PRODUCTION
LT8697HUDD#TRPBF	PRODUCTION
LT8697IUDD#PBF	PRODUCTION
LT8697IUDD#TRPBF	PRODUCTION
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LT8697IUDD#PBF	PRODUCTION
LT8697IUDD#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 1
LTC4361-1 LTC4361-2		Overvoltage/Overcurrent Protection Controller

Tools & Simulations

LTspice 1

LT8697 Demo Circuit - 2MHz 5V Step-Down Converter with Cable Drop Compensation (6-42V to 5V @ 2.1A)

Models for the following parts are available in LTspice:

LT8697

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

LT8697 Demo Board | 6V ≤ VIN ≤ 42V, 5V @ 2.5A USB Supply Output, Cable Drop Compensation

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Product Details

Demonstration circuit 1973A is a USB 5V 2.5A output, 6V to 42V input synchronous buck with cable drop compensation featuring the LT8697. The LT8697 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator designed to power 5V USB applications. A precise output voltage and programmable cable drop compensation maintain accurate 5V regulation at the USB socket at the end of a long cable. The circuit runs at 2MHz to minimize external components size and to avoid AM band.

Resources

DC1973A - Design Files
9/10/2013

DC1973A - Demo Manual
8/14/2013

DC1973A - Schematic
9/10/2013

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