MAX17687

PRODUCTION

4.5V to 60V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter

Reduce External Components, Solution Size and Cost for DC-DC Isolation

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.12

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Overview

Eliminates External Components and Reduces Total Cost
- Synchronous Primary Operation for High Efficiency and Reduced Cost
- All-Ceramic Capacitors, Ultra-Compact Layout
Supports Numerous Isolated DC-DC Applications
- Wide 4.5V to 60V Input Voltage Range
- Delivers up to 3.2A Peak Current
- 100kHz to 500kHz Adjustable Frequency with External Synchronization
- Available in a 20-Pin, 4mm x 4mm TQFN Package
Reduces Power Dissipation
- Peak Efficiency > 90%
- Shutdown Current = 2.8μA (typ)
Operates Reliably in Adverse Industrial Environments
- Hiccup-Mode Current Limit, Sink Current Limit, and Auto-Retry Startup
- Programmable EN/UVLO Threshold
- Adjustable Soft-Start
- -40°C to +125°C Ambient Operating Temperature Range
- -40°C to +150°C Junction Temperature Range

The Rainier series of isolated DC-DC products enable small, efficient solutions with a lower BOM. The MAX17687 is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to provide isolated power up to 10W. The device operates over a wide 4.5V to 60V input voltage range and uses primary-side feedback to regulate the output voltage. It delivers primary peak current up to 3.2A and regulates primary output voltage to within ±1.2%.

The device features peak-current-mode control with pulse-width modulation (PWM) scheme. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.

A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input-voltage level. An open-drain active-low RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the primary output voltage.

The device operates from -40°C to +125°C and is available in a compact 20-pin (4mm x 4mm) TQFN package. Simulation models are available.

Applications

Communication Hub in Smart Meters
Floating Power Supply Generation
Industrial Process Control
Isolated Power Supplies in Medical Equipment

Part Models: 2
1ku List Price: Starting From $3.12

Documentation

Data Sheet 1

MAX17687: 4.5V to 60V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter Data Sheet (Rev.0) 05/20/2019

Technical Articles 1

How to Select a Transformer When Designing an Isolated Buck Converter 02/07/2022

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
MAX17687ATP+	Thin Quad Flatpack, No Leads	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX17687ATP+T	Thin Quad Flatpack, No Leads	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 6, 2025 - 2455N ASSEMBLY
		pcn_2455n
MAX17687ATP+	PRODUCTION
MAX17687ATP+T	PRODUCTION

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

Software Resources

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Tools & Simulations

EE-Sim Power® Tools 1

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.

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Evaluation Kits

Evaluation Kit for the MAX17687 for Isolated +12V Output Configuration

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Features and Benefits

16V to 60V Input Voltage Range
+12V, 750mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
Overcurrent Protection
No Optocoupler
Delivers up to 10W Output Power
Overtemperature Protection
Proven PCB layout
Complies with CISPR22(EN55022) Class B Conducted and Radiated Emissions

Product Details

The MAX17687EVKITA# evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the performance of the MAX17687 high-efficiency, iso-buck DC-DC Converter. The EV kit operates over a wide inputvoltage range of 16V to 60V and uses primary-side feedback to regulate the output voltage. The EV kit has isolated output, programmed to +12V at 750mA, with 10% output voltage regulation.

The EV kit comes installed with the MAX17687 in a 20-pin (4mm x 4mm) TQFN package.