MAX17681

Name: MAX17681
Brand: Analog Devices
Availability: InStock

PRODUCTION

4.5V to 42V Input, High-Efficiency, Iso-Buck DC-DC Converter

Reduces External Components and Cost for DC-DC Isolation

Data Sheet (Rev. 4) Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.34

Viewing:

Overview

Reduces External Components and Total Cost
- No OptoCoupler
- Synchronous Primary Operation
- All-Ceramic Capacitors, Compact Layout
Reduces Number of DC-DC Regulators to Stock
- Wide 4.5V to 42V Input
- 0.9V to 0.96 x V_IN Primary Output Voltage
- Delivers Up to 5W Output Power
Reduces Power Dissipation
- Peak Efficiency > 90%
- 0.9µA (typ) Shutdown Current
Operates Reliably in Adverse Industrial Environments
- Peak and Sink Current-Limit Protection
- ±1.7% Feedback Accuracy
- Programmable EN/UVLO Threshold
- Adjustable Soft-Start
- Overtemperature Protection
- -40°C to +125°C Operation
Short-Circuit Protection
- MAX17681A Supports Robust Secondary-Side Short-Circuit Protection
- MAX17681A Is Recommended for All New Designs

Part Models: 4
1ku List Price: Starting From $2.34

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
MAX17681AATB+	Thin Dual Flatpack No Leads	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX17681AATB+T	Thin Dual Flatpack No Leads	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX17681ATB+	Thin Dual Flatpack No Leads	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX17681ATB+T	Thin Dual Flatpack No Leads	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 20, 2026 - 2571D PIN/ERRATA
		pcn_2571d
MAX17681AATB+T	PRODUCTION
MAX17681ATB+	PRODUCTION
MAX17681ATB+T	PRODUCTION
Jan 12, 2017 - 1674 DESIGN,ELECTRICAL DA
		pcn_1674
MAX17681ATB+	PRODUCTION
MAX17681ATB+T	PRODUCTION

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

SIMPLIS Models 5

Evaluation Kits

Evaluation Kit for MAX17681 Isolated ±15V or ±12V Output Configuration

Buy Now View Details

Features and Benefits

17V to 32V Input Voltage Range
±15V, 100mA or ±12V, 50mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
90% Peak Efficiency
Overcurrent Protection
No Optocoupler
Delivers Up to 3W Output Power
Overtemperature Protection
Proven PCB layout

Product Details

The MAX17681 evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681 high-efficiency, iso-buck DC-DC converter. The EV kit operates over a wide input voltage range of 17V to 32V and uses primary-side feedback to regulate the output voltage. The EV kit has two output configurations. In the first configuration, the output is programmed to ±15V at 100mA, with ±10% output-voltage regulation. The second configuration uses a post regulator (MAX17651) to produce ±12V at 50mA with < ±3% regulation.

The EV kit comes installed with the MAX17681 in a 10-pin (3mm x 2mm) TDFN package and MAX17651 in a 6-pin TSOT package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Evaluation Kit MAX17681A for Isolated +24V Output Configuration

Buy Now View Details

Features and Benefits

17V to 36V Input Voltage Range
+24V, 100mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
Overcurrent Protection
No Optocoupler
Delivers up to 2.4W Output Power
Overtemperature Protection
Proven PCB Layout
Provides robust primary and secondary output short-circuit protection

Product Details

The MAX17681AEVKITF is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681A high-efficiency, iso-buck DC-DC Converter. The EV kit operates over a wide input-voltage range of 17V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit output is programmed to +24V at 100mA, with ±8% output voltage regulation.

The EV kit comes installed with the MAX17681A in a 10-pin (3mm x 2mm) TDFN package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Resources

MAX17681AEVKITF ODB File - Design Files
10/19/2023

Evaluation Kit MAX17681A for Isolated +15V or +12V Output Configuration

Buy Now View Details

Features and Benefits

17V to 36V Input Voltage Range
+15V, 200mA or +12V, 100mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
89.5% Peak Efficiency
Overcurrent Protection
No Optocoupler
Delivers up to 3W Output Power
Overtemperature Protection
Proven PCB layout
Provides robust primary and secondary output short-circuit protection

Product Details

The MAX17681AEVKITC is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681A high-efficiency, iso-buck DC-DC converter. The EV kit operates over a wide input-voltage range of 17V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit has two output configurations. In the first configuration, the output is programmed to +15V at 200mA, with ±8% output voltage regulation. The second configuration uses a post regulator (MAX17651) to produce +12V at 100mA with better than ±3% regulation.

The EV kit comes installed with the MAX17681A in a 10-pin (3mm x 2mm) TDFN package and MAX17651 in a 6-lead Thin-SOT (TSOT) package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Resources

MAX17681AEVKITC ODB File - Design Files
10/20/2023

Evaluation Kit MAX17681A for Isolated ±15V or ±12V Output Configuration

Buy Now View Details

Features and Benefits

17V to 32V Input Voltage Range
±15V, 100mA or ±12V, 50mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
90% Peak Efficiency
Overcurrent Protection
No Optocoupler
Delivers Up to 3W Output Power
Overtemperature Protection
Proven PCB layout
Provides Robust Primary and Secondary Output Short-Circuit Protection

Product Details

The MAX17681A evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681A high-efficiency, isobuck DC-DC converter. The EV kit operates over a wide input voltage range of 17V to 32V and uses primary-side feedback to regulate the output voltage. The EV kit has two output configurations. In the first configuration, the output is programmed to ±15V at 100mA, with ±10% output voltage regulation. The second configuration uses a post regulator (MAX17651) to produce ±12V at 50mA with less than ±3% regulation.

The EV kit comes installed with the MAX17681A in a 10-pin (3mm × 2mm) TDFN package and MAX17651 in a 6-pin TSOT package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Resources

MAX17681AEVKITA ODB File - Design Files
10/19/2023

Evaluation Kit for the MAX17681 Isolated +7V or +5V Output Configuration

Buy Now View Details

Features and Benefits

17V to 36V Input Voltage Range
+7V, 200mA or +5V, 100mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
Overcurrent Protection
No Optocoupler
Delivers up to 1.4W Output Power
Overtemperature Protection
Proven PCB Layout

Product Details

The MAX17681EVKITD is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681 high-efficiency, iso-buck DC-DC converter. The EV kit operates over a wide input-voltage range of 17V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit has two output configurations. In the first configuration, the output is programmed to +7V at 200mA, with ±8% output voltage regulation. The second configuration uses a post regulator (MAX17651) to produce +5V at 100mA with at least ±3% regulation.

The EV kit comes installed with the MAX17681 in a 10-pin (3mm x 2mm) TDFN package and MAX17651 in a 6-lead TSOT package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Evaluation Kit MAX17681A for Isolated ±15V and ±7.5V Output Configuration

Buy Now View Details

Features and Benefits

17V to 36V Input Voltage Range
±15V, 75mA Each and ±7.5V, 75mA Each Continuous Current
EN/UVLO Input
200kHz Switching Frequency
86.9% Peak Efficiency
Overcurrent Protection
No Optocoupler
Delivers Up to 3.4W Output Power
Overtemperature Protection
Proven PCB layout
Provides robust primary and secondary output short-circuit protection

Product Details

The MAX17681E evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681A high-efficiency, iso-buck, DC-DC converter. The EV kit operates over a wide input-voltage range of 17V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit output is programmed to ±15V, 75mA each and ±7.5V, 75mA each with ±10% regulation.

The EV kit comes installed with the MAX17681A in a 10-pin (3mm x 2mm) TDFN package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Evaluation Kit MAX17681A for Isolated ±7V or ±5V Output Configuration

Buy Now View Details

Features and Benefits

17V to 36V Input Voltage Range
±7V, 100mA or ±5V, 50mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
87.5% Peak Efficiency
Overcurrent Protection
No Optocoupler
Delivers up to 1.4W Output Power
Overtemperature Protection
Proven PCB Layout
Provides robust primary and secondary output short-circuit protection

Product Details

The MAX17681AEVKITB is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681A high-efficiency, iso-buck DC-DC converter. The EV kit operates over a wide input-voltage range of 17V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit has two output configurations. In configuration one the output is programmed to ±7V@100mA, with ±8% output voltage regulation. The second configuration uses a post regulator, MAX17651 to produce ±5V at 50mA with < ±3% regulation.

The EV kit comes installed with the MAX17681A in a 10-pin (3mm x 2mm) TDFN package and MAX17651 in a 6-lead TSOT package.

Resources

MAX17681AEVKITB ODB File - Design Files
10/19/2023

Evaluation Kit for the MAX17681 Isolated +24V Output Configuration

Buy Now View Details

Features and Benefits

17V to 36V Input Voltage Range
+24V, 100mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
Overcurrent Protection
No Optocoupler
Delivers up to 2.4W Output Power
Overtemperature Protection
Proven PCB Layout

Product Details

The MAX17681EVKITF is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681 high-efficiency, iso-buck DC-DC Converter. The EV kit operates over a wide input-voltage range of 17V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit output is programmed to +24V at 100mA, with ±8% output voltage regulation.

The EV kit comes installed with the MAX17681 in a 10-pin (3mm x 2mm) TDFN package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Evaluation Kit for the MAX17681 Isolated ±7V or ±5V Output Configuration

Buy Now View Details

Features and Benefits

17V to 36V Input Voltage Range
±7V, 100mA or ±5V, 50mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
87.5% Peak Efficiency
Overcurrent Protection
No Optocoupler
Delivers up to 1.4W Output Power
Overtemperature Protection
Proven PCB Layout

Product Details

The MAX17681EVKITB is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681 high-efficiency, iso-buck DC-DC converter. The EV kit operates over a wide input-voltage range of 17V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit has two output configurations. In configuration one the output is programmed to ±7V@100mA, with ±8% output voltage regulation. The second configuration uses a post regulator, MAX17651 to produce ±5V@50mA with < ±3% regulation.

The EV kit comes installed with the MAX17681 in a 10-pin (3mm x 2mm) TDFN package and MAX17651 in a 6-lead TSOT package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Evaluation Kit for MAX17681 Isolated ±15V and ±7.5V Output Configuration

Buy Now View Details

Features and Benefits

17V to 36V Input Voltage Range
±15V, 75mA Each and ±7.5V, 75mA Each Continuous Current
EN/UVLO Input
200kHz Switching Frequency
86.9% Peak Efficiency
Overcurrent Protection
No Optocoupler
Delivers Up to 3.4W Output Power
Overtemperature Protection
Proven PCB layout

Product Details

The MAX17681E evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681 high-efficiency, iso-buck, DC-DC converter. The EV kit operates over a wide inputvoltage range of 17V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit output is programmed to ±15V, 75mA each and ±7.5V, 75mA each with ±10% regulation.

The EV kit comes installed with the MAX17681 in a 10-pin (3mm x 2mm) TDFN package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Evaluation Kit MAX17681A for Isolated +7V or +5V Output Configuration

Buy Now View Details

Features and Benefits

17V to 36V Input Voltage Range
+7V, 200mA or +5V, 100mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
Overcurrent Protection
No Optocoupler
Delivers up to 1.4W Output Power
Overtemperature Protection
Proven PCB Layout
Provides robust primary and secondary output short-circuit protection

Product Details

The MAX17681AEVKITD is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681A high-efficiency, iso-buck DC-DC converter. The EV kit operates over a wide input-voltage range of 17V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit has two output configurations. In the first configuration, the output is programmed to +7V at 200mA, with ±8% output voltage regulation. The second configuration uses a post regulator (MAX17651) to produce +5V at 100mA with at least ±3% regulation.

The EV kit comes installed with the MAX17681A in a 10-pin (3mm x 2mm) TDFN package and MAX17651 in a 6-lead TSOT package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Resources

MAX17681AEVKITD ODB File - Design Files
10/20/2023

Evaluation Kit for the MAX17681 Isolated +15V or +12V Output Configuration

Buy Now View Details

Features and Benefits

17V to 36V Input Voltage Range
+15V, 200mA or +12V, 100mA Continuous Current
EN/UVLO Input
200kHz Switching Frequency
89.5% Peak Efficiency
Overcurrent Protection
No Optocoupler
Delivers up to 3W Output Power
Overtemperature Protection
Proven PCB layout

Product Details

The MAX17681EVKITC is a fully assembled and tested circuit board that demonstrates the performance of the MAX17681 high-efficiency, iso-buck DC-DC converter. The EV kit operates over a wide input-voltage range of 17V to 36V and uses primary-side feedback to regulate the output voltage. The EV kit has two output configurations. In the first configuration, the output is programmed to to +15V at 200mA, with ±8% output voltage regulation. The second configuration uses a post regulator (MAX17651) to produce +12V at 100mA with better than ±3% regulation.

The EV kit comes installed with the MAX17681 in a 10-pin (3mm x 2mm) TDFN package and MAX17651 in a 6-lead Thin-SOT (TSOT) package.

Applications

Floating Power Supply Generation
Isolated Fieldbus Interfaces
Isolated Power Supplies in Medical Equipment
PLC I/O Modules
Smart Meters

Reference Designs

24V/100mA, Iso-Buck DC-DC Converter Using the MAX17681A

View Detailed Reference Design

Features and Benefits

Reduces External Components and Total Cost

No Optocoupler
Synchronous Primary Operation
All-Ceramic Capacitors, Compact Layout

Reduces Number of DC-DC Regulators to Stock

Wide 4.5V to 42V Input
0.9V to 0.96 x VIN Primary Output Voltage
Delivers Up to 5W Output Power

Reduces Power Dissipation

Peak Efficiency > 90%
0.9μA (typ) Shutdown Current

Operates Reliably in Adverse Industrial Environments

Peak and Sink Current-Limit Protection
Robust Secondary-Side Output Overcurrent Protection (MAX17681A)
±1.7% Feedback Accuracy
Programmable EN/UVLO Threshold
Adjustable Soft-Start
Overtemperature Protection
-40°C to +125°C Operation

This reference design is derived from the MAX17681AEVKITF. The three main differences between MAXREFDES1170 and the MAX17681AEVKITF are as follows:

The board size of the MAXREFDES1170 is 20mm × 40mm, which is approximately one-quarter the size of the MAXREFDES17681AEVKITF.
The pin distances of the MAXREFDES1170 are consistent with Distributed-power Open Standards Alliance (DOSA) open standards for DC/DC brick power supplies.
The reference design has two transformer options, one is from Wurth and the other is from the transformer vendor HanRun.

With the above three features, customers can reduce the whole solution size and cost. Customers can also mount this reference design on system boards.