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MAX17645

INTERACTIVE Data Sheet Buy Now Download

4.5V to 36V, 1A, High-Efficiency, Synchronous Step-Down DC-DC Converter

High-Efficiency, High-Voltage, Synchronous Step-Down DC-DC Converter with Integrated MOSFETs

INTERACTIVE Data Sheet

Product Details

Overview

Key Applications

Factory Automation

Within the many different applications in the Factory Automation space, one key need is the ability to generate less heat. Heat within the system needs to be managed to prevent overheating and shutdown. The MAX17645 dissipates less heat as it is a fully synchronous integrated FET DC-DC converter with high efficiency.

Aftermarket Market Automotive

Asset tracking application is an example within the aftermarket automotive space where the MAX17645 would provide a benefit. Asset tracking has increased in popularity, as the ability to wirelessly connect to the monitors has become easier. Typically, these units are designed to be as small as possible. The MAX17645 has integrated FETS and integrated compensation, all delivered in a small solution size. Small size and fewer components help to reduce overall design costs for the system.

General Point of Load

General point of load is a generic term that applies to a switching regulator that serves many applications and design environments. Critical to any environment is the robustness of the power conversion. With an operating range of -40°C to +125°C, current limit protection, overtemperature protection, and the ability to adhere to the CISPR32 class B emission standards, the MAX17645 delivers a small, high efficient power conversion in the most adverse environments and provides the designer the peace of mind that it is robust and reliable.

Ordering Information appears at end of data sheet.

Simplified Application Diagram

Product Highlights

Reduces External Components and Total Cost
- No Schottky—Synchronous Operation
- Internal Control Loop Compensation
- Internal Soft-Start
- All ceramic Capacitors, Ultra-Compact Layout
Reduces Number of DC-DC Regulators to Stock
- Wide 4.5V to 36V Input Voltage Range
- Adjustable Output from 0.9V up to 89% of V_IN
- Delivers Up to 1A Load Current
High Efficiency
- 90% Full-Load Efficiency (V_IN = 24V, V_OUT = 5V, I_OUT = 1A)
- 2.2µA (typ) Shutdown Current
- High Light-Load Efficiency with PFM Mode (MAX17645D)
Flexible Design
- Programmable EN/UVLO Threshold
- Monotonic Startup into Prebiased Output
- Open-Drain Output (RESET) for Output Status Monitoring
Robust Operation
- Built-in Hiccup Mode Overload Protection
- Overtemperature Protection
- CISPR32 Class B Compliant
- Wide -40°C to +125°C Ambient Operating Temperature/-40°C to +150°C Junction Temperature

Pin Description

19-101430; Rev 1; 3/22

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet

4.5V to 36V, 1A, High-Efficiency, Synchronous Step-Down DC-DC Converter

Jun 24, 2022

Design & Development

Click any title below to view the detail page where available.

Hardware Development

Evaluation Board

MAX17645BEVKITB

Data Sheet

Description/Applications

The MAX17645BEVKITB# and MAX17645DEVKITB# evaluation kits (EV kits) provide proven 5V designs to evaluate the performance of MAX17645B and MAX17645D high-efficiency, high-voltage, synchronous step-down DC-DC converters. The MAX17645BEVKITB# EV kit operates in constant frequency PWM (pulse-width modulation) mode at all loads and the MAX17645DEVKITB# EV kit operates in PFM (pulse-frequency modulation) mode at light loads to improve efficiency.

The EV kits are configured to demonstrate the optimum performance and component sizes for MAX17645B/ MAX17645D converter. The EV kits support a wide operating input range of 7V to 36V and are configured for 5V output. The EV kits deliver up to 1A at a switching frequency of 650kHz.

The features of the EV kits include adjustable input undervoltage lockout, fixed internal soft-start, and open-drain active-low RESET signal for output voltage status monitoring. The EV kits also provide a good layout example, which is optimized for conducted, radiated EMI, and thermal performance. For more details about the IC benefits and features, refer to the MAX17645 IC data sheet.

View Details

Features

Wide 7V to 36V Input Range
Up to 1A Load Current
650kHz Fixed Switching Frequency
High Peak Efficiency of 91.1% (V_IN = 24V, V_OUT = 5V,I_OUT = 0.6A)
EN/UVLO for On/Off Control and Programmable Input Undervoltage Lockout
Fixed 3.15ms (typ) Soft-Start Time
Open-Drain Active-Low RESET Output
Overcurrent and Overtemperature Protection
Proven PCB Layout
Fully Assembled and Tested
Complies with CISPR32 (EN55032) Class B Conducted and Radiated Emissions

Evaluation Board

MAX17645DEVKITB

Data Sheet

$31.81

Description/Applications

View Details

Features

Wide 7V to 36V Input Range
Up to 1A Load Current
650kHz Fixed Switching Frequency
High Peak Efficiency of 91.1% (V_IN = 24V, V_OUT = 5V,I_OUT = 0.6A)
EN/UVLO for On/Off Control and Programmable Input Undervoltage Lockout
Fixed 3.15ms (typ) Soft-Start Time
Open-Drain Active-Low RESET Output
Overcurrent and Overtemperature Protection
Proven PCB Layout
Fully Assembled and Tested
Complies with CISPR32 (EN55032) Class B Conducted and Radiated Emissions

Evaluation Board

MAX17645BEVKITB

Data Sheet

Description/Applications

View Details

Features

Wide 7V to 36V Input Range
Up to 1A Load Current
650kHz Fixed Switching Frequency
High Peak Efficiency of 91.1% (V_IN = 24V, V_OUT = 5V,I_OUT = 0.6A)
EN/UVLO for On/Off Control and Programmable Input Undervoltage Lockout
Fixed 3.15ms (typ) Soft-Start Time
Open-Drain Active-Low RESET Output
Overcurrent and Overtemperature Protection
Proven PCB Layout
Fully Assembled and Tested
Complies with CISPR32 (EN55032) Class B Conducted and Radiated Emissions

Evaluation Board

MAX17645DEVKITB

Data Sheet

$31.81

Description/Applications

View Details

Features

Wide 7V to 36V Input Range
Up to 1A Load Current
650kHz Fixed Switching Frequency
High Peak Efficiency of 91.1% (V_IN = 24V, V_OUT = 5V,I_OUT = 0.6A)
EN/UVLO for On/Off Control and Programmable Input Undervoltage Lockout
Fixed 3.15ms (typ) Soft-Start Time
Open-Drain Active-Low RESET Output
Overcurrent and Overtemperature Protection
Proven PCB Layout
Fully Assembled and Tested
Complies with CISPR32 (EN55032) Class B Conducted and Radiated Emissions

Tools & Models

EE-Sim: Design & Simulate MAX17645

Create Design

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

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Overview

Key Applications

Factory Automation

Aftermarket Market Automotive

General Point of Load

Ordering Information appears at end of data sheet.

Simplified Application Diagram

Product Highlights

Reduces External Components and Total Cost
- No Schottky—Synchronous Operation
- Internal Control Loop Compensation
- Internal Soft-Start
- All ceramic Capacitors, Ultra-Compact Layout
Reduces Number of DC-DC Regulators to Stock
- Wide 4.5V to 36V Input Voltage Range
- Adjustable Output from 0.9V up to 89% of V_IN
- Delivers Up to 1A Load Current
High Efficiency
- 90% Full-Load Efficiency (V_IN = 24V, V_OUT = 5V, I_OUT = 1A)
- 2.2µA (typ) Shutdown Current
- High Light-Load Efficiency with PFM Mode (MAX17645D)
Flexible Design
- Programmable EN/UVLO Threshold
- Monotonic Startup into Prebiased Output
- Open-Drain Output (RESET) for Output Status Monitoring
Robust Operation
- Built-in Hiccup Mode Overload Protection
- Overtemperature Protection
- CISPR32 Class B Compliant
- Wide -40°C to +125°C Ambient Operating Temperature/-40°C to +150°C Junction Temperature

Pin Description

19-101430; Rev 1; 3/22

Key Features

Reduces External Components and Total Cost
- No Schottky—Synchronous Operation
- Internal Control Loop Compensation
- Internal Soft-Start
- All Ceramic Capacitors, Ultra-Compact Layout
Reduces Number of DC-DC Regulators to Stock
- Wide 4.5V to 36V Input Voltage Range
- Adjustable Output from 0.9V up to 89% of V_IN
- Delivers Up to 1A Load Current
High Efficiency
- 90% Full-Load Efficiency (V_IN = 24V, V_OUT = 5V, I_OUT = 1A)
- 2.2μA (typ) Shutdown Current
- High Light-Load Efficiency with PFM Mode (MAX17645D)
Flexible Design
- Programmable EN/UVLO Threshold
- Monotonic Startup into Prebiased Output
- Open-Drain Output (Actiive-Low RESET) for Output Status Monitoring
Robust Operation
- Built-In Hiccup Mode Overload Protection
- Overtemperature Protection
- CISPR32 Class B Compliant
- Wide -40°C to +125°C Ambient Operating Temperature/-40°C to +150°C Junction Temperature

Applications/Uses

Factory Automation
Aftermarket Market Automation
General Point of Load

Description

The MAX17645 is a high-efficiency, high voltage, synchronous step-down DC-DC converter with integrated MOSFETs, operates over a 4.5V to 36V input. It can deliver up to 1A load current. The MAX17645 operates at 650kHz switching frequency. The MAX17645B operates in pulse-width modulation (PWM) mode at all loads. The MAX17645D operates in pulse-frequency modulation (PFM) mode at light loads. The output voltage is programmable from 0.9V up to 89% of VIN. Built-in control loop compensation across the output voltage range eliminates the need for external compensation components. The feedback voltage regulation accuracy over -40°C to +125°C is ±1.1%.

The device features a peak-current-mode control architecture. In this architecture, while operating in PWM mode the part sets the duty cycle using a transconductance error amplifier, a PWM comparator, a high-side current-sense amplifier, and a slope-compensation generator. At each rising edge of the clock, the high-side MOSFET turns on and remains on until either the appropriate or maximum duty cycle is reached, or the peak current limit is detected. During the high-side MOSFET’s on-time, the inductor current ramps up. During the rest of the switching cycle, the high-side MOSFET remains off and the low-side MOSFET remains on, inductor current ramps down. An appropriate dead time is implemented between the high-side and low-side state transitions to avoid cross conduction.

A fixed soft-start time of 3.15ms (typ) allows users to reduce input inrush current. The device also features an 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 feature provides a power-good signal to the system upon achieving successful regulation of the output voltage.

Simplified Block Diagram

Technical Docs

Data Sheet

4.5V to 36V, 1A, High-Efficiency, Synchronous Step-Down DC-DC Converter

Jun 24, 2022

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

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INTERACTIVE Data Sheet

MAX17645

4.5V to 36V, 1A, High-Efficiency, Synchronous Step-Down DC-DC Converter

Product Details

Overview

Key Applications

Key Features

Applications/Uses

Simplified Block Diagram

Technical Docs

Design & Development

EE-Sim: Design & Simulate MAX17645

EE-Sim: Design & Simulate MAX17645

Support & Training

Overview

Key Features

Applications/Uses

Description

Simplified Block Diagram

Technical Docs

Support & Training

MAX17645 Related Videos