MAX17761

PRODUCTION

4.5V to 76V, 1A, High-Efficiency, Synchronous Step-Down DC-DC Converter

76V Synchronous Buck Converter with Internal FETs Enables High Efficiency and Low Temperature Rise

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • Reduces External Components and Total Cost
    • No Schottky—Synchronous Operation
    • Internal Compensation Components
    • All-Ceramic Capacitors, Compact Layout
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4.5V to 76V Input
    • Output Adjustable from 0.8V up to 90% of VIN
    • Delivers up to 1A Over Temperature
    • 200kHz to 600kHz Adjustable Frequency with External Clock Synchronization
    • Programmable Current Limit
  • Reduces Power Dissipation
    • Peak Efficiency > 90%
    • PFM Mode Enables Enhanced Light-Load Efficiency
    • Auxiliary Bootstrap LDO for Improved Efficiency
    • 5μA Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Adjustable Soft-Start and Prebiased Power-Up
    • Built-in Output-Voltage Monitoring with Active-low RESET
    • Programmable EN/UVLO Threshold
    • Monotonic Startup into Prebiased Load
    • Overtemperature Protection
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range

The MAX17761, high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 76V input. The converter can deliver up to 1A current. Output voltage is programmable from 0.8V up to 90% of VIN. The feedback voltage regulation accuracy over -40°C to +125°C is ±1.5%.

The device features a peak-current-mode control architecture and can be operated in either the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes.

The MAX17761 is available in a 12-pin (3mm x 3mm) TDFN package. Simulation models are available.

Applications

  • Basestation Power Supplies
  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • High-Voltage, Single-Board Systems
  • Industrial Control Power Supplies
  • Wall Transformer Regulation
MAX17761
4.5V to 76V, 1A, High-Efficiency, Synchronous Step-Down DC-DC Converter
MAX17761: Functional (or Block) Diagram
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Documentation

Data Sheet 1

Evaluation Design File 2

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • MAX17761

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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SIMPLIS Models 1

LTspice

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

MAX17761EVKITBE

Evaluation Kit for the MAX17761 in 5V Output-Voltage Application

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Features and Benefits

  • Operates from a 7.5V to 76V Input Supply
  • 5V Output Voltage
  • Up to 1A Output Current
  • 400kHz Switching Frequency
  • Enable/UVLO Input, Resistor-Programmable UVLO Threshold
  • Adjustable Soft-Start Time
  • MODE/ILIM Pin to Select Among PWM or PFM Modes and 1.6A or 1.14A current limits
  • Auxiliary Bootstrap LDO to improve efficiency
  • Open-Drain Active-Low RESET Output
  • External Clock Synchronization
  • Overcurrent and Overtemperature Protection
  • Proven PCB Layout
  • Fully Assembled and Tested
  • Complies with CISPR22(EN55022) Class B Conducted and Radiated Emissions

Product Details

The MAX17761EVKITBE# provides a proven design to evaluate the MAX17761 high-efficiency, high-voltage, synchronous step-down DC-DC converter in a TDFN package. The EV kit generates 5V at load currents up to 1A from a 7.5V to 76V input supply. The EV kit features a 400kHz switching frequency for optimum efficiency and component size. The EV kit features adjustable input undervoltage lockout, adjustable soft-start, adjustable switching frequency, adjustable current limit, open-drain active-low RESET signal, and external clock synchronization. The EV kit also provides 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 MAX17761 IC data sheet.

Applications

  • Basestation Power Supplies
  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • High-Voltage, Single-Board Systems
  • Industrial Control Power Supplies
  • Wall Transformer Regulation

MAX17761EVKITA

Evaluation Kit for the MAX17761 in 3.3V Output-Voltage Application

Buy Now View Details

Features and Benefits

  • Operates from a 4.5V to 76V Input Supply
  • 3.3V Output Voltage
  • Up to 1A Output Current
  • 400kHz Switching Frequency
  • Enable/UVLO Input, Resistor-Programmable UVLO Threshold
  • Adjustable Soft-Start Time
  • MODE/ILIM Pin to Select Among PWM or PFM Modes and 1.6A or 1.14A current limits
  • Auxiliary Bootstrap LDO to improve efficiency
  • Open-Drain Active-Low RESET Output
  • External Frequency Synchronization
  • Overcurrent and Overtemperature Protection
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX17761 3.3V output EV kit is a proven design to evaluate the MAX17761 high-efficiency, high-voltage, synchronous step-down DC-DC converter in a TDFN package. The EV kit generates 3.3V at load currents up to 1A from a 4.5V to 76V input supply. The EV kit features a 400kHz switching frequency for optimum efficiency and component size. The EV kit features adjustable input undervoltage lockout, adjustable soft-start, adjustable switching frequency, adjustable current limit, open-drain active-low RESET signal and external frequency synchronization.

Applications

  • Basestation Power Supplies
  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • High-Voltage, Single-Board Systems
  • Industrial Control Power Supplies
  • Wall Transformer Regulation

MAX17761EVKITB

Evaluation Kit for the MAX17761 in 5V Output-Voltage Application

Buy Now View Details

Features and Benefits

  • Operates from a 6.5V to 76V Input Supply
  • 5V Output Voltage
  • Up to 1A Output Current
  • 400kHz Switching Frequency
  • Enable/UVLO Input, Resistor-Programmable UVLO Threshold
  • Adjustable Soft-Start Time
  • MODE/ILIM Pin to Select Among PWM or PFM Modes and 1.6A or 1.14A current limits
  • Auxiliary Bootstrap LDO to improve efficiency
  • Open-Drain Active-Low RESET Output
  • External Frequency Synchronization
  • Overcurrent and Overtemperature Protection
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX17761 5V output EV kit is a proven design to evaluate the MAX17761 high-efficiency, high-voltage, synchronous step-down DC-DC converter in a TDFN package. The EV kit generates 5V at load currents up to 1A from a 6.5V to 76V input supply. The EV kit features a 400kHz switching frequency for optimum efficiency and component size. The EV kit features adjustable input undervoltage lockout, adjustable soft-start, adjustable switching frequency, adjustable current limit, open-drain active-low RESET signal and external frequency synchronization.

Applications

  • Basestation Power Supplies
  • Distributed Supply Regulation
  • General-Purpose Point-of-Load
  • High-Voltage, Single-Board Systems
  • Industrial Control Power Supplies
  • Wall Transformer Regulation
MAX17761EVKITBE
Evaluation Kit for the MAX17761 in 5V Output-Voltage Application
MAX17761EVKITA
Evaluation Kit for the MAX17761 in 3.3V Output-Voltage Application
MAX17761EVKITB
Evaluation Kit for the MAX17761 in 5V Output-Voltage Application

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