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4.5V to 76V, 300mA, High-Efficiency, Synchronous Step-Down DC-DC Converter

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

Product Details

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power supply solutions. The MAX17760 is a high-efficiency, high-voltage, Himalaya synchronous step-down DC-DC converter with integrated MOSFETs operating over an input-voltage range of 4.5V to 76V. The device can deliver up to 300mA current. Output voltage is programmable from 0.8V up to 88% of input voltage (VIN). Built-in control loop compensation eliminates the need for external components.

The MAX17760 features a peak-current-mode control architecture. The device can be operated in either the forced pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. Forced PWM mode provides constant frequency operation at all loads for frequency sensitive applications, while PFM mode provides superior light-load efficiency by skipping pulses. The device integrates an open drain active-low RESET output voltage monitor, adjustable input undervoltage lockout (EN/UVLO) and programmable soft-start.

The feedback voltage regulation accuracy over -40°C to +125°C is +1.6% to -1.7%. The MAX17760 is available in a compact 12-pin (3mm x 3mm) TDFN package. Simulation models are available.

Key Features

  • 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
    • Adjustable Output Range from 0.8V up to 88% of VIN
    • Up to 300mA Output Current
    • 200kHz, 300kHz, 400kHz, and 600kHz Programmable Switching Frequency with External Clock Synchronization
  • Reduces Power Dissipation
    • 93% Peak Efficiency
    • PFM Mode Enables Enhanced Light-Load Efficiency
    • EXTVCC Bootstrap Input for Improved Efficiency
    • 5µA Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Built-in Hiccup Mode Overload Protection
    • Programmable Soft-Start and Prebiased Power-up
    • Built-in Output-Voltage Monitoring with active-low RESET
    • Programmable EN/UVLO Threshold
    • Overtemperature Protection
    • CISPR 22 Class B Compliant
    • Wide -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range

Applications/Uses

  • Industrial Control Power Supplies
  • General Purpose Point-of-Load
  • Distributed Supply Regulation
  • Base Station Power Supplies
  • Wall Transformer Regulation
  • High Voltage Single-Board Systems
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 76
VOUT1 (V) (min) 0.9
VOUT1 (V) (max) 67
IOUT1 (A) (max) 0.3
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (typ) 0.075
# DC-DC Outputs 1
Switching Frequency (kHz) 400
Design Tools EE-Sim
Package/Pins TDFN-CU/12
Budgetary
Price (See Notes)
$1.29 @1k
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Simplified Block Diagram

MAX17760: Simplified Application Circuit MAX17760: Simplified Application Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX17760AEVKIT# evaluation kit (EV kit) provides a proven design to evaluate the MAX17760 high-efficiency, high-voltage, synchronous step-down DC-DC converter in a TDFN package. The EV kit generates 5V at load currents up to 300mA from a 7V 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, 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 MAX17760 IC data sheet.

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Features

  • Operates from a 7V to 76V Input Supply
  • 5V Output Voltage
  • Up to 300mA Output Current
  • 400kHz Switching Frequency
  • Enable/UVLO Input, Resistor-Programmable UVLO Threshold
  • Adjustable Soft-Start Time
  • MODE Pin to Select between PWM or PFM Modes
  • Bootstrap Bias Input for Improved 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

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Tools & Models

EE-Sim: Design & Simulate MAX17760

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 76
VOUT1 (V) (min) 0.9
VOUT1 (V) (max) 67
IOUT1 (A) (max) 0.3
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (typ) 0.075
# DC-DC Outputs 1
Switching Frequency (kHz) 400
Design Tools EE-Sim
Package/Pins TDFN-CU/12
Budgetary
Price (See Notes)
$1.29 @1k

Key Features

  • 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
    • Adjustable Output Range from 0.8V up to 88% of VIN
    • Up to 300mA Output Current
    • 200kHz, 300kHz, 400kHz, and 600kHz Programmable Switching Frequency with External Clock Synchronization
  • Reduces Power Dissipation
    • 93% Peak Efficiency
    • PFM Mode Enables Enhanced Light-Load Efficiency
    • EXTVCC Bootstrap Input for Improved Efficiency
    • 5µA Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Built-in Hiccup Mode Overload Protection
    • Programmable Soft-Start and Prebiased Power-up
    • Built-in Output-Voltage Monitoring with active-low RESET
    • Programmable EN/UVLO Threshold
    • Overtemperature Protection
    • CISPR 22 Class B Compliant
    • Wide -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range

Applications/Uses

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

Description

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power supply solutions. The MAX17760 is a high-efficiency, high-voltage, Himalaya synchronous step-down DC-DC converter with integrated MOSFETs operating over an input-voltage range of 4.5V to 76V. The device can deliver up to 300mA current. Output voltage is programmable from 0.8V up to 88% of input voltage (VIN). Built-in control loop compensation eliminates the need for external components.

The MAX17760 features a peak-current-mode control architecture. The device can be operated in either the forced pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. Forced PWM mode provides constant frequency operation at all loads for frequency sensitive applications, while PFM mode provides superior light-load efficiency by skipping pulses. The device integrates an open drain active-low RESET output voltage monitor, adjustable input undervoltage lockout (EN/UVLO) and programmable soft-start.

The feedback voltage regulation accuracy over -40°C to +125°C is +1.6% to -1.7%. The MAX17760 is available in a compact 12-pin (3mm x 3mm) TDFN package. Simulation models are available.

Simplified Block Diagram

MAX17760: Simplified Application Circuit MAX17760: Simplified Application Circuit Zoom icon

Technical Docs

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