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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

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 76
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 68.4
IOUT1 (A) (max) 1
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 200
600
Design Tools EE-Sim
Package/Pins TDFN-CU/12
Budgetary
Price (See Notes)
2.28
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 76
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 68.4
IOUT1 (A) (max) 1
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 200
600
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=8996', '')
Package/Pins TDFN-CU/12
Budgetary
Price (See Notes)
2.28

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
    • 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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX17761: Functional (or Block) Diagram MAX17761: Functional (or Block) Diagram 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 .