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72V, 1A, Automotive Synchronous Step-Down DC-DC Converter

72V Synchronous Buck Converter with Internal FETs Enables High Efficiency and Low Temperature Rise

Product Details

The MAX20059 is a high-efficiency, high-voltage, synchronous step-down DC-DC converter IC with integrated MOSFETs that operates over a 4.5V to 72V input. The converters can deliver up to 1A current. Output voltage is programmable from 0.8V to 90%VIN. The feedback voltage-regulation accuracy over -40&degC to +125°C is ±1.5%.

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

The MAX20059 is available in a 12-pin (3mm x 3mm) side-wettable TDFN package with an exposed pad for thermal heat dissipation.

Key Features

  • Synchronous DC-DC Converters with Integrated FETs
    • 72V Input for 48V Systems
    • Internal Compensation
  • Flexibility
    • Output Adjustable from 0.8V to 90%VIN
    • 200kHz to 2200kHz Adjustable Frequency with External Clock Synchronization
    • Programmable Peak Current Limit (1.14A or 1.6A)
  • Active-Low RESET Output and EN Input (26V max) Simplify Power Sequencing
  • Protection Features and Operating Range Ideal for Automotive Applications
    • Programmable EN/UVLO Threshold
    • Adjustable Soft-Start and Prebiased Power-Up
    • Thermal Shutdown
    • -40&degC to +125&degC Automotive Temperature Range
    • AEC-Q100 Qualified

Applications/Uses

  • 48V Systems
  • Mild Hybrid Applications
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 76
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 18
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) 750
800
900
1200
1700
2000
220
250
275
300
330
350
400
440
500
540
560
600
700
2200
Design Tools EE-Sim
Package/Pins TDFN/12
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Simplified Block Diagram

MAX20059: Functional Diagram MAX20059: Functional Diagram Zoom icon

Technical Docs

Design & Development

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

Description

The MAX20059 EV kit is a proven design to evaluate the MAX20059 high-efficiency, high-voltage, synchronous step-down DC-DC converter IC in a TDFN package. The EV kit is optimized to generate a 5V output at load currents up to 1A from a 48V input supply, and can be reconfigured to meet other system requirements. The EV kit features a 400kHz switching frequency. The EV kit can be used to monitor the IC’s features, such as adjustable input undervoltage lockout, adjustable soft-start, adjustable switching frequency, adjustable current limit, open-drain active-low RESET signal, and external frequency synchronization.

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Features

  • Operates from 6.5V to 72V at 48V Nominal Input
  • Meets Stringent OEM Module Power Consumption and Performance Specifications
  • 5V Output Voltage at 400kHz Switching Frequency
  • Up to 1A Output Current with Adjustable Peak- Current Limit
  • Jumpers for Quickly Adjusting Peak-Current Limit and Mode Selection
  • Auxiliary Bootstrap LDO to Improve Efficiency
  • Adjustable Soft-Start Time with External Capacitor
  • Optimized Application Layout and Components for Quick Design Implementation
  • Proven PCB Layout
  • Fully Assembled and Tested

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Tools & Models

EE-Sim: Design & Simulate MAX20059

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Support & Training

Search our knowledge base for answers to your technical questions.

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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) 18
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) 750
800
900
1200
1700
2000
220
250
275
300
330
350
400
440
500
540
560
600
700
2200
Design Tools EE-Sim
Package/Pins TDFN/12

Key Features

  • Synchronous DC-DC Converters with Integrated FETs
    • 72V Input for 48V Systems
    • Internal Compensation
  • Flexibility
    • Output Adjustable from 0.8V to 90%VIN
    • 200kHz to 2200kHz Adjustable Frequency with External Clock Synchronization
    • Programmable Peak Current Limit (1.14A or 1.6A)
  • Active-Low RESET Output and EN Input (26V max) Simplify Power Sequencing
  • Protection Features and Operating Range Ideal for Automotive Applications
    • Programmable EN/UVLO Threshold
    • Adjustable Soft-Start and Prebiased Power-Up
    • Thermal Shutdown
    • -40&degC to +125&degC Automotive Temperature Range
    • AEC-Q100 Qualified

Applications/Uses

  • 48V Systems
  • Mild Hybrid Applications

Description

The MAX20059 is a high-efficiency, high-voltage, synchronous step-down DC-DC converter IC with integrated MOSFETs that operates over a 4.5V to 72V input. The converters can deliver up to 1A current. Output voltage is programmable from 0.8V to 90%VIN. The feedback voltage-regulation accuracy over -40&degC to +125°C is ±1.5%.

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

The MAX20059 is available in a 12-pin (3mm x 3mm) side-wettable TDFN package with an exposed pad for thermal heat dissipation.

Simplified Block Diagram

MAX20059: Functional Diagram MAX20059: Functional 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