Top

60V, 1A, Dual-Output, High-Efficiency, Synchronous Step-Down DC-DC Converter

Industry's First 60V, 1A Dual Step-Down DC-DC Converter with Integrated MOSFETs

Product Details

The MAX17521 dual-output, high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 60V input. The converter can deliver up to 1A at each output. Each output is programmable from 0.9V to 92%VIN. The feedback voltage regulation accuracy over -40°C to +125°C is ±1.7%.

The MAX17521 uses peak-current-mode control. Each output can be operated in the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes.

The MAX17521 is available in a 24-pin (4mm x 5mm) TQFN package. Simulation models are available.

Key Features

  • Reduces External Components and Total Cost
    • No Schottky—Synchronous Operation
    • All-Ceramic Capacitors, Compact Layout
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4.5V to 60V Input
    • Each Output Adjustable From 0.9V to 92%VIN
    • Pin-Selectable 560kHz or 300kHz Switching Frequency
    • Independent Input Voltage Pin for Each Output
  • Reduces Power Dissipation
    • Peak Efficiency > 90%
    • PFM Mode Enables Enhanced Light-Load Efficiency
    • 1μA Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Hiccup Mode Overload Protection
    • Adjustable Soft-Start Pin for Each Output
    • Built-In Output Voltage Monitoring with Active-Low RESET for Each Output
    • Adjustable EN/UVLO Threshold for Each Output
    • 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

  • CPU, DSP, or FPGA Power
  • Distributed Supply Regulation
  • General-Purpose Point of Load
  • Industrial Control Power Supplies
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 60
VOUT1 (V) (min) 0.9
VOUT1 (V) (max) 55
IOUT1 (A) (max) 1
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 300
560
Design Tools EE-Sim
Package/Pins TQFN-CU/24
Budgetary
Price (See Notes)
$3.10 @1k
View More

Simplified Block Diagram

MAX17521: Block Diagram MAX17521: Block Diagram Zoom icon

Technical Docs

Design & Development

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

Description

The MAX17521 evaluation kit (EV kit) provides a proven design to evaluate the MAX17521 dual high-efficiency, high-voltage, synchronous step-down DC-DC converter. The EV kit generates 3.3V and 5V output voltages at load currents up to 1A from a 7V to 60V input supply. The EV kit features a switching-frequency selector pin and individual mode-of-operation selector pins, enable/under-voltage-lockout (EN/UVLO) pins, programmable soft-start pins, and open-drain active-low RESET_ signals for each output.

View Details

Features

  • Operates from a 7V to 60V Input Supply
  • Dual-Output Voltage: 3.3V and 5V
  • Up to 1A Output Current
  • Pin-Selectable Switching Frequency
  • Enable/UVLO Input, Resistor-Programmable UVLO Threshold
  • Mode-Selection Pin for Each Output to Select Between PWM and PFM Modes
  • Adjustable Soft-Start Time for Each Output
  • Open-Drain Active-Low RESET_ Signals for Each Output
  • External Frequency Synchronization
  • Overcurrent and Overtemperature Protection
  • Proven PCB Layout
  • Fully Assembled and Tested

/en/design/design-tools/ee-sim.html?

Tools & Models

EE-Sim: Design & Simulate MAX17521

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

Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 60
VOUT1 (V) (min) 0.9
VOUT1 (V) (max) 55
IOUT1 (A) (max) 1
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 300
560
Design Tools EE-Sim
Package/Pins TQFN-CU/24
Budgetary
Price (See Notes)
$3.10 @1k

Key Features

  • Reduces External Components and Total Cost
    • No Schottky—Synchronous Operation
    • All-Ceramic Capacitors, Compact Layout
  • Reduces Number of DC-DC Regulators to Stock
    • Wide 4.5V to 60V Input
    • Each Output Adjustable From 0.9V to 92%VIN
    • Pin-Selectable 560kHz or 300kHz Switching Frequency
    • Independent Input Voltage Pin for Each Output
  • Reduces Power Dissipation
    • Peak Efficiency > 90%
    • PFM Mode Enables Enhanced Light-Load Efficiency
    • 1μA Shutdown Current
  • Operates Reliably in Adverse Industrial Environments
    • Hiccup Mode Overload Protection
    • Adjustable Soft-Start Pin for Each Output
    • Built-In Output Voltage Monitoring with Active-Low RESET for Each Output
    • Adjustable EN/UVLO Threshold for Each Output
    • 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

  • CPU, DSP, or FPGA Power
  • Distributed Supply Regulation
  • General-Purpose Point of Load
  • Industrial Control Power Supplies

Description

The MAX17521 dual-output, high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 60V input. The converter can deliver up to 1A at each output. Each output is programmable from 0.9V to 92%VIN. The feedback voltage regulation accuracy over -40°C to +125°C is ±1.7%.

The MAX17521 uses peak-current-mode control. Each output can be operated in the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes.

The MAX17521 is available in a 24-pin (4mm x 5mm) TQFN package. Simulation models are available.

Simplified Block Diagram

MAX17521: Block Diagram MAX17521: 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