Step-down DC/DC converter MAX17521 / MAX17558 / MAX17559

step-down DC/DC converter
step-down DC/DC converter
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Electrical characteristics
step-down, high-voltage
Other characteristics
switching, compact, dual-output, programmable, adjustable, PWM, soft-start
Input voltage

Min.: 4.5 V

Max.: 60 V

Output voltage

Min.: 0.9 V

Max.: 55 V


Create a design and simulate using EE-Sim® tools: MAX17521 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. 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


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