4.5V to 42V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter

 

Part Number	Replacement	Explanation

Description

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The MAX17682 is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to provide isolated power up to 10W. The device operates over a wide 4.5V to 42V input voltage range and uses primary-side feedback to regulate the output voltage. It delivers primary peak current up to 3.7A and regulates primary output voltage to within ±1.2% over -40°C to +125°C.

The device features peak-current-mode control with pulse-width modulation (PWM) scheme. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.

A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired inputvoltage level. An open-drain, active-low RESETB pin provides a delayed power-good signal to the system upon achieving successful regulation of the primary output voltage.

The device operates over the -40°C to +125°C industrial temperature range and is available in a compact 20-pin (4mm x 4mm) TQFN package. Simulation models are available.

MAX17682: Typical Application Circuit Enlarge+

Key Features

• Eliminates External Components and Reduces Total Cost
  • Synchronous Primary Operation for High Efficiency and Reduced Cost
  • All-Ceramic Capacitors, Ultra-Compact Layout
• Reduces Number of DC-DC Regulators to Stock
  • Wide 4.5V to 42V Input Voltage Range
  • 0.9V to 92% V_IN Primary Output Voltage
  • Delivers up to 3.7A Peak Current
  • 100kHz to 500kHz Adjustable Frequency with External Synchronization
  • Available in a 20-Pin, 4mm x 4mm TQFN Package
• Reduces Power Dissipation
  • Peak Efficiency > 90%
  • Shutdown Current = 2.8µA (typ)
• Operates Reliably in Adverse Industrial Environments
  • Hiccup-Mode Current Limit, Sink Current Limit, and Auto-Retry Startup
  • Programmable EN/UVLO Threshold
  • Adjustable Soft-Start
  • High Industrial -40°C to +125°C Ambient Operating Temperature Range
  • -40°C to +150°C Junction Temperature Range

Applications/Uses

• Communication Hub in Smart Meters
• Floating Power Supply Generation
• Industrial Process Control
• Isolated Power Supplies in Medical Equipment