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MAX5080, MAX5081

1A, 40V, MAXPower Step-Down DC-DC Converters

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Active: In Production.


The MAX5080/MAX5081 are 250kHz PWM step-down DC-DC converters with an on-chip, 0.3Ω high-side switch. The input voltage range is 4.5V to 40V for the MAX5080 and 7.5V to 40V for the MAX5081. The output is adjustable from 1.23V to 32V and can deliver up to 1A of load current.

Both devices utilize a voltage-mode control scheme for good noise immunity in the high-voltage switching environment and offer external compensation allowing for maximum flexibility with a wide selection of inductor values and capacitor types. The switching frequency is internally fixed at 250kHz and can be synchronized to an external clock signal through the SYNC input. Light load efficiency is improved by automatically switching to a pulse-skip mode.

All devices include programmable undervoltage lockout and soft-start. Protection features include cycle-by-cycle current limit, hiccup-mode output short-circuit protection, and thermal shutdown. Both devices are available in a space-saving, high-power (2.7W), 16-pin TQFN package and are rated for operation over the -40°C to +125°C temperature range.

Data Sheet

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An evaluation board is available: MAX5080EVKIT

Key Features

  • 4.5V to 40V (MAX5080) or 7.5V to 40V (MAX5081) Input Voltage Range
  • 1A Output Current
  • VOUT Range From 1.23V to 32V
  • Internal High-Side Switch
  • Fixed 250kHz Internal Oscillator
  • Automatic Switchover to Pulse-Skip Mode at Light Loads
  • External Frequency Synchronization
  • Thermal Shutdown and Short-Circuit Protection
  • Operates Over the -40°C to +125°C Temperature Range
  • Space-Saving (5mm x 5mm) High-Power 16-Pin TQFN Package


  • Automotive
  • Distributed Power
  • FireWire® Power Supplies
  • Industrial

Key Specifications:

Step-Down Switching Regulators
Part Number VIN
Output Adjust. Method IOUT1 (max)
Switch Type DC-DC Outputs Oper. Freq.
min max min max See Notes
MAX5080  4.5 40 1.23 32 Resistor 1 Internal 1 250 $3.48 @1k
MAX5081  7.5 $2.29 @1k
See All Step-Down Switching Regulators (310)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX5080, MAX5081: Typical Operating Circuit
Typical Operating Circuit

More Information

New Product Press Release   2005-05-26 ]

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Information Index

Document Ref.: 19-3656 Rev 1; 2007-02-21
This page last modified: 2007-02-21