High-Frequency, Current-Mode PWM Controller with Accurate Oscillator and Dual FET Drivers

2.5MHz, Universal-Input, Dual-Output PWM Controller with Precision-Programmable Switching Frequency and Start/Stop Voltage
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Active: In Production.


The MAX5069 is a high-frequency, current-mode, pulse-width modulation (PWM) controller (with dual MOSFET drivers) that integrates all the building blocks necessary for implementing AC-DC or DC-DC fixed-frequency power supplies. Isolated or nonisolated pushpull and half/full-bridge power supplies are easily constructed using either primary- or secondary-side regulation. Current-mode control with leading-edge blanking simplifies control-loop design and a programmable internal slope-compensation circuit stabilizes the current loop when operating at duty cycles above 50%.

An input undervoltage lockout (UVLO) programs the input-supply startup voltage and ensures proper operation during brownout conditions.

A single external resistor programs the oscillator frequency from 50kHz to 2.5MHz. The MAX5069A/D provide a SYNC input for synchronization to an external clock. The maximum FET-driver duty cycle for the MAX5069 is 50%. Programmable dead time allows additional flexibility in optimizing magnetic design and overcoming parasitic effects. Programmable hiccup current limit provides additional protection under severe faults.

The MAX5069 is specified over the -40°C to +125°C automotive temperature range and is available in a 16-pin thermally enhanced TSSOP-EP package. Refer to the MAX5068 data sheet for single FET-driver applications.

Warning: The MAX5069 is designed to work with high voltages. Exercise caution.

Data Sheet

Download this datasheet in PDF formatDownload Rev 2 (PDF, 244kB)
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An evaluation board is available: MAX5069AEVKIT

Key Features

  • Current-Mode Control with 47µA (typ) Startup Current
  • Oscillator Frequency Programmable to 2.5MHz
  • Resistor-Programmable ±4.5% Accurate Switching Frequency
  • Dual Gate-Drive Output for Half/Full-Bridge or Push-Pull Applications
  • Rectified 85VAC to 265VAC, or 36VDC to 72VDC Input (MAX5069A/B)
  • Input Directly Driven from 10.8V to 24V (MAX5069C/D/E)
  • Programmable Dead Time and Slope Compensation
  • Programmable Startup Voltage (UVLO)
  • Programmable UVLO Hysteresis (MAX5069B/C/E)
  • Frequency Synchronization Input (MAX5069A/D)
  • -40°C to +125°C Automotive Temperature Range
  • 16-Pin Thermally Enhanced TSSOP-EP Package


  • Industrial Power Conversion
  • Isolated Telecom Power Supplies
  • Networking System Power Supplies
  • Server Power Supplies
  • Universal-Input AC Power Supplies

Key Specifications:

Isolated Power Supplies
Part Number Application (VIN) VIN
Topology Feedback Freq.
Duty Cycle
Gate Drive Current
Oper. Temp.
min max max max max See Notes
Base Station (24V)
Industrial (24V)
Networking (48V)
Power Over Ethernet (32-58V)
Telecom (36-72V)
Universal Off-line (90-240VAC)
2500 50 0.09 3 1 -40 to +125 $4.03 @1k
See All Isolated Power Supplies (24)

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.


MAX5069: Functional Diagram
Functional Diagram

More Information

New Product Press Release   2004-03-12 ]

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Information Index

Document Ref.: 19-3175 Rev 2; 2010-03-17
This page last modified: 2010-03-17