MAX5069 High-Frequency, Current-Mode PWM Controller with Accurate Oscillator and Dual FET Drivers

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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.

Key Features

Applications/Uses

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)
Programmable Dead Time and Slope Compensation
Programmable Startup Voltage (UVLO)
Programmable UVLO Hysteresis (MAX5069B/C)
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 (Nominal Input Voltage)

V_IN (min) (V)

V_IN (max) (V)

Topology

Features

Control Loop

Feedback Type

Frequency (kHz)

Max. Duty Cycle (%)

Start-Up Current (max) (mA)

Operating Current, I_CC (max) (mA)

Gate Drive Current (A)

Current Sense Threshold (mV)

EV-Kit

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX5069

•	Networking (48V)

•	Telecom (36-72V)

•	Universal Off-line (90-240VAC)

10.8

Full-Bridge
Half-Bridge
Push-Pull

•	Adjustable Frequency

•	High Voltage Start-Up Circuit

•	Internal Error Amplifier

•	Synchronizable Freqeuncy

•	Thermal Shutdown

•

UVLO

Current Mode

Linear
Opto

2,500

0.09

314

Yes

TSSOP/16

-40 to +125

$1.56 @ 1k

See All Isolated Power Supplies (29)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.