MAX5074 Power IC with Integrated MOSFETs for Isolated IEEE 802.3af PD and Telecom Power-Supply Applications

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The MAX5074 isolated PWM power IC features integrated switching power MOSFETs connected in a voltageclamped, two-transistor, power-circuit configuration. This device can be used in both forward and flyback configurations with a wide input voltage range from 11V to 76V and up to 15W of output power.

The voltage-clamped power topology enables full recovery of stored magnetizing and leakage inductive energy for enhanced efficiency and reliability. A lookahead signal for driving secondary-side synchronous rectifiers can be used to increase efficiency.

A wide array of protection features includes UVLO, overtemperature shutdown, and short-circuit protection with hiccup current limit for enhanced performance and reliability. Operation up to 500kHz allows smaller external magnetics and capacitors.

The MAX5074 is rated for operation over the -40°C to +125°C temperature range and is available in a 20-pin TSSOP package.

Warning: The MAX5074 is designed to work with high voltages. Exercise caution.

Key Features

Applications/Uses

	Clamped, Two-Switch Power IC for High Efficiency
	No Reset Winding Required
	Up to 15W Output Power
	Bias Voltage Regulator with Automatic High- Voltage Supply Turn-Off
	11V to 76V Wide Input Voltage Range
	Integrated High-Voltage 0.4 Power MOSFETs
	Feed-Forward Voltage-Mode Control For Fast Input Transient Rejection
	Programmable Brownout Undervoltage Lockout
	Internal Overtemperature Shutdown
	Indefinite Short-Circuit Protection With Programmable Fault Integration
	Integrated Look-Ahead Signal for Secondary-Side Synchronous Rectification
	>90% Efficiency with Synchronous Rectification
	Up to 500kHz Switching Frequency
	High-Power (1.74W), Small-Footprint 20-Pin Thermally Enhanced TSSOP Package

	48V Input, Isolated Power-Supply Modules
	ADSL Line Cards
	ADSL Line-Driver Power Supplies
	Distributed Power Systems with 48V Bus
	High-Efficiency Telecom/Datacom Power Supplies
	IEEE 802.3af PD Power Supplies
	Isolated IP Phone Power Supplies
	WLAN Access-Point 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)

Current Sense Threshold (mV)

EV-Kit

RoHS Available

Package

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

Operating Temp. Range (°C)

Price^*

MAX5074

•	Base Station (24V)

•	Industrial (24V)

•	Networking (48V)

•	Power Over Ethernet (32-58V)

•	Telecom (36-72V)

Flyback
Two-Switch Forward

•	Adjustable Frequency

•	Internal Power MOSFET(s)

•	Synchronous Rectifier Driver

•	Thermal Shutdown

•

UVLO

Voltage Mode

Opto

500

4.4

156

Yes

TSSOP/20

-40 to +125

$1.52 @ 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.