QuickView - MAX5042, MAX5043 Two-Switch Power ICs with Integrated Power MOSFETs and Hot-Swap Controller

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The MAX5042/MAX5043 isolated multimode PWM power ICs feature integrated switching power MOSFETs connected in a voltage-clamped, two-transistor, power-circuit configuration. These devices operate from a wide 20V to 76V input voltage range. The MAX5042 includes a hotswap controller for use with an external power MOSFET to limit inrush current for applications where the power supply is plugged into a live power backplane. The MAX5043 does not include a hot-swap controller.

The voltage-clamped power topology of the MAX5042/MAX5043 enables full recovery of stored magnetizing and leakage inductive energy for enhanced efficiency and reliability. Operating at up to 500kHz switching frequency, these devices provide up to 50W of output power. The MAX5042/MAX5043 allow the implementation of both forward and flyback voltage or current-mode converter topologies. A dedicated latched external shutdown provides protection in addition to internal thermal shutdown.

The MAX5042/MAX5043 achieve higher efficiency when used with secondary-side synchronous rectification. These devices generate a look-ahead signal for driving secondary-side synchronous rectifiers.

The MAX5042/MAX5043 are rated for operation over the -40°C to +125°C and -40°C to +85°C temperature range, respectively, and are available in a small surfacemount 56-pin thin QFN package.

Warning: The MAX5042/MAX5043 are designed to work with high voltages. Exercise caution.

Key Features

Applications/Uses

Reliable Single-Stage Clamped Two-Switch Power ICs for High Efficiency
No Reset Winding Required
Up to 50W Output Power
Integrated High-Voltage 75mΩ Power MOSFETs
20V to 76V Wide Input Voltage Range
Feed-Forward Voltage or Current-Mode Control
Programmable Brownout Undervoltage Lockout
Integrated Current Signal Amplifier for High-Efficiency, Current-Mode Control
Internal Overtemperature Shutdown
Indefinite Short-Circuit Protection
Integrated Thermally Protected High-Voltage Startup Linear Regulator
Integrated Hot-Swap Controller (MAX5042)
Integrated Look-Ahead Signal Output Drives High-Speed Optocoupler for Secondary-Side Synchronous Rectification
>90% Efficiency with Synchronous Rectification
Up to 500kHz Switching Frequency
High-Power, Small-Footprint 56-Pin Thermally Enhanced QFN Package

	42V Automotive Power Supplies
	Distributed Power Systems with 48V Bus
	High-Efficiency Telecom/Datacom Power Supplies
	Power-Supply Modules
	Router/Switch Cards with 48V Backplane Power Systems
	Servers with 48V Backplane Power Systems
	xDSL Line Cards
	xDSL Line-Driver Power Supplies

Key Specifications: Isolated Power Supplies

Part Number

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)

Operating Temp. Range (°C)

Price^**

MAX5042

Flyback
Two-Switch Forward

•	Adjustable Frequency

•	High Voltage Start-Up Circuit

•	Internal Error Amplifier

•	Internal Power MOSFET(s)

•	Synchronizable Freqeuncy

•	Synchronous Rectifier Driver

•	Thermal Shutdown

•

UVLO

Voltage Mode

Linear
Opto

600

-40 to +125

$4.95 @ 5k

MAX5043

$4.67 @ 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.