MAX845

PRODUCTION

Isolated Transformer Driver for PCMCIA Applications

Internal Power MOSFETs Save Space and Deliver 750mW

Data Sheet (Rev. 4) Product Selection Table

Part Models: 5
1ku List Price: Starting From $3.05

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Overview

Transformer Driver for Ultra-Thin 5V-µs Transformers
Isolated DC-to-DC Power Supply for PCMCIA Applications
450kHz Minimum Switching Frequency
Ultra-Low Input Supply Current Ripple
Single +5V or +3.3V Supply
5µW Low-Power Shutdown Mode
8-Pin SO and µMAX Packages
Low Output Ripple Permits Miniature Output Capacitors

The MAX845 provides an isolated power supply small enough to fit in thin PCMCIA cards and space-sensitive applications. It drives a low-profile center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated positive or negative voltage at powers up to 750mW.

The MAX845 consists of an oscillator followed by a toggle flip-flop. The flip-flop generates two 50% duty-cycle square waves, which are complementary at half the oscillator frequency (450kHz, min). These two signals drive the ground-referenced N-channel power switches. Internal circuitry ensures break-before-make action between the two switches.

A low-power shutdown disables both the switches and the oscillator, reducing power consumption. An evaluation kit (MAX845EVKIT-MM) is available to evaluate low-profile 5V 40mA and 5V 100mA applications.

Applications

Bridge Ground Differentials
Isolated Data Acquisition
Isolated Interface Power Supply
Low-Power LAN Networks
Medical Equipment
Noise-Immunity Communications Interface
PCMCIA Modem Cards
Process Control

Part Models: 5
1ku List Price: Starting From $3.05

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX845C/D	0-CHIP-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX845ESA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX845ESA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX845EUA+	Micro-MAX, Thin Shrink Small-Outline	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX845EUA+T	Micro-MAX, Thin Shrink Small-Outline	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 30, 2020 - 1702R2 ASSEMBLY
		pcn_1702r2
MAX845ESA+	PRODUCTION
MAX845ESA+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX845

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Features and Benefits

Isolated Power Supply
Low Profile (for PCMCIA cards)

Product Details

The MAX845 evaluation kit (EV kit) is an assembled and tested isolated 5V power supply that meets PCMCIA height requirements. Two demonstration circuits are provided: a 100mA circuit that uses an industry-standard 78L05 regulator, and a 40mA circuit that uses a low-cost zener shunt regulator. Both circuits consist of a MAX845 IC (in the µMAX® package), a low-profile transformer, a half-wave rectified voltage doubler, and a regulator.

Applications

Bridge Ground Differentials
Isolated Data Acquisition
Isolated Interface Power Supply
Low-Power LAN Networks
Medical Equipment
Noise-Immunity Communications Interface
PCMCIA Modem Cards
Process Control

Latest Discussions

2 Years Ago

Overview

Documentation

Data Sheet 1

Reliability Data 1

Design Note 6

Technical Articles 1