MAX845
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MAX845

Isolated Transformer Driver for PCMCIA Applications

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Internal Power MOSFETs Save Space and Deliver 750mW

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 5
1ku List Price Starting From $3.05
Features
  • 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
Additional Details
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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

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX845C/D
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MAX845ESA+
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MAX845ESA+T
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MAX845EUA+
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MAX845EUA+T
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Product Lifecycle

PCN

Oct 30, 2020

- 1702R2

ASSEMBLY

MAX845ESA+

PRODUCTION

MAX845ESA+T

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Oct 30, 2020

- 1702R2

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ASSEMBLY

MAX845ESA+

PRODUCTION

MAX845ESA+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX845EVKIT

Evaluation Kit for the MAX845

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MAX845EVKIT

Evaluation Kit for the MAX845

Evaluation Kit for the MAX845

Features and Benefits

  • Isolated Power Supply
  • Low Profile (for PCMCIA cards)

Product Detail

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

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