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MAX845
Power Isolated Power MAX845
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MAX845

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Isolated Transformer Driver for PCMCIA Applications

Internal Power MOSFETs Save Space and Deliver 750mW

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Product Details

See parametric specs for Transformer Drivers

Key Features

See parametric specs for Transformer Drivers
Parametric specs for Transformer Drivers
VIN (V) (min) 2.5
VIN (V) (max) 6
Driver Output Resistance (Ω) (max) 4
Max. IOUT (A) 0.2
Topology Push-Pull
Switching Frequency (kHz) 860
IQ (mA) (max) 1.1
Package/Pins SOIC (N)/8
UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes) 		2.48
See parametric specs for Transformer Drivers
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Simplified Block Diagram

Technical Docs

Data Sheet Isolated Transformer Driver for PCMCIA Applications Oct 01, 1997
App Note Bipolar DC-Voltage Detector Offers Sensitivity and Precision
Brochure 36V H-Bridge Transformer Driver Provides Isolated Power for Meters
App Note Isolated Temperature Sensor
App Note Single-Wire Serial Bus Carries Isolated Power and Data
App Note Simple Power-FET Driver is Isolated and DC-Coupled
App Note LAN Power Supply Generates Isolated 9V
App Note Transformer-Driver IC Controls Bidirectional Switch
App Note 5V Step-Down Converter Has Transformer-Isolated Feedback

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for Transformer Drivers
VIN (V) (min) 2.5
VIN (V) (max) 6
Driver Output Resistance (Ω) (max) 4
Max. IOUT (A) 0.2
Topology Push-Pull
Switching Frequency (kHz) 860
IQ (mA) (max) 1.1
Package/Pins SOIC (N)/8
UMAX/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes) 		2.48
See parametric specs for Transformer Drivers

Key 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

Applications/Uses

  • 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

Description

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.

Simplified Block Diagram

MAX845: Typical Operating Circuit MAX845: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Isolated Transformer Driver for PCMCIA Applications Oct 01, 1997
App Note Bipolar DC-Voltage Detector Offers Sensitivity and Precision
Brochure 36V H-Bridge Transformer Driver Provides Isolated Power for Meters
App Note Isolated Temperature Sensor
App Note Single-Wire Serial Bus Carries Isolated Power and Data
App Note Simple Power-FET Driver is Isolated and DC-Coupled
App Note LAN Power Supply Generates Isolated 9V
App Note Transformer-Driver IC Controls Bidirectional Switch
App Note 5V Step-Down Converter Has Transformer-Isolated Feedback

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.