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500mA Push-Pull Transformer Driver for Isolated Power Supplies

Simplifies Isolated Power Designs

Product Details

Key Features

Parametric specs for Transformer Drivers
VIN (V) (min) 3
VIN (V) (max) 5.5
Driver Output Resistance (Ω) (max) 0.3
Max. IOUT (A) 0.5
Topology Push-Pull
IQ (mA) (max) 3.5
Package/Pins TDFN-CU/8
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
3.72
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Simplified Block Diagram

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Parameters

Parametric specs for Transformer Drivers
VIN (V) (min) 3
VIN (V) (max) 5.5
Driver Output Resistance (Ω) (max) 0.3
Max. IOUT (A) 0.5
Topology Push-Pull
IQ (mA) (max) 3.5
Package/Pins TDFN-CU/8
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
3.72

Key Features

  • Simple, Flexible Design
    • +3.0V to +5.5V Supply Range
    • Low RON 300mΩ (max) at 4.5V
    • Up to 90% Efficiency
    • Provides Up to 500mA to the Transformer
    • 250kHz or 600kHz Internal Oscillator Frequency
    • -40°C to +125°C Temperature Range
  • Integrated System Protection
    • Undervoltage Lockout
    • Thermal Shutdown
  • Saves Space on Board
    • Small 8-Pin TDFN Package (2mm x 3mm)

Applications/Uses

  • Isolated Analog Front-End
  • Isolated Fieldbus Interface
  • Medical Equipment
  • Power Meter Data Interface

Description

The MAX258 is a 500mA, push-pull transformer driver designed to provide a simple solution for isolated power supplies. The IC has an internal oscillator and operates from a single +3.0V to +5.5V supply. The transformer’s secondary-to-primary winding ratio defines the output voltage, allowing selection of virtually any isolated output voltage with galvanic isolation.

The device features an integrated oscillator driving a pair of n-channel power switches. Internal circuitry guarantees a fixed 50% duty cycle to prevent DC current flow through the transformer.

The IC operates with up to 500mA of continuous current and features undervoltage lockout and thermal shutdown.

The IC includes a low-current shutdown mode to reduce the overall supply current to less than 5µA (max) when the driver is disabled.

The MAX258 is available in a small 8-pin (2mm x 3mm) TDFN package and is specified over the -40°C to +125°C temperature range.

Simplified Block Diagram

MAX258: Typical Operating Circuit MAX258: Typical Operating Circuit Zoom icon

Technical Docs

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.