MAX258
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MAX258

500mA Push-Pull Transformer Driver for Isolated Power Supplies

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Simplifies Isolated Power Designs

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Part Details
Part Models 2
1ku List Price Starting From $3.72
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)
Additional Details
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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.

Applications

  • Isolated Analog Front-End
  • Isolated Fieldbus Interface
  • Medical Equipment
  • Power Meter Data Interface
Part Models 2
1ku List Price Starting From $3.72

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX258ATA+
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Product Lifecycle

PCN

Oct 23, 2013

- 1345_AMENDED

ASSEMBLY

MAX258ATA+

PRODUCTION

MAX258ATA+T

PRODUCTION

Oct 11, 2013

- 1345

ASSEMBLY

MAX258ATA+

PRODUCTION

MAX258ATA+T

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Oct 23, 2013

- 1345_AMENDED

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ASSEMBLY

MAX258ATA+

PRODUCTION

MAX258ATA+T

PRODUCTION

Oct 11, 2013

- 1345

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ASSEMBLY

MAX258ATA+

PRODUCTION

MAX258ATA+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX258EVKIT

Evaluation Kit for the MAX258

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MAX258EVKIT

Evaluation Kit for the MAX258

Evaluation Kit for the MAX258

Features and Benefits

  • 3.0V to 5.5V Operating Voltage Range
  • Up to 90% Efficiency
  • Push-Pull Rectified Output
  • Configurable Bipolar Outputs or Full-Wave Rectifier
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Detail

The MAX258 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the MAX258 push-pull transformer driver. The EV kit operates from a single 3.0V to 5.5V supply and the on-board 1CT:1.3CT turns-ratio transformer sets the output voltage.
The EV kit provides up to 90% overall efficiency at 5V with up to 2.3W output power using a push-pull isolated DC-DC converter. Undervoltage lockout and thermal shutdown provide for a robust isolated supply. The surface-mount transformer provides galvanic isolation with the output powered from a push-pull rectifier circuit, reducing the output-voltage ripple.
The EV kit circuit is configured as a push-pull rectifier, with an output voltage that follows the input voltage. The EV kit is also configurable for other topologies including bipolar outputs and full-wave rectification.

Applications

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

Tools & Simulations 1

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