MAX258

PRODUCTION

500mA Push-Pull Transformer Driver for Isolated Power Supplies

Simplifies Isolated Power Designs

Data Sheet (Rev. 1) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.72

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Overview

Simple, Flexible Design
- +3.0V to +5.5V Supply Range
- Low R_ON 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)

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

Documentation

Data Sheet 1

MAX258: 500mA Push-Pull Transformer Driver for Isolated Power Supplies Data Sheet (Rev.1) 10/16/2018

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
MAX258ATA+	8-LFCSP-2X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX258ATA+T	8-LFCSP-2X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 23, 2013 - 1345_AMENDED ASSEMBLY
		pcn_1345_amended
MAX258ATA+	PRODUCTION
MAX258ATA+T	PRODUCTION
Oct 11, 2013 - 1345 ASSEMBLY
		pcn_1345
MAX258ATA+	PRODUCTION
MAX258ATA+T	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
MOSFET & Gate Drivers 5
MAX845	PRODUCTION	Isolated Transformer Driver for PCMCIA Applications
MAX13256	PRODUCTION	36V H-Bridge Transformer Driver for Isolated Supplies
MAX256	PRODUCTION	3W Primary-Side Transformer H-Bridge Driver for Isolated Supplies
MAX253	PRODUCTION	1W Primary-Side Transformer H-Bridge Driver for Isolated Supplies

MAX13253

PRODUCTION

1A Spread-Spectrum Push-Pull Transformer Driver for Isolated Power Supplies

Tools & Simulations

IBIS Model 1

MAX258 IBIS Model

Evaluation Kits

Evaluation Kit for the MAX258

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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 Details

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.