MAX13256
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MAX13256

36V H-Bridge Transformer Driver for Isolated Supplies

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Wide-Range Transformer Driver Simplifies Isolated Power Designs

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Part Models 2
1ku List Price Starting From $3.48
Features
  • Simple, Flexible Design
    • 8V to 36V Supply Range
    • Up to 90% Efficiency
    • Provides Up to 10W to the Transformer
    • Undervoltage Lockout
    • 2.5V to 5V Compatible Logic Interface
    • Internal or External Clock Source
    • Adjustable Overcurrent Threshold
  • Integrated System Protection
    • Fault Detection and Indication
    • Overcurrent Limiting
    • Overtemperature Protection
  • Saves Space on Board
    • Small 10-Pin TDFN Package (3mm x 3mm)
Additional Details
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The MAX13256 H-bridge transformer driver provides a simple solution for making isolated power supplies up to 10W. The device drives a transformer's primary coil with up to 300mA of current from a wide 8V to 36V DC supply. The transformer's secondary-to-primary winding ratio defines the output voltage, allowing selection of virtually any isolated output voltage.

The device features adjustable current limiting, allowing indirect limiting of secondary-side load currents. The current limit of the MAX13256 is set by an external resistor. An active-low FAULT output asserts when the device detects an overtemperature or overcurrent condition. In addition, the device features a low-power mode to reduce the overall supply current to 0.65mA (typ) when the driver is not in use.

The device features an internal oscillator for autonomous operation and an external clock source input to synchronize multiple MAX13256 devices and precisely set the switching frequency. Internal circuitry guarantees a fixed 50% duty cycle to prevent DC current flow through the transformer, regardless of which clock source is used.

The device is available in a small 10-pin (3mm x 3mm) TDFN package and is specified over the -40°C to +125°C automotive temperature range.

Applications

  • 24V PLC Supply Isolation
  • Isolated Fieldbus Interfaces
  • Medical Equipment
  • Motor Controls
  • Power Meters
Part Models 2
1ku List Price Starting From $3.48

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Documentation

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

PCN

Apr 27, 2024

- 2400

ASSEMBLY

MAX13256ATB+

PRODUCTION

MAX13256ATB+T

PRODUCTION

Apr 8, 2022

- 2201

WAFER FAB

MAX13256ATB+

PRODUCTION

MAX13256ATB+T

PRODUCTION

Oct 11, 2013

- 1345

ASSEMBLY

MAX13256ATB+

PRODUCTION

MAX13256ATB+T

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Apr 27, 2024

- 2400

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ASSEMBLY

MAX13256ATB+

PRODUCTION

MAX13256ATB+T

PRODUCTION

Apr 8, 2022

- 2201

arrow down

WAFER FAB

MAX13256ATB+

PRODUCTION

MAX13256ATB+T

PRODUCTION

Oct 11, 2013

- 1345

arrow down

ASSEMBLY

MAX13256ATB+

PRODUCTION

MAX13256ATB+T

PRODUCTION

Software & Part Ecosystem

Evaluation Kits 1

MAX13256EVKIT

Evaluation Kit for the MAX13256

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MAX13256EVKIT

Evaluation Kit for the MAX13256

Evaluation Kit for the MAX13256

Features and Benefits

  • 8V to 36V Input Supply Range
  • Up to 90% Efficiency
  • Full-Wave Rectified Output
  • Configurable for a Voltage Doubler, Bipolar Half-Wave Rectifier, and Push-Pull Rectifier Outputs
  • Internal or External Clock Operation Option
  • Designed for 1500VRMS Isolation
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Detail

The MAX13256 evaluation kit (EV kit) is a fully assembled and tested PCB that contains the MAX13256 10W isolated H-bridge DC-DC converter. The EV kit operates from an 8V to 36V DC power source and the on-board 1:1 turns-ratio transformer from HALO sets the output voltage range from 6.8V to 34.8V with a 300mA current limit.
The EV kit provides greater than 90% overall efficiency at +24V between 2.2W and up to 8.3W output power using an H-bridge DC-DC converter topology. Input-ripple current and radiated noise are minimized by the inherent balanced nature of the design with no interruption in the input current. Undervoltage lockout (UVLO), adjustable current limit, and thermal shutdown provide for a robust 10W isolated supply. The surface-mount transformer provides galvanic isolation with the output powered from a full-wave rectifier circuit, reducing the output-voltage ripple.
The EV kit circuit is configured as a full-wave rectifier, with an output voltage that follows the input voltage but is configurable for other topologies including a voltage doubler, bipolar outputs, half-wave rectification, and a push-pull rectifier.
Use HALO's TGMR-512V6LF transformer for 4:1 turns-ratio operation providing up to 1A load capability.
The device is available in a 10-pin (3mm x 3mm) TDFN package with an exposed pad.

Applications

  • 24V PLC Supply Isolation
  • Isolated Fieldbus Interfaces
  • Medical Equipment
  • Motor Controls
  • Power Meters

Reference Designs 6

MAXREFDES9 System Block Diagram

3.3V to 15V Input, ±15V (±12V) Output, Isolated Power Supply

MAXREFDES177

MAXREFDES177# IO-Link Universal Analog IO

MAXREFDES75

MAXREFDES75#: 24-Bit Weigh Scale with a 16-Bit DAC, 0 to 10V Output

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MAXREFDES75

MAXREFDES75#: 24-Bit Weigh Scale with a 16-Bit DAC, 0 to 10V Output

MAXREFDES75#: 24-Bit Weigh Scale with a 16-Bit DAC, 0 to 10V Output

Features and Benefits

  • Ratiometric measurement or measurement compared to a precision voltage reference
  • User-programmable offset and gain calibration for sensor (load cell)
  • User-programmable offset and gain calibration for DAC
  • User-programmable voltage output range mapping
View Detailed Reference Design external link

Design & Integration Tools

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58.28 M

MAXREFDES1294

Ultra-Miniature, 24V/700mA, No-Opto Isolated Flyback DC-DC Converter with Peak Efficiency of 91.5%, Using the MAX17690

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MAXREFDES1294

Ultra-Miniature, 24V/700mA, No-Opto Isolated Flyback DC-DC Converter with Peak Efficiency of 91.5%, Using the MAX17690

Ultra-Miniature, 24V/700mA, No-Opto Isolated Flyback DC-DC Converter with Peak Efficiency of 91.5%, Using the MAX17690

Features and Benefits

  • Undervoltage Lockout
  • 2.5V to 5V Compatible Logic Interface
  • Internal or External Clock Source
  • Adjustable Overcurrent Threshold
  • Fault Detection and Indication
  • Overcurrent Limiting
  • Overtemperature Protection
  • Small 10-Pin TDFN Package (3mm × 3mm)
View Detailed Reference Design external link

Part Used 1

Design & Integration Tools

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1.3 M

maxrefdes12fig01

Isolated Industrial Octal Digital Input Translator/Serializer

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MAXREFDES12

Isolated Industrial Octal Digital Input Translator/Serializer

Isolated Industrial Octal Digital Input Translator/Serializer

Features and Benefits

Features

  • Eight high-voltage input channels (36V, max)
  • On-chip 8-to-1 serialization with SPI interface
  • On-chip 5V regulator
  • Isolated power and data
  • Small printed circuit board (PCB) area
  • Device drivers
  • Example C source code
  • Pmod™-compatible form factor

Applications

  • Building automation
  • Digital input modules for PLCs
  • Industrial automation
  • Motor control
  • Process automation

View Detailed Reference Design external link

Design & Integration Tools

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47.02 M

MAXREFDES74

MAXREFDES74: 18-Bit Precision Data Acquisition System

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MAXREFDES74

MAXREFDES74: 18-Bit Precision Data Acquisition System

MAXREFDES74: 18-Bit Precision Data Acquisition System

Features and Benefits

The MAXREFDES74# reference design features:

  • Power and data isolation
  • Flexible, configurable inverting or noninverting input scheme
  • Unipolar or bipolar input (ADC) and output (DAC)

MAX11156

  • 18-bit resolution with no missing codes
  • SNR: 94.4dB
  • THD: -107dB at 1kHz
  • Buffered internal or external voltage reference input
  • Internal reference with -6ppm/°C (typ) temperature coefficient
  • Single 5V supply
  • True bipolar ±5V input range

MAX5318

  • 18-bit resolution with no missing codes
  • High accuracy: ±2 LSB INL (max)
  • 3µs settling time
  • User-programmable offset and gain calibration
  • ±0.5ppm/°C (typ) offset and gain drift over temperature
  • Force/sense output
  • 50MHz SPI-compatible interface with 1.8V to 5.5V logic
View Detailed Reference Design external link

Design & Integration Tools

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6.42 M

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