Maxim
/
Products
/
Power
/
Isolated Power
/
MAX253
Power Isolated Power MAX253
Top

MAX253

Download

1W Primary-Side Transformer H-Bridge Driver for Isolated Supplies

Printable Data Sheet Subscribe

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) 350
IQ (mA) (max) 0.45
Package/Pins CDIP/8
PDIP/8
SOIC (N)/8
UMAX/8
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Budgetary
Price (See Notes) 		1.78
See parametric specs for Transformer Drivers
View Less

Simplified Block Diagram

Technical Docs

Data Sheet 1W Primary-Side Transformer H-Bridge Driver for Isolated Supplies Apr 23, 2015
App Note Push-Pull Driver Provides Isolated 5V at 1A
App Note Set Your Holiday Lights to Music
Brochure 36V H-Bridge Transformer Driver Provides Isolated Power for Meters
App Note RS-485 Data Interface Gives Isolated, Full-Duplex Operation
App Note Draw 150mW of Isolated Power from Off-Hook Phone Line
Tutorial Choose the Right Ultra-Thin DC-DC Converter for a Compact PCMCIA Card
Tutorial Oops...Practical ESD Protection vs. Foolhardy Placebos
Tutorial Reduce the Chances of Human Error: Part 2, Super Amps and Filters for Analog Interface
Tutorial Reduce the Chances of Human Error: Part 1, Power and Ground
Tutorial Practical Aspects of EMI Protection

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) 350
IQ (mA) (max) 0.45
Package/Pins CDIP/8
PDIP/8
SOIC (N)/8
UMAX/8
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Budgetary
Price (See Notes) 		1.78
See parametric specs for Transformer Drivers

Key Features

  • Simple Power-Supply Transformer Driver Design for Isolated RS-485/RS-232 Data-Interface Applications
    • Single 5V or 3.3V Supply
    • Low-Current Shutdown Mode: 0.4µA
    • Pin-Selectable Frequency: 350kHz or 200kHz
  • 8-Pin DIP, SO, and µMAX® Packages Take Minimal Board Space

Applications/Uses

  • Bridge Ground Differentials
  • High Noise-Immunity Communications Interface
  • Isolated and/or High-Voltage Power Supplies
  • Isolated RS-485/RS-232 Power Supply
  • Medical Equipment
  • Process Control
  • Transformer Driver

Description

The MAX253 monolithic oscillator/power-driver is specifically designed to provide isolated power for an isolated RS-485 or RS-232 data interface. The device drives a center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated voltage needed at power levels up to 1W.

The MAX253 consists of a CMOS oscillator driving a pair of N-channel power switches. The oscillator runs at double the output frequency, driving a toggle flip-flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break-before-make action between the two switches.

The SD pin puts the entire device into a low-power shutdown state, disabling both the power switches and oscillator.

Simplified Block Diagram

MAX253: Typical Operating Circuit MAX253: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet 1W Primary-Side Transformer H-Bridge Driver for Isolated Supplies Apr 23, 2015
App Note Push-Pull Driver Provides Isolated 5V at 1A
App Note Set Your Holiday Lights to Music
Brochure 36V H-Bridge Transformer Driver Provides Isolated Power for Meters
App Note RS-485 Data Interface Gives Isolated, Full-Duplex Operation
App Note Draw 150mW of Isolated Power from Off-Hook Phone Line
Tutorial Choose the Right Ultra-Thin DC-DC Converter for a Compact PCMCIA Card
Tutorial Oops...Practical ESD Protection vs. Foolhardy Placebos
Tutorial Reduce the Chances of Human Error: Part 2, Super Amps and Filters for Analog Interface
Tutorial Reduce the Chances of Human Error: Part 1, Power and Ground
Tutorial Practical Aspects of EMI Protection

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.