Features and Benefits
- 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
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.
- 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
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX253 Reliability Data1/12/2023
Reduce the Chances of Human Error: Part 1, Power and Ground3/8/2011
Reduce the Chances of Human Error: Part 2, Super Amps and Filters for Analog Interface3/8/2011
Oops...Practical ESD Protection vs. Foolhardy Placebos3/2/2011
Practical Aspects of EMI Protection8/21/2002
Choose the Right Ultra-Thin DC-DC Converter for a Compact PCMCIA Card1/31/2001
Tools & Simulations
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Sample & Buy
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Buy Now Pricing
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