MAX253
MAX253
PRODUCTION1W Primary-Side Transformer H-Bridge Driver for Isolated Supplies
- Part Models
- 14
- 1ku List Price
- Starting From $2.71
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Overview
- 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.
Applications
- 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
Documentation
Data Sheet 1
Design Note 4
Technical Articles 5
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 |
|---|---|---|---|
| MAX253CPA+ | Plastic Dual-In-Line, Narrow (0.3in) | ||
| MAX253CSA+ | Small-Outline IC Narrow (0.15in) | ||
| MAX253CSA+T | Small-Outline IC Narrow (0.15in) | ||
| MAX253CUA+ | Micro-MAX, Thin Shrink Small-Outline | ||
| MAX253CUA+T | Micro-MAX, Thin Shrink Small-Outline | ||
| MAX253EPA+ | Plastic Dual-In-Line, Narrow (0.3in) | ||
| MAX253ESA+ | Small-Outline IC Narrow (0.15in) | ||
| MAX253ESA+T | Small-Outline IC Narrow (0.15in) | ||
| MAX253ESA/V+ | Small-Outline IC Narrow (0.15in) | ||
| MAX253ESA/V+T | Small-Outline IC Narrow (0.15in) | ||
| MAX253EUA+ | Micro-MAX, Thin Shrink Small-Outline | ||
| MAX253EUA+T | Micro-MAX, Thin Shrink Small-Outline | ||
| MAX253MJA | Ceramic Dual-In-Line, Narrow (0.3in) | ||
| MAX253MSA/PR+ | Small-Outline IC Narrow (0.15in) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 14, 2019 - 1702D ASSEMBLY |
||
| MAX253CSA+ | PRODUCTION | |
| MAX253CSA+T | PRODUCTION | |
|
Apr 20, 2026 - 2571A PIN/ERRATA |
||
| MAX253CSA+T | PRODUCTION | |
| MAX253ESA+T | PRODUCTION | |
|
May 1, 2020 - 1753R ASSEMBLY |
||
| MAX253CUA+ | PRODUCTION | |
| MAX253CUA+T | PRODUCTION | |
|
Apr 20, 2026 - 2571B PIN/ERRATA |
||
| MAX253CUA+T | PRODUCTION | |
| MAX253EUA+T | PRODUCTION | |
|
Aug 28, 2018 - 1702A ASSEMBLY |
||
| MAX253ESA+ | PRODUCTION | |
| MAX253ESA+T | PRODUCTION | |
|
Sep 19, 2018 - 1753N ASSEMBLY |
||
| MAX253EUA+ | PRODUCTION | |
| MAX253EUA+T | PRODUCTION | |
|
Oct 30, 2020 - 1702R2 ASSEMBLY |
||
| MAX253MSA/PR+ | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.