MAX22256
MAX22256
RECOMMENDED FOR NEW DESIGNSCompact, 36V H-Bridge Transformer Driver for Isolated Supplies
Wide-Range Transformer Driver Simplifies Isolated Power Designs
- Part Models
- 6
- 1ku List Price
- Starting From $4.29
Viewing:
Overview
- Simple, Flexible Design
- 5V to 36V Supply Range
- Up to 91% Efficiency
- Provides over 15W to Transformer
- Undervoltage Lockout
- Internal or External Clock Source
- Synchronous Clock Output (MAX22258)
- Programmable Overcurrent Threshold
- 30ns to 200ns Adjustable Deadtime (MAX22258)
- Robust Integrated System Protection
- Fault Detection and Indication
- Overcurrent Limiting up to 1A
- Overtemperature Protection
- Precision Internal Clock Source (±6%) Prevents Excessive Transformer Core Losses Due to Frequency Shift
- Wide Temperature Range: -40°C to +125°C
- Space Savings
- Small 3mm x 3mm 10-Pin TDFN Package (MAX22256A/B/C) with 0.5mm Pitch
- Small 4mm x 5mm 14-Pin TSSOP Package (MAX22258) with 0.65mm Pitch
The MAX22256/MAX22258 integrated primary-side controllers and H-bridge drivers for isolated power-supply circuits feature a precision on-board oscillator, protection circuitry, and internal MOSFETs to provide up to 650mARMS of current to the primary winding of a transformer. These devices feature an internal 450kHz (typ) oscillator and can also be driven by an external clock to synchronize multiple devices and control EMI. An internal flip-flop stage guarantees a fixed 50% duty-cycle to prevent DC current flow in the transformer as long as the clock period is constant.
The MAX22256/MAX22258 operate from a wide single-supply voltage range from 5V to 36V and include undervoltage lockout for controlled startup. Break-before-make switching is integrated to prevent cross-conduction of the H-bridge MOSFETs. A resistor-adjustable overcurrent limit allows primary-side limiting of load currents on the transformer’s secondary side and thermal shutdown circuitry provides additional protection against excessive power dissipation.
The MAX22256A features a 30ns (typ) dead time for conventional H-bridge switching topologies. The MAX22256B/C feature a fixed dead time of 60ns (typ) and 100ns (typ), respectively, and are optimized for the zero-voltage switching of an LLC topology. The MAX22258 features a resistor-programmable dead time and a synchronized clock output (CLKO).
Applications
- Isolated Motor Drive Gate Power Supply
- Isolated +24V PLC Field Supply
Documentation
Data Sheet 1
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 |
|---|---|---|---|
| MAX22256AATB+ | 10-Lead TDFN (3mm x 3mm x 0.75mm) | ||
| MAX22256AATB+T | 10-Lead TDFN (3mm x 3mm x 0.75mm) | ||
| MAX22256BATB+ | 10-Lead TDFN (3mm x 3mm x 0.75mm) | ||
| MAX22256BATB+T | 10-Lead TDFN (3mm x 3mm x 0.75mm) | ||
| MAX22256CATB+ | 10-Lead TDFN (3mm x 3mm x 0.75mm) | ||
| MAX22256CATB+T | 10-Lead TDFN (3mm x 3mm x 0.75mm) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareTools & Simulations
LTspice
Models for the following parts are available in LTspice:
- MAX22256
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
Evaluation Kit for the MAX22258
Resources
Evaluation Kit for the MAX22256