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Analog Devices Inc./Maxim Integrated MAX22256BATB+T
- Part No.:
- MAX22256BATB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX22256BATB+T.pdf
- Description:
- 36V H-BRIDGE TRANSFORMER DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:3,988
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Product details
Overview
MAX22256BATB+T from Analog Devices is a compact 36V H-bridge transformer driver IC for isolated power supplies, delivering up to 650mARMS primary current with 60ns fixed dead time, 5V–36V supply range, and integrated overcurrent/thermal protection-designed for isolated +24V PLC field supplies and LLC-resonant gate drive applications.
For engineers reviewing the MAX22256BATB+T datasheet, MAX22256BATB+T pinout, MAX22256BATB+T application, or MAX22256BATB+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the MAX22256BATB+T variant.
Technical Context
The MAX22256BATB+T implements a precision 450kHz internal oscillator (±6%) with undervoltage lockout (4.65V typ), break-before-make switching, and fixed 60ns dead time optimized for zero-voltage switching in LLC topologies. It integrates high-side and low-side drivers with 0.52Ω/0.26Ω on-resistances and resistor-adjustable overcurrent limiting (0.9A–1.1A typical).
It features active-low enable (EN), open-drain FAULT output for overtemperature/overcurrent indication, ITH pin for current-limit threshold setting via RLIM, and CLKI input supporting both internal clock operation and external synchronization-while maintaining 50% duty cycle via internal flip-flop logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5V to 36V - supports wide-input industrial DC rails including 24V PLC systems without external regulation. |
| Fixed Dead Time | 60ns (typ) - optimized for LLC resonant converter zero-voltage switching, reducing switching losses and EMI. |
| ST1/ST2 Current Limit | 0.9A to 1.1A (typ at RLIM = 1.2kΩ) - enables indirect secondary-side load current limiting and primary-side fault containment. |
| Switching Frequency | 450kHz (typ, internal clock) - balances transformer size, core loss, and efficiency for >15W isolated supplies. |
| Thermal Shutdown Threshold | +160°C (typ) with 10°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Package | 10-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) - delivers high power density and low θJA (41°C/W on 4-layer board) for space-constrained modules. |
| Efficiency | Up to 91% - achieved via low RON drivers (0.52Ω HS / 0.26Ω LS) and precise timing control minimizing shoot-through and core losses. |
Pinout & Package
MAX22256BATB+T uses a 10-pin TDFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed pad (EP) connected to GND for thermal performance. Pin 1 is ST1, Pin 2 is VDD, Pin 3 is CLKI, Pin 4 is EN, Pin 5 is ITH, Pin 6 is FAULT, Pin 7 is GND, Pin 8 is ST2, Pin 9 is GND, Pin 10 is VDD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ST1 (Pin 1) | H-bridge high-side output | Drives transformer primary leg; rated ±1.1A continuous, 0.52Ω on-resistance minimizes conduction loss. |
| VDD (Pins 2 & 10) | Power supply input | Dual VDD pins reduce IR drop and improve noise immunity; requires local 0.1µF + 10µF bypassing per datasheet layout guidance. |
| CLKI (Pin 3) | External clock input / internal oscillator enable | Pulled low to activate 450kHz internal oscillator; accepts 200–2000kHz external clock for synchronized multi-device operation. |
| EN (Pin 4) | Active-low enable | Drives high to enter 0.7mA shutdown mode; ST1/ST2 go high-impedance, but FAULT remains functional for fault monitoring. |
| ITH (Pin 5) | Overcurrent threshold adjustment | Connects to GND via RLIM resistor (e.g., 1.2kΩ sets ~1A limit); blanking time (2.4ms typ) prevents false tripping during startup transients. |
| FAULT (Pin 6) | Open-drain fault indicator | Asserts low during overcurrent or thermal shutdown; toggles during persistent overcurrent (76ms autoretry cycle) for diagnostic visibility. |
| GND (Pins 7 & 9) | Ground reference | Dual ground pins lower impedance return path; EP must be soldered to large ground plane for thermal dissipation (θJC = 9°C/W). |
| ST2 (Pin 8) | H-bridge low-side output | Complementary output to ST1; 0.26Ω on-resistance ensures balanced drive and minimal conduction loss in H-bridge leg. |
Key Features
| Feature | Design Value |
|---|---|
| 60ns fixed dead time | Prevents cross-conduction in LLC resonant converters, enabling reliable zero-voltage switching and reducing MOSFET stress. |
| Resistor-programmable overcurrent limit | Allows precise primary-side current limiting (200mA–1000mA range) to protect transformer and secondary-side loads without sensing circuitry. |
| Internal 450kHz oscillator (±6%) | Stabilizes switching frequency to prevent transformer core saturation due to drift, eliminating need for external crystal or timing components. |
| Undervoltage lockout (4.65V typ) | Ensures controlled startup and disables outputs if VDD drops below safe operating level, preventing erratic behavior during brownout conditions. |
| Low-power disable mode (0.7mA) | Reduces system standby power in PLC or motor drive applications where isolated supply may be inactive for extended periods. |
Applications
| Isolated Motor Drive Gate Power Supply | Isolated +24V PLC Field Supply |
|---|---|
Use Scenario: Driving gate drivers for IGBTs/MOSFETs in industrial servo drives requiring galvanic isolation between control logic and power stage. IC Role / Device Role / Timing Role: Primary-side H-bridge driver generating AC excitation on transformer primary to produce isolated ±15V gate bias rails. Use Value: 60ns dead time and 650mARMS drive capability enable efficient LLC-based isolation, reducing transformer size while maintaining robust short-circuit protection. |
Use Scenario: Providing regulated +24V field power in programmable logic controllers, isolated from backplane logic to meet IEC 61000-4 immunity requirements. IC Role / Device Role / Timing Role: Transformer driver controlling primary-side energy transfer; FAULT output signals field-side overcurrent to main controller. Use Value: Resistor-adjustable current limit (via ITH) indirectly limits secondary load current, protecting upstream 24V rail during field wiring faults or short circuits. |
| Isolated Auxiliary Power for Industrial Sensors | Isolated Bias Supply for Isolated ADCs/DACs |
Use Scenario: Generating isolated 3.3V/5V bias for analog front-end sensors in hazardous environments (e.g., process automation, explosion-proof enclosures). IC Role / Device Role / Timing Role: Compact transformer driver powering flyback or forward-derived isolated DC/DC stage with tight thermal envelope. Use Value: 3mm × 3mm TDFN package and -40°C to +125°C operation support dense, ruggedized sensor module designs without external heatsinking. |
Use Scenario: Supplying isolated power to precision sigma-delta ADCs or DACs in data acquisition systems requiring >100dB PSRR and no ground-loop coupling. IC Role / Device Role / Timing Role: Primary-side driver enabling transformer-based isolation barrier with low EMI due to fixed 50% duty cycle and precise dead time. Use Value: Internal 450kHz oscillator (±6%) prevents frequency shift-induced core loss variation, ensuring stable bias voltage under temperature and supply fluctuations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar H-bridge transformer driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX22256AATB+T | 30ns fixed dead time (vs. 60ns); same package, supply range, and protection features. | Better suited for conventional hard-switched H-bridge topologies; less optimal for LLC zero-voltage switching. | Select MAX22256AATB+T only when designing non-resonant isolated supplies requiring minimal dead time. |
| MAX22258AUD+T | 14-pin TSSOP-EP package, adjustable dead time (29–240ns), added CLKO output for multi-device sync. | Supports flexible frequency tuning and synchronization across multiple isolated rails; larger footprint and higher pin count. | Choose MAX22258AUD+T when dead time optimization or clock synchronization across multiple isolated supplies is required. |
Compared with MAX22256AATB+T, the MAX22256BATB+T's 60ns dead time improves LLC efficiency and reduces EMI; versus MAX22258AUD+T, it trades programmability and CLKO for smaller size and lower BOM cost in fixed-frequency applications.
Availability
MAX22256BATB+T is available at Aetrix Electronics and suitable for isolated motor drive gate power supplies, PLC field supplies, and industrial sensor auxiliary power applications requiring stable component supply, RoHS compliance, and long-term industrial temperature support (-40°C to +125°C).
Supply support for MAX22256BATB+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.
The MAX22256 family is part of Analog Devices' isolated power interface product line, designed specifically for compact, high-efficiency transformer drivers in industrial automation and programmable logic controller systems.
FAQ
What is the exact dead time of the MAX22256BATB+T and why is it fixed?
The MAX22256BATB+T has a fixed dead time of 60ns (typical), as specified in the ordering information table and confirmed in the Detailed Description section. This value is laser-trimmed during manufacturing and cannot be adjusted externally. It is optimized for zero-voltage switching in LLC resonant converter topologies, where precise, consistent dead time prevents shoot-through while enabling soft switching-critical for achieving >91% efficiency and low EMI in isolated supplies.
Can the MAX22256BATB+T be used with an external clock, and what is the supported frequency range?
Yes, the MAX22256BATB+T supports external clocking via the CLKI pin. The device accepts external clock frequencies from 200kHz to 2000kHz, and internally divides this by two to generate the 50% duty-cycle H-bridge switching signal. When using an external clock, ST1/ST2 operate at half the CLKI frequency-e.g., a 1MHz CLKI input yields 500kHz switching. This enables EMI reduction through spread-spectrum or synchronized multi-rail operation.
How does overcurrent protection work on the MAX22256BATB+T, and what role does the ITH pin play?
The ITH pin on the MAX22256BATB+T sets the overcurrent threshold by connecting an external resistor (RLIM) to GND. For example, a 1.2kΩ resistor configures a ~1A current limit. When ST1/ST2 current exceeds this threshold for longer than the 2.4ms blanking time, the outputs disable and FAULT asserts. After a 76ms autoretry interval, the device re-enables-repeating the cycle if the fault persists. This provides robust, self-recovering protection without external sense amplifiers or controllers.
What is the thermal performance of the MAX22256BATB+T in its TDFN-EP package?
The MAX22256BATB+T in its 3mm × 3mm TDFN-EP package achieves a junction-to-ambient thermal resistance (θJA) of 41°C/W on a four-layer PCB-verified in the Package Information section. Its exposed pad (EP) must be soldered to a large ground plane to realize this rating. Thermal shutdown activates at +160°C (typical) with 10°C hysteresis, allowing safe recovery after transient overloads. This makes the MAX22256BATB+T suitable for high-density industrial modules without forced air cooling.
Does the MAX22256BATB+T support isolated power supplies above 15W, and what limits its output capability?
Yes, the MAX22256BATB+T is rated to provide "over 15W to transformer" per the Product Highlights, and delivers up to 650mARMS primary current from a 5V–36V supply. Its output capability is limited by ST1/ST2 current rating (±1.1A continuous), on-resistance (0.52Ω HS / 0.26Ω LS), thermal dissipation (1951mW max on multilayer board), and transformer design-not by the IC itself. With proper magnetics and layout, designs exceeding 20W have been demonstrated in reference circuits.
MAX22256BATB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Half Bridge
- Applications:
- General Purpose
- Interface:
- Logic
- Load Type:
- Inductive, Capacitive, Resistive
- Technology:
- -
- Rds On (Typ):
- 260mOhm LS, 520mOhm HS
- Current - Output / Channel:
- 1A
- Current - Peak Output:
- 1A
- Voltage - Supply:
- 5V ~ 36V
- Voltage - Load:
- 5V ~ 36V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Fault Protection:
- Over Current, Over Temperature, UVLO
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
MAX22256BATB+T FAQ
1.How can I place an order for MAX22256BATB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22256BATB+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX22256BATB+T reliable?
The price and inventory of MAX22256BATB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22256BATB+T is usually 5 days.
3.What payment methods are accepted for MAX22256BATB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22256BATB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22256BATB+T?
MAX22256BATB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22256BATB+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX22256BATB+T?
For technical support, including MAX22256BATB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22256BATB+T requirements.
6.How does Aetrix verify that MAX22256BATB+T is sourced from the original manufacturer or authorized distributors?
All MAX22256BATB+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX22256BATB+T meets industry standards.
7.What is the process for return or replacement of MAX22256BATB+T?
All MAX22256BATB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX22256BATB+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX22256BATB+T part is unused and in its original packaging.
Return procedure for MAX22256BATB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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