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Analog Devices Inc./Maxim Integrated MAX22256AATB+T
- Part No.:
- MAX22256AATB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX22256AATB+T.pdf
- Description:
- 36V H-BRIDGE TRANSFORMER DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:1,104
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Product details
Overview
MAX22256AATB+T from Analog Devices is a compact 36V H-bridge transformer driver IC for isolated power supplies, delivering up to 650mARMS primary current with 5V–36V input range, 450kHz (typ) internal switching frequency, 30ns fixed dead time, and integrated overcurrent/thermal protection. It drives transformer primaries in PLC field supplies and motor gate drivers.
For engineers reviewing the MAX22256AATB+T datasheet, MAX22256AATB+T pinout, MAX22256AATB+T application, or MAX22256AATB+T equivalent, this page provides verified technical context, real-world design meaning of specifications, package-validated pin functions, and confirmed alternative options for isolated supply designs requiring precise dead time control and robust fault handling.
Technical Context
The MAX22256AATB+T integrates a BiCMOS H-bridge driver with precision 450kHz ±6% internal oscillator, break-before-make logic, and fixed 30ns dead time optimized for conventional H-bridge topologies. It uses resistor-adjustable overcurrent limiting (via ITH pin) and features undervoltage lockout at 4.65V (typ) with 230mV hysteresis.
It operates across -40°C to +125°C, supports internal or external clocking (CLKI), and asserts open-drain FAULT during overtemperature (>160°C) or sustained overcurrent events. Shutdown supply current is 0.7mA (typ), enabling low-power disable mode via EN pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5V to 36V - Enables direct use with industrial 24V rails and wide-input isolated supply designs. |
| Switching Frequency | 450kHz (typ), ±6% - Precision internal clock prevents transformer core saturation from frequency drift. |
| Dead Time | 30ns (typ), fixed - Optimized for conventional H-bridge operation; eliminates cross-conduction risk without external tuning. |
| Output Current Limit | 1.0A (typ), adjustable via RLIM resistor - Allows primary-side current limiting to protect secondary loads and field-side circuitry. |
| Thermal Shutdown | +160°C (typ), 10°C hysteresis - Ensures safe recovery after thermal overload without latch-up or manual reset. |
| Efficiency | Up to 91% - Achieved via low RON (0.52Ω HS / 0.26Ω LS) and optimized dead time, reducing conduction and switching losses. |
| Package | 10-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) - Enables high-density PCB layout for space-constrained isolated supply modules. |
Pinout & Package
MAX22256AATB+T is housed in a thermally enhanced 10-pin TDFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed pad (EP) connected internally to GND. The EP must be soldered to a large ground plane for optimal thermal performance (θJA = 41°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | VDD | Primary power input; requires local 0.1µF + 10µF bypassing to support peak current delivery and noise suppression. |
| 3 | CLKI | Active-low clock input; tied to GND to enable internal 450kHz oscillator; accepts external clock for EMI control and synchronization. |
| 4 | EN | Active-low enable; high state disables ST1/ST2 outputs and reduces supply current to 0.7mA (typ), enabling system-level power gating. |
| 5 | ITH | Overcurrent threshold adjustment; connects to GND via RLIM resistor to set 200–1000mA current limit with ±20% accuracy. |
| 6 | FAULT | Open-drain fault indicator; asserts low during overtemperature or sustained overcurrent (after 2.4ms blanking), supports MCU interrupt-driven diagnostics. |
| 7, 9 | GND | Analog/digital ground reference; both pins must be connected to low-impedance ground plane to ensure stable operation and noise immunity. |
| 8 | ST2 | H-bridge low-side output; delivers up to ±1.1A continuous current to transformer primary; complementary to ST1. |
| 10 | ST1 | H-bridge high-side output; switches with 50% duty cycle and 30ns dead time relative to ST2 to prevent shoot-through. |
| EP | Exposed Pad | Internally connected to GND; mandatory thermal connection to PCB ground plane for junction temperature control below +150°C. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 30ns dead time | Guarantees shoot-through prevention in conventional H-bridge topologies without external timing components or calibration. |
| Resistor-adjustable overcurrent limit | Enables precise primary-side current limiting (200–1000mA) to protect downstream secondary rectifiers and field-side loads. |
| Integrated watchdog timer (32µs) | Automatically recovers from stalled clocks by switching to internal oscillator, preventing transformer DC saturation and overheating. |
| Undervoltage lockout (4.65V typ) | Ensures controlled startup and prevents erratic operation during brown-out conditions on industrial 24V supplies. |
| Low-power disable mode (0.7mA) | Reduces system standby power when isolated supply is inactive, supporting energy-efficient PLC and motor drive architectures. |
Applications
| Isolated Motor Drive Gate Power Supply | Isolated +24V PLC Field Supply |
|---|---|
|
Use Scenario: Providing isolated gate drive power to IGBTs or SiC MOSFETs in servo motor inverters where primary-side control and secondary-side isolation are required. IC Role / Device Role / Timing Role: H-bridge transformer driver generating AC excitation on transformer primary; fixed 30ns dead time ensures safe commutation timing for gate drivers. Use Value: Eliminates need for discrete gate drive transformers and external timing ICs, reducing BOM count and improving reliability in harsh industrial environments. |
Use Scenario: Generating regulated +24V isolated auxiliary power for PLC digital I/O modules, where field-side faults must not disrupt controller-side operation. IC Role / Device Role / Timing Role: Primary-side controller driving transformer with resistor-limited current; FAULT output signals field-side short-circuit events to main PLC CPU. Use Value: Enables indirect secondary load current limiting and fast fault detection (<2.4ms response), protecting both field wiring and controller power domain. |
| Industrial Isolated Sensor Interface Supply | Isolated Communication Transceiver Bias Supply |
|
Use Scenario: Powering isolated analog front-ends (e.g., current/voltage sensors) in factory automation systems where galvanic separation meets IEC 61000-4 immunity requirements. IC Role / Device Role / Timing Role: High-efficiency (up to 91%) transformer driver supplying clean, ripple-free bias to isolated ADCs and signal conditioners. Use Value: Delivers >15W output capability with minimal heat rise in compact 3mm × 3mm footprint, enabling dense sensor node integration. |
Use Scenario: Supplying isolated bias voltage to RS-485 or CAN transceivers in distributed control networks where ground loop elimination is critical. IC Role / Device Role / Timing Role: Compact H-bridge driver powering small ferrite-core transformers; internal 450kHz oscillator minimizes EMI near sensitive data lines. Use Value: Reduces conducted emissions through precise frequency control (±6%), supporting EMC compliance without added filtering components. |
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 |
|---|---|---|---|
| MAX22256BATB+T | 60ns fixed dead time, same package and pinout | Optimized for LLC resonant topology; higher dead time improves ZVS margin but reduces max duty cycle in hard-switched designs | Select MAX22256BATB+T only when zero-voltage switching is required; MAX22256AATB+T remains preferred for standard H-bridge gate drive. |
| MAX22258AUD+T | 14-pin TSSOP-EP, adjustable dead time (29–240ns), adds CLKO output and DTC pin | Supports multi-device synchronization and fine-tuned dead time calibration; larger footprint and different pinout preclude drop-in replacement | Choose MAX22258AUD+T when clock synchronization across multiple isolated supplies or programmable dead time is mandatory; not pin-compatible with MAX22256AATB+T. |
Compared with MAX22256BATB+T and MAX22258AUD+T, the MAX22256AATB+T offers the shortest fixed dead time (30ns) in the smallest package (3mm × 3mm), making it optimal for space-constrained conventional H-bridge designs where simplicity, size, and predictable timing outweigh programmability or LLC optimization needs.
Availability
MAX22256AATB+T is available at Aetrix Electronics and suitable for isolated motor gate drives, PLC field supplies, industrial sensor interfaces, and communication transceiver bias circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX22256AATB+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 power, sensing, and timing solutions.
The MAX22256/MAX22258 product line was designed specifically for compact, high-efficiency isolated DC-DC conversion in industrial automation, offering integrated H-bridge drivers with programmable protection and topology-optimized dead time.
FAQ
What is the maximum continuous output current capability of the MAX22256AATB+T?
The MAX22256AATB+T supports up to ±1.1A continuous current on ST1 and ST2 outputs, with a programmable overcurrent limit ranging from 200mA to 1000mA (typ) set via the RLIM resistor on the ITH pin. This allows primary-side current limiting to protect transformer windings and secondary-side circuitry without requiring additional sensing components.
Does the MAX22256AATB+T support external clock synchronization?
Yes, the MAX22256AATB+T supports external clock synchronization via the CLKI pin. When an external clock signal is applied, the device divides the input frequency by two to generate a 50% duty-cycle switching waveform on ST1/ST2. This enables EMI reduction and phase alignment across multiple isolated supplies, though it lacks the CLKO output found on the MAX22258 variant.
What thermal performance can be expected from the MAX22256AATB+T in a 4-layer PCB design?
In a standard 4-layer PCB with adequate copper pour, the MAX22256AATB+T achieves a junction-to-ambient thermal resistance (θJA) of 41°C/W. With a maximum ambient temperature of +70°C and 1.95W power dissipation, the junction temperature remains within the safe operating limit of +150°C, enabling reliable operation in industrial enclosures without forced airflow.
How does the FAULT output behave during an overcurrent event?
During an overcurrent event exceeding the RLIM-set threshold for longer than the 2.4ms blanking time, the MAX22256AATB+T disables ST1/ST2 and asserts the open-drain FAULT pin low. After a 76ms autoretry interval, it re-enables outputs; if the fault persists, FAULT toggles at ~3% duty cycle, providing diagnostic visibility without latching - a key feature for self-recovering industrial power systems.
Is the MAX22256AATB+T pin-compatible with other variants in the MAX22256 family?
Yes, all MAX22256 variants (A/B/C) share identical 10-pin TDFN-EP packaging and pinout, including MAX22256AATB+T. This allows direct substitution in existing layouts when upgrading dead time (e.g., from 30ns to 60ns or 100ns) without PCB redesign, provided system timing and topology requirements align with the new variant's characteristics.
MAX22256AATB+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)
MAX22256AATB+T FAQ
1.How can I place an order for MAX22256AATB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22256AATB+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 MAX22256AATB+T reliable?
The price and inventory of MAX22256AATB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22256AATB+T is usually 5 days.
3.What payment methods are accepted for MAX22256AATB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22256AATB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22256AATB+T?
MAX22256AATB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22256AATB+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 MAX22256AATB+T?
For technical support, including MAX22256AATB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22256AATB+T requirements.
6.How does Aetrix verify that MAX22256AATB+T is sourced from the original manufacturer or authorized distributors?
All MAX22256AATB+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 MAX22256AATB+T meets industry standards.
7.What is the process for return or replacement of MAX22256AATB+T?
All MAX22256AATB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX22256AATB+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 MAX22256AATB+T part is unused and in its original packaging.
Return procedure for MAX22256AATB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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