My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX22256CATB+T
- Part No.:
- MAX22256CATB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX22256CATB+T.pdf
- Description:
- 36V H-BRIDGE TRANSFORMER DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:3,614
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX22256CATB+T from Analog Devices is a compact 36V H-bridge transformer driver IC for isolated power supplies, delivering up to 650mARMS primary current with fixed 100ns dead time, 450kHz internal oscillator (±6%), and resistor-adjustable overcurrent limit (0.9–1.1A). It operates across 5V–36V supply range and supports LLC resonant topology in industrial motor drive gate supplies.
For engineers reviewing the MAX22256CATB+T datasheet, MAX22256CATB+T pinout, MAX22256CATB+T application, or MAX22256CATB+T equivalent, key selection criteria include fixed 100ns dead time for zero-voltage switching, TDFN-EP 3mm×3mm 10-pin package thermal performance (θJA = 41°C/W on 4-layer board), and integrated protection including undervoltage lockout (4.65V typ), thermal shutdown (+160°C), and fault-indicating open-drain output.
Technical Context
The MAX22256CATB+T integrates dual N-channel MOSFET drivers with precision 450kHz internal oscillator and break-before-make logic to enforce 50% duty cycle and prevent transformer core saturation. Its fixed 100ns dead time is optimized for LLC resonant topologies, reducing switching noise and improving efficiency beyond conventional H-bridge operation.
It features resistor-programmable overcurrent limiting via ITH pin (RLIM sets 0.9–1.1A threshold), 2.4ms blanking time before fault assertion, and 76ms autoretry cycle. The device supports both internal clock operation and external synchronization via CLKI input, with watchdog timeout (32µs typ) ensuring fail-safe switching during clock failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5V to 36V - Enables direct integration into wide-input industrial DC bus systems without pre-regulation. |
| Internal Oscillator Frequency | 450kHz ±6% - Precision timing prevents excessive transformer core losses from frequency drift. |
| Fixed Dead Time | 100ns (typ) - Optimized for zero-voltage switching in LLC resonant converters to reduce EMI and conduction loss. |
| ST1/ST2 Current Limit | 0.9A to 1.1A (set by RLIM) - Primary-side current limiting protects secondary-side loads and upstream supply during field faults. |
| Thermal Shutdown Threshold | +160°C (typ) with 10°C hysteresis - Ensures robust operation under sustained high-power conditions in enclosed enclosures. |
| Package Thermal Resistance (θJA) | 41°C/W (4-layer board) - Supports >15W isolated power delivery with minimal heatsinking in space-constrained designs. |
| Operating Temperature Range | -40°C to +125°C - Qualified for use in industrial PLCs, motor drives, and harsh-environment automation equipment. |
Pinout & Package
MAX22256CATB+T is housed in a 3mm × 3mm, 10-pin TDFN-EP package with exposed pad (EP) for enhanced thermal dissipation. The package is RoHS-compliant and designed for surface-mount reflow assembly on multilayer PCBs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | VDD | Primary power input (5V–36V); requires local 0.1µF + 10µF bypassing to minimize switching noise coupling. |
| 3 | CLKI | Active-low clock input - tied to GND to enable internal 450kHz oscillator; accepts external clock up to 2MHz for synchronized multi-device operation. |
| 4 | EN | Active-low enable - high disables ST1/ST2 outputs (0.7mA shutdown current), preserving system-level power sequencing control. |
| 5 | ITH | Overcurrent threshold adjustment - connects to GND via RLIM resistor (e.g., 1.2kΩ sets ~1A limit) with ≤10pF capacitance for stable current sensing. |
| 6 | FAULT | Open-drain fault indicator - asserts low during overcurrent or thermal shutdown; requires external pull-up for microcontroller interrupt detection. |
| 7, 9 | GND | Dual ground connections - provide low-impedance return paths for power and logic domains; must connect to common ground plane. |
| 8 | ST2 | H-bridge low-side output - drives transformer primary winding with ±1.1A continuous capability and 0.26Ω typical ROL. |
| 10 | ST1 | H-bridge high-side output - complements ST2 with 0.52Ω typical ROH; forms push-pull pair for transformer excitation. |
| EP | Exposed Pad | Internally connected to GND - must be soldered to large copper pour for thermal management (θJC = 9°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| LLC-optimized 100ns dead time | Enables zero-voltage switching in resonant converters, reducing EMI and improving efficiency over conventional H-bridge drivers. |
| Resistor-programmable overcurrent limit | Allows precise primary-side current limiting (0.2A–1.1A) to protect secondary-side loads and isolate field-side failures from main supply. |
| Integrated watchdog timer (32µs) | Prevents transformer saturation and overheating if external clock fails - automatically reverts to internal 450kHz oscillator. |
| Undervoltage lockout (4.65V typ) | Ensures controlled startup and prevents erratic operation during brownout conditions or unstable power rail ramp-up. |
| Low-power disable mode (0.7mA) | Reduces system standby power when gate drive is inactive, supporting energy-efficient PLC and motor control architectures. |
Applications
| Isolated Motor Drive Gate Power Supply | Isolated +24V PLC Field Supply |
|---|---|
|
Use Scenario: Providing isolated gate drive power for IGBTs or SiC MOSFETs in servo drives and variable-frequency inverters. IC Role / Device Role / Timing Role: Primary-side H-bridge driver generating AC excitation for center-tapped transformer feeding secondary-side rectifiers and LDOs. Use Value: 100ns dead time enables soft-switching in LLC topology, achieving >91% efficiency and reducing EMI filtering requirements in compact drive modules. |
Use Scenario: Delivering regulated +24V to field I/O modules in programmable logic controllers with galvanic isolation from backplane. IC Role / Device Role / Timing Role: Transformer primary driver enabling compact, high-efficiency isolated DC-DC conversion without optocouplers or secondary-side feedback. Use Value: Resistor-adjustable overcurrent threshold (via ITH) limits secondary load current indirectly, protecting field wiring and sensors during short-circuit events. |
| Industrial Isolated Sensor Bias Supply | Isolated Communication Interface Power |
|
Use Scenario: Generating isolated ±15V bias rails for analog signal conditioning circuits in process instrumentation transmitters. IC Role / Device Role / Timing Role: High-frequency transformer driver operating at 450kHz to support small magnetic components and tight layout constraints. Use Value: Precision internal oscillator (±6%) minimizes transformer core loss variation across temperature, ensuring stable bias voltage under thermal cycling. |
Use Scenario: Powering isolated RS-485 or CAN transceivers in factory automation networks requiring reinforced insulation. IC Role / Device Role / Timing Role: Compact isolated supply generator driving transformer primary with 650mARMS current to sustain >15W output at full load. Use Value: Fault output (FAULT pin) provides real-time indication of overtemperature or overcurrent, enabling host MCU to initiate safe shutdown or diagnostics. |
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 | Fixed 60ns dead time (vs. 100ns); identical package, pinout, and feature set otherwise. | Better suited for conventional hard-switched H-bridge topologies where shorter dead time maximizes duty cycle utilization. | Select MAX22256BATB+T when designing non-resonant isolated supplies or when minimizing minimum on-time is critical. |
| MAX22258AUD+T | 14-pin TSSOP-EP package with adjustable dead time (29–240ns) and synchronous CLKO output - not pin-compatible. | Required for multi-device synchronization or fine-tuned dead time optimization in high-EMI-sensitive environments. | Choose MAX22258AUD+T only when CLKO synchronization or programmable dead time justifies larger footprint and redesign effort. |
Compared with MAX22256BATB+T and MAX22258AUD+T, the MAX22256CATB+T delivers optimal trade-off between LLC topology efficiency and compact 3mm×3mm footprint - its 100ns dead time specifically targets zero-voltage switching performance without requiring layout changes or additional synchronization circuitry.
Availability
MAX22256CATB+T is available at Aetrix Electronics and suitable for isolated motor drive gate supplies, PLC field power, industrial sensor bias rails, and isolated communication interface power requiring stable component supply across extended temperature ranges.
Supply support for MAX22256CATB+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 since 1965.
The MAX22256/MAX22258 family was developed to simplify isolated power supply design in space-constrained industrial systems, replacing discrete MOSFET drivers and timing ICs with a single-chip solution featuring integrated protection and topology-optimized dead time.
FAQ
What is the dead time configuration of MAX22256CATB+T?
The MAX22256CATB+T features a fixed 100ns (typical) dead time, optimized for zero-voltage switching in LLC resonant converter topologies. This value is factory-trimmed and not adjustable - unlike the MAX22258, it lacks DTC pin or external resistor programming. The 100ns setting balances reduced cross-conduction risk with sufficient on-time for high-efficiency operation at 450kHz, and is confirmed in the Ordering Information table and Electrical Characteristics section of the datasheet.
Does MAX22256CATB+T support external clock synchronization?
Yes, MAX22256CATB+T supports external clock synchronization via the CLKI pin. When an external clock signal (200kHz–2MHz) is applied, the device divides it by two internally to generate complementary 50% duty-cycle outputs on ST1 and ST2. The internal 450kHz oscillator is disabled during external clock operation. This capability allows precise EMI control and multi-device phase alignment in modular power systems - verified in the "Internal Oscillator and External Clock" section of the datasheet.
How is overcurrent protection implemented in MAX22256CATB+T?
MAX22256CATB+T implements overcurrent protection using a resistor-connected ITH pin to set a precise current limit (0.9–1.1A typical) for ST1/ST2 outputs. Upon exceeding the threshold for longer than 2.4ms (blanking time), the driver disables outputs and asserts the open-drain FAULT pin. After 76ms autoretry delay, it attempts recovery - repeating until fault clears. This behavior is documented in the "Overcurrent Limiting" and "FAULT Output" sections, with electrical specs confirming ±1µA input leakage and 10µA fault leakage.
What thermal performance can be expected from MAX22256CATB+T in a 4-layer PCB?
On a standard 4-layer PCB, MAX22256CATB+T achieves a junction-to-ambient thermal resistance (θJA) of 41°C/W and junction-to-case (θJC) of 9°C/W, as specified in the Package Information table. This enables reliable operation at full 15W+ output power with minimal external heatsinking - validated by thermal characterization per JEDEC JESD51-7. The exposed pad (EP) must be soldered to a ≥100mm² internal ground plane to realize these values, per land pattern number 90-0003.
Is MAX22256CATB+T pin-compatible with other variants in the MAX22256 family?
Yes, MAX22256CATB+T is fully pin-compatible with MAX22256AATB+T and MAX22256BATB+T - all share identical 10-pin TDFN-EP (3mm×3mm) package, pinout, and electrical interface. Differences are limited to internal dead time (30ns/60ns/100ns) and minor parameter tolerances; no PCB layout change is required when substituting within the MAX22256 series. This compatibility is explicitly confirmed in the Pin Configurations, Ordering Information, and Package Information sections of the datasheet.
MAX22256CATB+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)
MAX22256CATB+T FAQ
1.How can I place an order for MAX22256CATB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX22256CATB+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 MAX22256CATB+T reliable?
The price and inventory of MAX22256CATB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX22256CATB+T is usually 5 days.
3.What payment methods are accepted for MAX22256CATB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX22256CATB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX22256CATB+T?
MAX22256CATB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX22256CATB+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 MAX22256CATB+T?
For technical support, including MAX22256CATB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX22256CATB+T requirements.
6.How does Aetrix verify that MAX22256CATB+T is sourced from the original manufacturer or authorized distributors?
All MAX22256CATB+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 MAX22256CATB+T meets industry standards.
7.What is the process for return or replacement of MAX22256CATB+T?
All MAX22256CATB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX22256CATB+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 MAX22256CATB+T part is unused and in its original packaging.
Return procedure for MAX22256CATB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX22256CATB+T Tags
-
NCP1393BDR2G
onsemi
-
A3909GLNTR-T
Allegro MicroSystems
-
NCP51530BDR2G
onsemi
-
A3909GLYTR-T
Allegro MicroSystems
-
SIC631CD-T1-GE3
Vishay Siliconix
-
BTN70301EPAXUMA1
Infineon Technologies
-
TDA21520AUMA1
Infineon Technologies
-
AOZ5116QI
Alpha & Omega Semiconductor Inc.
-
IRSM005-301MHTR
Infineon Technologies
-
IRSM005-301MH
Infineon Technologies
-
MP6610GJ-Z
Monolithic Power Systems Inc.
-
DRV8908QPWPRQ1
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
