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Analog Devices Inc./Maxim Integrated MAX6397VATA+
- Part No.:
- MAX6397VATA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6397VATA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:275
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Product details
Overview
The MAX6397VATA+ from Maxim Integrated is an overvoltage protection controller with integrated 1.8V linear regulator, designed to safeguard downstream loads against input transients up to 72V. It controls an external n-channel MOSFET in either disconnect (switch) or voltage-limit (sawtooth) mode, features a 1.215V adjustable SET threshold, 10V gate-drive enhancement, and delivers up to 100mA from its always-on REG output - used in industrial power rails and wall-cube adapters.
For engineers reviewing the MAX6397VATA+ datasheet, MAX6397VATA+ pinout, MAX6397VATA+ application, or MAX6397VATA+ equivalent, key selection considerations include its 5.5V–72V operating range, thermal shutdown at +150°C, 37µA quiescent current in shutdown, POK assertion at 92.5% or 87.5% of nominal REG, and compatibility with user-selected external MOSFETs for scalable current handling.
Technical Context
The MAX6397VATA+ implements dual-mode overvoltage protection: as a switch (GATE pulled low to disconnect load during IN overvoltage) or as a limiter (GATE sawtoothing to clamp OUT at user-adjusted threshold). Its internal charge pump delivers 75µA gate drive with 10V enhancement above IN or OUT, enabling low RDS(ON) MOSFET operation.
It integrates a fixed 1.8V linear regulator (MAX6397V variant) with 100mA output, 37µA quiescent current, and open-drain POK output asserting at 1.524V–1.625V (92.5% or 87.5% of 1.8V). Undervoltage lockout activates below 4.66V, with 175mV hysteresis, and thermal shutdown disables both REG and GATE above +150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.5V to 72V - supports wide-input industrial and adapter-derived rails without external step-down. |
| REG Output Voltage | 1.8V ±2.5% (MAX6397V) - factory-trimmed, stable for low-voltage microcontrollers or sensors. |
| REG Load Current | Up to 100mA - sufficient for always-on logic, RTC, or supervisory circuits independent of main load state. |
| SET Threshold Voltage | 1.215V ±1.5% - precise reference enabling accurate overvoltage trip points via resistor divider. |
| GATE Drive Enhancement | +10V above IN (≥14V VIN) - ensures full n-MOSFET enhancement for minimal conduction loss. |
| POK Assertion Threshold | 1.524V–1.625V (92.5% or 87.5% of 1.8V) - configurable power-good monitoring with 35µs response. |
| Quiescent Current (SHDN = GND) | 37µA - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood, factory-floor, and high-ambient industrial environments. |
Pinout & Package
MAX6397VATA+ uses an 8-pin 3mm × 3mm thermally enhanced TDFN-EP package with exposed pad (EP) connected to GND. The EP improves thermal dissipation and EMI performance in high-voltage transient environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | High-voltage supply input | Bypass with ≥10µF capacitor; withstands -0.3V to +80V; powers internal circuitry and charge pump. |
| 2 SHDN | Active-low shutdown control | Drives GATE low to disable external MOSFET; REG remains active; internally pulled down (1µA). |
| 3 SET | Overvoltage threshold adjustment | 1.215V comparator input; connects to resistor divider from IN or OUT to set trip point. |
| 4 POK | Open-drain power-good output | Asserts low when REG falls below 92.5%/87.5% of 1.8V; requires external pullup (e.g., 100kΩ to REG). |
| 5 GND | Ground reference | Common return for all analog/digital functions; EP must be soldered to GND plane. |
| 6 GATE | n-MOSFET gate driver output | Charge-pump sourced (75µA); drives gate 10V above IN/OUT; clamped to ≤18V above OUT. |
| 7 OUT | Output voltage sense node | Connects to source of external n-MOSFET; used for feedback in limiter mode or fault detection. |
| 8 REG | 1.8V linear regulator output | Fixed 1.8V, 100mA capable; bypass with ≥4.7µF ceramic capacitor; operates independently of SHDN. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode overvoltage protection | Configurable as fast-disconnect switch or closed-loop voltage limiter with sawtooth GATE waveform. |
| Integrated 1.8V linear regulator | Always-on, 100mA output with 37µA shutdown current - eliminates need for separate low-IQ LDO. |
| Precision SET threshold | 1.215V ±1.5% with 4% hysteresis - enables accurate, temperature-stable overvoltage trip points. |
| Thermal shutdown coordination | +150°C junction shutdown with 20°C hysteresis and shared thermal sensing with external MOSFET. |
| Robust gate drive | 10V enhancement above IN/OUT with internal 18V clamp - prevents n-MOSFET gate oxide damage. |
| Wide-temp industrial qualification | Guaranteed operation from -40°C to +125°C ambient - validated for automotive under-hood and factory automation. |
Applications
| Industrial Power Rails | Wall-Cube Adapter Protection |
|---|---|
Use Scenario: Protecting PLC I/O modules and sensor interfaces from 48V DC bus transients and lightning-induced surges. IC Role / Device Role / Timing Role: Overvoltage protection controller that isolates or limits load voltage using external n-MOSFET, with integrated 1.8V REG powering local logic. Use Value: Enables robust 72V-tolerant front-end design without discrete TVS arrays or secondary regulators - reduces BOM count by two components. |
Use Scenario: Securing USB-C PD or legacy AC/DC wall adapters feeding 1.8V microcontrollers or memory in portable equipment. IC Role / Device Role / Timing Role: Acts as input protector and local 1.8V power source; POK signals system MCU when regulated rail is valid. Use Value: Eliminates need for external reset IC and LDO, while maintaining <37µA shutdown current for battery backup longevity. |
| Notebook System Power Management | FireWire® Interface Protection |
Use Scenario: Safeguarding always-on subsystems (e.g., wake-on-LAN, RTC) during hot-plug of high-voltage auxiliary power sources. IC Role / Device Role / Timing Role: Provides fail-safe 1.8V supply and overvoltage cutoff on main 12V/19V rail; POK enables controlled boot sequencing. Use Value: Ensures reliable wake-up capability even after repeated 60V+ line transients - meets Intel Platform Environment Control Interface (PECI) timing margins. |
Use Scenario: Protecting FireWire PHY and link-layer controllers from cable-induced ESD and hot-swap voltage spikes on +12V/3.3V buses. IC Role / Device Role / Timing Role: Limits transient energy delivered to FireWire transceivers via fast GATE turn-off (<100ns propagation delay). Use Value: Prevents latch-up and data corruption during live insertion; maintains IEEE 1394 compliance without adding series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection with integrated regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6397TATA+ | Fixed 3.3V REG output; same pinout, package, and protection architecture. | Targets 3.3V logic domains (e.g., ARM Cortex-M peripherals), not 1.8V I/O or low-power sensors. | Select when system requires 3.3V always-on rail and higher POK threshold (3.053V nominal). |
| TPS26631RGER | 36V max input, no integrated LDO, 1.2V SET threshold, 2.5A internal FET. | Self-contained hot-swap controller for mid-range current; lacks linear regulator and wide 72V tolerance. | Choose for compact 2.5A single-chip solutions where external 1.8V LDO is already present and input stays ≤36V. |
Compared with MAX6397TATA+ and TPS26631RGER, the MAX6397VATA+ uniquely combines 72V tolerance, 1.8V/100mA always-on regulation, and dual-mode protection in an 8-pin TDFN - making it optimal for space-constrained, ultra-low-power industrial nodes requiring native 1.8V bias.
Availability
MAX6397VATA+ is available at Aetrix Electronics and suitable for industrial power rails, wall-cube adapter protection, and notebook system power management requiring stable component supply across extended temperature and high-voltage transient conditions.
Supply support for MAX6397VATA+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6397 family delivers high-voltage overvoltage protection with integrated linear regulation - engineered specifically for industrial power conditioning, adapter input hardening, and always-on subsystem power in harsh environments.
FAQ
What is the exact REG output voltage tolerance for MAX6397VATA+?
The MAX6397VATA+ provides a factory-trimmed 1.8V linear regulator output with ±2.5% initial accuracy over temperature and load. At IREG = 1mA, VREG is guaranteed 1.76V–1.837V; at 100mA load, it remains within 1.715V–1.837V. This tight tolerance ensures reliable operation of 1.8V I/O standards without external trimming.
How does the MAX6397VATA+ configure overvoltage protection as a limiter versus a switch?
The MAX6397VATA+ selects mode via SET pin connection: tie SET to a resistor divider from OUT for voltage-limiter mode (GATE sawtooths to clamp OUT), or from IN for overvoltage-switch mode (GATE pulls low to disconnect load). Both use the same 1.215V threshold but differ in feedback path and GATE behavior during fault.
Does the MAX6397VATA+ POK output work when SHDN is asserted?
Yes - the POK output remains fully functional regardless of SHDN state because the MAX6397VATA+ linear regulator operates independently of the shutdown logic. When SHDN = GND, REG continues supplying 1.8V and POK asserts low only if VREG drops below its programmed threshold (1.524V–1.625V).
What is the maximum continuous current the external MOSFET can handle with MAX6397VATA+?
The MAX6397VATA+ itself does not limit MOSFET current; it supports user-selected n-channel devices. Designers size the MOSFET based on load current and thermal constraints - e.g., a 5mΩ device delivers ~20A with <2W dissipation at 100°C ambient. The IC's GATE drive (75µA, 10V enhancement) ensures full enhancement for RDS(ON) ≤ 20mΩ.
Can MAX6397VATA+ operate with input voltages below 6.5V?
No - for guaranteed 1.8V REG operation, VIN must exceed VREG + 1.8V = 3.6V, but the datasheet specifies minimum 5.5V for full functionality. Below 5.5V, UVLO disables GATE and REG may drop out; operation below 4.66V (UVLO turn-on threshold) halts all regulation and protection. Use only within 5.5V–72V range.
MAX6397VATA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.575V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (3x3)
MAX6397VATA+ FAQ
1.How can I place an order for MAX6397VATA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6397VATA+ 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 MAX6397VATA+ reliable?
The price and inventory of MAX6397VATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6397VATA+ is usually 5 days.
3.What payment methods are accepted for MAX6397VATA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6397VATA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6397VATA+?
MAX6397VATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6397VATA+ 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 MAX6397VATA+?
For technical support, including MAX6397VATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6397VATA+ requirements.
6.How does Aetrix verify that MAX6397VATA+ is sourced from the original manufacturer or authorized distributors?
All MAX6397VATA+ 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 MAX6397VATA+ meets industry standards.
7.What is the process for return or replacement of MAX6397VATA+?
All MAX6397VATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6397VATA+, 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 MAX6397VATA+ part is unused and in its original packaging.
Return procedure for MAX6397VATA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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