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Analog Devices Inc./Maxim Integrated MAX6397WATA+
- Part No.:
- MAX6397WATA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6397WATA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,936
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Product details
Overview
MAX6397WATA+ from Maxim Integrated is a high-voltage overvoltage protection controller with integrated 1.8V linear regulator and open-drain POK output. It monitors input/output voltage via the SET pin, controls an external n-channel MOSFET through the GATE driver, and delivers up to 100mA regulated output while consuming only 37µA quiescent current. It operates across 5.5V–72V input range and supports both overvoltage switch and limiter modes for industrial power-rail protection.
For engineers reviewing the MAX6397WATA+ datasheet, MAX6397WATA+ pinout, MAX6397WATA+ application, or MAX6397WATA+ equivalent, this device is selected for high-reliability DC power conditioning where transient survivability, low-quiescent-current always-on regulation, and configurable overvoltage response (disconnect vs. clamping) are critical design requirements.
Technical Context
The MAX6397WATA+ implements dual-function protection: as an overvoltage switch, it pulls GATE low to disconnect load when IN exceeds user-adjustable threshold; as a limiter, it drives GATE in sawtooth mode to regulate OUT at the threshold. Its internal charge pump delivers ≥10V gate-to-source drive above IN or OUT to fully enhance external n-MOSFETs with low RDS(ON).
It integrates a fixed 1.8V linear regulator (MAX6397W variant) with 92.5% POK threshold, thermal shutdown at +150°C (20°C hysteresis), and UVLO activation at 5.0V (typ). The SET pin features 1.215V ±0.034V threshold with 4% hysteresis, enabling precise overvoltage trip setting via resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 72V - supports wide industrial DC rails including 24V/48V systems and automotive battery transients. |
| Regulator Output Voltage | 1.8V (factory-set, MAX6397W) - powers low-voltage logic, microcontrollers, or sensors without external LDO. |
| Regulator Output Current | Up to 100mA - sufficient for always-on MCU cores, RTCs, or supervisory circuits. |
| Quiescent Current | 37µA (SHDN = GND) - enables ultra-low-power operation in battery-backed or energy-harvesting systems. |
| Overvoltage Threshold Accuracy | 1.215V ±0.034V at SET pin - allows <±1% threshold setting error with standard 1% resistors. |
| GATE Drive Capability | Charge-pump output ≥10V above IN or OUT - ensures full enhancement of n-MOSFETs with VGS(th) up to 4V. |
| POK Assertion Threshold | 1.653V (92.5% of 1.8V nominal) - provides early warning of regulator droop before functional failure. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood, factory automation, and harsh-environment deployment. |
Pinout & Package
MAX6397WATA+ is housed in an 8-pin, 3mm × 3mm thermally enhanced TDFN-EP package with exposed pad (EP) connected to GND for improved thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | High-voltage supply input | Bypassed with ≥10µF capacitor; withstands up to +80V transient; powers internal circuitry and charge pump. |
| 2 SHDN | Active-low shutdown control | Drives GATE low to disable external MOSFET; REG remains active - enables selective load isolation without losing bias. |
| 3 SET | Overvoltage threshold reference input | Accepts resistor-divider from IN or OUT; 1.215V threshold sets trip point; 4% hysteresis prevents chatter during recovery. |
| 4 POK | Open-drain power-good output | Asserts low when REG falls below 1.653V; requires external pullup; signals system controller of regulator fault. |
| 5 GND | Ground reference | Common return for all analog/digital functions; EP must be soldered to PCB ground plane for thermal and noise integrity. |
| 6 GATE | External n-MOSFET gate driver | Charge-pump output sourcing 75µA; drives gate to VIN+10V (typ); clamped to ≤18V above OUT to protect FET gate oxide. |
| 7 OUT | Output voltage sense node | Connected to source of external n-MOSFET; used as feedback point in limiter mode; referenced by SET divider in switch mode. |
| 8 REG | Fixed 1.8V linear regulator output | Sources up to 100mA; bypassed with ≥4.7µF ceramic capacitor; independent of SHDN state - true always-on rail. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable protection mode | Switch mode disconnects load on overvoltage; limiter mode sustains regulated output via GATE sawtooth - selectable via SET connection topology. |
| Integrated 1.8V low-IQ regulator | Delivers 100mA at 1.8V with only 37µA quiescent draw - eliminates need for separate always-on LDO in space-constrained designs. |
| Accurate SET threshold | 1.215V ±0.034V with 4% hysteresis - enables ±0.5% overvoltage trip accuracy using 1% resistors and standard layout practices. |
| Thermal shutdown with hysteresis | Triggers at +150°C junction temperature and resets at +130°C - protects IC and co-located MOSFET from thermal runaway during sustained overvoltage events. |
| Robust gate drive architecture | Charge-pump delivers >10V gate-to-source swing with fast 100ns turn-off - ensures reliable MOSFET switching even with high-threshold devices. |
| Wide-temp qualified operation | Specified from -40°C to +125°C ambient - validated for use in industrial PLCs, motor drives, and transportation electronics without derating. |
Applications
| Industrial Power Rails | Wall-Cube Power Devices |
|---|---|
|
Use Scenario: Protecting programmable logic controllers (PLCs) and I/O modules from 48V DC bus transients caused by relay switching or lightning-induced surges. IC Role / Device Role / Timing Role: Overvoltage protection controller that isolates downstream 3.3V/5V logic supplies using external n-MOSFET, while its 1.8V REG powers real-time clock and nonvolatile memory backup. Use Value: Prevents field failures due to >72V transients; maintains always-on functionality during brownouts via low-IQ regulator. |
Use Scenario: Securing USB-C PD adapters and universal wall adapters against input overvoltage from faulty mains converters or miswired AC-DC stages. IC Role / Device Role / Timing Role: Acts as primary overvoltage limiter - clamps output to safe level during surge, sustaining regulated 1.8V supply to adapter controller MCU without interruption. Use Value: Enables fail-safe operation during line transients; eliminates need for secondary crowbar or TVS at output stage. |
| Notebook Computer Power Management | FireWire® Interface Protection |
|
Use Scenario: Safeguarding embedded controller (EC) and battery fuel-gauge ICs in notebook platforms against 19V adapter overvoltage faults. IC Role / Device Role / Timing Role: Switch-mode protector that disconnects EC rail within 100ns of overvoltage detection; 1.8V REG independently powers EC's wake-up logic during sleep states. Use Value: Guarantees zero current leakage into protected subsystems during fault; preserves battery life via 37µA quiescent draw. |
Use Scenario: Protecting FireWire PHY and link-layer controllers from hot-plug transients and cable ESD events exceeding IEEE 1394 limits. IC Role / Device Role / Timing Role: Voltage limiter configured to clamp FireWire VCC rail at 3.6V (via SET divider), while 1.8V REG powers PHY configuration registers and status monitoring logic. Use Value: Maintains link-layer functionality during transient; avoids PHY reset or data corruption caused by rail collapse. |
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 regulator output; same pinout, package, and protection architecture. | Used where system requires 3.3V always-on rail instead of 1.8V - e.g., powering 3.3V microcontrollers or interface buffers. | Select MAX6397TATA+ when target load requires 3.3V bias; otherwise retain MAX6397WATA+ for 1.8V logic compatibility. |
| MAX6398ATT+ | No integrated regulator; 6-pin TDFN package; identical protection core and SET/GATE/OUT functionality. | Preferred for space-constrained designs needing only overvoltage control - eliminates REG/POK pins and reduces footprint by 25%. | Choose MAX6398ATT+ if external 1.8V rail already exists; MAX6397WATA+ is optimal when adding dedicated low-noise 1.8V supply is required. |
Compared with MAX6397TATA+ and MAX6398ATT+, the MAX6397WATA+ uniquely combines 1.8V regulation, overvoltage switch/limiter flexibility, and industrial temperature range in a single 8-pin TDFN - making it the only solution for compact, self-contained 1.8V-powered protection nodes.
Availability
MAX6397WATA+ is available at Aetrix Electronics and suitable for industrial power rails, wall-cube power devices, and notebook computer power management requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MAX6397WATA+ 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 computing applications.
The MAX6397 family delivers high-voltage overvoltage protection with integrated regulation - engineered specifically for robust DC power conditioning in environments subject to transients, wide input ranges, and long-term reliability requirements.
FAQ
What is the exact output voltage and tolerance of the MAX6397WATA+ linear regulator?
The MAX6397WATA+ integrates a factory-trimmed 1.8V linear regulator with output voltage specified as 1.76V to 1.837V at 1mA load and 1.715V to 1.837V across 1–100mA load range, measured at TJ = -40°C to +125°C. This corresponds to ±3.5% initial accuracy over temperature and load, meeting requirements for powering 1.8V logic and low-voltage peripherals without external trimming.
How does the MAX6397WATA+ implement overvoltage limiting versus switching behavior?
The MAX6397WATA+ selects mode based on SET pin connection: when SET ties to OUT, it operates in limiter mode - driving GATE in sawtooth waveform to regulate output voltage at the programmed threshold; when SET ties to IN, it acts as a switch - pulling GATE low to disconnect load instantly upon overvoltage detection. Both modes use the same 1.215V SET threshold and internal comparator.
What is the purpose and electrical specification of the POK pin on the MAX6397WATA+?
The POK (Power-OK) pin on the MAX6397WATA+ is an open-drain output that asserts low when the REG output falls below 1.653V (92.5% of 1.8V nominal). It sinks up to 1.6mA at 0.3V and exhibits <100nA leakage when high. A pullup resistor (typically 100kΩ to REG) is required to generate a logic-high signal indicating regulator health.
Can the MAX6397WATA+ operate with input voltages below 6.5V, and what are the implications for the 1.8V regulator?
Yes, the MAX6397WATA+ operates down to 5.5V input, but the 1.8V regulator requires VIN ≥ 6.5V for full 100mA output capability per datasheet specifications. Below 6.5V, dropout increases and maximum load current decreases - e.g., at VIN = 5.8V, usable output current drops to ~30mA. UVLO disables GATE until VIN exceeds 4.66V, but REG remains active.
What thermal design considerations apply to the MAX6397WATA+ when used in overvoltage limiter mode?
In overvoltage limiter mode, the external n-MOSFET dissipates significant power (P = VDS × ILOAD) during sustained overvoltage events. The MAX6397WATA+'s thermal shutdown triggers at +150°C junction temperature and resets at +130°C. To ensure reliable operation, the IC's exposed pad must be soldered to a ≥100mm² copper pour, and the MOSFET should be placed adjacent to OUT for shared thermal monitoring.
MAX6397WATA+ 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:
- 1.653V
- 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)
MAX6397WATA+ FAQ
1.How can I place an order for MAX6397WATA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6397WATA+ 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 MAX6397WATA+ reliable?
The price and inventory of MAX6397WATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6397WATA+ is usually 5 days.
3.What payment methods are accepted for MAX6397WATA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6397WATA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6397WATA+?
MAX6397WATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6397WATA+ 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 MAX6397WATA+?
For technical support, including MAX6397WATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6397WATA+ requirements.
6.How does Aetrix verify that MAX6397WATA+ is sourced from the original manufacturer or authorized distributors?
All MAX6397WATA+ 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 MAX6397WATA+ meets industry standards.
7.What is the process for return or replacement of MAX6397WATA+?
All MAX6397WATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6397WATA+, 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 MAX6397WATA+ part is unused and in its original packaging.
Return procedure for MAX6397WATA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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