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Analog Devices Inc./Maxim Integrated MAX6397LATA+W
- Part No.:
- MAX6397LATA+W
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6397LATA+W.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,986
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Product details
Overview
MAX6397LATA+W from Maxim Integrated is an overvoltage protection controller with integrated 5V linear regulator, designed to safeguard downstream loads against transients up to 72V input. It controls an external n-channel MOSFET via charge-pump-driven GATE output, provides adjustable overvoltage threshold (via SET pin), delivers 100mA regulated output, and asserts open-drain POK at 92.5% VREG. It is used in industrial power rails and wall-cube-powered systems requiring robust transient survival.
For engineers reviewing the MAX6397LATA+W datasheet, MAX6397LATA+W pinout, MAX6397LATA+W application, or MAX6397LATA+W equivalent, this page delivers verified functional identity, confirmed 8-pin TDFN-EP package mapping, validated GATE/SET/REG/POK pin roles, exact 5.0V regulator specification, thermal shutdown behavior, and two rigorously cross-checked alternative parts for overvoltage protection + LDO integration.
Technical Context
The MAX6397LATA+W implements dual-mode overvoltage protection: switch mode (disconnects load on IN overvoltage) and limiter mode (sawtooth GATE modulation to clamp OUT voltage). Its internal charge pump delivers ≥10V gate-to-source drive above VIN (≥14V) to fully enhance external n-MOSFETs, minimizing RDS(ON) conduction loss.
It integrates a standalone linear regulator (5.0V ±1.5%, 100mA max) that remains active regardless of SHDN state or MOSFET status. The POK output asserts low when REG drops below 4.67V (92.5% of 5V), with 35µs delay and <0.3V VOL at 1.6mA sink - enabling reliable system power-good signaling even at VIN = 1.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.5V to 72V - supports wide-input industrial and adapter-fed systems without external pre-regulation. |
| Regulator Output | 5.0V ±1.5% (1mA–100mA load) - factory-trimmed LDO for always-on MCU peripherals or supervisory circuits. |
| Quiescent Current | 37µA (SHDN = GND) - enables ultra-low-power operation in battery-backed or energy-harvesting standby modes. |
| Overvoltage Threshold | Adjustable via SET resistor divider; 1.215V reference with 4% hysteresis - allows precise trip points (e.g., 20V ±1V) independent of temperature drift. |
| GATE Drive Capability | Charge-pump output sourcing 75µA to ≥VIN + 10V - ensures full enhancement of logic-level n-MOSFETs with RDS(ON) < 20mΩ at 100mA load. |
| Thermal Shutdown | Activates at TJ = +150°C with 20°C hysteresis - protects both IC and co-located MOSFET by disabling REG and GATE simultaneously. |
| Operating Temperature | -40°C to +125°C (TJ) - qualified for under-hood automotive auxiliary rails and industrial control cabinets. |
Pinout & Package
MAX6397LATA+W is housed in an 8-pin, 3mm × 3mm thermally enhanced TDFN-EP package with exposed pad (EP) soldered to PCB ground plane for optimal thermal dissipation. Pin 1 is marked by dot; EP must be connected to GND.
| 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 MOSFET; REG remains active; internally pulled down (1µA). |
| 3 SET | Overvoltage threshold reference input | Accepts 1.215V rising threshold; 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 4.67V; requires external pullup (e.g., 100kΩ to REG). |
| 5 GND | Analog/digital ground reference | Common return for all signals; ties to EP for thermal and noise integrity. |
| 6 GATE | Charge-pump gate-drive output | Sources 75µA to ≥VIN + 10V; sinks >100mA during fault; clamped to ≤18V above OUT. |
| 7 OUT | Output voltage sense node | Connects to MOSFET source; used as feedback point in limiter mode or as reference in switch mode. |
| 8 REG | 5.0V regulated output | Delivers up to 100mA; bypass with ≥4.7µF ceramic capacitor; dropout ≤1.2V at 100mA. |
Key Features
| Feature | Design Value |
|---|---|
| Dual overvoltage response modes | Configurable as disconnect switch (fast GATE pull-down) or voltage limiter (sawtooth GATE modulation) - preserves system uptime during transients. |
| Integrated 5V/100mA linear regulator | Always-on, 37µA quiescent current, 5.5V–72V input range - eliminates need for separate bias rail in high-voltage systems. |
| Charge-pump gate drive | Delivers ≥10V gate-to-source voltage across full input range (14V–72V) - ensures low RDS(ON) conduction for high-efficiency power path. |
| Accurate, temperature-stable SET threshold | 1.215V ±0.033V (–40°C to +125°C), 4% hysteresis - enables repeatable overvoltage trip points without calibration. |
| Robust fault protection | Internal thermal shutdown (+150°C), UVLO (5.0V turn-on), GATE-to-OUT clamp (≤18V), and POK monitoring - reduces external protection components. |
Applications
| Industrial Power Input Protection | Wall-Cube Adapter Interface |
|---|---|
Use Scenario: 24V/48V DC input rails in PLC I/O modules exposed to lightning-induced surges or inductive kickback. IC Role / Device Role / Timing Role: Overvoltage protection controller and local 5V bias generator - monitors IN, drives external MOSFET, supplies isolated logic domain. Use Value: Survives 72V transients while maintaining 5V supply to microcontroller and ADC; eliminates need for discrete TVS + LDO stack. |
Use Scenario: AC/DC wall adapters feeding embedded devices where poor-quality adapters cause overvoltage faults. IC Role / Device Role / Timing Role: Input supervisor and always-on 5V regulator - detects >20V input excursions, limits output via GATE sawtooth, powers USB interface logic. Use Value: Prevents damage to downstream USB PHY or flash memory during adapter failure; maintains communication link during fault via limiter mode. |
| Notebook Auxiliary Power Rail | FireWire® Cable-Powered Devices |
Use Scenario: +19V notebook adapter input powering always-on EC (Embedded Controller) and RTC circuits. IC Role / Device Role / Timing Role: High-voltage protector and low-IQ 5V regulator - guards EC supply against adapter overvoltage, provides clean 5V with POK confirmation. Use Value: Enables instant wake-from-suspend with guaranteed 5V rail integrity; POK signal validates regulator health before firmware boot. |
Use Scenario: FireWire bus-powered peripherals (e.g., audio interfaces) subjected to hot-plug transients exceeding IEEE 1394 limits. IC Role / Device Role / Timing Role: Transient suppressor and local 5V source - senses cable voltage spikes at IN, isolates load via GATE, powers FireWire PHY independently. Use Value: Meets FireWire robustness requirements without derating; REG's 37µA IQ extends battery life in portable implementations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection + integrated LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6398ATT+W | No integrated regulator; 6-pin TDFN; identical OV protection architecture and GATE drive. | Requires external 5V LDO; better suited when bias rail already exists or higher efficiency is prioritized. | Select when system already includes a low-noise 5V supply and board space is constrained (6-pin vs. 8-pin). |
| TPS26631RGER | Integrated 5V LDO (150mA), but fixed 28V overvoltage threshold; no SET-adjustability; 1.2ms fault response vs. sub-µs. | Limited to fixed-threshold applications; lacks precision programmability and fast transient response. | Choose only if design tolerates fixed 28V trip and slower reaction; not suitable for custom threshold or high-speed surge suppression. |
Compared with MAX6397LATA+W, MAX6398ATT+W removes the regulator to reduce cost and footprint but requires external biasing, while TPS26631RGER trades adjustability and speed for simplified fixed-threshold implementation - making MAX6397LATA+W uniquely balanced for precision, integration, and transient resilience.
Availability
MAX6397LATA+W is available at Aetrix Electronics and suitable for industrial control systems, wall-cube-powered consumer electronics, and notebook auxiliary power rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6397LATA+W 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 MAX6397LATA+W belongs to Maxim's high-voltage protection controller family, engineered specifically for systems needing simultaneous overvoltage fault response and integrated bias regulation in harsh electrical environments.
FAQ
What is the exact output voltage tolerance and load regulation of the MAX6397LATA+W regulator?
The MAX6397LATA+W delivers a nominal 5.0V output with ±1.5% initial accuracy (4.925V to 5.120V at 1mA) and ±3% total variation (4.85V to 5.15V) across 1mA–100mA load and -40°C to +125°C. Load regulation is 0.8mV/mA - meaning output shifts ≤80mV from 1mA to 100mA at fixed temperature.
How does the MAX6397LATA+W behave during startup and after SHDN assertion?
At power-up, MAX6397LATA+W enters UVLO until VIN exceeds 5.0V; then GATE enhances after 100µs startup delay. When SHDN is pulled low, GATE immediately discharges to OUT (turning off the MOSFET), but REG remains fully active - delivering 5V continuously. This enables "always-on" subsystems to stay powered while main load is disconnected.
Can the MAX6397LATA+W be used in overvoltage-limiter mode with a 24V input and 5V output requirement?
Yes - configure SET to monitor OUT (not IN) using a resistor divider. With VIN = 24V and desired VOUT limit = 5.5V, set VTH = 1.215V at SET by selecting R1/R2 such that (R2/(R1+R2)) × 5.5V = 1.215V. GATE will then modulate in sawtooth to hold OUT at ~5.5V, allowing downstream 5V circuits to remain operational during overvoltage events.
What is the maximum continuous current the MAX6397LATA+W can deliver through its REG pin?
The MAX6397LATA+W regulator is rated for up to 100mA continuous output current. At 100mA and VIN ≥ 6.5V, dropout is ≤1.2V, and ground current is ≤60µA. Exceeding 100mA risks thermal shutdown due to internal power dissipation - especially at high VIN or elevated ambient temperatures.
Does the MAX6397LATA+W POK output function when the device is in shutdown mode?
Yes - the POK output remains fully functional during SHDN assertion because the internal 5V regulator stays enabled. As long as REG voltage is ≥4.67V (92.5% of 5V), POK stays high (open-drain inactive); it pulls low only if REG sags due to overload, dropout, or thermal shutdown - providing true power-good status independent of MOSFET control state.
MAX6397LATA+W Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.67V
- 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)
MAX6397LATA+W FAQ
1.How can I place an order for MAX6397LATA+W through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6397LATA+W 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 MAX6397LATA+W reliable?
The price and inventory of MAX6397LATA+W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6397LATA+W is usually 5 days.
3.What payment methods are accepted for MAX6397LATA+W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6397LATA+W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6397LATA+W?
MAX6397LATA+W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6397LATA+W 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 MAX6397LATA+W?
For technical support, including MAX6397LATA+W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6397LATA+W requirements.
6.How does Aetrix verify that MAX6397LATA+W is sourced from the original manufacturer or authorized distributors?
All MAX6397LATA+W 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 MAX6397LATA+W meets industry standards.
7.What is the process for return or replacement of MAX6397LATA+W?
All MAX6397LATA+W units undergo pre-shipment inspection (PSI). If there is an issue with MAX6397LATA+W, 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 MAX6397LATA+W part is unused and in its original packaging.
Return procedure for MAX6397LATA+W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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