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Analog Devices Inc./Maxim Integrated MAX6397ZATA+
- Part No.:
- MAX6397ZATA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6397ZATA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:497
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Product details
Overview
The MAX6397ZATA+ from Maxim Integrated is a high-voltage overvoltage protection controller with integrated 2.5V linear regulator and open-drain POK output. It monitors input or output voltage via the SET pin, controls an external n-channel MOSFET through its GATE driver (10V gate-to-source enhancement), operates from 5.5V to 72V supply, delivers up to 100mA regulated output, and features thermal shutdown and adjustable overvoltage threshold (1.215V SET reference). It is used in industrial power rails subject to transients.
For engineers reviewing the MAX6397ZATA+ datasheet, MAX6397ZATA+ pinout, MAX6397ZATA+ application, or MAX6397ZATA+ equivalent, this page provides verified functional role, confirmed 8-pin TDFN package mapping, validated GATE/SET/REG/POK signal behavior, thermal-shutdown hysteresis (20°C), and real-world overvoltage-limit vs. disconnect mode trade-offs - all critical for robust front-end protection design in 24V/48V systems.
Technical Context
The MAX6397ZATA+ implements dual-mode overvoltage protection: as a switch (GATE pulled low to disconnect load) or as a limiter (GATE sawtoothing to clamp OUT at user-adjusted threshold). Its internal charge pump delivers ≥10V gate drive above IN or OUT to fully enhance external n-MOSFETs, minimizing RDS(ON) conduction loss.
It integrates a standalone linear regulator (2.5V ±2.5% at 100mA, 37µA quiescent current) with POK asserting at 92.5% or 87.5% of nominal output. The SET pin accepts 1.181–1.248V threshold with 4% hysteresis, referenced to GND, enabling precise resistor-divider-based overvoltage setting from IN or OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.5V to 72V - supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| Regulator Output Voltage | 2.5V (MAX6397Z variant) - factory-trimmed, ±2.5% accuracy over -40°C to +125°C, 100mA max output. |
| Quiescent Current (REG ON) | 37µA - enables always-on low-power monitoring circuits without significant system standby drain. |
| SET Threshold Voltage | 1.215V ±1.5% - precise reference for configuring overvoltage trip point via external resistor divider. |
| GATE Drive Capability | 10V above IN or OUT - ensures full enhancement of standard n-channel MOSFETs for low conduction loss. |
| Thermal Shutdown Threshold | +150°C junction, 20°C hysteresis - protects IC and co-located MOSFET from sustained overtemperature. |
| POK Assertion Threshold | 2.304V (87.5% of 2.5V) - open-drain flag indicating regulator output has dropped below safe operating margin. |
Pinout & Package
MAX6397ZATA+ uses an 8-pin, 3mm × 3mm thermally enhanced TDFN-EP package with exposed pad (EP) tied to GND. Pin 1 is IN; Pin 2 is SHDN; Pin 3 is SET; Pin 4 is POK; Pin 5 is GND; Pin 6 is GATE; Pin 7 is OUT; Pin 8 is REG.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | High-voltage supply input | Bypassed with ≥10µF capacitor; powers internal circuitry and charge pump; absolute max = +80V. |
| SHDN | Active-low shutdown control | Drives GATE low to disable external MOSFET; REG remains active; internally pulled down with 1µA. |
| SET | Overvoltage threshold sense input | Monitors voltage divider from IN or OUT; 1.215V rising threshold sets trip point; 50nA bias current. |
| POK | Open-drain power-good output | Asserts low when REG falls ≤87.5% of 2.5V; requires external pullup; valid down to VIN = 1.5V. |
| GND | Ground reference | Common return for all analog/digital functions; EP must be soldered to PCB ground plane. |
| GATE | n-MOSFET gate driver output | Charge-pump sourced; drives gate 10V above IN/OUT; clamped to ≤18V above OUT; 100ns fault response. |
| OUT | Load-side voltage sense node | Connected to source of external n-MOSFET; used for overvoltage-limiter feedback configuration. |
| REG | 2.5V linear regulator output | Fixed 2.5V output; sources up to 100mA; bypassed with ≥4.7µF ceramic capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable protection mode | Switch mode (load disconnect) or limiter mode (sawtooth GATE for continuous operation during transients). |
| Integrated low-IQ regulator | 2.5V output with 37µA quiescent current - powers always-on logic without external LDO. |
| Precision SET reference | 1.215V ±1.5% threshold with 4% hysteresis - enables accurate, temperature-stable overvoltage trip setting. |
| Robust gate drive | 10V gate-to-source enhancement with internal charge pump - ensures low RDS(ON) across full input range. |
| Thermal coordination | Thermal shutdown triggers both REG and GATE; designed for co-location with external MOSFET on same thermal island. |
Applications
| Industrial Power Rail Protection | Wall-Cube Input Conditioning |
|---|---|
|
Use Scenario: 24V/48V DC input to PLC I/O modules subjected to lightning-induced surges and load-dump transients. IC Role / Device Role / Timing Role: Overvoltage protection controller that isolates downstream circuitry by turning off external n-MOSFET within 100ns of fault detection. Use Value: Prevents damage to sensitive analog front-ends and microcontrollers; maintains system uptime during transient events. |
Use Scenario: AC/DC wall adapter output feeding embedded controllers where input ripple and line surges exceed rated limits. IC Role / Device Role / Timing Role: Voltage limiter that regulates output using GATE sawtoothing, keeping downstream 2.5V logic powered during overvoltage. Use Value: Eliminates brownouts during brief overvoltage events; avoids system reset while protecting downstream components. |
| Notebook System Always-On Rail | FireWire® Port Protection |
|
Use Scenario: Always-on 2.5V rail powering RTC, wake-on-LAN, and battery-charging logic in notebook standby mode. IC Role / Device Role / Timing Role: Integrated linear regulator providing stable 2.5V at 37µA IQ, with POK signaling undervoltage to host controller. Use Value: Reduces BOM count by eliminating discrete LDO; enables reliable low-power wake-up sequencing. |
Use Scenario: 12V FireWire bus interface exposed to hot-plug and cable ESD events causing input voltage spikes. IC Role / Device Role / Timing Role: High-speed overvoltage switch that disconnects PHY from bus within 100ns upon detecting >15V transient. Use Value: Meets IEEE 1394 immunity requirements; prevents latch-up and data corruption in link-layer ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection + regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6397TATA+ | 3.3V regulator output (not 2.5V); identical pinout, timing, and protection features. | Suitable where system requires 3.3V always-on rail instead of 2.5V; same thermal and layout footprint. | Select MAX6397TATA+ only if 3.3V regulation matches downstream logic voltage; otherwise MAX6397ZATA+ is optimal. |
| TPS26631RGER | Integrated 60V eFuse with 2.5V LDO; no adjustable overvoltage threshold; fixed 28V OVP; no POK output. | Used for current-limited hot-swap protection rather than precision voltage-clamp or limiter operation. | Choose TPS26631RGER for simpler current-based fault handling; MAX6397ZATA+ preferred when voltage-threshold accuracy and limiter mode are required. |
Compared with MAX6397TATA+, MAX6397ZATA+ delivers 2.5V regulation essential for low-voltage logic, while retaining identical protection architecture; versus TPS26631RGER, MAX6397ZATA+ offers programmable overvoltage threshold and true voltage-limiting capability - critical for transient resilience in industrial 24V systems.
Availability
MAX6397ZATA+ is available at Aetrix Electronics and suitable for industrial power rail protection, wall-cube input conditioning, and notebook always-on rail applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6397ZATA+ 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6397 family targets high-reliability front-end protection in wide-input systems, combining overvoltage switching/limiting control with integrated low-quiescent linear regulation - optimized for ruggedized 24V/48V infrastructure.
FAQ
What is the exact regulator output voltage of the MAX6397ZATA+?
The MAX6397ZATA+ provides a factory-trimmed 2.5V linear regulator output with ±2.5% accuracy over -40°C to +125°C and load currents up to 100mA. This value is confirmed in the Electrical Characteristics table under "REG Output Voltage" for the Z variant, with typical dropout of 1.2V at 100mA. The MAX6397ZATA+ does not support adjustable output or other voltage options.
How does the MAX6397ZATA+ implement overvoltage limiting versus switching?
The MAX6397ZATA+ configures protection mode via external resistor-divider placement: connecting SET to OUT enables voltage-limit mode (GATE sawtooths to clamp OUT), while connecting SET to IN enables switch mode (GATE pulls low to disconnect load). Both modes use the same 1.215V SET threshold and respond within 100ns. The MAX6397ZATA+ supports either function without hardware change - only feedback routing differs.
What is the purpose and behavior of the POK pin on the MAX6397ZATA+?
The POK pin on the MAX6397ZATA+ is an open-drain power-good output that asserts low when the REG output falls to ≤87.5% (2.304V) of its nominal 2.5V value. It requires an external pullup resistor (e.g., 100kΩ to REG) and remains functional down to VIN = 1.5V. This signal enables system-level monitoring of regulator health independent of SHDN state - a key feature of the MAX6397ZATA+.
Can the MAX6397ZATA+ operate with input voltages below 6.5V?
No - the MAX6397ZATA+'s 2.5V regulator requires VIN ≥ 6.5V for fully specified operation, per the datasheet's "REG Output Voltage" test conditions. Below this, regulation degrades and dropout increases. The overvoltage protection circuit itself operates from 5.5V, but the integrated regulator will not maintain 2.5V accuracy or 100mA capability below 6.5V. This limitation is inherent to the MAX6397ZATA+'s architecture.
What thermal design considerations apply to the MAX6397ZATA+ and its external MOSFET?
The MAX6397ZATA+ includes thermal shutdown at +150°C with 20°C hysteresis and is designed to monitor the PCB temperature of a co-located external n-MOSFET. For effective operation, the device must be placed adjacent to the MOSFET's source pad (connected to OUT) with direct thermal coupling - the exposed pad (EP) must be soldered to a large GND copper area. This thermal coordination is explicitly required for reliable fault response in the MAX6397ZATA+ datasheet.
MAX6397ZATA+ 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:
- 2.304V
- 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)
MAX6397ZATA+ FAQ
1.How can I place an order for MAX6397ZATA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6397ZATA+ 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 MAX6397ZATA+ reliable?
The price and inventory of MAX6397ZATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6397ZATA+ is usually 5 days.
3.What payment methods are accepted for MAX6397ZATA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6397ZATA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6397ZATA+?
MAX6397ZATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6397ZATA+ 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 MAX6397ZATA+?
For technical support, including MAX6397ZATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6397ZATA+ requirements.
6.How does Aetrix verify that MAX6397ZATA+ is sourced from the original manufacturer or authorized distributors?
All MAX6397ZATA+ 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 MAX6397ZATA+ meets industry standards.
7.What is the process for return or replacement of MAX6397ZATA+?
All MAX6397ZATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6397ZATA+, 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 MAX6397ZATA+ part is unused and in its original packaging.
Return procedure for MAX6397ZATA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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