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Analog Devices Inc./Maxim Integrated MAX6399ATA+
- Part No.:
- MAX6399ATA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6399ATA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:186
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Product details
Overview
The MAX6399ATA+ from Analog Devices is a high-voltage overvoltage/undervoltage protection switch controller that monitors DC-DC converter input and output voltages, drives an external n-channel MOSFET via a charge-pump GATE output (VGS = 10V), latches off during overvoltage faults, and provides a POK signal for undervoltage detection. It operates from 5.75V to 72V and is rated for -40°C to +125°C.
For engineers reviewing the MAX6399ATA+ datasheet, MAX6399ATA+ pinout, MAX6399ATA+ application, or MAX6399ATA+ equivalent, this device serves as a system-level protection controller for high-reliability power rails in telecom, server, and industrial DC-DC systems requiring adjustable OV/UV thresholds, thermal shutdown, and latch-off behavior with manual reset via SHDN.
Technical Context
The MAX6399ATA+ implements dual-threshold monitoring: SET pin detects overvoltage at the DC-DC output using a precise 0.5V (typ) comparator with 5% hysteresis, while OUT_SET pin detects undervoltage at the DC-DC input using a 1.23V (typ) threshold. Its internal charge pump ensures VGATE = VIN + 10V (min) for full enhancement of external n-channel MOSFETs.
It features fast fault response (0.5µs SET-to-GATE propagation delay), 20mA GATE sink capability for rapid MOSFET turn-off, and thermal shutdown at +150°C with 20°C hysteresis. The GATE output latches low after overvoltage detection and remains latched until IN power cycle or SHDN toggle - no automatic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5.75V to 72V - enables direct monitoring of automotive, industrial, and telecom DC bus voltages without level-shifting. |
| SET Threshold Voltage | 0.480V to 0.517V - sets precise overvoltage trip point for DC-DC output via external resistor divider. |
| OUT_SET Threshold | 1.205V to 1.258V - defines adjustable undervoltage lockout threshold for DC-DC input voltage monitoring. |
| GATE Output High | VIN + 10V (typ) - guarantees full enhancement of external n-channel MOSFETs to minimize RDS(ON) and conduction loss. |
| Thermal Shutdown | +150°C with 20°C hysteresis - protects system by disabling GATE when junction temperature exceeds safe limit. |
| POK Output Type | Open-drain, active-low - signals undervoltage condition to enable/disable downstream DC-DC EN pin or microcontroller interrupt. |
| SHDN Input Logic | Active-low, VIH ≥ 1.4V, VIL ≤ 0.4V - allows hardware-controlled reset of latched-overvoltage state without power cycling. |
Pinout & Package
MAX6399ATA+ is housed in an 8-pin TDFN package (3mm × 3mm, 0.65mm pitch) with exposed pad (EP) for thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. IN | Supply Input | Main power rail input (5.75V–72V); requires ≥10µF bypass capacitor for stability. |
| 2. SHDN | Shutdown Control | Active-low input to force GATE low and unlatch overvoltage fault; internally pulled down to GND. |
| 3. SET | OV Threshold Sense | Monitors DC-DC output voltage via resistor divider; trips at 0.5V rising threshold for overvoltage detection. |
| 4. POK | Power-OK Output | Open-drain output asserting low when OUT_SET falls below 1.23V - used to control EN or flag UV condition. |
| 5. GND | Ground Reference | Analog and power ground reference; EP must be connected to same ground plane. |
| 6. GATE | MOSFET Driver | Charge-pump output driving external n-channel MOSFET gate; delivers VIN + 10V and sinks 20mA for fast turn-off. |
| 7. OUT | Source Sense | Connects to source of external n-channel MOSFET; used as reference for OUT_SET undervoltage sensing. |
| 8. OUT_SET | UV Threshold Sense | Monitors voltage at OUT (MOSFET source) via resistor divider; trips at 1.23V rising threshold for undervoltage detection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Charge Pump | Delivers guaranteed 10V gate drive above IN to fully enhance low-RDS(ON) n-channel MOSFETs, minimizing conduction losses. |
| Latched Overvoltage Response | Shuts off GATE within 0.5µs and holds it off until SHDN toggle or power recycle - prevents auto-retry during persistent fault conditions. |
| Adjustable Dual Thresholds | Independent SET (OV) and OUT_SET (UV) inputs allow independent, resistor-programmable trip points for flexible system-level protection tuning. |
| Thermal Shutdown with Hysteresis | Disables GATE at +150°C and re-enables only after cooling by 20°C - avoids thermal oscillation and supports robust thermal management. |
| Wide-Temperature Operation | Specified from -40°C to +125°C with validated performance across full range - suitable for under-hood automotive and industrial environments. |
Applications
| Telecom Power Systems | Server Backplane Protection |
|---|---|
Use Scenario: Protecting 48V intermediate bus in telecom shelf against transient overvoltage from hot-swap events or load dump. IC Role / Device Role / Timing Role: Overvoltage/undervoltage protection controller that isolates downstream DC-DC converters via external MOSFET when bus voltage exceeds 54V or drops below 42V. Use Value: Prevents catastrophic failure of sensitive 12V/5V POL converters by disconnecting input within sub-microsecond response time and holding fault state until operator intervention. | Use Scenario: Securing redundant 12V power inputs on server backplanes where multiple PSUs feed common rails. IC Role / Device Role / Timing Role: Monitors each PSU output for overvoltage (e.g., >13.2V) and undervoltage (e.g., <10.8V), asserting POK only when both are valid. Use Value: Enables safe OR-ing and failover logic by providing deterministic, latched fault signaling - eliminates risk of cross-conduction or bus collapse during PSU mismatch. |
| Industrial PLC I/O Modules | Automotive ADAS Power Distribution |
Use Scenario: Protecting 24V fieldbus-powered I/O modules from supply transients caused by inductive load switching or ESD. IC Role / Device Role / Timing Role: Acts as front-end protection switch controlling power delivery to isolated analog/digital circuitry based on real-time OV/UV status. Use Value: Maintains functional safety integrity by latching off during overvoltage and providing POK confirmation before enabling critical sensor interfaces. | Use Scenario: Safeguarding 12V domain power for radar and camera ECUs in vehicle start-stop and load-dump scenarios. IC Role / Device Role / Timing Role: Monitors battery-derived 12V rail for overvoltage (>16V) and undervoltage (<9V), driving local MOSFET to isolate ECU during fault. Use Value: Meets ISO 16750-2 pulse 5a/b immunity requirements by combining fast response, thermal shutdown, and latch-off behavior without software dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage/undervoltage protection controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS26631RGER | Integrated 60V eFuse with current limiting and programmable OV/UV; no external MOSFET required but fixed 60V max rating. | Best for compact designs needing current limiting and auto-reset; lacks latched fault mode and adjustable 72V operation. | Select TPS26631RGER if integrated current limiting and smaller footprint outweigh need for >60V operation and manual fault reset. |
| LT4363IMS-2#PBF | High-voltage surge protector with 100V abs max, built-in current sense, and auto-retry; no POK output or separate UV/OV adjustment pins. | Suited for surge-heavy environments like PoE or AC/DC front-ends; less precise for DC-DC output monitoring due to shared threshold architecture. | Choose LT4363IMS-2#PBF when transient suppression and auto-retry are prioritized over discrete OV/UV threshold tuning and POK signaling. |
Compared with TPS26631RGER and LT4363IMS-2#PBF, the MAX6399ATA+ uniquely offers 72V operation, independent SET/OUT_SET programming, latched fault behavior with SHDN reset, and dedicated POK output - making it optimal for high-reliability DC-DC protection where deterministic fault handling and wide voltage flexibility are essential.
Availability
MAX6399ATA+ is available at Aetrix Electronics and suitable for telecom infrastructure, server backplane power management, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability validation.
Supply support for MAX6399ATA+ 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, headquartered in Wilmington, MA.
The MAX6399ATA+ belongs to Analog Devices' high-voltage protection controller product line, designed specifically for robust, adjustable overvoltage and undervoltage monitoring in DC-DC power systems operating up to 72V.
FAQ
What is the maximum input voltage the MAX6399ATA+ can monitor directly?
The MAX6399ATA+ supports a supply voltage range of 5.75V to 72V, with absolute maximum ratings up to +80V on IN, OUT, and GATE pins. This allows direct monitoring of high-voltage rails such as 48V telecom buses and 60V industrial supplies without external attenuation. The device remains fully specified across its entire operating range from -40°C to +125°C.
How does the MAX6399ATA+ handle overvoltage faults - does it auto-reset?
No, the MAX6399ATA+ latches GATE low upon overvoltage detection and maintains that state until either the IN supply is cycled or the SHDN pin is toggled. This prevents automatic reconnection during persistent faults. The latch behavior is intentional for safety-critical applications, and SHDN provides a hardware-controlled reset path without requiring full power-down.
Can the MAX6399ATA+ drive any n-channel MOSFET, or are there specific selection criteria?
The MAX6399ATA+ is designed to drive standard n-channel MOSFETs, but selection must consider gate charge (Qg) and RDS(ON). The charge pump delivers ~100µA pull-up current and 20mA sink capability, so MOSFETs with Qg < 20nC ensure fast turn-on/turn-off. RDS(ON) should be minimized for the target load current to limit conduction loss and self-heating - typical selections include 2–5mΩ devices for 10–30A applications.
What is the function of the POK output on the MAX6399ATA+, and how is it used?
The POK (Power-OK) output on the MAX6399ATA+ is an open-drain, active-low signal that asserts low when the voltage at OUT_SET falls below its 1.23V (typ) threshold - indicating undervoltage at the monitored DC-DC input. It's commonly pulled up to a system rail (e.g., 3.3V) and used to enable/disable downstream DC-DC EN pins or trigger microcontroller interrupts, ensuring power sequencing integrity.
Does the MAX6399ATA+ provide thermal protection, and how is it implemented?
Yes, the MAX6399ATA+ includes internal thermal shutdown that disables the GATE output when the junction temperature reaches +150°C, with 20°C hysteresis for stable recovery. For effective operation, the IC must be placed in close thermal contact with the external MOSFET - ideally on the same thermal island - since the sensor monitors die temperature, not ambient or board temperature.
MAX6399ATA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Strip
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- 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)
MAX6399ATA+ FAQ
1.How can I place an order for MAX6399ATA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6399ATA+ 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 MAX6399ATA+ reliable?
The price and inventory of MAX6399ATA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6399ATA+ is usually 5 days.
3.What payment methods are accepted for MAX6399ATA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6399ATA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6399ATA+?
MAX6399ATA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6399ATA+ 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 MAX6399ATA+?
For technical support, including MAX6399ATA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6399ATA+ requirements.
6.How does Aetrix verify that MAX6399ATA+ is sourced from the original manufacturer or authorized distributors?
All MAX6399ATA+ 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 MAX6399ATA+ meets industry standards.
7.What is the process for return or replacement of MAX6399ATA+?
All MAX6399ATA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6399ATA+, 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 MAX6399ATA+ part is unused and in its original packaging.
Return procedure for MAX6399ATA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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