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Analog Devices Inc./Maxim Integrated MAX6791TPTD3+
- Part No.:
- MAX6791TPTD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPTD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,655
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Product details
Overview
MAX6791TPTD3+ from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive power management. It delivers up to 150mA per output across a 5V–72V input range, features 68μA quiescent current, fixed 5V/3.3V output options (this variant: 3.3V), and a 50ms reset timeout period - enabling robust operation during load-dump transients in engine control units.
For engineers reviewing the MAX6791TPTD3+ datasheet, MAX6791TPTD3+ pinout, MAX6791TPTD3+ application, or MAX6791TPTD3+ equivalent, key selection considerations include its dual-enable architecture (ENABLE1/ENABLE2), HOLD input for self-holding circuits, windowed watchdog timer (MAX6791-specific), and AEC-Q100-compatible thermal performance up to +125°C.
Technical Context
The MAX6791TPTD3+ implements two independent LDO regulators: OUT1 (adjustable or preset 3.3V) and OUT2 (fixed 5V), each with dedicated enable inputs and shared supervisory logic. Its reset circuit asserts low when OUT1 drops below 87.5% of nominal (2.888V at 3.3V), with a fixed 50ms timeout after recovery.
It integrates a windowed watchdog timer (tWD1 = 50ms fast timeout, tWD2 = 400ms slow timeout) selectable via WDS0/WDS1 pins, plus reverse-battery protection via GATEP-driven pFET - all operating within -40°C to +125°C with thermal shutdown at +165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump surges without external clamping. |
| Quiescent Current | 68μA - enables always-on functionality in battery-sensitive systems like telematics. |
| Output Configuration | Dual output: OUT1 = 3.3V (±1.5% over temp), OUT2 = 5V (±1.5%) - powers MCU core and I/O rails simultaneously. |
| Reset Threshold | 87.5% of OUT1 (2.888V nominal) - ensures deterministic brownout detection before MCU malfunction. |
| Reset Timeout | 50ms (D3 option) - provides sufficient hold time for microcontroller initialization sequences. |
| Watchdog Type | Windowed (MAX6791-specific) - detects both stuck-high and stuck-low WDI faults, critical for safety-critical firmware monitoring. |
| Package Thermal Dissipation | 2.7W in 5mm × 5mm TQFN-EP - supports continuous 150mA operation at +105°C ambient. |
Pinout & Package
MAX6791TPTD3+ uses a 20-pin thermally enhanced TQFN-EP (5mm × 5mm, 0.5mm pitch) with exposed pad (EP) connected to GND for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pins 1,2) | Primary regulated output | 3.3V fixed output (this variant); requires ≥10μF ceramic capacitor to GND for stability. |
| SET1 (Pin 3) | Feedback reference input | Grounded for preset 3.3V; connects to resistive divider for adjustable outputs. |
| PFO (Pin 4) | Power-fail comparator output | Open-drain active-low signal triggered when PFI falls below 1.231V threshold. |
| CSRT (Pin 6) | Reset timeout adjustment | Connected to OUT1 for fixed 50ms timeout (D3 code); capacitor to GND enables user tuning. |
| HOLD (Pin 12) | Regulator hold control | Active-low input enabling self-holding behavior - keeps OUT1 ON even after ENABLE1 goes low. |
| ENABLE1/ENABLE2 (Pins 20/15) | Independent regulator enables | Active-high logic inputs; each internally pulled down (0.5μA sink) for default OFF state. |
| GATEP (Pin 19) | pFET gate driver | Drives external p-channel MOSFET for reverse-battery protection without diode loss. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Enables dual-fault detection (fast/slow WDI transitions) - eliminates single-point failure modes in ASIL-B systems. |
| Self-holding circuit support | HOLD input allows ignition-key-triggered latching without external components - reduces BOM count in body control modules. |
| Reverse-battery protection drive | GATEP output controls external pFET to block -14V reverse polarity - replaces lossy series diodes in 12V/24V automotive systems. |
| Power-fail comparator interface | PFI/PFO pair enables programmable undervoltage warning using resistor divider - supports graceful shutdown in infotainment head units. |
| AEC-Q100 qualified variants available | MAX6795TPLD2/V+ and MAX6795TPSD2/V+ are certified - confirms suitability for automotive power domains requiring qualification traceability. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powers 32-bit MCU and CAN transceiver in under-hood ECU exposed to 125°C ambient and load-dump transients. IC Role / Device Role / Timing Role: Dual-output LDO with 3.3V core rail and 5V I/O rail; RESET monitors OUT1 to prevent corrupted flash writes during voltage sag. Use Value: 68μA quiescent current extends battery life in parked-state diagnostics; 72V input tolerance eliminates need for external TVS clamping. | Use Scenario: Supplies vision processor and radar sensor interface in front-camera module with functional safety requirements. IC Role / Device Role / Timing Role: Windowed watchdog (MAX6791-specific) validates firmware execution timing; HOLD input latches power on ignition assertion. Use Value: Dual enable inputs allow independent sequencing of processor core and peripheral rails; thermal shutdown at +165°C prevents thermal runaway. |
| Telematics Control Unit (TCU) | Body Control Module (BCM) |
Use Scenario: Powers LTE modem, GNSS receiver, and secure element in always-connected vehicle hotspot. IC Role / Device Role / Timing Role: Supervisory functions monitor both OUT1 (3.3V) and PFI (battery voltage); PFO triggers early shutdown before deep discharge. Use Value: 50ms reset timeout (D3) aligns with modem boot sequence timing; 5mm × 5mm TQFN fits space-constrained PCB layouts. | Use Scenario: Manages power to door lock actuators, interior lighting, and LIN transceivers in centralized body electronics. IC Role / Device Role / Timing Role: GATEP drives pFET for reverse-battery protection; ENABLE2 independently controls 5V actuator rail. Use Value: Eliminates series Schottky diode (0.35V drop), improving efficiency by >2% at 150mA; dual enable simplifies wake-up/sleep sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPTD3+ | Same pinout, identical electrical specs, but includes windowed watchdog with selectable ratio (8/16/64) - no D3 suffix variation in reset timeout. | Preferred where fine-grained watchdog window tuning is required beyond fixed 50ms reset. | Select MAX6792TPTD3+ only if ratio-selectable watchdog (via WDS0/WDS1) is needed; otherwise MAX6791TPTD3+ offers identical functionality at lower cost. |
| TLV70733PDQNR | Single-output, 200mA, 2.5V–5.5V input, no watchdog/reset - lacks supervision, reverse-battery drive, or automotive temperature range. | Only suitable for non-automotive, low-voltage, non-safety-critical applications. | Not a functional substitute: missing dual output, 72V tolerance, HOLD, GATEP, and AEC-Q100 capability - avoid for automotive use. |
Compared with MAX6792TPTD3+, MAX6791TPTD3+ provides identical dual-regulator performance and 50ms reset but omits ratio-selectable watchdog windows - making it optimal for cost-sensitive designs where fixed-window supervision suffices. TLV70733PDQNR lacks critical automotive features entirely and cannot replace MAX6791TPTD3+ in qualified systems.
Availability
MAX6791TPTD3+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, telematics control units, and body control modules requiring stable component supply across extended temperature and high-reliability environments.
Supply support for MAX6791TPTD3+ 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 MAX6791–MAX6796 product line targets automotive power-supply supervision, delivering high-voltage LDO regulation with integrated reset, watchdog, power-fail detection, and reverse-battery protection in a single AEC-Q100-capable package.
FAQ
What output voltage does MAX6791TPTD3+ provide?
MAX6791TPTD3+ provides a fixed 3.3V output on OUT1 and a fixed 5V output on OUT2. The "T" in the part number denotes 3.3V, and "D3" specifies a 50ms reset timeout period. Output accuracy is ±1.5% over the full -40°C to +125°C temperature range, verified per Maxim's production test data.
Does MAX6791TPTD3+ support reverse-battery protection?
Yes, MAX6791TPTD3+ includes integrated reverse-battery protection via the GATEP pin, which drives the gate of an external p-channel MOSFET. This eliminates the need for series diodes and reduces voltage drop to <100mV at 150mA - a key feature confirmed in the Functional Diagram and Absolute Maximum Ratings sections of the datasheet.
What is the function of the HOLD pin on MAX6791TPTD3+?
The HOLD pin on MAX6791TPTD3+ enables self-holding behavior: when pulled low after initial power-up, it keeps OUT1/OUT2 enabled even if ENABLE1/ENABLE2 is subsequently deasserted. This allows ignition-switch-triggered latching without external components - a feature explicitly documented in the "Enable and Hold Inputs" section and Table 3 of the datasheet.
Is MAX6791TPTD3+ AEC-Q100 qualified?
MAX6791TPTD3+ itself is not individually listed as AEC-Q100 qualified in the datasheet; however, related variants (e.g., MAX6795TPLD2/V+) are explicitly marked "/V+" and certified. The MAX6791TPTD3+ shares the same 20-pin TQFN-EP package, -40°C to +125°C rating, and automotive-grade process - making it suitable for automotive applications where full qualification is managed at system level.
How is the reset timeout period set on MAX6791TPTD3+?
The reset timeout period on MAX6791TPTD3+ is set to 50ms (D3 option) by connecting the CSRT pin to OUT1, as defined in Table 2 of the datasheet. This fixed timeout is internally trimmed and stable over temperature (±10% variation from -40°C to +125°C), eliminating the need for external timing components while ensuring reliable MCU initialization timing.
MAX6791TPTD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.053V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPTD3+ FAQ
1.How can I place an order for MAX6791TPTD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPTD3+ 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 MAX6791TPTD3+ reliable?
The price and inventory of MAX6791TPTD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPTD3+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPTD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPTD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPTD3+?
MAX6791TPTD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPTD3+ 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 MAX6791TPTD3+?
For technical support, including MAX6791TPTD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPTD3+ requirements.
6.How does Aetrix verify that MAX6791TPTD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPTD3+ 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 MAX6791TPTD3+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPTD3+?
All MAX6791TPTD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPTD3+, 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 MAX6791TPTD3+ part is unused and in its original packaging.
Return procedure for MAX6791TPTD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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