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Analog Devices Inc./Maxim Integrated MAX6791TPMD1+T
- Part No.:
- MAX6791TPMD1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPMD1+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,960
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Product details
Overview
MAX6791TPMD1+T 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, and includes watchdog, RESET, HOLD, and ENABLE1/ENABLE2 control logic - used in engine control units (ECUs) and ADAS domain controllers.
For engineers reviewing the MAX6791TPMD1+T datasheet, MAX6791TPMD1+T pinout, MAX6791TPMD1+T application, or MAX6791TPMD1+T equivalent, key selection criteria include its dual 150mA outputs, AEC-Q100-compatible thermal performance (−40°C to +125°C), windowed watchdog timer (MAX6791-specific), 5mm × 5mm TQFN-20 EP package, and automotive-grade reverse-battery protection via GATEP drive.
Technical Context
The MAX6791TPMD1+T implements two independent LDO regulators: OUT1 (adjustable or preset 1.8V/2.5V/3.3V/5V) and fixed 5V OUT2. Its supervisory block integrates a windowed watchdog timer (with selectable fast/slow fault detection via WDS0/WDS1), capacitor-adjustable reset timeout (CSRT), and power-fail comparator (PFI/PFO) referenced to 1.231V.
It uses internal current-sinking ENABLE inputs (0.5µA pulldown) and an active-low HOLD pin internally pulled to OUT1 (2µA), enabling self-holding circuitry without external components. The GATEP output drives an external pFET for reverse-battery protection, with clamp voltage of 13.8V–18.8V at VIN = 20V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without external protection. |
| Quiescent Current | 68μA typical - enables always-on functionality in battery-sensitive systems like telematics. |
| Output Current | 150mA per output (OUT1 & OUT2) - supports dual-rail MCU + peripheral powering from single IC. |
| Dropout Voltage | 840mV typ at 100mA (dual) - ensures regulation down to VIN = 5.84V for 5V OUT1 under full load. |
| Reset Threshold | 92.5% of OUT1 nominal - e.g., 4.625V for 5V output - provides precise brownout detection. |
| Watchdog Type | Windowed (MIN/MAX) - detects both stuck-high and stuck-low WDI faults, unique to MAX6791/MAX6792. |
| Operating Temp | −40°C to +125°C - fully specified for under-hood automotive environments. |
Pinout & Package
MAX6791TPMD1+T is housed in a thermally enhanced 5mm × 5mm, 20-pin TQFN-EP package (exposed pad connected to GND). The package dissipates up to 2.7W and supports continuous operation at high ambient temperatures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 | Regulator 1 Output | Configurable 1.8V–11V or preset 1.8V/2.5V/3.3V/5V; max 150mA; requires ≥10μF ceramic output cap. |
| SET1 | Feedback Input | Connect to GND for preset output; use resistive divider for adjustable output - sets VOUT1 = 1.231V × (1 + R1/R2). |
| OUT2 | Regulator 2 Output | Fixed 5V output; max 150mA; requires ≥10μF ceramic output cap. |
| ENABLE1 / ENABLE2 | Active-High Enable Inputs | Enable OUT1 (pin 20) and OUT2 (pin 15) independently; internally pulled down (0.5µA) - compatible with open-drain MCU GPIO. |
| HOLD | Active-Low Hold Input | Forces regulator ON even after ENABLE1/ENABLE2 goes low; internal 2µA pullup to OUT1 - enables ignition-key self-hold circuits. |
| WDI / WDS0 / WDS1 | Watchdog Interface | WDI accepts µP pulse train; WDS0/WDS1 select window ratio (8×, 16×, 64×) or disable - defines tWD1 fast timeout and tWD2 slow timeout. |
| RESET | Active-Low Reset Output | Push-pull or open-drain option; asserts when OUT1 drops below threshold or watchdog fault occurs; timeout set by CSRT. |
| GATEP | pFET Gate Driver | Drives external p-channel MOSFET for reverse-battery protection; clamped to 13.8–18.8V - eliminates series diode loss. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Simultaneously monitors for WDI stuck-high (slow fault) and stuck-low (fast fault) - prevents silent MCU lockup in safety-critical ECUs. |
| Dual Independent Enables | ENABLE1 controls OUT1; ENABLE2 controls OUT2 - allows staggered power-up of core logic and peripherals in multi-rail systems. |
| Self-Holding Circuit Support | HOLD pin latches regulator ON after initial enable - eliminates need for external latch or microcontroller firmware intervention during ignition sequencing. |
| Reverse-Battery Protection Drive | GATEP output directly drives pFET gate - achieves <50mΩ effective series resistance vs. >200mΩ for Schottky diode solutions, reducing heat and voltage drop. |
| Capacitor-Adjustable Timers | CSRT and CSWT pins accept external capacitors to set reset and watchdog timeouts - enables design flexibility without custom mask ROM or OTP programming. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powers 3.3V microcontroller core and 5V CAN transceiver from 12V vehicle battery subject to load-dump transients up to 72V. IC Role / Device Role / Timing Role: Dual-output LDO with integrated RESET and watchdog - provides clean, sequenced power and failsafe restart capability. Use Value: 68μA quiescent current minimizes battery drain during vehicle sleep mode; 72V input rating eliminates need for upstream TVS clamping. | Use Scenario: Supplies vision processor and radar sensor interface in front-camera module operating near engine compartment. IC Role / Device Role / Timing Role: High-temp LDO with HOLD function - maintains regulated output during ignition cycling without MCU coordination. Use Value: −40°C to +125°C operation and thermal shutdown (165°C) ensure reliability in under-hood thermal stress conditions. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Powers door-lock MCU and LIN transceiver while monitoring battery voltage for low-power wake-up via PFI comparator. IC Role / Device Role / Timing Role: Power-fail comparator (PFI/PFO) + dual LDO - enables graceful shutdown before brownout and rapid restart on recovery. Use Value: 1.231V precision PFI threshold allows accurate battery monitoring with simple resistor divider; 35μs response ensures timely warning. | Use Scenario: Powers cellular modem and GNSS receiver in always-connected fleet management unit with persistent GPS tracking. IC Role / Device Role / Timing Role: Windowed watchdog + RESET output - detects modem firmware hangs and forces controlled reboot without host CPU involvement. Use Value: Separate fast/slow watchdog timeouts (e.g., 6.25ms / 280ms) distinguish between transient glitches and hard failures - reduces false resets. |
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 |
|---|---|---|---|
| MAX6792TPMD1+T | Identical pinout and features, but with different preset output configuration (5V/5V instead of 5V/3.3V); same windowed watchdog and HOLD logic. | Suitable where dual 5V rails are required (e.g., MCU + Ethernet PHY), not for mixed 3.3V/5V systems. | Select MAX6792TPMD1+T only if both outputs must be 5V; otherwise MAX6791TPMD1+T matches 3.3V/5V system requirements. |
| TLV70733PDQNR | Single-output, 200mA, 2.5V–5.5V input only; no watchdog, RESET, HOLD, or automotive temp grade; SOT-23-5 package. | Limited to low-voltage, non-safety-critical consumer applications; lacks supervision, reverse-battery protection, and wide VIN. | Not a functional substitute - TLV70733PDQNR cannot replace MAX6791TPMD1+T in automotive or high-reliability designs due to missing supervision and voltage range. |
Compared with MAX6792TPMD1+T (same family, dual-5V variant) and TLV70733PDQNR (low-voltage consumer LDO), MAX6791TPMD1+T uniquely combines dual 150mA outputs, 5V–72V operation, windowed watchdog, and HOLD functionality in a single AEC-Q100-aligned package - making it irreplaceable for robust automotive power sequencing.
Availability
MAX6791TPMD1+T is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and body control modules requiring stable component supply across extended temperature and high-reliability automotive programs.
Supply support for MAX6791TPMD1+T 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 watchdog, RESET, HOLD, and reverse-battery protection - optimized for ECU, BCM, and telematics systems.
FAQ
What output voltage options does the MAX6791TPMD1+T support?
The MAX6791TPMD1+T supports preset OUT1 voltages of 5V, 3.3V, 2.5V, or 1.8V (indicated by 'M' in the suffix), and a fixed 5V OUT2. Its OUT1 can also be adjusted from 1.8V to 11V using an external resistor divider connected to SET1. For MAX6791TPMD1+T, the 'M' denotes 3.3V OUT1 and 'D1' specifies a 3.125ms reset timeout period.
Does the MAX6791TPMD1+T include reverse-battery protection?
Yes, the MAX6791TPMD1+T includes integrated reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. This eliminates the need for series Schottky diodes, reducing voltage drop and power loss. The GATEP clamp voltage is 13.8V–18.8V at VIN = 20V, ensuring safe FET gate control during reverse-polarity events.
How does the HOLD function operate in the MAX6791TPMD1+T?
The HOLD pin in the MAX6791TPMD1+T is an active-low input internally pulled to OUT1 with 2µA. When driven low after initial enable, it forces OUT1/OUT2 to remain ON even if ENABLE1/ENABLE2 is subsequently pulled low - enabling self-holding ignition circuits. Releasing HOLD (high or floating) shuts down the regulator outputs, providing hardware-controlled power gating without MCU firmware dependency.
What is the watchdog timeout behavior of the MAX6791TPMD1+T?
The MAX6791TPMD1+T implements a windowed watchdog timer - unique to the MAX6791/MAX6792 variants. It asserts RESET if WDI remains static longer than tWD2 (e.g., 280ms min) OR shorter than tWD1 (e.g., 25ms for 16× ratio). This detects both stuck-high and stuck-low faults. The watchdog can be disabled via WD-DIS or WDS0/WDS1 configuration, and timeout periods are adjustable via CSWT capacitor.
Is the MAX6791TPMD1+T qualified for automotive use?
Yes, the MAX6791TPMD1+T is specified for −40°C to +125°C operation and built in a thermally enhanced TQFN-20 EP package capable of dissipating 2.7W. While the specific MAX6791TPMD1+T variant is not individually listed in AEC-Q100 reports, it belongs to the MAX6791–MAX6796 family, several members of which (e.g., MAX6795TPLD2/V+) are AEC-Q100 qualified. Its design, test flow, and packaging align with automotive reliability requirements.
MAX6791TPMD1+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.375V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 2.187ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPMD1+T FAQ
1.How can I place an order for MAX6791TPMD1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPMD1+T 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 MAX6791TPMD1+T reliable?
The price and inventory of MAX6791TPMD1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPMD1+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPMD1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPMD1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPMD1+T?
MAX6791TPMD1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPMD1+T 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 MAX6791TPMD1+T?
For technical support, including MAX6791TPMD1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPMD1+T requirements.
6.How does Aetrix verify that MAX6791TPMD1+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPMD1+T 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 MAX6791TPMD1+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPMD1+T?
All MAX6791TPMD1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPMD1+T, 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 MAX6791TPMD1+T part is unused and in its original packaging.
Return procedure for MAX6791TPMD1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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