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Analog Devices Inc./Maxim Integrated MAX6791TPYD3+T
- Part No.:
- MAX6791TPYD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPYD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,287
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Product details
Overview
MAX6791TPYD3+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 (this variant: 3.3V), and a 50ms capacitor-adjustable reset timeout - enabling robust microcontroller reset control in engine control units.
For engineers reviewing the MAX6791TPYD3+T datasheet, MAX6791TPYD3+T pinout, MAX6791TPYD3+T application, or MAX6791TPYD3+T equivalent, key selection criteria include its AEC-Q100-compatible 20-pin TQFN package, dual enable inputs (ENABLE1/ENABLE2), HOLD self-hold functionality, windowed watchdog timer (MAX6791-specific), and 87.5% reset threshold for OUT1 - all validated for -40°C to +125°C operation.
Technical Context
The MAX6791TPYD3+T implements two independent LDO regulators: OUT1 (adjustable or preset 3.3V) and OUT2 (fixed 5V), each with dedicated enable inputs and shared supervisory circuitry. Its windowed watchdog timer uses WDS0/WDS1 to select fast/slow fault detection thresholds (tWD1/tWD2), distinct from standard timeout-only watchdogs.
Supervision includes a push-pull or open-drain RESET output asserting low when OUT1 drops below 87.5% of nominal (3.3V → 2.888V min), holding low for 50ms after recovery; CSRT pin configures this timeout, while CSWT sets watchdog period. HOLD input enables latch-up behavior without external components.
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 systems (e.g., CAN wake-up circuits) with minimal battery drain. |
| Output Current | 150mA per output (OUT1 & OUT2) - supports dual-rail MCU peripherals like ADCs and communication interfaces. |
| Output Voltage | Preset 3.3V on OUT1 (±1.2% over temp), fixed 5V on OUT2 - eliminates external feedback resistors for standard logic rails. |
| Reset Threshold | 87.5% of OUT1 nominal (2.888V min at 3.3V) - ensures reliable µP reset before logic-level violation. |
| Reset Timeout | 50ms (D3 setting via CSRT) - meets automotive brownout recovery timing requirements per ISO 16750-2. |
| Watchdog Type | Windowed (MAX6791-specific) - detects both stuck-high and stuck-low WDI faults, critical for safety-critical firmware monitoring. |
Pinout & Package
MAX6791TPYD3+T is housed in a thermally enhanced 20-pin TQFN-EP package (5mm × 5mm, 0.5mm pitch) with exposed pad (EP) connected internally to GND for optimal thermal dissipation (2.7W capability).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | 3.3V regulated output (preset); requires ≥10μF ceramic capacitor to GND for stability. |
| 3 | SET1 | Feedback node tied to GND for 3.3V preset mode; connects to resistor divider for adjustable outputs. |
| 4 | PFO | Open-drain power-fail output asserting low when PFI < 1.231V - used for early battery-low warning. |
| 5 | CSWT | Watchdog timeout adjust input; grounded or capacitor-connected to set tWD (280ms fixed or adjustable). |
| 6 | CSRT | Reset timeout adjust input; configured for D3 (50ms) in this variant - defines RESET pulse duration. |
| 7 | GND | Power and signal reference plane; EP pad must be soldered to PCB ground plane for thermal performance. |
| 8 | RESET | Active-low push-pull reset output synchronized to OUT1 voltage and watchdog events. |
| 9,10 | WDS1, WDS0 | Watchdog window ratio select inputs; define tWD1/tWD2 thresholds for fast/slow fault detection. |
| 11 | WDI | Watchdog input requiring periodic edge transitions; failure triggers RESET for CSRT-defined duration. |
| 12 | HOLD | Active-low latch enable; forces OUT1/OUT2 ON even after ENABLE1/ENABLE2 removal - enables ignition-key hold circuits. |
| 13,14 | OUT2 | Fixed 5V output (150mA max); independent of OUT1 regulation and enable control. |
| 15 | ENABLE2 | Active-high enable for OUT2 only; internal 0.5μA pulldown allows direct MCU GPIO control. |
| 16 | PFI | Power-fail comparator input; threshold set by external resistor divider referenced to 1.231V internal reference. |
| 17,18 | IN | Main input supply (5–72V); bypassed with 1μF ceramic capacitor to GND near pins. |
| 19 | GATEP | pFET gate driver for reverse-battery protection - eliminates series diode voltage drop and heat. |
| 20 | ENABLE1 | Active-high enable for OUT1 only; internal 0.5μA pulldown supports direct microcontroller interface. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Enables detection of both frozen (slow) and oscillating (fast) WDI faults - required for ASIL-B software monitoring compliance. |
| Dual independent enable inputs | Allows separate sequencing of 3.3V (OUT1) and 5V (OUT2) rails - essential for mixed-voltage MCU subsystems with staggered power-up. |
| HOLD self-hold circuit | Eliminates need for external latching hardware in ignition-switched applications - reduces BOM count and board area. |
| Reverse-battery protection drive (GATEP) | Directly controls external pFET to block reverse polarity without 0.3–0.7V diode drop - preserves system efficiency and thermal margin. |
| AEC-Q100 qualified | Validated for automotive temperature (-40°C to +125°C), ESD (HBM 2kV), and lifetime reliability - suitable for under-hood ECUs. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) Camera Module |
|---|---|
|
Use Scenario: Powers 3.3V MCU core and 5V image sensor interface in diesel/gasoline engine controllers exposed to 72V load-dump transients. IC Role / Device Role / Timing Role: Dual-output LDO with HOLD-latched enable provides always-on wake-up capability and synchronized reset during cranking/brownout. Use Value: 68μA quiescent current extends battery life in parked state; 72V input tolerance avoids external TVS/clamp components. |
Use Scenario: Supplies 3.3V ISP and 5V CMOS image sensor in rear-view camera modules operating in high-temperature cabin environments. IC Role / Device Role / Timing Role: Regulator with windowed watchdog monitors ISP firmware execution and asserts RESET on hang or clock fault. Use Value: 50ms reset timeout ensures clean processor restart before image pipeline corruption; thermal shutdown protects against enclosed housing overheating. |
| Automotive Body Control Module (BCM) | Telematics Control Unit (TCU) |
|
Use Scenario: Powers 3.3V CAN transceiver and 5V LIN gateway in door module electronics subjected to cold-crank (5V) and jump-start (72V) conditions. IC Role / Device Role / Timing Role: Dual enable inputs allow independent control of CAN (OUT1) and LIN (OUT2) rails during sleep/wake transitions. Use Value: PFI comparator monitors battery voltage to trigger orderly shutdown before deep discharge; GATEP drives reverse-protection FET. |
Use Scenario: Provides primary 3.3V rail for cellular modem and secondary 5V rail for GPS receiver in always-connected vehicle hotspots. IC Role / Device Role / Timing Role: RESET output tied to modem's nRESET pin ensures deterministic recovery after power interruption or watchdog timeout. Use Value: 20-pin TQFN package fits space-constrained telematics designs; AEC-Q100 qualification satisfies OEM functional safety requirements. |
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 |
|---|---|---|---|
| MAX6792TPYD3+T | Same pinout and features, but with windowed watchdog using different WDS0/WDS1 mapping (ratio 16 vs. 8 for tWD1). | Requires updated firmware watchdog toggle timing; identical thermal and electrical specs. | Select MAX6792TPYD3+T only if existing design uses 16× window ratio - otherwise MAX6791TPYD3+T is drop-in. |
| TLV70733PDQNR | Single-output 3.3V LDO (300mA), no watchdog, no HOLD, 2.5–5.5V input only - lacks automotive HV and supervision. | Only suitable for post-regulated 5V domains; cannot replace MAX6791TPYD3+T in direct battery-fed applications. | Use TLV70733PDQNR only in non-automotive, low-voltage auxiliary rails where supervision is handled externally. |
Compared with MAX6792TPYD3+T, the MAX6791TPYD3+T offers tighter fast-fault detection (8× window ratio), while TLV70733PDQNR trades supervision and HV capability for lower cost and smaller footprint in non-critical applications.
Availability
MAX6791TPYD3+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, body control modules, and telematics control units requiring stable component supply across extended temperature and high-reliability environments.
Supply support for MAX6791TPYD3+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 family was engineered specifically for automotive power-supply supervision, integrating dual LDOs, windowed watchdogs, HOLD latching, and reverse-battery protection into a single AEC-Q100-qualified device.
FAQ
What output voltage does the MAX6791TPYD3+T provide?
The MAX6791TPYD3+T provides a preset 3.3V output on OUT1 (with ±1.2% accuracy over -40°C to +125°C) and a fixed 5V output on OUT2. The "Y" in the part number denotes the 3.3V option, and the "D3" suffix specifies a 50ms reset timeout period. This configuration eliminates external feedback components for standard logic rails while maintaining tight regulation under load and temperature variation.
How does the HOLD function work on the MAX6791TPYD3+T?
The HOLD input on the MAX6791TPYD3+T is an active-low signal that latches the regulator ON after initial enable. When ENABLE1 is asserted and then removed, pulling HOLD low maintains OUT1/OUT2 operation - enabling ignition-key-based self-holding circuits without external components. Releasing HOLD (to high or open) shuts down both outputs. HOLD is internally pulled up to OUT1 with a 2μA current source, simplifying interface design.
Is the MAX6791TPYD3+T compatible with reverse-battery protection?
Yes, the MAX6791TPYD3+T integrates reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. When battery polarity is reversed, the IC disables the FET to block current flow - eliminating the power loss and heat generation of series diodes. This feature is fully operational across the full -40°C to +125°C temperature range and supports high-side protection topologies.
What watchdog timeout options does the MAX6791TPYD3+T support?
The MAX6791TPYD3+T supports both fixed and adjustable watchdog timeout periods. Its windowed watchdog uses WDS0/WDS1 to select ratios (e.g., 8× for tWD1 = 50ms), with CSWT configurable for fixed 280ms (min) or capacitor-adjusted timing. Unlike basic watchdogs, it detects both slow (tWDI > tWD2) and fast (tWDI < tWD1) faults - critical for detecting firmware hangs or oscillator failures in safety-critical automotive software.
Does the MAX6791TPYD3+T meet automotive qualification standards?
Yes, the MAX6791TPYD3+T is AEC-Q100 qualified (Grade 0: -40°C to +125°C ambient), with full characterization across temperature, voltage, and lifetime stress tests. It includes thermal shutdown (+165°C), short-circuit protection, and output overvoltage protection - meeting ISO 16750-2 for automotive electrical load-dump and cold-crank immunity. The "V+" suffix in alternate variants explicitly denotes automotive qualification.
MAX6791TPYD3+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:
- 2.188V, 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)
MAX6791TPYD3+T FAQ
1.How can I place an order for MAX6791TPYD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPYD3+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 MAX6791TPYD3+T reliable?
The price and inventory of MAX6791TPYD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPYD3+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPYD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPYD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPYD3+T?
MAX6791TPYD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPYD3+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 MAX6791TPYD3+T?
For technical support, including MAX6791TPYD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPYD3+T requirements.
6.How does Aetrix verify that MAX6791TPYD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPYD3+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 MAX6791TPYD3+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPYD3+T?
All MAX6791TPYD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPYD3+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 MAX6791TPYD3+T part is unused and in its original packaging.
Return procedure for MAX6791TPYD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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