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Analog Devices Inc./Maxim Integrated MAX6791TPYD4+T
- Part No.:
- MAX6791TPYD4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPYD4+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,750
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Product details
Overview
The MAX6791TPYD4+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 (OUT1 and OUT2), supports 5V to 72V input range, features 68μA quiescent current, and includes adjustable reset timeout (200ms), windowed watchdog timer, and HOLD/ENABLE control logic - deployed in engine control units and ADAS domain controllers.
For engineers reviewing the MAX6791TPYD4+T datasheet, MAX6791TPYD4+T pinout, MAX6791TPYD4+T application, or MAX6791TPYD4+T equivalent, key selection criteria include dual-rail regulation under load-dump conditions, AEC-Q100-relevant thermal robustness (−40°C to +125°C), fixed 5V OUT2 + adjustable OUT1 (1.8V–11V), and validated reset/watchdog timing behavior across voltage/temperature extremes.
Technical Context
The MAX6791TPYD4+T implements two independent LDO regulators: OUT1 (adjustable or preset) and OUT2 (fixed 5V), each with dedicated enable inputs (ENABLE1/ENABLE2) and shared HOLD functionality. Its supervisory block integrates a windowed watchdog timer (with selectable min/max timeout ratios via WDS0/WDS1), capacitor-adjustable reset timeout (CSRT = D4 → 200ms), and power-fail comparator (PFI/PFO) referenced to 1.231V.
It uses internal current-limited pFET gate drive (GATEP) for reverse-battery protection and features thermal shutdown (+165°C), short-circuit current limiting (240mA), and output overvoltage protection (105–110% VOUT). All specifications are fully characterized from −40°C to +125°C and qualified per AEC-Q100 stress test requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without external clamping. |
| Quiescent Current | 68μA typical - enables always-on operation in battery-sensitive systems (e.g., telematics). |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU cores, CAN transceivers, and sensor interfaces. |
| Dropout Voltage | 840mV typical at 100mA (dual mode) - maintains regulation during cold-crank (6V battery) with 5V OUT1. |
| Reset Timeout | 200ms (D4 option) - ensures reliable microcontroller initialization after brownout recovery. |
| Watchdog Type | Windowed (MAX6791-specific) - detects both stuck-high and stuck-low WDI faults, critical for ASIL-B safety monitoring. |
| Operating Temperature | −40°C to +125°C - meets under-hood automotive ambient requirements. |
Pinout & Package
MAX6791TPYD4+T is housed in a thermally enhanced 20-pin TQFN-EP package (5mm × 5mm, 0.8mm height) with exposed pad (EP) connected internally to GND for low-junction-to-board thermal resistance (supports 2.7W dissipation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Dual-mode regulator output: fixed (1.8V/2.5V/3.3V/5V) or adjustable (1.8V–11V) via SET1 divider; 150mA max. |
| 3 | SET1 | Feedback node for OUT1 - tied to GND for preset voltage; used with resistor divider for adjustable output. |
| 4 | PFO | Open-drain power-fail output - asserts low when PFI falls below 1.231V (e.g., battery sag detection). |
| 5 | CSWT | Watchdog timeout adjust - connected to OUT1 for fixed 280ms timeout; capacitor to GND enables adjustment. |
| 6 | CSRT | Reset timeout adjust - configured as D4 (200ms) per part number suffix; capacitor to GND enables other timeouts. |
| 7 | GND | Analog/digital ground reference; EP must be soldered to PCB ground plane for thermal performance. |
| 8 | RESET | Active-low push-pull reset output - asserts when OUT1 drops below threshold or watchdog fault occurs. |
| 9,10 | WDS1, WDS0 | Window ratio select inputs - set fast/slow watchdog thresholds (e.g., WDS1=H/WDS0=L disables watchdog). |
| 11 | WDI | Watchdog input - requires edge transition within tWD window; resets watchdog counter on valid toggle. |
| 12 | HOLD | Active-low hold input - keeps OUT1 enabled even after ENABLE1 goes low; enables self-holding ignition circuits. |
| 13,14 | OUT2 | Fixed 5V output - independent of OUT1; supplies secondary loads (e.g., LIN transceivers, EEPROM). |
| 15 | ENABLE2 | Active-high enable for OUT2 - internal 0.5µA pulldown allows direct microcontroller GPIO control. |
| 16 | PFI | Power-fail comparator input - biased by external resistor divider to detect battery or supply rail collapse. |
| 17,18 | IN | Main regulator input - bypassed with ≥1µF ceramic capacitor to GND; handles 72V transients. |
| 19 | GATEP | pFET gate driver - drives external high-side PMOS for reverse-battery protection (no series diode loss). |
| 20 | ENABLE1 | Active-high enable for OUT1 - internal 0.5µA pulldown enables direct MCU control without pull-down resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Enables ASIL-B-compliant fault detection by asserting RESET for both too-fast (tWDI < tWD1) and too-slow (tWDI > tWD2) WDI transitions. |
| Self-Holding Circuit Support | HOLD input eliminates need for external latching circuitry - enables ignition-key-triggered power sequencing with zero external components. |
| Reverse-Battery Protection Drive | GATEP output directly controls external pFET, removing ~0.4V diode drop and associated heat generation in 12V/24V automotive systems. |
| Capacitor-Adjustable Supervisory Timers | CSRT and CSWT pins allow field-tuning of reset and watchdog timeouts without firmware or hardware change - supports multiple vehicle platforms. |
| AEC-Q100 Qualified Thermal Robustness | Specified from −40°C to +125°C with thermal shutdown (+165°C) and hysteresis (20°C) - sustains continuous operation in under-hood environments. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Powering 32-bit MCU core, CAN FD controller, and analog front-end sensors in diesel/gasoline ECU modules. IC Role / Device Role / Timing Role: Dual-rail regulator (5V OUT2 for CAN, adjustable OUT1 for MCU I/O) with synchronized reset and watchdog supervision. Use Value: 68μA quiescent current extends battery life during key-off; 72V input tolerance survives ISO 7637-2 pulse 5a load dump. |
Use Scenario: Supplying radar SoC, camera ISP, and safety monitor IC in front-camera or surround-view domain controller. IC Role / Device Role / Timing Role: Primary power supervisor ensuring deterministic boot and runtime fault containment via windowed watchdog. Use Value: HOLD/ENABLE1 sequencing enables safe power-up of multi-rail SoC; PFI/PFO provides early warning of 12V rail collapse before system crash. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
|
Use Scenario: Regulating power for LIN transceivers, door-lock actuators, and interior lighting drivers in centralized BCM. IC Role / Device Role / Timing Role: Dual-output LDO delivering isolated 5V (OUT2) and 3.3V (OUT1) rails with independent enable control. Use Value: ENABLE2 allows software-controlled shutdown of non-critical peripherals; GATEP-driven reverse-battery protection reduces BOM cost vs. discrete diode solution. |
Use Scenario: Always-on power management for cellular modem, GNSS receiver, and secure element in LTE/5G TCU. IC Role / Device Role / Timing Role: Micropower supervisor maintaining RTC and wake-up logic while enabling rapid full-system boot on network event. Use Value: 27μA shutdown current meets OEM "parking mode" leakage budgets; 200ms reset timeout ensures modem firmware stability after brownout. |
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 |
|---|---|---|---|
| MAX6792TPYD4+T | Same pinout and electrical specs, but adds programmable window ratio via WDS0/WDS1; identical D4 reset timeout. | Preferred where fine-grained watchdog fault discrimination (e.g., ASIL-C diagnostics) is required beyond MAX6791 baseline. | Select MAX6792TPYD4+T if window ratio configurability (not just enable/disable) is needed for functional safety compliance. |
| TLV70733PDQNR | Single-output, 200mA LDO only; no watchdog, reset, PFI, or HOLD; 2.5V–5.5V input; not AEC-Q100 qualified. | Limited to non-safety, low-voltage infotainment subsystems - cannot replace MAX6791TPYD4+T in primary power domains. | Use TLV70733PDQNR only for cost-sensitive, non-automotive auxiliary rails where supervision and high-voltage operation are unnecessary. |
Compared with MAX6792TPYD4+T, the MAX6791TPYD4+T offers identical dual-regulator performance and D4 reset timing but lacks WDS0/WDS1 programmability; versus TLV70733PDQNR, it delivers full automotive-grade supervision, 72V tolerance, and dual-rail capability - making it irreplaceable in safety-critical power domains.
Availability
MAX6791TPYD4+T is available at Aetrix Electronics and suitable for automotive ECU, ADAS domain controller, body control module, telematics unit, and industrial transportation systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6791TPYD4+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 targets automotive power-supervision needs - combining ultra-low IQ, wide VIN, dual LDOs, and AEC-Q100-qualified supervision in compact TQFN packages for under-hood deployment.
FAQ
What output voltage options does the MAX6791TPYD4+T support?
The MAX6791TPYD4+T supports fixed output voltages of 1.8V, 2.5V, 3.3V, or 5.0V on OUT1, selectable by grounding SET1; OUT2 is fixed at 5V. OUT1 can also be adjusted from 1.8V to 11V using an external resistive divider connected to SET1. The "Y" in MAX6791TPYD4+T denotes a 3.3V preset for OUT1, confirmed in Maxim's ordering guide and electrical characteristics tables.
How is the 200ms reset timeout implemented in the MAX6791TPYD4+T?
The MAX6791TPYD4+T achieves its 200ms reset timeout via the D4 option encoded in the part number suffix - internally connecting CSRT to OUT1/OUT for fixed timing. This value is guaranteed across −40°C to +125°C, with typical variation <±5% per temperature data (MAX6791toc10), and requires no external capacitor unless user adjustment is needed.
Does the MAX6791TPYD4+T include reverse-battery protection?
Yes, the MAX6791TPYD4+T integrates reverse-battery protection via the 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 - critical for 12V/24V automotive systems where efficiency and thermal management are constrained.
What is the function of the HOLD pin on the MAX6791TPYD4+T?
The HOLD pin on the MAX6791TPYD4+T is an active-low input that enables self-holding behavior: once OUT1 is enabled via ENABLE1, pulling HOLD low maintains regulation even if ENABLE1 returns low. Releasing HOLD shuts down OUT1. This allows ignition-key-triggered power sequencing without external latching components - a key feature for automotive start-stop systems.
Is the MAX6791TPYD4+T AEC-Q100 qualified?
The MAX6791TPYD4+T itself is not individually listed in AEC-Q100 qualification reports; however, the MAX6795TPSD2/V+ and MAX6795TPLD2/V+ variants in the same family are explicitly AEC-Q100 qualified. The MAX6791TPYD4+T shares identical die, package, and process - and all electrical/thermal specs are fully characterized from −40°C to +125°C per AEC-Q100 environmental stress requirements.
MAX6791TPYD4+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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPYD4+T FAQ
1.How can I place an order for MAX6791TPYD4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPYD4+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 MAX6791TPYD4+T reliable?
The price and inventory of MAX6791TPYD4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPYD4+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPYD4+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPYD4+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPYD4+T?
MAX6791TPYD4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPYD4+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 MAX6791TPYD4+T?
For technical support, including MAX6791TPYD4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPYD4+T requirements.
6.How does Aetrix verify that MAX6791TPYD4+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPYD4+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 MAX6791TPYD4+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPYD4+T?
All MAX6791TPYD4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPYD4+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 MAX6791TPYD4+T part is unused and in its original packaging.
Return procedure for MAX6791TPYD4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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