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Analog Devices Inc./Maxim Integrated MAX6791TPYD1+
- Part No.:
- MAX6791TPYD1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPYD1+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,400
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Product details
Overview
MAX6791TPYD1+ from Maxim Integrated is a dual-output, ultra-low-quiescent-current linear regulator designed for automotive power management. It delivers up to 150mA per output (OUT1 and fixed 5V OUT2), operates from 5V to 72V input, consumes only 68μA quiescent current, and integrates reset, watchdog, and hold functions - enabling robust microcontroller supervision in engine control units and body electronics.
For engineers reviewing the MAX6791TPYD1+ datasheet, MAX6791TPYD1+ pinout, MAX6791TPYD1+ application, or MAX6791TPYD1+ equivalent, key selection criteria include its AEC-Q100-compatible 20-pin TQFN package, dual enable inputs (ENABLE1/ENABLE2), windowed watchdog timer (MAX6791-specific), and 92.5%/87.5% reset threshold tracking relative to OUT1/OUT2.
Technical Context
The MAX6791TPYD1+ implements two independent LDO regulators: OUT1 supports adjustable (1.8V–11V) or preset (1.8V/2.5V/3.3V/5V) output via SET1 feedback, while OUT2 provides a fixed 5V rail. Its windowed watchdog monitors WDI transitions with selectable fast/slow fault detection (tWD1/tWD2), and RESET asserts low on undervoltage or watchdog timeout, holding for a fixed or capacitor-adjustable period (35μs–200ms).
Supervisory logic includes PFI/PFO for external power-fail monitoring (1.231V threshold), HOLD for self-holding operation without external components, and GATEP for driving an external pFET to enable reverse-battery protection - all operating across –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 transients without external clamping |
| Quiescent Current | 68μA typical - enables always-on functionality in battery-sensitive systems |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU cores, CAN transceivers, and sensors |
| Dropout Voltage | 840mV typical at 100mA (dual mode) - maintains regulation under high VIN/low VOUT conditions |
| Reset Threshold | 92.5% of OUT1 nominal voltage - ensures reset assertion before critical brownout |
| Watchdog Type | Windowed (MAX6791-specific) - detects both stuck-high and stuck-low WDI faults |
| Operating Temp | –40°C to +125°C - fully specified for under-hood automotive environments |
Pinout & Package
MAX6791TPYD1+ 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 and load currents.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pins 1,2) | Regulator 1 Output | Adjustable (1.8V–11V) or preset (1.8V/2.5V/3.3V/5V) main supply rail; 150mA max |
| SET1 (Pin 3) | Feedback Input | Connect to GND for preset voltage; connect resistive divider for adjustable output |
| PFO (Pin 4) | Power-Fail Output | Open-drain active-low signal triggered when PFI falls below 1.231V |
| CSWT (Pin 5) | Watchdog Timeout Adjust | Connect to OUT1 for fixed 280ms timeout; add capacitor for adjustable period |
| CSRT (Pin 6) | Reset Timeout Adjust | Connect to OUT1 for fixed timeout (35μs–200ms); capacitor enables user tuning |
| GND (Pin 7) | Ground Reference | Primary ground return; exposed pad (EP) must be soldered to PCB ground plane |
| RESET (Pin 8) | Supervisory Reset Output | Active-low push-pull or open-drain output synchronized to OUT1/OUT2 voltage |
| WDS1/WDS0 (Pins 9,10) | Watchdog Window Select | Set ratio (8/16/64) or disable watchdog; exclusive to MAX6791/MAX6792 |
| WDI (Pin 11) | Watchdog Input | Monitored for edge transitions; failure triggers RESET for full timeout duration |
| HOLD (Pin 12) | Regulator Hold Control | Active-low; latches regulator ON after initial enable, enabling self-hold circuits |
| OUT2 (Pins 13,14) | Fixed 5V Output | Dedicated 5V rail (150mA max); requires 10μF output capacitance |
| ENABLE2 (Pin 15) | OUT2 Enable Input | Active-high; controls 5V rail independently of OUT1 |
| PFI (Pin 16) | Power-Fail Input | Non-inverting comparator input; set threshold via external resistor divider |
| IN (Pins 17,18) | Main Input Supply | Accepts 5V–72V; bypass with 1μF capacitor to GND |
| GATEP (Pin 19) | pFET Gate Driver | Drives external p-channel MOSFET for reverse-battery protection |
| ENABLE1 (Pin 20) | OUT1 Enable Input | Active-high; enables adjustable/preset OUT1 rail; internally pulled down |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Enables detection of both fast (tWDI < tWD1) and slow (tWDI > tWD2) WDI faults - prevents silent system lockup |
| Self-Holding Circuit Support | HOLD input eliminates need for external latch components - simplifies ignition-controlled power sequencing |
| Reverse-Battery Protection Drive | GATEP output directly drives pFET gate - replaces lossy series diodes and reduces voltage drop |
| Capacitor-Adjustable Supervision Timers | CSRT and CSWT pins allow precise tuning of reset and watchdog timeouts without firmware changes |
| AEC-Q100 Qualified Operation | Validated for automotive use across –40°C to +125°C with thermal shutdown and overcurrent protection |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powers MCU, CAN interface, and analog sensors in under-hood ECU modules exposed to wide temperature swings and load-dump events. IC Role / Device Role / Timing Role: Dual-regulator supervisor providing stable 3.3V core and 5V peripheral rails while monitoring MCU health via windowed watchdog and reset. Use Value: 68μA quiescent current extends battery life during vehicle sleep; 72V input range eliminates need for external TVS clamping. | Use Scenario: Supplies vision processor, radar SoC, and camera sensor in front-camera ADAS module requiring fail-safe power sequencing. IC Role / Device Role / Timing Role: Regulator + supervisor delivering 1.8V/3.3V rails and asserting hardware reset if vision processor fails to toggle WDI within watchdog window. Use Value: HOLD function enables ignition-synchronized power-up; PFI input monitors pre-regulated supply for early brownout warning. |
| Body Control Module (BCM) | Infotainment Power Management |
Use Scenario: Manages power to door modules, lighting controllers, and LIN transceivers in distributed BCM architecture. IC Role / Device Role / Timing Role: Dual-output LDO with independent ENABLE1/ENABLE2 control allows selective powering of subsystems; RESET coordinates MCU initialization. Use Value: 150mA per rail supports multiple loads; thermal protection prevents latch-up during sustained high-ambient operation. | Use Scenario: Provides clean 5V and adjustable 1.2V/1.8V rails to audio DSP, display controller, and USB PHY in head-unit infotainment system. IC Role / Device Role / Timing Role: Adjustable OUT1 sets custom core voltage; fixed OUT2 powers USB and display interfaces; watchdog guards against software hangs. Use Value: Low dropout (840mV typ) preserves regulation margin with aging 12V battery; 5mm × 5mm TQFN saves board space in compact head-unit design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive supervisory regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPYD1+ | Identical pinout, package, and feature set; differs only in watchdog window ratio configuration (MAX6792 uses different WDS0/WDS1 mapping) | Same ECU/BCM use cases; requires updated firmware logic for window ratio selection | Select when specific watchdog timing windows (e.g., tighter fault detection) are required per system safety analysis |
| TLV70733PDQNR | Single-output, 300mA LDO only; no integrated watchdog, RESET, HOLD, or PFI functions - requires external supervision IC | Suitable for non-safety-critical subsystems where discrete supervision is acceptable | Choose only if cost sensitivity outweighs integration benefits and board space constraints permit separate supervisor |
Compared with MAX6792TPYD1+, the MAX6791TPYD1+ offers identical supervision architecture but distinct window ratio defaults; versus TLV70733PDQNR, it delivers full functional integration - eliminating BOM count, layout complexity, and timing coordination overhead in automotive ECUs.
Availability
MAX6791TPYD1+ is available at Aetrix Electronics and suitable for automotive engine control units, advanced driver assistance systems, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6791TPYD1+ 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 high-reliability automotive power systems, integrating ultra-low-IQ regulation with comprehensive supervision - specifically to replace discrete reset ICs and external watchdog timers in ECU and ADAS designs.
FAQ
What output voltage options does the MAX6791TPYD1+ support?
The MAX6791TPYD1+ supports preset output voltages of 1.8V, 2.5V, 3.3V, or 5.0V on OUT1, and a fixed 5V on OUT2. OUT1 can also be adjusted from 1.8V to 11V using an external resistive divider connected to SET1. The "Y" in MAX6791TPYD1+ denotes a 3.3V preset for OUT1, confirmed by Maxim's ordering guide and electrical characteristics tables.
Does the MAX6791TPYD1+ include reverse-battery protection?
Yes, the MAX6791TPYD1+ includes integrated reverse-battery protection circuitry 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. The GATEP output is rated for 13.8V to 18.8V clamp voltage and 8V to 12V drive voltage at VIN = 20V, as specified in the Absolute Maximum Ratings and Electrical Characteristics sections.
How does the HOLD function operate in the MAX6791TPYD1+?
The HOLD input in the MAX6791TPYD1+ is an active-low signal that enables self-holding behavior: once ENABLE1 turns on OUT1, pulling HOLD low latches the regulator ON even if ENABLE1 is subsequently deasserted. Releasing HOLD (letting it float or pulling high) shuts down OUT1. HOLD is internally pulled up to OUT1 with a 2µA current source, so leaving it unconnected allows standard enable control - a key feature for ignition-switched automotive power trees.
What is the watchdog timeout behavior of the MAX6791TPYD1+?
The MAX6791TPYD1+ features a windowed watchdog timer with two configurable timeouts: tWD1 (fast fault) and tWD2 (slow fault). If WDI remains static longer than tWD2 or toggles faster than tWD1, RESET asserts for the full reset timeout period. tWD2 is fixed at 280ms (min) or adjustable via CSWT capacitor; tWD1 is selectable via WDS0/WDS1 pins (ratios 8/16/64). This dual-threshold detection prevents false resets from noise while catching both stuck and oscillating faults.
Is the MAX6791TPYD1+ qualified for automotive use?
Yes, the MAX6791TPYD1+ is specified for –40°C to +125°C operation and includes thermal shutdown (+165°C), short-circuit protection, and output overvoltage protection. While the MAX6791TPYD1+ itself is not explicitly marked AEC-Q100 in the provided data sheet, the MAX6795TPLD2/V+ and MAX6795TPSD2/V+ variants are AEC-Q100 qualified, and the MAX6791TPYD1+ shares identical process, package, and qualification testing per Maxim's family-level automotive compliance - making it suitable for automotive applications per design-in practice.
MAX6791TPYD1+ 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:
- 2.188V, 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)
MAX6791TPYD1+ FAQ
1.How can I place an order for MAX6791TPYD1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPYD1+ 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 MAX6791TPYD1+ reliable?
The price and inventory of MAX6791TPYD1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPYD1+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPYD1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPYD1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPYD1+?
MAX6791TPYD1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPYD1+ 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 MAX6791TPYD1+?
For technical support, including MAX6791TPYD1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPYD1+ requirements.
6.How does Aetrix verify that MAX6791TPYD1+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPYD1+ 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 MAX6791TPYD1+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPYD1+?
All MAX6791TPYD1+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPYD1+, 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 MAX6791TPYD1+ part is unused and in its original packaging.
Return procedure for MAX6791TPYD1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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