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Analog Devices Inc./Maxim Integrated MAX6791TPYD0+T
- Part No.:
- MAX6791TPYD0+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPYD0+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6791TPYD0+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 active-low open-drain RESET with 87.5% reset threshold. It supports load-dump survival in vehicle battery systems.
For engineers reviewing the MAX6791TPYD0+T datasheet, MAX6791TPYD0+T pinout, MAX6791TPYD0+T application, or MAX6791TPYD0+T equivalent, key selection criteria include its dual-regulator architecture with independent ENABLE1/ENABLE2 control, HOLD-based self-holding functionality, windowed watchdog timer (MAX6791-specific), and AEC-Q100-aligned thermal robustness in automotive ECU and body-control modules.
Technical Context
The MAX6791TPYD0+T implements two independent LDO regulators: OUT1 (adjustable or preset 3.3V) and fixed 5V OUT2. Its RESET output asserts low when OUT1 drops below 87.5% of nominal (2.888V at 3.3V), with timeout periods selectable via CSRT pin (D0 = 35μs). The windowed watchdog monitors WDI transitions using WDS0/WDS1 to detect both fast (tWDI < tWD1) and slow (tWDI > tWD2) faults.
It integrates reverse-battery protection via GATEP-driven pFET, thermal shutdown at +165°C with 20°C hysteresis, and output overvoltage protection clamping at 1.05×VOUT. The HOLD input enables latch-up behavior without external components-critical for ignition-controlled power sequencing in automotive gateways.
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 applications |
| Output Current | 150mA per output - sufficient for MCU core + peripheral rail in compact ECUs |
| Dropout Voltage | 840mV typical at 100mA (dual) - maintains regulation under cold-crank conditions (VIN ≥ 6V) |
| Reset Threshold | 87.5% of VOUT1 - ensures reliable microcontroller reset before brownout (2.888V at 3.3V) |
| 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 - qualified for under-hood automotive environments |
Pinout & Package
MAX6791TPYD0+T is housed in a 20-pin, 5mm × 5mm thermally enhanced TQFN-EP package with exposed pad (EP) connected internally to GND. The package supports up to 2.7W power dissipation and enables PCB-level thermal management via direct EP-to-ground-plane connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 OUT1 | Primary regulator output | 3.3V fixed output (per Y in part number); requires ≥10μF ceramic capacitor to GND |
| 3 SET1 | Feedback reference input | Connected to GND for preset 3.3V operation; used with resistive divider for adjustable outputs |
| 4 PFO | Power-fail comparator output | Open-drain active-low signal triggered when PFI falls below 1.231V threshold |
| 5 CSWT | Watchdog timeout adjust | Connect to OUT1 for fixed 280ms timeout; capacitor to GND enables adjustment |
| 6 CSRT | Reset timeout adjust | D0 suffix indicates 35μs fixed timeout; pin tied to OUT1 in this configuration |
| 7 GND | Ground reference | Primary return path; EP must be soldered to ground plane for thermal performance |
| 8 RESET | Supervisory reset output | Active-low open-drain; asserts when OUT1 < 2.888V and holds for 35μs after recovery |
| 9 WDS1 | Watchdog window ratio select | Used with WDS0 to configure MIN/MAX watchdog window (e.g., ratio = 8, 16, or 64) |
| 10 WDS0 | Watchdog window ratio select | Together with WDS1, selects fast/slow fault detection thresholds per MAX6791 windowed mode |
| 11 WDI | Watchdog input | Edge-sensitive; transition required within tWD2 (max 520ms) to prevent reset assertion |
| 12 HOLD | Regulator hold enable | Active-low; latches ON state even after ENABLE1 goes low - enables ignition-key hold circuits |
| 13,14 OUT2 | Secondary regulator output | Fixed 5V output; independent of OUT1; requires ≥10μF capacitor to GND |
| 15 ENABLE2 | OUT2 enable control | Active-high; internal 0.5μA pulldown allows direct MCU GPIO drive without pull-down resistor |
| 16 PFI | Power-fail comparator input | Resistive divider sets custom undervoltage warning threshold referenced to 1.231V |
| 17,18 IN | Main input supply | Bypassed with 1μF capacitor to GND; handles 72V transients with internal clamp |
| 19 GATEP | pFET gate driver | Drives external p-channel MOSFET for reverse-battery protection - eliminates series diode loss |
| 20 ENABLE1 | OUT1 enable control | Active-high; internal 0.5μA pulldown simplifies interface with 3.3V logic or microcontroller pins |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Simultaneously detects fast (tWDI < tWD1) and slow (tWDI > tWD2) WDI faults - prevents false resets from noise or firmware hangs |
| HOLD-based self-holding | Eliminates need for external latch circuitry; enables ignition-switched power with zero-component hold function |
| Reverse-battery protection | GATEP output drives pFET to block -14V reverse polarity - replaces lossy series diode in battery feed |
| Thermal & short-circuit protection | +165°C shutdown with 20°C hysteresis and 240mA short-circuit limit - sustains operation during transient overloads |
| AEC-Q100 alignment | Qualified per AEC-Q100 Rev H stress testing (temperature, humidity, vibration) - suitable for automotive production |
Applications
| Body Control Module (BCM) | Advanced Driver Assistance Systems (ADAS) Camera ECU |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interfaces in door module or lighting controller. IC Role / Device Role / Timing Role: Dual-rail regulator supplying 3.3V for MCU core/logic and 5V for analog sensors and LIN transceivers. Use Value: 68μA quiescent current minimizes battery drain during sleep; HOLD input enables wake-on-LIN without external latching. | Use Scenario: Power management for front-facing ADAS camera with image sensor, ISP, and Ethernet PHY. IC Role / Device Role / Timing Role: Primary supervisor providing 3.3V for ISP and 5V for Ethernet PHY, with watchdog monitoring ISP firmware execution. Use Value: Windowed watchdog detects both frozen and excessively rapid WDI toggling - critical for fail-safe camera operation. |
| Engine Control Unit (ECU) Subsystem | Automotive Infotainment Head Unit |
Use Scenario: Secondary power rail for diagnostic interface, EEPROM, and real-time clock in engine management system. IC Role / Device Role / Timing Role: Regulator + supervisor delivering stable 3.3V/5V while monitoring main ECU supply via PFI input. Use Value: PFI comparator provides early warning of battery sag before main rail collapse - enables graceful shutdown of non-critical subsystems. | Use Scenario: Powering audio DSP, touch controller, and display backlight drivers in head unit with always-on capability. IC Role / Device Role / Timing Role: Dual-output regulator with HOLD latching to maintain 3.3V/5V rails during ignition-off but retained accessory mode. Use Value: 72V input tolerance survives jump-start transients; thermal enhancement sustains 150mA loads at +105°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPYD0+T | Identical pinout, same 3.3V/5V outputs and D0 reset timeout, but includes programmable window ratio (SET/SET1) for finer watchdog tuning | Preferred where adaptive watchdog timing is needed for variable firmware loop durations | Select MAX6792TPYD0+T if window ratio configurability is required; otherwise MAX6791TPYD0+T offers identical baseline supervision |
| TLV70733PDQNR | Single 3.3V LDO only (no dual output, no watchdog, no RESET), 200mA, 5.5V max input, SOT-23-5 package | Limited to low-voltage, non-supervised applications - cannot replace full supervisory function set | Only consider TLV70733PDQNR for cost-sensitive, non-automotive, single-rail designs lacking supervision requirements |
Compared with MAX6792TPYD0+T, the MAX6791TPYD0+T provides identical regulation, reset, and hold functionality but lacks SET/SET1-adjustable window ratio - making it optimal for fixed-timing watchdog use cases. Unlike TLV70733PDQNR, it delivers full dual-rail, high-voltage, and AEC-aligned supervision essential for automotive deployment.
Availability
MAX6791TPYD0+T is available at Aetrix Electronics and suitable for automotive electronic control units, ADAS camera modules, and body electronics requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6791TPYD0+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 supervision, integrating high-input-voltage regulation, dual outputs, windowed watchdog, and reverse-battery protection into a single AEC-Q100-aligned device.
FAQ
What output voltage does the MAX6791TPYD0+T provide?
The MAX6791TPYD0+T provides two regulated outputs: OUT1 is fixed at 3.3V (indicated by 'Y' in the part number), and OUT2 is fixed at 5V. Both outputs are independently controllable via ENABLE1 and ENABLE2 inputs, and OUT1 uses the SET1 pin grounded for preset operation - no external feedback resistors required.
Does the MAX6791TPYD0+T support reverse-battery protection?
Yes, the MAX6791TPYD0+T supports reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. This eliminates the power loss and board space associated with traditional series diodes, enabling efficient protection against -14V reverse polarity events commonly encountered in automotive battery connections.
What is the function of the HOLD pin on the MAX6791TPYD0+T?
The HOLD pin on the MAX6791TPYD0+T is an active-low input that enables self-holding behavior: once ENABLE1 turns on OUT1, pulling HOLD low latches the regulator ON even if ENABLE1 subsequently goes low. Releasing HOLD (pulling high or leaving open) shuts down OUT1 - allowing ignition-key-based power sequencing without external latch components.
How is the reset timeout period configured on the MAX6791TPYD0+T?
The MAX6791TPYD0+T uses the D0 suffix to indicate a fixed 35μs reset timeout period. This is implemented internally - the CSRT pin is tied to OUT1 in production configuration. No external capacitor is required, and the 35μs duration ensures fast, deterministic reset deassertion after supply recovery, critical for time-sensitive automotive MCUs.
Is the MAX6791TPYD0+T qualified for automotive use?
Yes, the MAX6791TPYD0+T is designed for automotive environments and operates across -40°C to +125°C. While the specific variant MAX6791TPYD0+T is not individually listed in AEC-Q100 reports, it belongs to the MAX6791–MAX6796 family whose qualification (e.g., MAX6795TPLD2/V+) confirms compliance with AEC-Q100 Rev H stress testing - supporting its use in production automotive systems.
MAX6791TPYD0+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:
- 35µs Typical
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPYD0+T FAQ
1.How can I place an order for MAX6791TPYD0+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPYD0+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 MAX6791TPYD0+T reliable?
The price and inventory of MAX6791TPYD0+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPYD0+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPYD0+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPYD0+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPYD0+T?
MAX6791TPYD0+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPYD0+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 MAX6791TPYD0+T?
For technical support, including MAX6791TPYD0+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPYD0+T requirements.
6.How does Aetrix verify that MAX6791TPYD0+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPYD0+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 MAX6791TPYD0+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPYD0+T?
All MAX6791TPYD0+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPYD0+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 MAX6791TPYD0+T part is unused and in its original packaging.
Return procedure for MAX6791TPYD0+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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