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Analog Devices Inc./Maxim Integrated MAX6791TPSD3+
- Part No.:
- MAX6791TPSD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPSD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,825
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Product details
Overview
MAX6791TPSD3+ from Maxim Integrated is a dual-output, ultra-low-quiescent-current linear regulator with integrated supervisory functions, designed for automotive power management. It delivers up to 150mA per output (OUT1 = 3.3V fixed, OUT2 = 5V fixed), operates from 5V to 72V input, consumes only 68µA quiescent current, and features a 50ms capacitor-adjustable reset timeout period. It is used in engine control units (ECUs) and body control modules requiring robust brownout protection and watchdog supervision.
For engineers reviewing the MAX6791TPSD3+ datasheet, MAX6791TPSD3+ pinout, MAX6791TPSD3+ application, or MAX6791TPSD3+ equivalent, key selection criteria include its dual 3.3V/5V outputs, AEC-Q100-compatible thermal performance (−40°C to +125°C), windowed watchdog timer (selectable via WDS0/WDS1), HOLD self-holding functionality, and 20-pin TQFN-EP package with exposed pad for thermal dissipation.
Technical Context
The MAX6791TPSD3+ implements two independent LDO regulators: OUT1 is factory-set to 3.3V (±2.5% over temperature), OUT2 is fixed at 5V (±2.5%). Its reset circuit monitors OUT1 voltage with an 87.5% threshold (2.888V nominal) and asserts active-low RESET for exactly 50ms after recovery - configured via CSRT = D3 code. The watchdog uses a windowed architecture (tWD1/tWD2) with selectable ratios via WDS0/WDS1 pins, enabling detection of both fast and slow microcontroller faults.
It integrates reverse-battery protection via GATEP-driven pFET control, thermal shutdown at +165°C with 20°C hysteresis, and output overvoltage protection clamping at 105–110% of VOUT. ENABLE1 and ENABLE2 allow independent regulation control, while HOLD enables self-latching behavior without external components - critical for ignition-switched automotive subsystems.
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 ECU subsystems with minimal battery drain. |
| Output Voltages | OUT1 = 3.3V fixed (±2.5%), OUT2 = 5V fixed (±2.5%) - powers MCU cores and peripherals simultaneously. |
| Reset Timeout | 50ms (D3 code) - ensures reliable µP initialization after brownout recovery. |
| Watchdog Type | Windowed (MIN/MAX) - detects both stuck-high and stuck-low WDI faults, not just timeout. |
| Thermal Protection | +165°C shutdown with 20°C hysteresis - sustains operation in under-hood environments. |
| Package | 20-pin TQFN-EP (5mm × 5mm) - exposes thermal pad for 2.7W continuous dissipation at +70°C ambient. |
Pinout & Package
MAX6791TPSD3+ is housed in a 20-pin thermally enhanced TQFN-EP (5mm × 5mm) with exposed pad (EP) connected internally to GND. The package supports up to 2.7W power dissipation and is qualified for −40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | 3.3V regulated output (150mA max); requires ≥10µF ceramic bypass to GND. |
| 3 | SET1 | Feedback input; tied to GND for 3.3V preset mode; connects to resistive divider for adjustable outputs. |
| 4 | PFO | Active-low open-drain power-fail output; asserts when PFI < 1.231V (e.g., battery sag). |
| 5 | CSWT | Watchdog timeout adjust; connected to OUT1 for fixed 280ms timeout or capacitor for adjustment. |
| 6 | CSRT | Reset timeout adjust; D3 code selects 50ms fixed timeout (no capacitor needed). |
| 7 | GND | Analog/digital ground reference; must connect EP pad to PCB ground plane. |
| 8 | RESET | Active-low push-pull reset output; asserts during OUT1 undervoltage or watchdog fault. |
| 9,10 | WDS1, WDS0 | Watchdog window ratio select inputs; set MIN/MAX timing thresholds (e.g., 8×, 16×, 64×). |
| 11 | WDI | Watchdog input; rising/falling edge must occur within tWD1–tWD2 window to avoid reset. |
| 12 | HOLD | Active-low hold enable; forces OUT1 ON even after ENABLE1 goes low - enables self-hold circuits. |
| 13,14 | OUT2 | Fixed 5V output (150mA max); powers CAN transceivers, sensors, or logic rails. |
| 15 | ENABLE2 | Active-high enable for OUT2; internal 0.5µA pulldown allows direct MCU GPIO control. |
| 16 | PFI | Power-fail comparator input; use resistive divider to set custom brownout threshold (e.g., 12V battery low). |
| 17,18 | IN | Main input (5–72V); bypass with ≥1µF ceramic capacitor close to pins. |
| 19 | GATEP | pFET gate driver; drives external high-side p-channel MOSFET for reverse-battery protection. |
| 20 | ENABLE1 | Active-high enable for OUT1; internal 0.5µA pulldown enables direct MCU control without pull-down resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | 3.3V/150mA + 5V/150mA outputs eliminate need for second regulator IC in ECU designs. |
| Windowed watchdog timer | Simultaneously detects microcontroller lockup (slow WDI) and spurious noise (fast WDI) - reduces false resets. |
| HOLD self-holding function | Enables ignition-key-triggered latching without external latch IC or discrete components - saves board space and BOM cost. |
| Reverse-battery protection drive | GATEP output directly controls pFET to block −12V reverse polarity - removes series diode losses and heat. |
| AEC-Q100-compliant thermal design | Rated for −40°C to +125°C with 2.7W thermal dissipation in 5mm × 5mm TQFN - meets under-hood requirements. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powers 32-bit MCU core (3.3V) and CAN FD transceiver (5V) from 12V battery under load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Dual-output LDO with reset supervision and watchdog - provides clean, sequenced power and fault detection for safety-critical firmware execution. Use Value: 68µA quiescent current prevents battery drain during vehicle sleep mode; 72V input tolerance avoids external TVS/clamp circuits. |
Use Scenario: Supplies door module MCU, LIN transceiver, and LED drivers in passenger compartment with ignition-switched enable. IC Role / Device Role / Timing Role: Regulator + supervisor with HOLD latching - enables "key-off" retention of memory and sensor wake-up state without auxiliary power rail. Use Value: HOLD function eliminates external latching circuitry; PFI comparator triggers orderly shutdown before battery falls below 10.5V. |
| Advanced Driver Assistance System (ADAS) Camera ECU | Electric Power Steering (EPS) Controller |
Use Scenario: Powers image signal processor (3.3V) and serializer (5V) in rear-view camera module exposed to under-hood temperatures. IC Role / Device Role / Timing Role: High-temp LDO with thermal shutdown and watchdog - ensures fail-safe power delivery during extended operation at +105°C ambient. Use Value: 2.7W thermal capability in 5mm × 5mm package supports continuous 150mA loads without derating; windowed watchdog prevents false resets from EMI. |
Use Scenario: Supplies motor control MCU and gate driver bias in EPS system where reverse-battery events are common during jump-starts. IC Role / Device Role / Timing Role: Reverse-battery protected dual LDO with reset supervision - maintains MCU operation while blocking −12V transients via GATEP-driven pFET. Use Value: Integrated GATEP driver replaces discrete pFET + level-shifter; eliminates 0.5V forward drop and associated heat of Schottky diode solution. |
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 |
|---|---|---|---|
| MAX6792TPSD3+ | Same pinout and electrical specs, but includes windowed watchdog with wider timing ratio options (64×) and higher accuracy SET threshold (1.2315V vs. 1.231V). | Preferred for systems requiring tighter watchdog timing margins or higher precision reset threshold tracking over temperature. | Select MAX6792TPSD3+ if windowed watchdog ratio flexibility beyond 16× is required; otherwise MAX6791TPSD3+ offers identical core functionality at lower cost. |
| TPS7B8733QDDARQ1 | Single 3.3V output (150mA), no dual output or OUT2; fixed 3.3V only (no adjustable option); no windowed watchdog (standard timeout only). | Suitable for simpler 3.3V-only systems without 5V peripheral rail or advanced watchdog fault discrimination. | Choose TPS7B8733QDDARQ1 only when dual output and windowed watchdog are unnecessary - MAX6791TPSD3+ provides greater integration and fault coverage. |
Compared with MAX6792TPSD3+, the MAX6791TPSD3+ offers identical dual-output regulation, HOLD latching, and reverse-battery protection but with a narrower windowed watchdog ratio range; versus TPS7B8733QDDARQ1, it adds 5V output, adjustable VOUT, and superior fault detection - making it optimal for complex automotive ECUs needing multiple rails and robust supervision.
Availability
MAX6791TPSD3+ is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and electric power steering controllers requiring stable component supply across automotive production lifecycles.
Supply support for MAX6791TPSD3+ 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 high-reliability analog and mixed-signal ICs for automotive, industrial, and communications markets.
The MAX6791–MAX6796 product line delivers high-voltage, micropower linear regulators with integrated supervision - engineered specifically for automotive subsystems demanding wide input range, low IQ, and AEC-Q100-compliant reliability.
FAQ
What output voltages does the MAX6791TPSD3+ provide?
The MAX6791TPSD3+ provides two fixed outputs: OUT1 = 3.3V (±2.5% over −40°C to +125°C) and OUT2 = 5V (±2.5%). Both are factory-trimmed and require no external feedback components. The 3.3V output is selected by the "S" code in the part number, and the reset threshold is set to 87.5% of nominal (2.888V), confirmed in Table 2 of the datasheet.
How is the 50ms reset timeout period implemented in the MAX6791TPSD3+?
The MAX6791TPSD3+ uses the D3 code (indicated by "D3" in the suffix) to configure a fixed 50ms reset timeout period. This is achieved internally - no external capacitor on CSRT is required. The timeout begins when OUT1 rises above its 87.5% reset threshold and holds RESET low for exactly 50ms, ensuring sufficient µP initialization time after brownout recovery.
Does the MAX6791TPSD3+ support reverse-battery protection?
Yes, the MAX6791TPSD3+ integrates reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. When reverse polarity is applied, the internal circuitry disables GATEP output, blocking current flow. This eliminates the need for lossy series diodes and is explicitly supported in the functional diagram and Absolute Maximum Ratings section.
Can the MAX6791TPSD3+ be used in AEC-Q100-compliant designs?
While the MAX6791TPSD3+ itself is not individually AEC-Q100 certified, it belongs to the MAX6791–MAX6796 family, several variants of which (e.g., MAX6795TPLD2/V+) are AEC-Q100 qualified. The MAX6791TPSD3+ shares identical die, package, and process - and is specified for −40°C to +125°C operation with automotive-grade thermal, ESD, and reliability testing per Maxim's internal qualification protocol.
What is the purpose of the HOLD pin on the MAX6791TPSD3+?
The HOLD pin on the MAX6791TPSD3+ enables self-holding behavior: when pulled low after initial power-up, it keeps OUT1 enabled even if ENABLE1 returns low - eliminating the need for external latch circuitry. HOLD is internally pulled up to OUT1 via a 2µA current source, so leaving it unconnected or tying it to OUT1 makes ENABLE1 function as a standard ON/OFF switch.
MAX6791TPSD3+ 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:
- 2.888V, 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)
MAX6791TPSD3+ FAQ
1.How can I place an order for MAX6791TPSD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPSD3+ 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 MAX6791TPSD3+ reliable?
The price and inventory of MAX6791TPSD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPSD3+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPSD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPSD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPSD3+?
MAX6791TPSD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPSD3+ 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 MAX6791TPSD3+?
For technical support, including MAX6791TPSD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPSD3+ requirements.
6.How does Aetrix verify that MAX6791TPSD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPSD3+ 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 MAX6791TPSD3+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPSD3+?
All MAX6791TPSD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPSD3+, 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 MAX6791TPSD3+ part is unused and in its original packaging.
Return procedure for MAX6791TPSD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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