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Analog Devices Inc./Maxim Integrated MAX6791TPTD2+
- Part No.:
- MAX6791TPTD2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPTD2+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,566
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Product details
Overview
MAX6791TPTD2+ from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive systems requiring robust operation under load-dump (up to 72V) and ultra-low quiescent current (68μA). It delivers up to 150mA per output (OUT1/OUT2), features fixed 5V OUT2 and adjustable/fixed OUT1 (e.g., 3.3V), includes push-pull RESET, windowed watchdog timer, and HOLD-enabled self-holding circuitry - deployed in engine control units and ADAS power domains.
For engineers reviewing the MAX6791TPTD2+ datasheet, MAX6791TPTD2+ pinout, MAX6791TPTD2+ application, or MAX6791TPTD2+ equivalent, key selection criteria include its -40°C to +125°C AEC-Q100–capable operation, 5mm × 5mm TQFN-20 EP package with thermal dissipation up to 2.7W, dual enable inputs (ENABLE1/ENABLE2), and reset threshold tied to 87.5% of OUT1 nominal voltage.
Technical Context
The MAX6791TPTD2+ implements two independent LDO regulators: OUT1 supports preset (3.3V) or adjustable (1.8V–11V) output via SET1 feedback, while OUT2 is fixed at 5V. Its supervisory block integrates a windowed watchdog timer (with selectable fast/slow fault detection thresholds), capacitor-adjustable reset timeout (D2 = 12.5ms), and active-low RESET with push-pull drive capability.
It uses internal 1.231V reference for PFI comparator and 124mV/62mV thresholds for Dual-Mode™ SET logic. The HOLD input enables latch-up behavior without external components, and GATEP drives an external pFET for reverse-battery protection - all operating across 5V–72V input with thermal/short-circuit/overvoltage protection.
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 automotive modules. |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU cores, CAN transceivers, and sensor interfaces. |
| Reset Threshold | 87.5% of OUT1 nominal voltage - ensures reliable microcontroller reset during brownout. |
| Reset Timeout | 12.5ms (D2 option) - meets automotive boot-time requirements for deterministic system initialization. |
| Watchdog Type | Windowed (MAX6791/MAX6792 only) - detects both stuck-high and stuck-low WDI faults. |
| Package | 20-pin TQFN-EP (5mm × 5mm) - thermally enhanced for continuous operation at +125°C ambient. |
Pinout & Package
MAX6791TPTD2+ is housed in a 20-pin thermally enhanced TQFN package (5mm × 5mm, exposed pad), rated for 2.7W power dissipation and specified from –40°C to +125°C. The exposed pad (EP) must be soldered to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Main regulator output (3.3V preset per TD2 suffix); requires ≥10μF ceramic output capacitor. |
| 3 | SET1 | Feedback node for OUT1 - grounded for fixed 3.3V, or connected to resistive divider for adjustable output. |
| 4 | PFO | Open-drain power-fail output - asserts low when PFI falls below 1.231V threshold. |
| 5 | CSWT | Watchdog timeout adjust - tied to OUT1 for fixed 280ms timeout (TD2 implies D2 reset, not watchdog). |
| 6 | CSRT | Reset timeout adjust - tied to OUT1 for fixed 12.5ms timeout (D2 code per ordering guide). |
| 7 | GND | Analog/digital ground reference - connects to EP for thermal path and noise control. |
| 8 | RESET | Active-low push-pull reset output - drives µP reset pin directly; no pull-up required. |
| 9,10 | WDS1, WDS0 | Watchdog window ratio select - set to specific logic states (e.g., WDS1=low, WDS0=high) to configure window mode. |
| 11 | WDI | Watchdog input - requires periodic edge transitions; failure triggers RESET assertion. |
| 12 | HOLD | Active-low latch control - forces OUT1 ON even after ENABLE1 goes low, enabling ignition-key hold circuits. |
| 13,14 | OUT2 | Fixed 5V auxiliary output - powers peripherals like LIN transceivers or analog sensors. |
| 15 | ENABLE2 | Active-high enable for OUT2 - independent control allows staged power sequencing. |
| 16 | PFI | Power-fail comparator input - accepts resistor divider to set custom undervoltage warning threshold. |
| 17,18 | IN | Main input supply pins - bypassed with ≥1μF capacitor to GND near device. |
| 19 | GATEP | pFET gate driver - controls external high-side p-channel MOSFET for reverse-battery protection. |
| 20 | ENABLE1 | Active-high enable for OUT1 - internally pulled down; driven high by ignition signal or MCU GPIO. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Enables detection of both slow (excessive period) and fast (insufficient period) WDI faults - critical for safety-critical automotive firmware monitoring. |
| Dual Independent Enables | ENABLE1 and ENABLE2 allow separate sequencing of OUT1 (MCU core rail) and OUT2 (peripheral rail), reducing inrush current and improving system startup reliability. |
| Self-Holding Circuit via HOLD | Eliminates need for external latching hardware - HOLD low after initial ENABLE1 assertion maintains OUT1 ON until explicitly released. |
| Reverse-Battery Protection Driver | GATEP output drives external pFET to block reverse polarity without diode voltage drop or power loss - preserves efficiency in 12V/24V vehicle systems. |
| Thermally Enhanced TQFN | 5mm × 5mm package with exposed pad dissipates up to 2.7W - sustains full 150mA load at +125°C ambient without derating. |
Applications
| Engine Control Unit (ECU) Power Management | Advanced Driver Assistance Systems (ADAS) Camera Module |
|---|---|
Use Scenario: Powers 32-bit automotive MCU (e.g., S32K series) and CAN FD transceiver in under-hood ECU exposed to 72V load-dump events and wide temperature swings. IC Role / Device Role / Timing Role: Dual-output LDO provides isolated 3.3V core rail (OUT1) and 5V I/O rail (OUT2); RESET asserts during cold-crank brownout to force safe MCU reboot. Use Value: 68μA quiescent current prevents battery drain during extended parking; HOLD input enables ignition-key–driven latching without external components. | Use Scenario: Supplies image signal processor (ISP) and high-speed serializer in rear-view camera module mounted in trunk or bumper. IC Role / Device Role / Timing Role: Regulator delivers stable 3.3V to ISP core and 5V to serializer; windowed watchdog monitors ISP firmware execution to prevent frozen video stream. Use Value: 12.5ms reset timeout ensures deterministic recovery within automotive boot timing budgets; GATEP-driven pFET blocks reverse battery connection during service. |
| Body Control Module (BCM) Subsystem | Automotive Infotainment Head Unit |
Use Scenario: Powers microcontroller, LIN transceiver, and EEPROM in door module subjected to repeated hot-swap and vibration. IC Role / Device Role / Timing Role: OUT1 (3.3V) powers MCU; OUT2 (5V) supplies LIN PHY; PFI monitors battery voltage to trigger graceful shutdown before deep discharge. Use Value: Adjustable PFI threshold enables customizable low-battery warning; thermal shutdown (+165°C) protects against enclosure overheating. | Use Scenario: Provides primary 3.3V rail to application processor and secondary 5V rail to audio codec and display interface in head unit with always-on CAN wake-up capability. IC Role / Device Role / Timing Role: Dual enable inputs allow MCU-controlled power sequencing; RESET output synchronizes boot across multiple SoC power domains. Use Value: 5V–72V input range eliminates need for pre-regulator in 24V commercial vehicle variants; AEC-Q100 qualification ensures long-term reliability. |
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 |
|---|---|---|---|
| MAX6792TPTD2+ | Identical pinout, package, and electrical specs; differs only in watchdog window ratio configuration (WDS0/WDS1 logic mapping). | No functional difference in reset, enable, or regulation behavior; compatible in same PCB layout. | Select MAX6792TPTD2+ only if specific watchdog window ratio (e.g., 16:1) is required per firmware timing constraints. |
| TPS7B8733QDDARQ1 | Single-output (3.3V), 300mA, 3V–40V input, 35μA IQ; lacks dual output, watchdog, HOLD, and PFI functions. | Suitable for simpler 3.3V-only loads but cannot replace dual-rail or supervisory functionality of MAX6791TPTD2+. | Choose only for cost-sensitive, non-safety-critical 3.3V point-of-load where supervisory features are omitted. |
Compared with MAX6792TPTD2+, the MAX6791TPTD2+ offers identical regulation and supervision but with distinct watchdog window logic mapping; versus TPS7B8733QDDARQ1, it provides dual outputs, integrated watchdog, and HOLD latching - making it uniquely suited for complex automotive subsystems requiring coordinated power and safety monitoring.
Availability
MAX6791TPTD2+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, body control modules, and infotainment head units requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6791TPTD2+ 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 automotive, industrial, and communications markets.
The MAX6791–MAX6796 product line targets high-reliability automotive power systems, delivering micropower dual/single LDOs with integrated reset, watchdog, power-fail detection, and reverse-battery protection - specifically engineered for AEC-Q100 compliance and under-hood deployment.
FAQ
What output voltage does MAX6791TPTD2+ deliver on OUT1?
The MAX6791TPTD2+ delivers a fixed 3.3V output on OUT1, as indicated by the "T" in the TD2 suffix (T = 3.3V per Maxim's ordering guide). OUT2 is fixed at 5V. SET1 is grounded internally for this variant, disabling adjustable-mode operation.
Does MAX6791TPTD2+ support capacitor-adjustable reset timeout?
Yes, MAX6791TPTD2+ supports capacitor-adjustable reset timeout via the CSRT pin. However, the "D2" suffix indicates factory-configured 12.5ms fixed timeout (CSRT tied to OUT1). To use adjustable timeout, leave CSRT unconnected from OUT1 and add external capacitor to GND per datasheet Figure 11.
How is the reset threshold determined for MAX6791TPTD2+?
The reset threshold for MAX6791TPTD2+ is 87.5% of the OUT1 nominal voltage, per the "D" in TD2 (D = 87.5% threshold). With OUT1 = 3.3V, the reset asserts when VOUT1 drops below ~2.888V. This threshold is internally trimmed and stable over temperature (±0.5% typical).
Can MAX6791TPTD2+ drive a p-channel MOSFET for reverse-battery protection?
Yes, MAX6791TPTD2+ includes a dedicated GATEP output that drives the gate of an external p-channel MOSFET. When IN is reversed, GATEP pulls low to turn off the MOSFET, blocking reverse current - eliminating the need for lossy series diodes in 12V/24V automotive systems.
Is MAX6791TPTD2+ qualified for automotive use?
Yes, MAX6791TPTD2+ is AEC-Q100 qualified (Grade 0: –40°C to +125°C), with built-in thermal shutdown (+165°C), short-circuit protection, and output overvoltage protection (105–110% of VOUT). Its 5V–72V input range and 68μA quiescent current meet stringent automotive electrical requirements.
MAX6791TPTD2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.053V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 8.75ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPTD2+ FAQ
1.How can I place an order for MAX6791TPTD2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPTD2+ 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 MAX6791TPTD2+ reliable?
The price and inventory of MAX6791TPTD2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPTD2+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPTD2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPTD2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPTD2+?
MAX6791TPTD2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPTD2+ 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 MAX6791TPTD2+?
For technical support, including MAX6791TPTD2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPTD2+ requirements.
6.How does Aetrix verify that MAX6791TPTD2+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPTD2+ 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 MAX6791TPTD2+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPTD2+?
All MAX6791TPTD2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPTD2+, 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 MAX6791TPTD2+ part is unused and in its original packaging.
Return procedure for MAX6791TPTD2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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