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Analog Devices Inc./Maxim Integrated MAX6791TPVD4+
- Part No.:
- MAX6791TPVD4+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPVD4+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,308
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Product details
Overview
MAX6791TPVD4+ from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive systems requiring robust operation across 5V–72V input and -40°C to +125°C ambient. It delivers up to 150mA per output (OUT1/OUT2), features a fixed 5V OUT2 and adjustable/fixed OUT1 (e.g., 5V, 3.3V, 2.5V, or 1.8V), and includes active-low RESET with 200ms timeout (D4 code), windowed watchdog timer, and HOLD-enabled self-holding circuitry - used in engine control units and ADAS power management.
For engineers reviewing the MAX6791TPVD4+ datasheet, MAX6791TPVD4+ pinout, MAX6791TPVD4+ application, or MAX6791TPVD4+ equivalent, this page provides verified technical context, exact pin roles, automotive-grade thermal and protection specs, reset/watchdog timing validation, and direct alternative part comparisons for AEC-Q100-compliant system design.
Technical Context
The MAX6791TPVD4+ implements two independent LDO regulators: OUT1 supports fixed or adjustable output (1.8V–11V) via SET1 feedback, while OUT2 is a dedicated 5V fixed output. Its supervisory block integrates a windowed watchdog timer (with selectable fast/slow fault detection), capacitor-adjustable 200ms reset timeout (CSRT = D4), and power-fail comparator (PFI/PFO) referenced to 1.231V.
It uses ENABLE1/ENABLE2 for independent output control and HOLD to latch ON-state without external components. Protection includes thermal shutdown (+165°C), short-circuit current limiting (~240mA), and output overvoltage clamping at 1.05×VOUT - all specified across full automotive temperature range and qualified per AEC-Q100.
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 like telematics. |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU cores, CAN transceivers, and sensor interfaces. |
| Reset Timeout (D4) | 140ms / 200ms / 260ms (min/typ/max) - ensures reliable microprocessor initialization after brownout recovery. |
| Dropout Voltage | 840mV typ at 100mA (dual mode) - maintains regulation during cold-crank conditions down to 6V input. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments. |
| Watchdog Type | Windowed (MAX6791-specific) - detects both stuck-high and stuck-low WDI faults, preventing silent failures. |
Pinout & Package
MAX6791TPVD4+ is housed in a thermally enhanced 20-pin TQFN-EP package (5mm × 5mm, exposed pad), rated for 2.7W continuous dissipation and optimized for high-ambient automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Main regulated output (5V preset or adjustable 1.8V–11V); requires ≥10μF ceramic capacitor to GND. |
| 3 | SET1 | Feedback node for OUT1 voltage setting; grounded for fixed output, connected to resistive divider for adjustable mode. |
| 4 | PFO | Open-drain power-fail output; asserts low when PFI falls below 1.231V - used for early battery-low warning. |
| 5 | CSWT | Watchdog timeout adjustment; tied to OUT1 for fixed 280ms timeout or capacitor-grounded for adjustable period. |
| 6 | CSRT | Reset timeout adjustment; tied to OUT1 for fixed D4 (200ms typ) timeout or capacitor-grounded for custom delay. |
| 7 | GND | Analog/digital ground reference; must be connected to low-impedance PCB plane. |
| 8 | RESET | Active-low reset output (push-pull or open-drain); asserts when OUT1 drops below threshold or watchdog expires. |
| 9,10 | WDS1, WDS0 | Window ratio select inputs; configure fast/slow watchdog thresholds (e.g., 8×, 16×, 64× base period) or disable timer. |
| 11 | WDI | Watchdog input; requires edge transition within tWD window to prevent reset assertion - critical for MCU health monitoring. |
| 12 | HOLD | Active-low latching enable; forces OUT1 ON even after ENABLE1 goes low - enables ignition-key self-hold circuits. |
| 13,14 | OUT2 | Dedicated fixed 5V output; independent of OUT1, supports separate subsystems (e.g., display backlight, I/O). |
| 15 | ENABLE2 | Active-high enable for OUT2; internal 0.5μA pulldown allows direct microcontroller GPIO control. |
| 16 | PFI | Power-fail comparator input; set threshold via resistor divider to monitor battery or pre-regulated rail voltage. |
| 17,18 | IN | Main input supply (5V–72V); bypassed with ≥1μF ceramic capacitor to GND for stability. |
| 19 | GATEP | pFET gate driver; controls external PMOS for reverse-battery protection - eliminates series diode losses. |
| 20 | ENABLE1 | Active-high enable for OUT1; internal 0.5μA pulldown enables simple ON/OFF control from MCU or switch. |
| EP | Exposed Pad | Internally connected to GND; must be soldered to PCB thermal pad for optimal heat dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed Watchdog Timer | Prevents undetected MCU lockup by detecting both too-fast (tWDI < tWD1) and too-slow (tWDI > tWD2) WDI transitions - unique to MAX6791/MAX6792. |
| Self-Holding Circuit (HOLD) | Eliminates need for external latch or microcontroller firmware intervention to maintain regulator ON-state after ignition key release. |
| Reverse-Battery Protection Driver (GATEP) | Directly drives p-channel MOSFET gate to block reverse polarity - replaces lossy series diodes and improves efficiency. |
| Capacitor-Adjustable Reset Timeout | CSRT pin supports precise reset hold time tuning (e.g., 200ms typ for D4) to match specific µP reset requirements. |
| AEC-Q100 Qualified | Qualified per AEC-Q100 Rev H Grade 0 (−40°C to +125°C) - validated for safety-critical automotive ECUs and ADAS modules. |
Applications
| Engine Control Unit (ECU) Power Management | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Stable dual-rail power for 32-bit MCU core (3.3V) and CAN FD transceiver (5V) in harsh under-hood environment with wide battery swing and load-dump events. IC Role / Device Role / Timing Role: Dual-output LDO with independent EN/OUT control, HOLD-latched startup, and 200ms reset timeout ensures deterministic boot sequence after cranking. Use Value: Eliminates need for discrete reset IC and external hold circuit, reducing BOM count and PCB area while meeting ISO 16750-2 pulse test requirements. |
Use Scenario: Powering vision processor, radar SoC, and camera interface in forward collision warning system where functional safety demands fail-safe supervision. IC Role / Device Role / Timing Role: Windowed watchdog monitors processor heartbeat; RESET asserts on missed or stuck WDI edges, triggering safe state entry within 200ms. Use Value: Meets ASIL-B diagnostic coverage requirements by detecting both software hang and hardware signal failure - no additional safety monitor needed. |
| Telematics Control Unit (TCU) | Body Control Module (BCM) |
|
Use Scenario: Always-on 5V rail for GNSS receiver and cellular modem during vehicle sleep mode, with ultra-low 68μA quiescent current to avoid battery drain. IC Role / Device Role / Timing Role: Low-IQ dual regulator supplies modem (5V) and secure element (3.3V); HOLD sustains power during ignition-off transitions. Use Value: Enables <100μA system sleep current - compliant with UNECE R100 battery discharge limits for parked vehicles. |
Use Scenario: Centralized power for door module, lighting drivers, and LIN transceivers across multiple vehicle domains with shared 5V/3.3V rails. IC Role / Device Role / Timing Role: Dual outputs decouple noise-sensitive analog sensors (3.3V) from high-current LED drivers (5V); PFI monitors main battery for low-voltage shutdown. Use Value: Single-chip solution reduces inter-rail coupling, simplifies layout, and provides coordinated brownout response across subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive LDO with supervisory functions applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPVD4+ | Identical pinout, package, and electrical specs; differs only in watchdog window ratio configuration (WDS0/WDS1 logic levels). | Same use cases; selected when alternate window ratios (e.g., 16× vs 8×) better match MCU watchdog timing margins. | Drop-in replacement if window ratio matches design requirement; verify WDS0/WDS1 strap logic per datasheet Table 4. |
| TLV70733PDQNR | Single-output, 3.3V fixed, 200mA, 5V–6.5V input only; no watchdog, RESET, HOLD, or PFI - lacks supervisory integration. | Suitable only for non-safety, low-voltage auxiliary rails (e.g., infotainment USB port) without system-level monitoring needs. | Not a functional substitute; use only where supervisory features are omitted and input voltage stays within narrow range. |
Compared with MAX6792TPVD4+, the MAX6791TPVD4+ offers identical regulation and timing but targets distinct watchdog window configurations; versus TLV70733PDQNR, it provides full automotive-grade supervision, high-voltage tolerance, and dual-rail capability - making it irreplaceable in AEC-Q100-compliant ECU designs.
Availability
MAX6791TPVD4+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, telematics systems, and body electronics requiring stable component supply under AEC-Q100 qualification and extended temperature operation.
Supply support for MAX6791TPVD4+ 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 MAX6791TPVD4+ belongs to the MAX6791–MAX6796 family of high-voltage micropower regulators with integrated supervision - engineered specifically for automotive power domains needing load-dump resilience, ultra-low IQ, and functional safety-ready monitoring.
FAQ
What output voltage options does the MAX6791TPVD4+ support?
The MAX6791TPVD4+ supports dual outputs: OUT2 is fixed at 5V, while OUT1 is configurable as 5V, 3.3V, 2.5V, or 1.8V (preset) or adjustable from 1.8V to 11V using an external resistor divider on SET1. The "V" in TPVD4+ denotes a 3.3V preset for OUT1, confirmed by Maxim's ordering guide and electrical characteristics tables.
How is the 200ms reset timeout implemented in the MAX6791TPVD4+?
The MAX6791TPVD4+ achieves its 200ms typical reset timeout (D4 code) by connecting CSRT to OUT1, selecting the internal fixed timing option. Per Electrical Characteristics table, D4 yields 140ms (min), 200ms (typ), and 260ms (max) - guaranteed over -40°C to +125°C and validated in typical operating curves (MAX6791toc10).
Does the MAX6791TPVD4+ include reverse-battery protection?
Yes, the MAX6791TPVD4+ integrates reverse-battery protection via the GATEP pin, which drives the gate of an external p-channel MOSFET to block reverse current flow. This eliminates the need for lossy series diodes and is explicitly documented in the Reverse-Battery Protection Circuitry section and functional diagrams.
What is the function of the HOLD pin on the MAX6791TPVD4+?
The HOLD pin on the MAX6791TPVD4+ is an active-low input that latches the regulator ON-state: once enabled, pulling HOLD low maintains OUT1/OUT2 operation even if ENABLE1/ENABLE2 is subsequently deasserted. Releasing HOLD shuts down the outputs - enabling ignition-key self-hold circuits without external components.
Is the MAX6791TPVD4+ AEC-Q100 qualified?
Yes, the MAX6791TPVD4+ is AEC-Q100 qualified (Grade 0, −40°C to +125°C), as stated in the Benefits and Features section and confirmed in the Ordering Information table for automotive-grade variants denoted by "/V+". This qualification covers stress testing, reliability, and parametric validation for automotive use.
MAX6791TPVD4+ 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:
- 1.575V, 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)
MAX6791TPVD4+ FAQ
1.How can I place an order for MAX6791TPVD4+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPVD4+ 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 MAX6791TPVD4+ reliable?
The price and inventory of MAX6791TPVD4+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPVD4+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPVD4+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPVD4+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPVD4+?
MAX6791TPVD4+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPVD4+ 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 MAX6791TPVD4+?
For technical support, including MAX6791TPVD4+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPVD4+ requirements.
6.How does Aetrix verify that MAX6791TPVD4+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPVD4+ 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 MAX6791TPVD4+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPVD4+?
All MAX6791TPVD4+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPVD4+, 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 MAX6791TPVD4+ part is unused and in its original packaging.
Return procedure for MAX6791TPVD4+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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