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Analog Devices Inc./Maxim Integrated MAX6791TPMD4+
- Part No.:
- MAX6791TPMD4+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPMD4+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
MAX6791TPMD4+ 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 (OUT1 and OUT2), operates from 5V to 72V input, consumes only 68μA quiescent current, and features a fixed 5V OUT2 and adjustable/fixed OUT1 (e.g., 3.3V). It is used in engine control units (ECUs) to power microcontrollers and sensors under load-dump conditions.
For engineers reviewing the MAX6791TPMD4+ datasheet, MAX6791TPMD4+ pinout, MAX6791TPMD4+ application, or MAX6791TPMD4+ equivalent, key selection considerations include its dual-enable architecture (ENABLE1/ENABLE2), HOLD input for self-holding circuits, windowed watchdog timer (MAX6791-specific), 200ms reset timeout (D4 option), and AEC-Q100-qualified thermal performance in harsh automotive environments.
Technical Context
The MAX6791TPMD4+ implements two independent LDO regulators: OUT1 supports fixed (3.3V, per "T" suffix) or adjustable output (1.8V–11V via SET1), while OUT2 is a dedicated fixed 5V rail. Its RESET output asserts low when OUT1 drops below 87.5% of nominal (per "M" suffix) and remains low for 200ms after recovery (D4), using internal ramping on CSRT.
It integrates a windowed watchdog timer (enabled by WDS0/WDS1 logic) with fast/slow fault detection (tWD1/tWD2), disableable via WD-DIS or WDS pins. The HOLD input latches ON state independently of ENABLE1, enabling ignition-triggered hold-on behavior without external circuitry - critical for automotive wake-up sequencing.
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 ECU modules. |
| Output Current | 150mA per output (OUT1/OUT2) - sufficient for MCU core + peripheral rail in compact ECUs. |
| Reset Threshold | 87.5% of OUT1 nominal (M suffix) - ensures reliable brownout detection at 2.888V for 3.3V OUT1. |
| Reset Timeout | 200ms (D4 suffix) - provides stable reset hold time for slow-starting microcontrollers. |
| Watchdog Type | Windowed (MAX6791-specific) - detects both stuck-high and stuck-low WDI faults, not just timeouts. |
| Operating Temperature | −40°C to +125°C - fully specified for under-hood automotive placement. |
Pinout & Package
MAX6791TPMD4+ is housed in a thermally enhanced 20-pin TQFN-EP package (5mm × 5mm, exposed pad), rated for up to 2.7W continuous dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT1 | Primary regulator output | Fixed 3.3V output (T suffix); requires ≥10μF ceramic capacitor to GND for stability. |
| 3 - SET1 | Feedback reference input | Grounded for preset 3.3V; connected to resistive divider for adjustable output (1.8V–11V). |
| 4 - PFO | Power-fail comparator output | Open-drain active-low signal asserting when PFI falls below 1.231V - used for early battery-low warning. |
| 5 - CSWT | Watchdog timeout adjust | Connected to OUT1 for fixed 280ms timeout; capacitor-to-GND enables adjustable period (e.g., 1500pF → ~236ms). |
| 6 - CSRT | Reset timeout adjust | Connected to OUT1 for fixed 200ms timeout (D4); capacitor-to-GND allows user-defined delay (e.g., 0.1μF → ~140ms). |
| 7 - GND | Power and signal reference | Must be tied to low-impedance PCB ground plane; exposed pad (EP) is electrically GND and thermally critical. |
| 8 - RESET | Supervisory reset output | Active-low push-pull output; asserts during OUT1 undervoltage or watchdog fault, holds for 200ms post-recovery. |
| 11 - WDI | Watchdog input | Edge-sensitive input; toggling required within tWD2 (400ms max) to prevent reset - supports windowed fault detection. |
| 12 - HOLD | Regulator latch control | Active-low; forces OUT1 ON even after ENABLE1 goes low - enables ignition-key-triggered self-hold without external latch. |
| 13, 14 - OUT2 | Secondary regulator output | Fixed 5V output; independent of OUT1; requires ≥10μF ceramic capacitor to GND. |
| 15 - ENABLE2 | OUT2 enable control | Active-high; internally pulled down (0.5μA); controls OUT2 independently of OUT1 and ENABLE1. |
| 16 - PFI | Power-fail comparator input | High-impedance input referenced to 1.231V; used with resistor divider to set custom brownout threshold (e.g., 12V battery monitor). |
| 17, 18 - IN | Main input supply | Accepts 5V–72V; bypassed with 1μF ceramic capacitor to GND near pins for transient immunity. |
| 19 - GATEP | pFET gate driver | Drives external p-channel MOSFET for reverse-battery protection - eliminates series diode voltage drop and heat. |
| 20 - ENABLE1 | OUT1 enable control | Active-high; internally pulled down (0.5μA); primary ON/OFF control for OUT1 before HOLD latching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable inputs | ENABLE1 controls OUT1; ENABLE2 controls OUT2 - enables flexible power sequencing in multi-rail automotive subsystems. |
| HOLD input with self-latching | Enables ignition-triggered ON state retention without external components - reduces BOM count and layout complexity. |
| Windowed watchdog timer | Detects both fast (tWDI < tWD1) and slow (tWDI > tWD2) WDI faults - prevents false resets from noise or clock glitches. |
| Reverse-battery protection drive | GATEP output drives external pFET - achieves <100mV drop vs. >300mV for Schottky diodes, improving efficiency and thermal margin. |
| Adjustable reset & watchdog timing | CSRT and CSWT pins accept capacitors for fine-tuned timeout periods - supports system-specific timing requirements without firmware changes. |
| AEC-Q100 qualified variants | MAX6795TPLD2/V+ and MAX6795TPSD2/V+ are AEC-Q100 Grade-1 qualified - validates reliability for automotive production use. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powers 32-bit MCU core (3.3V) and CAN transceiver (5V) from 12V battery under cold-crank (5.5V) and load-dump (72V) conditions. IC Role / Device Role / Timing Role: Dual-output LDO with independent enable and HOLD latching; RESET asserts during brownout to force MCU safe shutdown. Use Value: 68μA quiescent current extends battery life in sleep mode; 200ms reset hold ensures full MCU reset execution before restart. |
Use Scenario: Supplies door module MCU and LIN transceiver in vehicle interior, requiring robust voltage supervision and fail-safe reset. IC Role / Device Role / Timing Role: Supervisory regulator with PFI-based battery monitoring and windowed watchdog - detects MCU lockup or sensor bus hang. Use Value: PFO provides early warning of battery sag; windowed watchdog distinguishes between valid idle states and true faults. |
| Advanced Driver Assistance System (ADAS) Camera | Infotainment Power Sequencing |
Use Scenario: Powers image sensor (1.8V) and ISP (3.3V) in rear-view camera module mounted near exhaust, subject to high ambient temperature. IC Role / Device Role / Timing Role: High-temp LDO (−40°C to +125°C) with thermal shutdown (165°C) and overvoltage protection (1.1×VOUT). Use Value: 5mm × 5mm TQFN-EP dissipates 2.7W continuously - sustains operation at 105°C ambient with 300mA total load. |
Use Scenario: Sequences power to audio DSP, display controller, and Bluetooth SoC in head unit, requiring controlled startup order and fault isolation. IC Role / Device Role / Timing Role: Dual-rail regulator with independent ENABLE1/ENABLE2 and HOLD - enables staggered turn-on and graceful shutdown on ignition-off. Use Value: HOLD input maintains 3.3V rail during ignition transition; ENABLE2 disables 5V rail first to avoid backfeed into 3.3V domain. |
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 |
|---|---|---|---|
| MAX6792TPMD4+ | Same pinout, identical electrical specs, but includes selectable window ratio (via WDS0/WDS1) and faster minimum watchdog timeout (4.68ms vs. 37.5ms). | Preferred where tighter watchdog window control is needed for real-time safety-critical tasks (e.g., ASIL-B diagnostics). | Select MAX6792TPMD4+ if window ratio configurability or sub-10ms fast-watchdog response is required; otherwise MAX6791TPMD4+ suffices. |
| TLV70733PDQNR | Single-output, 200mA, 2.5V–5.5V input only; no watchdog, RESET, HOLD, or high-voltage capability. | Limited to low-voltage, non-supervisory applications (e.g., post-regulation inside infotainment DC-DC stage). | Only viable as partial functional substitute in non-automotive, low-input-voltage designs lacking supervision - not a drop-in replacement. |
Compared with MAX6792TPMD4+, the MAX6791TPMD4+ offers identical core regulation and supervision but lacks programmable window ratio granularity; compared with TLV70733PDQNR, it delivers full automotive-grade high-voltage operation, dual outputs, and integrated safety features - making it irreplaceable in under-hood ECU designs.
Availability
MAX6791TPMD4+ is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS cameras, and infotainment systems requiring stable component supply across automotive production lifecycles.
Supply support for MAX6791TPMD4+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for demanding industrial and automotive applications.
The MAX6791–MAX6796 product line was designed specifically for automotive power-supply supervision - integrating high-voltage LDOs, precision reset, windowed watchdogs, and reverse-battery protection in a single AEC-Q100-capable package.
FAQ
What output voltage does MAX6791TPMD4+ provide on OUT1 and OUT2?
MAX6791TPMD4+ provides a fixed 3.3V output on OUT1 (indicated by "T" in the part number) and a fixed 5V output on OUT2. The "M" suffix specifies an 87.5% reset threshold relative to OUT1, meaning RESET asserts when OUT1 falls below 2.888V. OUT2 is always 5V and cannot be adjusted.
How is the 200ms reset timeout implemented in MAX6791TPMD4+?
The 200ms reset timeout in MAX6791TPMD4+ is achieved via the D4 suffix configuration: CSRT pin is internally connected to OUT1, selecting the fixed 200ms timeout period. This ensures RESET remains asserted for exactly 200ms after OUT1 recovers above its 87.5% threshold, providing deterministic reset hold time for microcontrollers.
Does MAX6791TPMD4+ support reverse-battery protection, and how is it implemented?
Yes, MAX6791TPMD4+ supports reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. When battery polarity is reversed, the device shuts off the MOSFET, blocking current flow. This replaces lossy series diodes and achieves <100mV forward drop - critical for efficiency in always-on automotive modules.
Can the watchdog timer in MAX6791TPMD4+ be disabled, and how?
Yes, the watchdog timer in MAX6791TPMD4+ can be disabled by driving the WD-DIS pin low, or by setting WDS0 high and WDS1 low (for MAX6791/MAX6792 variants). Disabling preserves system flexibility during development or in applications where software-managed supervision is preferred over hardware watchdog enforcement.
What is the purpose of the HOLD input on MAX6791TPMD4+, and how is it used in automotive systems?
The HOLD input on MAX6791TPMD4+ is an active-low latch that keeps OUT1 enabled even after ENABLE1 is deasserted. In automotive systems, it's commonly tied to ignition-switched voltage: a momentary ENABLE1 pulse turns on the regulator, then HOLD sustains power until ignition-off. This enables self-holding without external latches or microcontroller intervention.
MAX6791TPMD4+ 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:
- 4.375V, 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)
MAX6791TPMD4+ FAQ
1.How can I place an order for MAX6791TPMD4+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPMD4+ 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 MAX6791TPMD4+ reliable?
The price and inventory of MAX6791TPMD4+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPMD4+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPMD4+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPMD4+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPMD4+?
MAX6791TPMD4+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPMD4+ 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 MAX6791TPMD4+?
For technical support, including MAX6791TPMD4+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPMD4+ requirements.
6.How does Aetrix verify that MAX6791TPMD4+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPMD4+ 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 MAX6791TPMD4+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPMD4+?
All MAX6791TPMD4+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPMD4+, 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 MAX6791TPMD4+ part is unused and in its original packaging.
Return procedure for MAX6791TPMD4+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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