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Analog Devices Inc./Maxim Integrated MAX6791TPMD3+T
- Part No.:
- MAX6791TPMD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPMD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6791TPMD3+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 (OUT1 and OUT2), operates from 5V to 72V input, consumes only 68μA quiescent current, and features a fixed 5V OUT2 and adjustable/fixed OUT1 (here configured for 3.3V). It is used in engine control units and body electronics where load-dump resilience and low-power wake-up capability are critical.
For engineers reviewing the MAX6791TPMD3+T datasheet, MAX6791TPMD3+T pinout, MAX6791TPMD3+T application, or MAX6791TPMD3+T equivalent, key selection considerations include its 3.3V/5V dual-output configuration, 50ms reset timeout (D3), 87.5% reset threshold (M), windowed watchdog capability, -40°C to +125°C AEC-Q100–compatible operation, and TQFN-20 thermally enhanced package.
Technical Context
The MAX6791TPMD3+T implements two independent LDO regulators: OUT1 is adjustable or preset (here 3.3V, M-threshold), while OUT2 is fixed at 5V. Its supervisory block includes a windowed watchdog timer (with selectable fast/slow fault detection), a capacitor-adjustable reset timeout (50ms), and a power-fail comparator (PFI/PFO) referenced to 1.231V.
It integrates HOLD and dual ENABLE inputs (ENABLE1/ENABLE2) enabling self-holding circuitry without external components, and features reverse-battery protection via GATEP-driven pFET control. Thermal shutdown (+165°C), short-circuit current limiting (~240mA), and output overvoltage protection (105–110% VOUT) are built-in.
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 monitoring in battery-sensitive systems like telematics. |
| Output Configuration | Dual output: OUT1 = 3.3V (M-threshold, 87.5%), OUT2 = fixed 5V - powers MCU core and I/O rails simultaneously. |
| Reset Timeout | 50ms (D3 option) - ensures reliable microprocessor initialization after brownout recovery. |
| Watchdog Type | Windowed (MAX6791-specific) - detects both stuck-high and stuck-low WDI faults, not just timeout. |
| Package | 20-pin TQFN-EP (5mm × 5mm) - supports 2.7W dissipation for continuous operation at +125°C ambient. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments. |
Pinout & Package
MAX6791TPMD3+T is housed in a 20-pin, 5mm × 5mm thermally enhanced TQFN package with exposed pad (EP) connected to GND. The package supports high-power dissipation (2.7W) and meets AEC-Q100 requirements for automotive use.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OUT1 | 3.3V regulated output (M-threshold); requires ≥10μF ceramic capacitor to GND for stability. |
| 3 | SET1 | Feedback node for OUT1; tied to GND for preset 3.3V operation (M option). |
| 4 | PFO | Open-drain power-fail output; asserts low when PFI < 1.231V - signals early battery sag. |
| 5 | CSWT | Watchdog timeout adjust; connected to OUT1 for fixed 280ms timeout (standard for MAX6791). |
| 6 | CSRT | Reset timeout adjust; connected to OUT1 for fixed 50ms timeout (D3 code). |
| 7 | GND | Power and signal reference; EP must be soldered to PCB ground plane for thermal performance. |
| 8 | RESET | Active-low push-pull reset output; asserts when OUT1 drops below 2.888V (87.5% of 3.3V). |
| 9, 10 | WDS1, WDS0 | Watchdog window-ratio select inputs; configure fast/slow fault detection thresholds per Table 4. |
| 11 | WDI | Watchdog input; rising/falling edges must occur within tWD1/tWD2 windows to avoid reset assertion. |
| 12 | HOLD | Active-low hold enable; latches regulator ON after initial ENABLE1 assertion - enables ignition-key hold logic. |
| 13, 14 | OUT2 | Fixed 5V output; supplies peripherals, CAN transceivers, or sensor biasing independently of OUT1. |
| 15 | ENABLE2 | Active-high enable for OUT2; internal 0.5μA pulldown allows direct microcontroller GPIO control. |
| 16 | PFI | Power-fail comparator input; set via resistor divider to trigger PFO at custom battery voltage threshold. |
| 17, 18 | IN | Main input (5–72V); bypassed with 1μF ceramic capacitor to GND near pins for EMI suppression. |
| 19 | GATEP | pFET gate driver; controls 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 |
|---|---|
| Windowed watchdog timer | Enables detection of both frozen (slow) and oscillating (fast) microcontroller faults - improves system safety beyond standard timeout-only supervision. |
| Self-holding circuit support | HOLD input eliminates need for external latch or auxiliary power rail - simplifies ignition-switched power architecture in ECUs. |
| Reverse-battery protection drive (GATEP) | Direct pFET gate control replaces lossy series diodes - reduces voltage drop and heat generation in 12V/24V battery systems. |
| Capacitor-adjustable reset & watchdog timeouts | CSRT/CSWT pins allow field-tuning of timing without firmware change - supports design reuse across vehicle platforms. |
| Integrated power-fail comparator (PFI/PFO) | 1.231V precision reference enables accurate battery voltage monitoring down to ~6V - supports graceful shutdown before deep discharge. |
Applications
| Engine Control Unit (ECU) Power Management | Body Control Module (BCM) Supervision |
|---|---|
|
Use Scenario: Powers 3.3V MCU core and 5V CAN transceiver in diesel ECU exposed to 72V load-dump events. IC Role / Device Role / Timing Role: Dual-output LDO with reset and watchdog provides primary power sequencing, brownout recovery, and fault-safe restart logic. Use Value: 68μA quiescent current extends battery life during key-off; 72V tolerance avoids external TVS; HOLD enables ignition-triggered latching. |
Use Scenario: Supplies infotainment interface logic and monitors 12V battery health in door module with wake-on-LIN capability. IC Role / Device Role / Timing Role: Regulator + PFI/PFO + RESET acts as central power supervisor for low-power sleep/wake transitions. Use Value: Adjustable PFI threshold enables customizable battery low-warning; 50ms reset ensures deterministic MCU boot after voltage recovery. |
| Advanced Driver Assistance Systems (ADAS) Camera ECU | Electric Power Steering (EPS) Sensor Interface |
|
Use Scenario: Powers image signal processor and serializer in rear-view camera exposed to stop-start cycling and cold cranking. IC Role / Device Role / Timing Role: Dual LDO delivers clean 3.3V/5V rails; windowed watchdog validates real-time vision processing integrity. Use Value: -40°C to +125°C operation ensures reliability in sealed camera housing; 150mA per rail supports high-speed SerDes interfaces. |
Use Scenario: Supplies torque sensor ASIC and monitors supply integrity in EPS motor controller during rapid acceleration/deceleration. IC Role / Device Role / Timing Role: Regulator + RESET + thermal protection provides functional safety–aligned power domain supervision per ISO 26262 ASIL-B. Use Value: Built-in thermal shutdown (+165°C) and short-circuit limiting protect against motor stall conditions; GATEP enables reverse-polarity hardening. |
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 |
|---|---|---|---|
| MAX6792TPMD3+T | Same pinout and specs, but includes programmable window ratio (via WDS0/WDS1) - offers finer watchdog fault discrimination than MAX6791. | Preferred where ASIL-B diagnostics require configurable fast/slow fault thresholds (e.g., ADAS domain controllers). | Select MAX6792TPMD3+T if window-ratio flexibility is needed; otherwise MAX6791TPMD3+T is cost-optimized for fixed-ratio use cases. |
| TLV70733PDQNR | Single 3.3V output, 200mA, 5.5V max input, no watchdog/reset - lacks high-voltage capability, supervision, or dual-rail support. | Only suitable for low-voltage, non-automotive applications (e.g., industrial sensors on 3.3V bus) - not a functional replacement. | TLV70733PDQNR cannot replace MAX6791TPMD3+T in automotive 12V/24V systems due to 5.5V VIN limit and missing supervision features. |
Compared with MAX6792TPMD3+T, the MAX6791TPMD3+T offers identical regulation, reset, and thermal performance but fixed window-ratio settings - reducing configuration overhead in cost-sensitive ECUs. Unlike TLV70733PDQNR, it sustains 72V transients and integrates full supervisory functionality required for ISO 16750–compliant automotive designs.
Availability
MAX6791TPMD3+T is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and electric power steering systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6791TPMD3+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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets.
The MAX6791–MAX6796 family targets automotive power management with integrated supervision - delivering high-voltage resilience, ultra-low IQ, and functional safety–ready features in compact packages.
FAQ
What output voltage options does the MAX6791TPMD3+T support?
The MAX6791TPMD3+T is a dual-output regulator: OUT2 is fixed at 5V, while OUT1 is preset to 3.3V (M option) per the "MD3" suffix. The SET1 pin is internally grounded for this configuration. It can also be reconfigured for 1.8V, 2.5V, or adjustable output (1.8V–11V) using an external resistor divider - but the MAX6791TPMD3+T itself ships with 3.3V/5V factory-set outputs.
How is the reset timeout period configured on the MAX6791TPMD3+T?
The MAX6791TPMD3+T uses the "D3" suffix to indicate a 50ms fixed reset timeout period. This is implemented by connecting the CSRT pin to OUT1 (or OUT2), selecting the internal 50ms option. No external capacitor is required - the timing is factory-trimmed and temperature-compensated across -40°C to +125°C.
Does the MAX6791TPMD3+T support reverse-battery protection?
Yes - the MAX6791TPMD3+T includes a dedicated GATEP pin that drives the gate of an external p-channel MOSFET to block reverse current flow. When reverse polarity is applied, the internal circuitry pulls GATEP low, turning off the pFET and preventing damage. No external diodes or controllers are needed.
What is the function of the HOLD pin on the MAX6791TPMD3+T?
The HOLD pin on the MAX6791TPMD3+T enables self-holding behavior: once ENABLE1 is asserted and OUT1 turns on, pulling HOLD low latches the regulator ON even if ENABLE1 later goes low. Releasing HOLD (letting it float or pulling high) shuts down OUT1 - allowing ignition-key–based power sequencing without external latches or power rails.
Is the MAX6791TPMD3+T qualified for automotive use?
Yes - the MAX6791TPMD3+T is specified for -40°C to +125°C operation, packaged in an AEC-Q100–qualified TQFN-20, and includes automotive-grade protections: load-dump survival (72V), thermal shutdown (+165°C), short-circuit current limiting, and output overvoltage protection. It meets ISO 16750-2 electrical stress requirements.
MAX6791TPMD3+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:
- 4.375V, 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)
MAX6791TPMD3+T FAQ
1.How can I place an order for MAX6791TPMD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPMD3+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 MAX6791TPMD3+T reliable?
The price and inventory of MAX6791TPMD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPMD3+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPMD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPMD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPMD3+T?
MAX6791TPMD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPMD3+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 MAX6791TPMD3+T?
For technical support, including MAX6791TPMD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPMD3+T requirements.
6.How does Aetrix verify that MAX6791TPMD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPMD3+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 MAX6791TPMD3+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPMD3+T?
All MAX6791TPMD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPMD3+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 MAX6791TPMD3+T part is unused and in its original packaging.
Return procedure for MAX6791TPMD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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