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Analog Devices Inc./Maxim Integrated MAX6791TPMD2+T
- Part No.:
- MAX6791TPMD2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPMD2+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,947
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Product details
Overview
The MAX6791TPMD2+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), supports 5V to 72V input range, features 68μA quiescent current, and includes push-pull RESET, windowed watchdog timer, and HOLD-enabled self-holding circuitry - used in engine control units (ECUs) and ADAS domain controllers requiring robust brownout recovery.
For engineers reviewing the MAX6791TPMD2+T datasheet, MAX6791TPMD2+T pinout, MAX6791TPMD2+T application, or MAX6791TPMD2+T equivalent, key selection criteria include its dual 5V/5V fixed output configuration, 12.5ms reset timeout (D2), -40°C to +125°C AEC-Q100–compatible operation, and TQFN-20EP thermal package enabling continuous duty under high ambient temperature and load-dump conditions.
Technical Context
The MAX6791TPMD2+T implements two independent LDO regulators: OUT1 is adjustable or preset (here configured as 5V), while OUT2 is fixed at 5V. Its supervisory block integrates a windowed watchdog timer (tWD1 = 12.5ms / tWD2 = 280ms min) with WDS0/WDS1 programmable ratio, and a RESET output with fixed 92.5% threshold relative to OUT1 and capacitor-adjustable or internally set 12.5ms timeout (CSRT = D2).
It uses internal SET1 feedback with GND reference for OUT1 voltage selection, ENABLE1/ENABLE2 for independent channel control, HOLD for latch-on behavior, and GATEP to drive an external pFET for reverse-battery protection - all operating within ±0.3V absolute max ratings on logic pins referenced to OUT1/OUT2.
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 ECU subsystems with minimal battery drain. |
| Output Current | 150mA per output (OUT1/OUT2) - sufficient for microcontroller cores, CAN transceivers, and sensor interfaces. |
| Reset Threshold | 92.5% of OUT1 nominal - ensures reliable brownout detection before MCU functional failure. |
| Reset Timeout | 12.5ms (D2 code) - meets ISO 16750-2 cold-cranking timing requirements for system reset hold. |
| Watchdog Type | Windowed (tWD1/tWD2) - detects both stuck-high and stuck-low WDI faults in safety-critical firmware. |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive environments per AEC-Q100 stress testing. |
Pinout & Package
Package: 20-pin TQFN-EP (5mm × 5mm, exposed pad), thermally enhanced for 2.7W dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | OUT1 | Dual-output regulator Channel 1 - fixed 5V output (per MD2 suffix), requires ≥10μF ceramic output capacitor. |
| 3 | SET1 | Feedback node for OUT1 - tied to GND for preset 5V mode; open for adjustable configuration. |
| 4 | PFO | Open-drain power-fail output - asserts low when PFI < 1.231V, used for early battery-low warning. |
| 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 12.5ms timeout (D2 code per ordering guide). |
| 7 | GND | Power and signal reference - must be low-impedance connection to PCB ground plane. |
| 8 | RESET | Active-low push-pull reset - drives MCU reset pin directly; no pull-up required. |
| 9, 10 | WDS1, WDS0 | Watchdog window ratio select - MD2 implies 12.5ms/280ms window (ratio = 16 per Table 4). |
| 11 | WDI | Watchdog input - rising/falling edge must occur within tWD2 window to prevent reset assertion. |
| 12 | HOLD | Active-low latch enable - forces OUT1 ON even after ENABLE1 goes low; critical for ignition-key hold circuits. |
| 13, 14 | OUT2 | Dual-output regulator Channel 2 - fixed 5V output, independent of OUT1 regulation. |
| 15 | ENABLE2 | Active-high enable for OUT2 - internal 0.5μA pulldown allows direct MCU GPIO control. |
| 16 | PFI | Power-fail comparator input - sets battery-low threshold via external resistor divider referenced to 1.231V. |
| 17, 18 | IN | Main regulator input - bypassed with 1μF ceramic capacitor to GND for stability. |
| 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 external resistor. |
| EP | Exposed Pad | Thermal & electrical GND - must be soldered to PCB ground plane for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 5V outputs (OUT1/OUT2) | Independent 150mA LDOs eliminate need for secondary regulators in multi-rail ECUs. |
| Windowed watchdog timer | Detects both firmware hang (no WDI toggle) and spurious noise (excessive WDI frequency) - essential for ASIL-B compliance. |
| HOLD-enabled self-holding | Enables ignition-switched power sequencing without external latching components or software intervention. |
| Reverse-battery protection drive (GATEP) | Directly controls pFET to replace lossy series diodes - improves efficiency and reduces thermal footprint. |
| 12.5ms fixed reset timeout (D2) | Guarantees MCU reset pulse width exceeds minimum requirement for ARM Cortex-M boot ROM initialization. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powers MCU, CAN transceiver, and analog sensor front-end in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Dual 5V LDO with synchronized RESET and windowed watchdog provides deterministic power-up sequencing and fault containment. Use Value: 68μA quiescent current extends battery life during vehicle sleep mode; 72V input tolerance survives alternator load-dump events. | Use Scenario: Supplies vision processor, radar SoC, and camera interface in forward collision warning and lane departure systems. IC Role / Device Role / Timing Role: Regulator + supervisor combo ensures clean power delivery and safe firmware restart upon voltage sag or software lockup. Use Value: HOLD function maintains power during ignition cycling; PFI/PFO enables predictive battery health monitoring before system shutdown. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Manages power to door module MCUs, LIN transceivers, and LED drivers in centralized body electronics. IC Role / Device Role / Timing Role: Dual-output architecture powers separate logic and I/O rails; RESET output coordinates multi-chip initialization. Use Value: 12.5ms reset timeout satisfies SAE J1939-13 cold-cranking timing; TQFN-20EP package fits space-constrained BCM layouts. | Use Scenario: Provides stable 5V supply to torque-sensing ASICs, motor gate drivers, and safety-monitoring MCUs in steer-by-wire systems. IC Role / Device Role / Timing Role: Windowed watchdog validates real-time control loop execution; GATEP-driven pFET prevents reverse-current damage during battery jump-start. Use Value: AEC-Q100 qualification ensures reliability under EPS vibration and thermal cycling; thermal protection prevents latch-up during sustained motor stall. |
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 |
|---|---|---|---|
| MAX6792TPMD2+T | Same pinout and features, but includes dual-mode SET1 threshold (124mV/62mV) for tighter output voltage tolerance at light loads. | Preferred for precision analog subsystems where 5V rail accuracy < ±1% is required across temperature. | Select MAX6792TPMD2+T when tighter initial output tolerance (±1.5% vs. ±2.5%) and improved line/load regulation are needed. |
| TLV70733PDQNR | Single 3.3V output, 200mA, 5.5V max input, no watchdog or RESET - lacks supervisory functions and automotive temp range. | Suitable only for non-automotive, low-voltage, single-rail applications with no safety monitoring requirements. | Not a functional replacement; use only in cost-sensitive consumer designs without reset/watchdog needs. |
Compared with MAX6792TPMD2+T, the MAX6791TPMD2+T offers identical dual 5V regulation and windowed watchdog but with slightly relaxed output accuracy - making it optimal for general-purpose ECU power where cost and proven field reliability outweigh marginal tolerance gains. TLV70733PDQNR cannot substitute due to missing high-voltage capability, dual outputs, and safety features.
Availability
The MAX6791TPMD2+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, and body control modules requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for MAX6791TPMD2+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 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, integrating ultra-low-quiescent LDOs with AEC-Q100–qualified supervision to simplify ECU design and reduce bill-of-materials count.
FAQ
What output voltage configuration does the MAX6791TPMD2+T provide?
The MAX6791TPMD2+T is a dual-output regulator with fixed 5V on both OUT1 and OUT2. The "MD2" suffix indicates OUT1 is preset to 5V (M = 5V), OUT2 is fixed 5V, and the reset timeout is 12.5ms (D2). SET1 is internally connected to GND for this configuration - no external resistors required.
Does the MAX6791TPMD2+T support reverse-battery protection?
Yes, the MAX6791TPMD2+T includes GATEP output that drives the gate of an external p-channel MOSFET to block reverse current flow. This eliminates the need for series Schottky diodes, reducing voltage drop and power loss - a critical feature for 12V automotive systems subject to jump-start polarity reversal.
How is the watchdog timeout configured on the MAX6791TPMD2+T?
The MAX6791TPMD2+T uses WDS0 and WDS1 pins to select windowed watchdog ratios. For MD2, WDS1 = high and WDS0 = low (per Table 4), setting tWD1 = 12.5ms and tWD2 = 280ms min. CSWT is tied to OUT1 for fixed timeout; no external capacitor is needed unless adjustable timing is required.
What is the purpose of the HOLD pin on the MAX6791TPMD2+T?
The HOLD pin on the MAX6791TPMD2+T enables self-holding behavior: once ENABLE1 turns ON OUT1, pulling HOLD low keeps OUT1 active even if ENABLE1 later goes low - simulating a mechanical ignition switch latch. Releasing HOLD shuts down OUT1. This eliminates external latch circuitry in automotive power sequencing.
Is the MAX6791TPMD2+T qualified for automotive use?
Yes, the MAX6791TPMD2+T is specified for -40°C to +125°C operation and built on Maxim's automotive-grade process. While not individually listed as AEC-Q100 certified in the datasheet, it belongs to the MAX6791–MAX6796 family used in AEC-Q100–qualified designs (e.g., MAX6795TPLD2/V+), and shares identical construction, testing, and thermal design - making it suitable for under-hood automotive applications.
MAX6791TPMD2+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:
- 8.75ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPMD2+T FAQ
1.How can I place an order for MAX6791TPMD2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPMD2+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 MAX6791TPMD2+T reliable?
The price and inventory of MAX6791TPMD2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPMD2+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPMD2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPMD2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPMD2+T?
MAX6791TPMD2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPMD2+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 MAX6791TPMD2+T?
For technical support, including MAX6791TPMD2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPMD2+T requirements.
6.How does Aetrix verify that MAX6791TPMD2+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPMD2+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 MAX6791TPMD2+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPMD2+T?
All MAX6791TPMD2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPMD2+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 MAX6791TPMD2+T part is unused and in its original packaging.
Return procedure for MAX6791TPMD2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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