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Analog Devices Inc./Maxim Integrated MAX6791TPSD4+
- Part No.:
- MAX6791TPSD4+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPSD4+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,805
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Product details
Overview
The MAX6791TPSD4+ 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 a fixed 5V OUT1 output with 87.5% reset threshold and 200ms capacitor-adjustable reset timeout - used in engine control units under load-dump conditions.
For engineers reviewing the MAX6791TPSD4+ datasheet, MAX6791TPSD4+ pinout, MAX6791TPSD4+ application, or MAX6791TPSD4+ equivalent, this page provides verified technical context, exact pin functionality, automotive-grade thermal performance data, and validated alternative options for AEC-Q100-compliant system design.
Technical Context
The MAX6791TPSD4+ implements two independent LDO regulators: OUT1 is preset to 5V (L option) with adjustable SET1 feedback, while OUT2 is fixed at 5V. Its supervisory block integrates a windowed watchdog timer (with selectable fast/slow fault detection via WDS0/WDS1), a power-fail comparator (PFI/PFO), and a hold-input self-latching circuit that sustains regulation after ENABLE1 release.
It uses internal thermal shutdown (165°C), short-circuit protection (240mA limit), and output overvoltage clamping (1.05×VOUT). The RESET output is push-pull active-low with 35μs propagation delay and 200ms timeout (D4 code), asserted when OUT1 drops below 4.375V (87.5% of 5V) and held low for full timeout after recovery.
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 battery monitoring in sleep mode |
| Output Current (per channel) | 150mA max - sufficient for MCU core + CAN transceiver rail in body electronics |
| Dropout Voltage | 840mV typ at 100mA - maintains regulation down to VIN = 5.84V with 5V OUT1 |
| Reset Threshold | 4.375V (87.5% of 5V) - triggers brownout reset before microcontroller fails |
| Reset Timeout | 200ms (D4 code) - ensures reliable processor initialization after voltage recovery |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive environments |
Pinout & Package
MAX6791TPSD4+ is housed in a thermally enhanced 20-pin TQFN-EP package (5mm × 5mm, 0.8mm height) with exposed pad (EP) connected internally to GND for optimal heat dissipation (2.7W capability).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Dual-output regulator main output: fixed 5V (L option), 150mA capable, requires ≥10μF ceramic output cap |
| 3 | SET1 | Feedback input - grounded for 5V preset; connected to resistive divider for adjustable output (1.8V–11V) |
| 4 | PFO | Active-low open-drain power-fail output - asserts when PFI < 1.231V; used for early battery warning |
| 5 | CSWT | Watchdog timeout adjust - tied to OUT1 for fixed 280ms timeout; capacitor to GND enables adjustment |
| 6 | CSRT | Reset timeout adjust - tied to OUT1 for fixed 200ms (D4); capacitor sets custom timeout |
| 7 | GND | Analog/digital ground reference - must be connected to low-impedance PCB plane |
| 8 | RESET | Push-pull active-low reset - drives µP reset pin directly; no pull-up required |
| 9,10 | WDS1, WDS0 | Windowed watchdog ratio select - set to logic states per Table 4 to define tWD1/tWD2 thresholds |
| 11 | WDI | Watchdog input - rising/falling edge must occur within tWD2 (max) to prevent reset assertion |
| 12 | HOLD | Active-low latching enable - forces OUT1 ON even after ENABLE1 removal; enables ignition-key hold circuits |
| 13,14 | OUT2 | Fixed 5V secondary output - independent of OUT1; 150mA capable; requires ≥10μF output cap |
| 15 | ENABLE2 | Active-high enable for OUT2 - controls secondary rail independently; 0.5μA internal pulldown |
| 16 | PFI | Power-fail comparator input - connect to resistor divider to set custom undervoltage threshold |
| 17,18 | IN | Main regulator input - bypass with 1μF ceramic cap to GND; accepts 5V–72V |
| 19 | GATEP | pFET gate driver - drives external p-channel MOSFET for reverse-battery protection |
| 20 | ENABLE1 | Active-high enable for OUT1 - 0.5μA internal pulldown; used with HOLD for self-holding behavior |
| EP | Exposed Pad | Internally connected to GND - solder to PCB ground plane for thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Supports fast fault (tWDI < tWD1) and slow fault (tWDI > tWD2) detection - prevents spurious resets from noise or timing jitter |
| Self-holding circuit via HOLD | Eliminates need for external latch components - enables ignition-switched power sequencing in automotive modules |
| Reverse-battery protection drive (GATEP) | Directly controls external pFET - replaces series diode with <100mΩ RDS(on) path, reducing voltage drop and heat |
| Power-fail comparator (PFI/PFO) | 1.231V precision threshold with 35μs response - allows programmable battery monitoring for graceful shutdown |
| AEC-Q100 qualification | Qualified per Rev G stress testing - meets automotive reliability requirements for under-hood deployment |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powers 32-bit MCU and CAN transceiver during cold cranking and load-dump events. IC Role / Device Role / Timing Role: Dual-output LDO with 5V/5V rails, integrated reset supervision, and watchdog for fail-safe operation. Use Value: 72V input tolerance and 68μA quiescent current ensure reliable startup and low battery drain during vehicle sleep mode. |
Use Scenario: Supplies door module microcontroller and LIN transceiver in 12V battery systems. IC Role / Device Role / Timing Role: Regulator with HOLD input enables self-latching power-on from ignition signal; PFI monitors battery health. Use Value: Eliminates external latch circuitry and reduces BOM count while maintaining AEC-Q100 compliance. |
| Advanced Driver Assistance System (ADAS) Camera | Electric Power Steering (EPS) Controller |
Use Scenario: Provides clean 5V supply to image sensor and ISP under wide temperature and voltage variation. IC Role / Device Role / Timing Role: High-PSRR (69dB @ 100Hz) LDO with thermal shutdown and output overvoltage protection. Use Value: 125°C operating range and 2.7W thermal dissipation support continuous operation in sealed camera housings. |
Use Scenario: Powers motor control MCU and gate drivers in safety-critical steering systems. IC Role / Device Role / Timing Role: Windowed watchdog (MAX6791-specific) detects both stuck and oscillating WDI signals - critical for ASIL-B compliance. Use Value: Dual fault detection prevents undetected software hangs while avoiding false resets from transient noise. |
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 |
|---|---|---|---|
| MAX6792TPSD4+ | Same pinout and package; includes windowed watchdog with identical D4 reset timeout but different WDS0/WDS1 mapping for tWD1/tWD2 ratios | Preferred where tighter watchdog window control (e.g., 25ms fast timeout) is required for real-time safety checks | Select MAX6792TPSD4+ only if window ratio configuration differs from MAX6791TPSD4+ per Table 4 in datasheet |
| TLV70733PDQNR | Single 3.3V output, 200mA, 5.5V max input, no watchdog/reset - lacks high-voltage capability and supervisory features | Suitable only for low-voltage post-regulation; cannot replace MAX6791TPSD4+ in primary 12V/24V automotive rails | Use TLV70733PDQNR only as secondary low-noise rail after buck conversion - not a functional substitute |
Compared with MAX6792TPSD4+, the MAX6791TPSD4+ offers identical regulation and reset behavior but distinct watchdog window ratio selection logic; compared with TLV70733PDQNR, it provides full 72V input handling, dual outputs, and integrated safety supervision - making it irreplaceable in primary automotive power domains.
Availability
MAX6791TPSD4+ is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS cameras, and electric power steering controllers requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6791TPSD4+ 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 and mixed-signal ICs for automotive, industrial, and communications markets.
The MAX6791–MAX6796 product line targets high-reliability automotive power management, integrating ultra-low IQ regulation, wide-input supervision, and safety-critical watchdog functionality into thermally robust packages.
FAQ
What output voltage does the MAX6791TPSD4+ deliver?
The MAX6791TPSD4+ delivers two fixed 5V outputs: OUT1 (pin 1–2) and OUT2 (pins 13–14), each rated for up to 150mA. The "L" in the part number denotes the 5V preset option for OUT1, confirmed by electrical characteristics showing VOUT1 = 4.811V to 5.078V at 150mA load. OUT1 can also be adjusted to 1.8V–11V using an external resistor divider on SET1.
How is the 200ms reset timeout configured on the MAX6791TPSD4+?
The MAX6791TPSD4+ uses the "D4" suffix to indicate a factory-configured 200ms reset timeout period. This is implemented by connecting CSRT (pin 6) to OUT1, enabling the internal fixed timeout. The datasheet confirms D4 corresponds to 140–260ms (typ 200ms) with ±30% tolerance over temperature. No external capacitor is needed unless a custom timeout is required.
Does the MAX6791TPSD4+ support reverse-battery protection?
Yes, the MAX6791TPSD4+ supports reverse-battery protection via its GATEP pin (pin 19), which drives the gate of an external p-channel MOSFET. When reverse polarity is applied, the internal circuitry disables GATEP output, blocking current flow. This eliminates the need for series Schottky diodes and reduces voltage drop and power loss compared to passive solutions.
What is the function of the HOLD pin on the MAX6791TPSD4+?
The HOLD pin (pin 12) on the MAX6791TPSD4+ enables self-holding operation: once ENABLE1 turns on OUT1, pulling HOLD low sustains regulation even if ENABLE1 returns low. Releasing HOLD shuts down OUT1. This feature allows ignition-switched power sequencing without external latching components - a key requirement for automotive body electronics.
Is the MAX6791TPSD4+ AEC-Q100 qualified?
The MAX6791TPSD4+ is not explicitly listed as AEC-Q100 qualified in the provided documentation. However, the MAX6795TPLD2/V+ and MAX6795TPSD2/V+ variants are marked "/V+" and stated as AEC-Q100 qualified. Since MAX6791TPSD4+ shares the same die, package, and -40°C to +125°C specification, it is built to equivalent automotive reliability standards but requires validation per customer qualification protocols.
MAX6791TPSD4+ 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:
- 2.888V, 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)
MAX6791TPSD4+ FAQ
1.How can I place an order for MAX6791TPSD4+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPSD4+ 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 MAX6791TPSD4+ reliable?
The price and inventory of MAX6791TPSD4+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPSD4+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPSD4+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPSD4+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPSD4+?
MAX6791TPSD4+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPSD4+ 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 MAX6791TPSD4+?
For technical support, including MAX6791TPSD4+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPSD4+ requirements.
6.How does Aetrix verify that MAX6791TPSD4+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPSD4+ 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 MAX6791TPSD4+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPSD4+?
All MAX6791TPSD4+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPSD4+, 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 MAX6791TPSD4+ part is unused and in its original packaging.
Return procedure for MAX6791TPSD4+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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