My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6791TPSD3+T
- Part No.:
- MAX6791TPSD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPSD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,152
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6791TPSD3+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), features a fixed 3.3V OUT1, fixed 5V OUT2, 68μA quiescent current, and operates across 5V–72V input range-enabling robust operation during load-dump transients in 12V/24V vehicle systems.
For engineers reviewing the MAX6791TPSD3+T datasheet, MAX6791TPSD3+T pinout, MAX6791TPSD3+T application, or MAX6791TPSD3+T equivalent, key selection criteria include its dual-rail 3.3V/5V output capability, 50ms capacitor-adjustable reset timeout, windowed watchdog timer (MAX6791-specific), HOLD self-latching control, and AEC-Q100-aligned thermal performance up to +125°C.
Technical Context
The MAX6791TPSD3+T implements two independent LDO regulators: OUT1 is preset to 3.3V (±2.5% over -40°C to +125°C) and adjustable via SET1; OUT2 is fixed at 5V. Its supervisory block includes a push-pull or open-drain RESET output with 87.5% reset threshold (relative to OUT1), 50ms fixed reset timeout (D3 option), and a windowed watchdog with selectable fast/slow fault detection (tWD1/tWD2).
Control logic integrates ENABLE1/ENABLE2 for independent output enable, HOLD for self-holding latching, WD-DIS/WDS0/WDS1 for watchdog configuration, and PFI/PFO for programmable power-fail monitoring. All functions are hardened for automotive ambient conditions, including thermal shutdown at +165°C with 20°C hysteresis and reverse-battery protection via GATEP-driven pFET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump surges without external clamping |
| Quiescent Current | 68μA typical - enables always-on ECU modules with ultra-low standby power |
| Output Current | 150mA per output (OUT1 & OUT2) - supports dual-rail microcontroller + peripheral biasing |
| Output Voltages | OUT1 = 3.3V (preset), OUT2 = 5V (fixed) - matches common MCU I/O and analog subsystem rails |
| Reset Timeout | 50ms (D3 option) - ensures reliable µP initialization after brownout recovery |
| Watchdog Type | Windowed (MAX6791 only) - detects both stuck-high and stuck-low WDI faults |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive environments |
Pinout & Package
MAX6791TPSD3+T is housed in a thermally enhanced 20-pin TQFN-EP (5mm × 5mm, 0.5mm pitch) with exposed pad (EP) connected internally to GND. The package supports up to 2.7W continuous dissipation and enables PCB-level thermal management via EP soldering to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | 3.3V regulated output (preset); requires ≥10μF ceramic capacitor to GND |
| 3 | SET1 | Feedback node for OUT1; grounded for 3.3V preset, resistively divided for adjustable output |
| 4 | PFO | Open-drain power-fail output; asserts low when PFI < 1.231V (configurable threshold) |
| 5 | CSWT | Watchdog timeout adjust; tied to OUT1 for fixed 280ms timeout or capacitor-grounded for adjustment |
| 6 | CSRT | Reset timeout adjust; tied to OUT1 for fixed 50ms (D3) timeout or capacitor-grounded |
| 7 | GND | Power and signal reference; connects to EP for thermal conduction |
| 8 | RESET | Active-low push-pull reset output; asserts when OUT1 drops below 87.5% nominal or watchdog fault occurs |
| 9,10 | WDS1, WDS0 | Watchdog window ratio select inputs; configure fast/slow fault thresholds or disable watchdog |
| 11 | WDI | Watchdog input; rising/falling edge must occur within tWD1–tWD2 window to avoid reset assertion |
| 12 | HOLD | Active-low latching control; forces OUT1/OUT2 ON even after ENABLE1 goes low |
| 13,14 | OUT2 | Fixed 5V output; supplies secondary loads (e.g., CAN transceivers, sensors) |
| 15 | ENABLE2 | Active-high enable for OUT2; internal 0.5μA pulldown allows direct MCU GPIO control |
| 16 | PFI | Power-fail comparator input; set threshold via resistor divider referenced to 1.231V internal reference |
| 17,18 | IN | Main regulator input; bypassed with ≥1μF ceramic capacitor to GND |
| 19 | GATEP | pFET gate driver; controls external p-channel MOSFET for reverse-battery protection |
| 20 | ENABLE1 | Active-high enable for OUT1; internal 0.5μA pulldown enables simple ON/OFF control |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent outputs | 3.3V (OUT1) + 5V (OUT2) rails eliminate need for second regulator in body-control modules |
| Windowed watchdog timer | Detects both slow (tWDI > tWD2) and fast (tWDI < tWD1) WDI faults-critical for safety-critical firmware monitoring |
| HOLD self-latching function | Enables ignition-key-triggered power sequencing without external latch circuitry or MCU intervention |
| Reverse-battery protection drive | GATEP output directly drives pFET gate, removing series diode losses and enabling >95% efficiency at 150mA |
| AEC-Q100 alignment | Qualified per AEC-Q100 Rev H stress testing (HTOL, TC, UHAST) - validated for automotive production use |
Applications
| Body Control Module (BCM) | Advanced Driver Assistance Systems (ADAS) Camera Power |
|---|---|
Use Scenario: Centralized power management for door locks, lighting, and HVAC actuators in 12V/24V commercial vehicles. IC Role / Device Role / Timing Role: Dual-rail regulator supplying 3.3V to MCU core and 5V to LIN/CAN transceivers; RESET ensures deterministic boot after battery reconnect. Use Value: 68μA quiescent current prevents parasitic drain during vehicle sleep mode; HOLD enables ignition-synchronized wake-up without MCU firmware overhead. | Use Scenario: Powering image sensor, ISP, and serializer in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Primary 3.3V rail for CMOS image sensor and 5V rail for serializer IC; windowed watchdog monitors ISP firmware execution integrity. Use Value: 72V input tolerance survives jump-start transients; thermal shutdown at +165°C protects against enclosed housing overheating. |
| Engine Control Unit (ECU) Auxiliary Rail | Automotive Infotainment Head Unit |
Use Scenario: Providing clean, monitored 3.3V/5V bias to knock sensor interface, fuel injector drivers, and diagnostic circuits. IC Role / Device Role / Timing Role: Regulator with PFI input monitors pre-regulated 5V rail; PFO triggers graceful shutdown before main supply collapse. Use Value: Adjustable PFI threshold enables precise brownout detection; 50ms reset timeout meets ISO 16750-2 cold-crank timing requirements. | Use Scenario: Powering touch controller, audio codec, and display interface in head units with always-on voice wake-up capability. IC Role / Device Role / Timing Role: Always-on 3.3V rail with HOLD latching and watchdog supervision; RESET coordinates safe state entry during ignition-off transition. Use Value: Self-holding eliminates need for external power-controller IC; 125°C rating supports operation behind dashboard glass. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPSD3+T | Same pinout and features, but includes dual-mode SET1 threshold (124mV/62mV) for tighter output regulation at light loads | Better suited for low-ILOAD sensor nodes where 1.8V–3.3V accuracy at 1mA matters | Select MAX6792TPSD3+T if output voltage stability below 10mA is critical; otherwise MAX6791TPSD3+T offers identical functionality at lower cost |
| TLV70733PDQNR | Single 3.3V output, 5.5V max input, no watchdog or RESET, SOT-23-5 package | Lacks dual-rail, supervision, high-voltage capability - only suitable for non-automotive, low-input-voltage auxiliary rails | Use TLV70733PDQNR only for cost-sensitive, non-safety, ≤5.5V consumer applications; not a functional substitute for MAX6791TPSD3+T |
Compared with MAX6792TPSD3+T and TLV70733PDQNR, the MAX6791TPSD3+T uniquely combines dual 3.3V/5V outputs, 72V input tolerance, windowed watchdog, and HOLD latching in one AEC-Q100-aligned package-making it irreplaceable for automotive domain controllers requiring supervised dual-rail power.
Availability
MAX6791TPSD3+T is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, engine control units, and infotainment systems requiring stable component supply across extended temperature and high-reliability lifecycles.
Supply support for MAX6791TPSD3+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 demanding industrial, automotive, and communications applications.
The MAX6791–MAX6796 product line targets automotive power-supply supervision, delivering high-voltage LDO regulation with integrated reset, watchdog, power-fail detection, and reverse-battery protection in compact thermally enhanced packages.
FAQ
What output voltages does the MAX6791TPSD3+T provide?
The MAX6791TPSD3+T provides two fixed outputs: OUT1 = 3.3V (±2.5% over -40°C to +125°C) and OUT2 = 5V (±2.5%). The 3.3V output is selected by grounding the SET1 pin; OUT2 is internally fixed and requires no external components. Both outputs support up to 150mA continuous load current.
How is the reset timeout period configured on the MAX6791TPSD3+T?
The MAX6791TPSD3+T uses the D3 suffix to indicate a factory-configured 50ms reset timeout period. This is implemented by connecting the CSRT pin to OUT1 internally. For field-adjustable timeout, connect a capacitor from CSRT to GND-the timeout scales linearly with capacitance (e.g., 15nF ≈ 50ms).
Does the MAX6791TPSD3+T support reverse-battery protection?
Yes, the MAX6791TPSD3+T includes dedicated GATEP output that drives the gate of an external p-channel MOSFET to block reverse current flow. When reverse battery is applied, GATEP pulls low to turn off the pFET, protecting downstream circuitry without diode voltage drop or power loss.
What is the function of the HOLD pin on the MAX6791TPSD3+T?
The HOLD pin on the MAX6791TPSD3+T enables self-holding behavior: when pulled low after initial power-up, it keeps OUT1/OUT2 enabled even if ENABLE1/ENABLE2 returns low. Releasing HOLD (to high or open) shuts down the outputs. This eliminates external latch circuitry in ignition-controlled systems.
Is the MAX6791TPSD3+T qualified for automotive use?
Yes, the MAX6791TPSD3+T is built to automotive-grade reliability standards. It operates across -40°C to +125°C, includes thermal shutdown (+165°C) with 20°C hysteresis, and is manufactured using processes aligned with AEC-Q100 stress testing requirements-making it suitable for under-hood and cabin applications.
MAX6791TPSD3+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:
- 2.888V, 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)
MAX6791TPSD3+T FAQ
1.How can I place an order for MAX6791TPSD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPSD3+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 MAX6791TPSD3+T reliable?
The price and inventory of MAX6791TPSD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPSD3+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPSD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPSD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPSD3+T?
MAX6791TPSD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPSD3+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 MAX6791TPSD3+T?
For technical support, including MAX6791TPSD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPSD3+T requirements.
6.How does Aetrix verify that MAX6791TPSD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPSD3+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 MAX6791TPSD3+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPSD3+T?
All MAX6791TPSD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPSD3+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 MAX6791TPSD3+T part is unused and in its original packaging.
Return procedure for MAX6791TPSD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6791TPSD3+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
