My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6791TPWD3+
- Part No.:
- MAX6791TPWD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPWD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,066
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6791TPWD3+ from Maxim Integrated is a dual-output, ultra-low-quiescent-current linear regulator with integrated supervisory functions, designed for automotive power management. It operates from 5V to 72V input, delivers up to 150mA per output (OUT1/OUT2), features fixed 5V + adjustable OUT1 (1.8V–11V), and includes push-pull RESET, windowed watchdog timer, and HOLD self-hold functionality - deployed in engine control units and ADAS domain controllers.
For engineers reviewing the MAX6791TPWD3+ datasheet, MAX6791TPWD3+ pinout, MAX6791TPWD3+ application, or MAX6791TPWD3+ equivalent, key selection criteria include its 68μA quiescent current, -40°C to +125°C AEC-Q100–compatible operation, dual enable inputs (ENABLE1/ENABLE2), and capacitor-adjustable 50ms reset timeout (D3 code), critical for reliable cold-cranking and load-dump resilience.
Technical Context
The MAX6791TPWD3+ implements two independent LDO regulators: OUT1 supports preset (5V/3.3V/2.5V/1.8V) or adjustable output via SET1 feedback, while OUT2 is fixed at 5V. Its windowed watchdog (tWD1/tWD2) detects both fast and slow WDI pulse faults, with selectable ratios via WDS0/WDS1 pins - distinct from standard timeout-only watchdogs in MAX6793–MAX6796.
Supervision logic integrates a precision 1.231V PFI comparator, open-drain PFO, and RESET output with 92.5% (OUT1) reset threshold. The HOLD input enables self-holding behavior without external latching circuitry, and GATEP drives an external pFET for reverse-battery protection - all within a single 20-pin TQFN package rated for continuous 2.7W dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without shutdown or damage. |
| Quiescent Current | 68μA typical - enables always-on functionality in battery-sensitive systems (e.g., telematics sleep mode). |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient to power microcontrollers, CAN transceivers, and sensors simultaneously. |
| Reset Timeout | 50ms (D3 code) - ensures stable µP initialization after brownout recovery before firmware execution resumes. |
| Watchdog Type | Windowed (MIN/MAX) - detects both stuck-high and stuck-low WDI faults, preventing false resets during ECU idle states. |
| Operating Temperature | -40°C to +125°C - fully specified across automotive under-hood ambient conditions. |
| Dropout Voltage | 840mV typ @100mA (dual) - maintains regulation during cranking when battery dips to 6V while powering 5V loads. |
Pinout & Package
Package: 20-pin thermally enhanced TQFN-EP (5mm × 5mm, exposed pad), rated for 2.7W continuous power dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Dual-output regulator main output (5V preset or adjustable 1.8V–11V); requires ≥10µF ceramic bypass to GND. |
| 3 | SET1 | Feedback node for OUT1 voltage setting; grounded for preset outputs, connected to resistive divider for adjustable mode. |
| 4 | PFO | Active-low open-drain power-fail output - asserts when PFI falls below 1.231V, used for early battery-low warning. |
| 5 | CSWT | Watchdog timeout adjust input; tied to OUT1 for fixed 280ms timeout or capacitor-grounded for adjustable period. |
| 6 | CSRT | Reset timeout adjust input; tied to OUT1 for fixed 50ms (D3) timeout or capacitor-grounded for user-defined delay. |
| 7 | GND | Analog/digital ground reference; must be low-impedance connection to PCB ground plane. |
| 8 | RESET | Active-low push-pull reset output - drives µP reset pin directly; asserts when OUT1 drops below 92.5% nominal. |
| 9,10 | WDS1, WDS0 | Watchdog window ratio select inputs; configure MIN/MAX timing windows (e.g., 8×, 16×, 64×) for MAX6791/MAX6792 only. |
| 11 | WDI | Watchdog input - requires valid edge transition within tWD1/tWD2 window; failure triggers RESET assertion. |
| 12 | HOLD | Active-low hold input - forces OUT1 ON even after ENABLE1 goes low, enabling ignition-key–triggered self-hold circuits. |
| 13,14 | OUT2 | Fixed 5V secondary output - powers auxiliary loads (e.g., LIN transceivers, sensors); requires ≥10µF bypass. |
| 15 | ENABLE2 | Active-high enable for OUT2 - independent control allows selective powering of secondary rail. |
| 16 | PFI | Power-fail comparator input - connected to resistor divider to set custom undervoltage detection threshold. |
| 17,18 | IN | Main regulator input - accepts 5V–72V; bypassed with 1µF ceramic capacitor to GND for stability. |
| 19 | GATEP | pFET gate drive output - controls external high-side p-channel MOSFET for reverse-battery protection. |
| 20 | ENABLE1 | Active-high enable for OUT1 - internal 0.5µA pulldown enables default OFF state until asserted by host controller. |
| EP | Exposed Pad | Internally connected to GND - must be soldered to PCB thermal pad for optimal junction-to-board heat transfer. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 68μA enables >10-year battery life in always-on automotive modules (e.g., remote keyless entry receivers). |
| Windowed watchdog timer | Simultaneous detection of fast (tWDI < tWD1) and slow (tWDI > tWD2) WDI faults prevents spurious resets during ECU sleep/wake cycles. |
| Self-holding circuit support | HOLD input eliminates need for external latch or microcontroller GPIO retention - simplifies ignition-switch–driven power sequencing. |
| Reverse-battery protection driver | GATEP output drives pFET to block -14V reverse polarity without series diode losses, preserving system efficiency. |
| Adjustable reset & watchdog timeouts | CSRT/CSWT pins accept external capacitors to fine-tune reset (35μs–200ms) and watchdog (280ms–520ms) periods for specific µP requirements. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Powers MCU, CAN transceivers, and analog front-ends in gasoline/diesel engine control modules subjected to 80V load-dump transients and -40°C cold starts. IC Role / Device Role / Timing Role: Dual-output LDO with supervisory functions provides primary 5V rail (OUT2) and configurable 3.3V/5V core rail (OUT1), while RESET and watchdog ensure deterministic boot and runtime fault recovery. Use Value: 72V input range and 68μA IQ prevent brownout-induced MCU lockup during cranking; HOLD enables ignition-triggered power-on without software intervention. |
Use Scenario: Supplies vision processor, radar SoC, and sensor fusion MCU in forward collision warning and lane departure systems operating under hood temperatures up to +125°C. IC Role / Device Role / Timing Role: Regulator delivers stable 5V/3.3V rails with precise reset timing (50ms D3) and windowed watchdog to detect sensor data freeze or processor hang. Use Value: Thermal-enhanced TQFN package sustains 2.7W dissipation during sustained radar processing; PFI comparator enables graceful shutdown before battery depletion. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
|
Use Scenario: Manages power to door modules, lighting drivers, and LIN networks in vehicle body electronics with strict low-power sleep requirements. IC Role / Device Role / Timing Role: Dual LDO supplies 5V LIN transceiver and 3.3V microcontroller; ENABLE2 independently disables non-critical peripherals to reduce system IQ. Use Value: 27μA shutdown current extends battery life during weeks-long vehicle storage; adjustable PFI threshold supports multi-battery chemistries (LiFePO₄, AGM). |
Use Scenario: Powers cellular modem, GNSS receiver, and secure element in always-connected vehicle tracking units requiring 10+ year field deployment. IC Role / Device Role / Timing Role: Single-chip solution provides regulated power, brownout detection, and watchdog supervision - eliminating discrete supervisor ICs and reducing BOM count. Use Value: AEC-Q100 qualified operation ensures reliability over full automotive lifecycle; GATEP-driven pFET replaces lossy reverse-protection diodes, improving standby efficiency. |
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 |
|---|---|---|---|
| MAX6793TPWD3+ | No windowed watchdog; fixed 280ms watchdog timeout only; lacks WDS0/WDS1 pins. | Suitable for simpler ECU designs where only basic watchdog timeout is required, not MIN/MAX fault detection. | Select MAX6793TPWD3+ if windowed watchdog is unnecessary and cost reduction is prioritized. |
| TLV70733PDQNR | Single-output, 200mA, 2.5V–5.5V input only; no RESET, watchdog, HOLD, or automotive temp grade. | Limited to low-voltage infotainment accessories (e.g., USB hubs) - not viable for under-hood 12V/24V systems. | Only consider TLV70733PDQNR for non-automotive, low-input-voltage, non-supervisory applications. |
Compared with MAX6793TPWD3+, the MAX6791TPWD3+ adds windowed watchdog capability and WDS0/WDS1 configuration flexibility, enabling robust fault detection in safety-critical ECUs; versus TLV70733PDQNR, it delivers full automotive-grade supervision, 72V tolerance, and dual-rail capability essential for modern vehicle architectures.
Availability
The MAX6791TPWD3+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, body control modules, and telematics units requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6791TPWD3+ 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 engineered specifically for automotive power-supply supervision - integrating high-voltage LDO regulation, precision reset generation, windowed watchdog timers, and reverse-battery protection into a single compact package.
FAQ
What does the 'D3' suffix in MAX6791TPWD3+ indicate?
The 'D3' suffix in MAX6791TPWD3+ specifies a factory-programmed 50ms reset timeout period (tRP). This value is set by internal laser trimming and corresponds to the CSRT pin configuration option D3 in the datasheet's Table 2. It ensures consistent, repeatable reset assertion duration after power recovery - critical for deterministic microcontroller initialization in automotive ECUs.
Does MAX6791TPWD3+ support adjustable output voltage on both OUT1 and OUT2?
No. Only OUT1 supports adjustable output voltage (1.8V–11V) via the SET1 pin and external resistor divider. OUT2 is fixed at 5V and cannot be adjusted. This dual-mode architecture allows flexible core rail design (e.g., 3.3V MCU core) while providing a stable 5V auxiliary rail for transceivers and sensors - as confirmed in the Detailed Description and Pin Function tables.
How is the windowed watchdog configured on MAX6791TPWD3+?
The windowed watchdog on MAX6791TPWD3+ is configured using WDS0 and WDS1 pins: driving them to specific logic levels selects the watchdog window ratio (e.g., 8×, 16×, 64×). For example, WDS0 = high and WDS1 = low selects the 8× ratio, defining tWD1 and tWD2 thresholds. This configuration is exclusive to MAX6791/MAX6792 variants and is not available on MAX6793–MAX6796.
Can MAX6791TPWD3+ operate with a 42V input during load-dump conditions?
Yes. MAX6791TPWD3+ is explicitly rated for 5V to 72V input operation and has been characterized at VIN = 42V in Electrical Characteristics tables (e.g., supply current = 74μA typ). Its internal protection circuitry - including thermal shutdown, short-circuit limiting, and output overvoltage clamping - ensures reliable function during ISO 16750-2 load-dump transients without latch-up or degradation.
Is the HOLD function on MAX6791TPWD3+ compatible with 3.3V logic levels?
Yes. The HOLD input on MAX6791TPWD3+ is referenced to OUT1/OUT2 voltage and accepts logic-low signals down to 0.4V (VIL) regardless of whether OUT1 is set to 5V, 3.3V, or another preset. Its internal 2µA pullup to OUT1 ensures proper biasing even when driven by 3.3V GPIOs - making it fully interoperable with modern low-voltage microcontrollers in automotive domains.
MAX6791TPWD3+ 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:
- 1.665V, 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)
MAX6791TPWD3+ FAQ
1.How can I place an order for MAX6791TPWD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPWD3+ 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 MAX6791TPWD3+ reliable?
The price and inventory of MAX6791TPWD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPWD3+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPWD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPWD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPWD3+?
MAX6791TPWD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPWD3+ 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 MAX6791TPWD3+?
For technical support, including MAX6791TPWD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPWD3+ requirements.
6.How does Aetrix verify that MAX6791TPWD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPWD3+ 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 MAX6791TPWD3+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPWD3+?
All MAX6791TPWD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPWD3+, 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 MAX6791TPWD3+ part is unused and in its original packaging.
Return procedure for MAX6791TPWD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6791TPWD3+ 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…
