My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6791TPSD4+T
- Part No.:
- MAX6791TPSD4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPSD4+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,882
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6791TPSD4+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 fixed 5V OUT2), operates from 5V to 72V input, consumes only 68μA quiescent current, and features a capacitor-adjustable 200ms reset timeout (D4 option) - enabling robust brownout recovery in engine control units.
For engineers reviewing the MAX6791TPSD4+T datasheet, MAX6791TPSD4+T pinout, MAX6791TPSD4+T application, or MAX6791TPSD4+T equivalent, key selection criteria include its dual-enable architecture (ENABLE1/ENABLE2), HOLD self-hold functionality, windowed watchdog capability (MAX6791-specific), and AEC-Q100-qualified thermal performance up to +125°C in automotive under-hood environments.
Technical Context
The MAX6791TPSD4+T implements two independent LDO regulators: OUT1 supports preset (5V/3.3V/2.5V/1.8V) or adjustable (1.8V–11V) output via SET1 feedback, while OUT2 provides a fixed 5V rail. Its supervisory block integrates a reset generator with 92.5%/87.5% threshold tracking relative to OUT1, and a windowed watchdog timer with selectable fast/slow fault detection (tWD1/tWD2).
Control logic includes dual active-high enables (ENABLE1 for OUT1, ENABLE2 for OUT2), an active-low HOLD input that sustains regulation after ENABLE removal, and reverse-battery protection via GATEP-driven pFET - all operating across –40°C to +125°C with thermal shutdown at +165°C and hysteresis of 20°C.
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 modules with <100μA sleep-mode draw |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for microcontroller core + peripheral rails |
| Reset Timeout | 200ms (D4 option, capacitor-adjustable) - ensures reliable µP initialization after voltage recovery |
| Dropout Voltage | 840mV typ @ 100mA (dual mode) - maintains regulation during cold-crank battery dips to 6V |
| Operating Temp | –40°C to +125°C - fully specified for under-hood automotive placement |
| Reset Threshold | 92.5% of OUT1 nominal - tracks output voltage for accurate undervoltage detection |
Pinout & Package
MAX6791TPSD4+T is housed in a thermally enhanced 20-pin TQFN-EP package (5mm × 5mm, exposed pad), rated for 2.7W continuous dissipation at +70°C ambient. The exposed pad must be soldered to PCB ground for optimal thermal performance and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT1 | Regulator 1 output | Configurable 1.8V–11V or preset voltage; requires ≥10μF ceramic output capacitor |
| 3 - SET1 | Feedback input | Ground for preset outputs; connects to resistive divider for adjustable VOUT1 |
| 4 - PFO | Power-fail comparator output | Open-drain alert when PFI falls below 1.231V - used for early battery low warning |
| 5 - CSWT | Watchdog timeout adjust | Connect to OUT1 for fixed 280ms timeout; add capacitor for adjustable period |
| 6 - CSRT | Reset timeout adjust | Connected to OUT1 for D4 (200ms) fixed timeout; capacitor sets custom duration |
| 7 - GND | Ground reference | Primary return path; ties to exposed pad for thermal conduction |
| 8 - RESET | Active-low reset output | Push-pull or open-drain; asserts low during OUT1 undervoltage or watchdog fault |
| 9, 10 - WDS1/WDS0 | Window ratio select | Set fast/slow watchdog thresholds (MAX6791-specific); both high disables watchdog |
| 11 - WDI | Watchdog input | Edge-triggered; toggling within tWD1/tWD2 window prevents reset assertion |
| 12 - HOLD | Regulator hold control | Active-low; sustains OUT1/OUT2 after ENABLE1/ENABLE2 removal - enables self-hold circuits |
| 13, 14 - OUT2 | Fixed 5V regulator output | Dedicated 5V rail; requires ≥10μF output capacitor; not adjustable |
| 15 - ENABLE2 | OUT2 enable input | Active-high; internal 0.5μA pulldown - enables independent control of second output |
| 16 - PFI | Power-fail comparator input | Resistive-divider input referenced to 1.231V - sets custom brownout threshold |
| 17, 18 - IN | Main input supply | Accepts 5V–72V; bypass with ≥1μF ceramic capacitor to GND |
| 19 - GATEP | pFET gate driver | Drives external p-channel MOSFET for reverse-battery protection - eliminates series diode loss |
| 20 - ENABLE1 | OUT1 enable input | Active-high; internal 0.5μA pulldown - allows ignition-switched startup sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Enables detection of both stuck-high and stuck-low µP clock faults (MAX6791-specific) |
| Dual independent enables | Allows separate sequencing of OUT1 (core logic) and OUT2 (peripherals) in multi-rail systems |
| HOLD self-hold circuitry | Eliminates need for external latch components - reduces BOM count and board space |
| Reverse-battery protection | GATEP output drives pFET to block –12V to –24V reverse polarity - no forward voltage drop |
| Thermal & overcurrent protection | Shuts down at +165°C with 20°C hysteresis and limits short-circuit current to 200–240mA |
| AEC-Q100 qualification | Validated for automotive Grade 0 (–40°C to +125°C) - meets stress test requirements for ECU use |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powers MCU, CAN transceiver, and sensor interface ICs in gasoline/diesel engine compartments where ambient temperatures exceed +105°C and battery voltage swings from 5.5V (cold crank) to 72V (load dump). IC Role / Device Role / Timing Role: Dual-output LDO with supervisory functions - provides stable 3.3V core and 5V I/O rails while monitoring system health via RESET and watchdog. Use Value: 68μA quiescent current extends battery life in parked vehicle modes; 72V tolerance avoids external TVS clamping; HOLD enables ignition-key-triggered latching without external circuitry. | Use Scenario: Supplies power to door module microcontrollers, LIN transceivers, and LED drivers in vehicle door panels exposed to wide temperature cycling and vibration. IC Role / Device Role / Timing Role: High-reliability voltage supervisor and regulator - delivers regulated 5V/3.3V and generates reset pulses during battery disconnect/reconnect events. Use Value: PFI comparator enables programmable low-battery warning; GATEP-driven pFET eliminates reverse-polarity damage risk during service; AEC-Q100 qualification ensures long-term field reliability. |
| Advanced Driver Assistance Systems (ADAS) Camera ECU | Automotive Infotainment Power Sequencing |
Use Scenario: Powers image sensor, ISP, and video encoder in front-facing ADAS cameras mounted behind windshield - subject to thermal stress and EMI from nearby RF sources. IC Role / Device Role / Timing Role: Dual LDO with integrated reset and watchdog - supplies clean 1.8V sensor core and 3.3V interface rails while asserting RESET on voltage sag or software hang. Use Value: Low dropout (840mV @100mA) maintains regulation during transient battery dips; 5mm×5mm TQFN minimizes PCB footprint; exposed pad improves thermal coupling to heatsink layer. | Use Scenario: Manages power-up/down sequencing for head unit SoC, audio codec, and display controller - requiring precise voltage ramp timing and fault isolation. IC Role / Device Role / Timing Role: Programmable supervisory regulator - uses ENABLE1/ENABLE2 to stagger startup and HOLD to maintain state during brief supply interruptions. Use Value: Adjustable reset timeout (200ms D4) aligns with SoC boot time requirements; dual enable inputs support flexible power-tree control; 125°C rating accommodates enclosed dashboard environments. |
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+T | Same pinout and electrical specs, but includes windowed watchdog with additional SET ratio options (8/16/64) and faster tWD1 minima | Better suited for safety-critical applications requiring tighter watchdog window control and faster fault response | Select MAX6792TPSD4+T if windowed watchdog timing granularity or sub-50ms fast timeout is required |
| TLV70733PDQNR | Single-output, 300mA, 2.5V–5.5V input, 25μA IQ - lacks watchdog, reset timeout adjust, and automotive temp range | Limited to low-voltage, non-automotive applications like portable instrumentation or industrial sensors | Only consider TLV70733PDQNR for cost-sensitive, non-automotive designs with narrow input range and no supervision needs |
Compared with MAX6792TPSD4+T, the MAX6791TPSD4+T offers identical dual-regulator performance and reset functionality but with fewer watchdog window options; versus TLV70733PDQNR, it provides full 5V–72V operation, dual outputs, and automotive-grade supervision - making it irreplaceable for under-hood ECU power design.
Availability
MAX6791TPSD4+T is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera ECUs, and infotainment systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6791TPSD4+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 management with ultra-low IQ, high-input-voltage LDOs integrating reset, watchdog, and reverse-battery protection - specifically engineered for ECU and body electronics in harsh under-hood environments.
FAQ
What output voltage options does the MAX6791TPSD4+T support?
The MAX6791TPSD4+T supports preset output voltages of 5V, 3.3V, 2.5V, or 1.8V on OUT1, and a fixed 5V on OUT2. OUT1 can also be adjusted from 1.8V to 11V using an external resistor divider connected to SET1. The "S" in MAX6791TPSD4+T indicates a 3.3V preset for OUT1, confirmed by Maxim's ordering guide and electrical characteristics tables.
How is the 200ms reset timeout (D4) implemented in the MAX6791TPSD4+T?
The D4 suffix denotes a factory-configured 200ms reset timeout period. This is achieved by internally connecting CSRT to OUT1, selecting the fixed D4 option per Table 2 in the datasheet. No external capacitor is required - the timing is trimmed during production and remains stable across –40°C to +125°C with ±30% variation.
Does the MAX6791TPSD4+T include reverse-battery protection, and how is it used?
Yes, the MAX6791TPSD4+T includes reverse-battery protection via the GATEP pin, which drives the gate of an external p-channel MOSFET. When battery polarity is reversed, GATEP pulls low to block current flow - eliminating the need for lossy series diodes. The GATEP clamp voltage is specified at 13.8V–18.8V, ensuring safe MOSFET gate drive under fault conditions.
Can the watchdog timer in the MAX6791TPSD4+T be disabled?
Yes, the watchdog timer in the MAX6791TPSD4+T can be disabled. For MAX6791 variants, drive both WDS0 and WDS1 high to disable the watchdog function. Alternatively, the WD-DIS pin (available on MAX6793–MAX6796) is not present on MAX6791TPSD4+T, so WDS0/WDS1 control is the sole method - confirmed in the functional diagram and watchdog timer section of the datasheet.
What is the purpose of the HOLD pin on the MAX6791TPSD4+T, and how does it interact with ENABLE1?
The HOLD pin on the MAX6791TPSD4+T is an active-low input that sustains regulator operation after ENABLE1 is removed - enabling self-holding circuits without external components. When HOLD is pulled low *after* ENABLE1 has turned on OUT1, releasing ENABLE1 does not shut down OUT1. Only releasing HOLD (pulling it high or leaving unconnected) terminates regulation - a critical feature for ignition-switched automotive subsystems.
MAX6791TPSD4+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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPSD4+T FAQ
1.How can I place an order for MAX6791TPSD4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPSD4+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 MAX6791TPSD4+T reliable?
The price and inventory of MAX6791TPSD4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPSD4+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPSD4+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPSD4+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPSD4+T?
MAX6791TPSD4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPSD4+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 MAX6791TPSD4+T?
For technical support, including MAX6791TPSD4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPSD4+T requirements.
6.How does Aetrix verify that MAX6791TPSD4+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPSD4+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 MAX6791TPSD4+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPSD4+T?
All MAX6791TPSD4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPSD4+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 MAX6791TPSD4+T part is unused and in its original packaging.
Return procedure for MAX6791TPSD4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6791TPSD4+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…
