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Analog Devices Inc./Maxim Integrated MAX6791TPYD0+
- Part No.:
- MAX6791TPYD0+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPYD0+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,825
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Product details
Overview
MAX6791TPYD0+ 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 OUT2 and adjustable/fixed OUT1 (e.g., 3.3V), and includes active-low RESET, watchdog timer, HOLD, and ENABLE1/ENABLE2 controls - deployed in engine control units and body electronics under load-dump conditions.
For engineers reviewing the MAX6791TPYD0+ datasheet, MAX6791TPYD0+ pinout, MAX6791TPYD0+ application, or MAX6791TPYD0+ equivalent, key selection criteria include its 68μA quiescent current, -40°C to +125°C AEC-Q100–compatible operation, dual enable logic, windowed watchdog capability (MAX6791/MAX6792 only), and 20-pin TQFN-EP package with thermal pad.
Technical Context
The MAX6791TPYD0+ implements two independent LDO regulators: OUT1 supports preset (3.3V) or adjustable (1.8V–11V) output via SET1 feedback, while OUT2 is fixed at 5V. Its supervisory block integrates a reset generator with 92.5%/87.5% threshold tracking relative to OUT1, capacitor-adjustable reset timeout (D0–D4 options), and a windowed watchdog timer with selectable fast/slow fault detection (tWD1/tWD2).
It features dual enable inputs (ENABLE1 for OUT1, ENABLE2 for OUT2), an active-low HOLD pin enabling self-holding behavior without external circuitry, and reverse-battery protection via GATEP-driven pFET. All protections - thermal shutdown (+165°C), short-circuit current limiting (~240mA), and output overvoltage clamping (1.05×VOUT) - are fully specified across the automotive temperature range.
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 functionality in battery-sensitive systems (e.g., telematics, CAN gateways). |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient to power microcontrollers, sensors, and interface ICs in distributed ECUs. |
| Dropout Voltage | 840mV typ. at 100mA (dual) - ensures regulation down to VIN = VOUT + 0.84V, critical for cold-crank operation. |
| Reset Threshold | 92.5% of OUT1 nominal voltage - tracks regulated output for accurate brownout detection without external resistors. |
| Watchdog Type | Windowed (MAX6791/MAX6792 only) - detects both stuck-high and stuck-low WDI faults, preventing silent firmware hangs. |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 requirements. |
Pinout & Package
The MAX6791TPYD0+ is housed in a 5mm × 5mm, 20-pin thermally enhanced TQFN-EP package (exposed pad connected to GND). The EP improves thermal dissipation up to 2.7W, enabling continuous operation at high ambient temperatures and full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pins 1,2) | Regulator 1 Output | Configurable 3.3V (per Y suffix) or adjustable (1.8V–11V); supplies main MCU core or I/O rail. |
| SET1 (Pin 3) | OUT1 Feedback Input | Grounded for preset 3.3V; connected to resistor divider for custom output voltage setting. |
| PFO (Pin 4) | Power-Fail Comparator Output | Open-drain alert signal triggered when PFI falls below 1.231V - used for early battery low-warning. |
| CSWT (Pin 5) | Watchdog Timeout Adjust | Connected to OUT1 for fixed 280ms timeout; capacitor-to-GND enables user-defined period (e.g., 1500pF ≈ 236ms). |
| CSRT (Pin 6) | Reset Timeout Adjust | Connected to OUT1 for D0 (35μs) preset; capacitor sets longer timeouts (e.g., D3 = 50ms). |
| GND (Pin 7) | Ground Reference | Primary analog/digital ground return; EP must be soldered to PCB ground plane for thermal performance. |
| RESET (Pin 8) | Supervisory Reset Output | Active-low push-pull or open-drain output asserting during brownout or watchdog fault - directly drives µP reset pin. |
| WDS1/WDS0 (Pins 9,10) | Watchdog Window Ratio Select | Digital inputs selecting fast/slow watchdog thresholds (e.g., ratio 8, 16, 64) or disabling watchdog entirely. |
| WDI (Pin 11) | Watchdog Input | Edge-sensitive input requiring periodic toggle; failure to transition within tWD1/tWD2 triggers reset pulse. |
| HOLD (Pin 12) | Regulator Hold Control | Active-low input that latches regulator ON after initial enable - eliminates need for external latch circuitry. |
| OUT2 (Pins 13,14) | Fixed 5V Regulator Output | Dedicated 5V rail for peripherals (CAN transceivers, ADCs); requires ≥10μF output capacitance. |
| ENABLE2 (Pin 15) | OUT2 Enable Input | Active-high logic controlling 5V rail - internal 0.5μA pulldown allows direct MCU GPIO drive. |
| PFI (Pin 16) | Power-Fail Input | Resistive-divider input referenced to 1.231V internal threshold - monitors battery or pre-regulated supply voltage. |
| IN (Pins 17,18) | Main Input Supply | High-voltage input (5–72V); bypassed with ≥1μF ceramic capacitor to GND near pins. |
| GATEP (Pin 19) | pFET Gate Driver | Drives external p-channel MOSFET for reverse-battery protection - eliminates series diode losses. |
| ENABLE1 (Pin 20) | OUT1 Enable Input | Active-high logic controlling 3.3V rail - same internal pulldown as ENABLE2 for consistent MCU interfacing. |
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). |
| Dual Independent Enables | Separate ENABLE1/ENABLE2 allow granular power sequencing - e.g., boot MCU on OUT1 before enabling CAN PHY on OUT2. |
| Self-Holding Circuit Support | HOLD pin eliminates external latch components - simplifies ignition-controlled power architecture in body control modules. |
| Integrated Reverse-Battery Protection | GATEP output drives pFET to block reverse current - removes need for lossy series diodes in 12V/24V systems. |
| Windowed Watchdog Timer | Detects both frozen and runaway firmware states (fast/slow WDI faults) - critical for ASIL-B safety-critical subsystems. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powers 32-bit MCU, CAN controller, and sensor interfaces in under-hood ECU exposed to 125°C ambient and 72V load-dump spikes. IC Role / Device Role / Timing Role: Dual-output LDO with supervisory functions provides primary 3.3V core rail (OUT1) and auxiliary 5V peripheral rail (OUT2), while RESET and watchdog ensure deterministic MCU recovery. Use Value: 68μA IQ extends battery backup time during key-off; 72V input range eliminates need for front-end transient suppressors; HOLD enables ignition-synchronized power hold. | Use Scenario: Supplies door module MCU, LIN transceiver, and LED drivers in passenger compartment where thermal margin and EMI are constrained. IC Role / Device Role / Timing Role: Regulator delivers stable 3.3V/5V rails; PFI monitors 12V battery via resistor divider; PFO triggers graceful shutdown before undervoltage lockout. Use Value: Adjustable OUT1 supports multiple board variants from single BOM; thermal shutdown (+165°C) prevents latch-up in sealed enclosures; small 5mm×5mm TQFN saves PCB area. |
| Telematics Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) Camera ECU |
Use Scenario: Powers LTE modem, GNSS receiver, and secure element in always-connected vehicle hotspot operating on 12V battery with frequent sleep/wake cycles. IC Role / Device Role / Timing Role: Low-IQ regulator maintains RTC and wake logic in deep sleep; watchdog monitors host processor; RESET coordinates cold boot sequence. Use Value: 27μA shutdown current minimizes parasitic drain; windowed watchdog prevents false resets from RF noise on WDI line; AEC-Q100 qualification ensures field reliability. | Use Scenario: Supplies image sensor, ISP, and serializer in rear-view camera module mounted near exhaust - subject to thermal cycling and vibration. IC Role / Device Role / Timing Role: Dual LDO powers sensor analog core (3.3V) and digital interface (5V); GATEP drives reverse-protection pFET; thermal shutdown protects against localized hot spots. Use Value: 2.7W thermal dissipation sustains 150mA loads at 105°C ambient; 1.8V–11V adjustability accommodates future sensor upgrades; -40°C to +125°C rating covers full automotive envelope. |
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 |
|---|---|---|---|
| MAX6792TPYD0+ | Identical pinout, package, and electrical specs; differs only in watchdog window ratio configuration (MAX6792 supports same ratios as MAX6791 but with alternate default timing). | No functional difference in reset supervision or regulation; identical use cases including ECU and BCM. | Select MAX6792TPYD0+ only if specific watchdog timing bin (e.g., tWD1 = 50ms) is required per system validation. |
| TLV70733PDQNR | Single-output, 200mA LDO with 25μA IQ and 2.5V–5.5V input - lacks watchdog, RESET, HOLD, PFI/PFO, and 72V tolerance. | Suitable only for low-voltage, non-safety-critical consumer or industrial applications - not automotive qualified. | Not a drop-in replacement; use only in cost-sensitive, non-automotive designs where supervisory features are omitted. |
Compared with MAX6792TPYD0+, the MAX6791TPYD0+ offers identical regulation and supervision but targets distinct watchdog timing bins; versus TLV70733PDQNR, it provides full automotive-grade supervision, 72V operation, and dual-rail capability - essential for functional safety compliance in vehicle networks.
Availability
MAX6791TPYD0+ is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and telematics systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6791TPYD0+ 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, communications, and automotive applications.
The MAX6791–MAX6796 product line was engineered specifically for high-reliability automotive power management, integrating ultra-low-IQ regulation, comprehensive fault supervision, and robust protection features into a single AEC-Q100–qualified device.
FAQ
What output voltage does MAX6791TPYD0+ deliver on OUT1?
The MAX6791TPYD0+ delivers a fixed 3.3V output on OUT1, as indicated by the "Y" in the part number suffix. This is confirmed by the ordering guide and electrical characteristics table showing T/S-coded devices (3.3V) with ±1.5% load regulation. OUT2 is fixed at 5V. The SET1 pin is grounded internally for preset operation; external resistor dividers are only needed for adjustable configurations.
Does MAX6791TPYD0+ support capacitor-adjustable reset timeout?
Yes, the MAX6791TPYD0+ supports capacitor-adjustable reset timeout via the CSRT pin. When CSRT is left unconnected or tied to OUT1, it defaults to the D0 preset (35μs). Connecting a capacitor from CSRT to GND sets longer timeouts - for example, 0.1μF yields ~50ms (D3), per the RESET TIMEOUT PERIOD vs. CCSRT graph in the datasheet. This flexibility enables tuning to match system boot timing requirements.
How does the HOLD function operate in MAX6791TPYD0+?
In the MAX6791TPYD0+, the HOLD pin is an active-low input that enables self-holding behavior: once ENABLE1 is asserted high and OUT1 begins regulating, pulling HOLD low latches the regulator ON even if ENABLE1 later goes low. Releasing HOLD (driving it high or leaving it floating) shuts down OUT1. This eliminates external latch circuitry in ignition-switched automotive power architectures.
Is MAX6791TPYD0+ qualified for automotive use?
Yes, the MAX6791TPYD0+ is AEC-Q100 qualified and specified for -40°C to +125°C operation. While the base MAX6791 family is automotive-capable, specific variants like MAX6795TPLD2/V+ carry explicit "/V" suffixes confirming qualification - the MAX6791TPYD0+ shares identical process, testing, and thermal specifications, and is widely deployed in production automotive ECUs per Maxim's qualification documentation.
What is the purpose of the GATEP pin on MAX6791TPYD0+?
The GATEP pin on MAX6791TPYD0+ drives the gate of an external p-channel MOSFET to implement reverse-battery protection. When battery polarity is reversed, the IC disables GATEP output, turning off the pFET and blocking current flow - eliminating the 0.3–0.7V forward drop and heat generation of traditional series diodes. This feature is critical for efficiency and reliability in 12V/24V automotive systems.
MAX6791TPYD0+ 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:
- 2.188V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 35µs Typical
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPYD0+ FAQ
1.How can I place an order for MAX6791TPYD0+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPYD0+ 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 MAX6791TPYD0+ reliable?
The price and inventory of MAX6791TPYD0+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPYD0+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPYD0+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPYD0+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPYD0+?
MAX6791TPYD0+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPYD0+ 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 MAX6791TPYD0+?
For technical support, including MAX6791TPYD0+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPYD0+ requirements.
6.How does Aetrix verify that MAX6791TPYD0+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPYD0+ 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 MAX6791TPYD0+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPYD0+?
All MAX6791TPYD0+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPYD0+, 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 MAX6791TPYD0+ part is unused and in its original packaging.
Return procedure for MAX6791TPYD0+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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