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Analog Devices Inc./Maxim Integrated MAX6791TPYD3+
- Part No.:
- MAX6791TPYD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPYD3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,710
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Product details
Overview
The MAX6791TPYD3+ 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), operates from 5V to 72V input, consumes only 68μA quiescent current, and features a fixed 5V OUT2 and adjustable/fixed OUT1 (e.g., 3.3V). It is used in engine control units (ECUs) where load-dump resilience and low-power microcontroller supervision are critical.
For engineers reviewing the MAX6791TPYD3+ datasheet, MAX6791TPYD3+ pinout, MAX6791TPYD3+ application, or MAX6791TPYD3+ equivalent, key selection considerations include its 5mm × 5mm TQFN-20 package with exposed pad, dual enable inputs (ENABLE1/ENABLE2), HOLD self-hold functionality, 50ms reset timeout (D3), and 87.5% reset threshold for OUT1 - all validated for -40°C to +125°C operation.
Technical Context
The MAX6791TPYD3+ implements two independent LDO regulators: OUT1 supports fixed (3.3V, per "Y" suffix) or adjustable output (1.8V–11V via SET1), while OUT2 is a dedicated fixed 5V rail. Its supervisory block integrates a windowed watchdog timer (with selectable fast/slow fault detection), a power-fail comparator (PFI/PFO), and a push-pull or open-drain RESET output with capacitor-adjustable timeout.
It uses internal thermal shutdown (+165°C), short-circuit current limiting (~240mA per output), and output overvoltage protection (105–110% of VOUT). The HOLD input enables latch-up behavior without external components, and GATEP drives an external pFET for reverse-battery protection - critical for 12V/24V automotive systems enduring ISO 7637-2 transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump events without external clamping. |
| Quiescent Current | 68μA typical - enables always-on ECU modules meeting ISO 8859-3 sleep-current requirements. |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU core logic and CAN transceivers. |
| Dropout Voltage | 840mV typ at 100mA (dual mode) - maintains regulation down to VIN = 6.14V for 5V OUT2. |
| Reset Timeout | 50ms (D3 option) - ensures reliable µP initialization after brownout recovery. |
| Reset Threshold | 87.5% of nominal OUT1 voltage - matches "S" threshold code for 3.3V OUT1 → 2.888V trip point. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive environments. |
Pinout & Package
MAX6791TPYD3+ is housed in a 5mm × 5mm, 20-pin thermally enhanced TQFN-EP package with exposed pad (EP) connected internally to GND. The package supports up to 2.7W power dissipation and requires PCB thermal vias for sustained operation at high ambient temperatures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Main regulated output (3.3V fixed, per "Y" suffix); requires ≥10μF ceramic output capacitor. |
| 3 | SET1 | Feedback node for OUT1; grounded for fixed 3.3V, or connected to resistive divider for adjustable output. |
| 4 | PFO | Open-drain power-fail output; asserts low when PFI < 1.231V - used for early battery-low warning. |
| 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 for custom timing. |
| 7 | GND | Analog/digital ground reference; must be connected to low-impedance PCB plane. |
| 8 | RESET | Active-low reset output; push-pull type (per "P" suffix); drives µP reset pin directly. |
| 9,10 | WDS1, WDS0 | Windowed watchdog ratio select inputs; set to enable fast/slow fault detection per MAX6791 architecture. |
| 11 | WDI | Watchdog input; requires periodic edge transition within timeout window to prevent reset assertion. |
| 12 | HOLD | Active-low hold control; latches regulator ON even after ENABLE1 removal - enables ignition-key hold circuits. |
| 13,14 | OUT2 | Dedicated fixed 5V output; independent of OUT1; requires ≥10μF output capacitor. |
| 15 | ENABLE2 | Active-high enable for OUT2; pulled down internally (0.5μA sink) - driven high to activate 5V rail. |
| 16 | PFI | Power-fail comparator input; connected to resistor divider to set custom undervoltage threshold. |
| 17,18 | IN | Main input supply pins; bypassed with 1μF ceramic capacitor to GND each for stability. |
| 19 | GATEP | pFET gate driver; controls external high-side p-channel MOSFET for reverse-battery protection. |
| 20 | ENABLE1 | Active-high enable for OUT1; pulled down internally (0.5μA sink) - primary ON/OFF control. |
| EP | Exposed Pad | Internally connected to GND; must be soldered to thermal ground plane for junction temperature control. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current (68μA) | Enables >10-year battery life in always-on automotive modules compliant with ISO 11898-2 sleep-mode specs. |
| Dual independent outputs (OUT1 + OUT2) | Supports separate power domains: e.g., 3.3V for MCU core and 5V for legacy peripherals or sensors. |
| Windowed watchdog timer (MAX6791-specific) | Detects both stuck-high and stuck-low WDI faults - prevents silent firmware lockup in safety-critical ECUs. |
| HOLD input with self-latching behavior | Eliminates need for external latch circuitry when implementing ignition-switched power sequencing. |
| Integrated reverse-battery protection (GATEP) | Drives external pFET to block -14V/-28V reverse polarity - replaces lossy series diode solutions. |
| AEC-Q100 stress-tested (-40°C to +125°C) | Validated for under-hood deployment in passenger and commercial vehicles per automotive reliability standards. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Powering 32-bit ARM-based MCU and CAN FD transceiver in gasoline/diesel engine bay. IC Role / Device Role / Timing Role: Dual-output LDO provides isolated 3.3V (MCU core) and 5V (CAN PHY) rails; RESET monitors OUT1 to ensure deterministic boot after cranking. Use Value: Withstands 72V load-dump pulses without shutdown; 68μA IQ extends stop-start battery life; HOLD enables ignition-key-triggered latching. |
Use Scenario: Supplying image sensor, ISP, and gigabit Ethernet PHY in front-facing ADAS camera housing. IC Role / Device Role / Timing Role: Regulator supplies clean 3.3V to CMOS sensor and 5V to Ethernet magnetics; watchdog guards against ISP firmware hang during video streaming. Use Value: Windowed watchdog detects both frozen and oscillating WDI signals; thermal shutdown prevents field failure at +105°C ambient. |
| Body Control Module (BCM) | Electric Power Steering (EPS) Controller |
Use Scenario: Managing power for LIN gateway, door lock actuators, and interior lighting in vehicle body electronics. IC Role / Device Role / Timing Role: Provides 3.3V for LIN transceiver and 5V for relay drivers; PFI monitors 12V battery voltage for low-battery warning. Use Value: Adjustable PFI threshold enables customizable battery health alerting; 50ms reset timeout ensures robust MCU restart after voltage sag. |
Use Scenario: Powering torque-sensing ASIC, motor gate drivers, and safety MCU in EPS rack-mounted controller. IC Role / Device Role / Timing Role: Delivers fault-tolerant 3.3V and 5V rails; RESET output feeds functional safety monitor (FSM) to detect regulator undervoltage. Use Value: Output overvoltage protection (105–110% VOUT) safeguards downstream ASICs; AEC-Q100 qualification meets ASIL-B requirements. |
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 |
|---|---|---|---|
| MAX6792TPYD3+ | Same pinout, identical electrical specs, but includes windowed watchdog with programmable ratio (via WDS0/WDS1) - MAX6791 has fixed ratio mapping. | Preferred where fine-grained watchdog window tuning (e.g., 16:1 ratio) is required for ASIL-C diagnostics. | Select MAX6792TPYD3+ if full watchdog configurability is needed; otherwise MAX6791TPYD3+ offers cost-optimized windowed supervision. |
| TLV70733PDQNR | Single-output, 200mA, 2.5V–5.5V input, no watchdog/reset, SOT-23-5 package - lacks high-voltage capability and supervisory features. | Suitable only for low-voltage post-regulation (e.g., 3.3V from 5V rail), not direct replacement in 12V/24V automotive main supply. | Use TLV70733PDQNR only in non-safety, low-input-voltage secondary regulation; MAX6791TPYD3+ remains mandatory for primary 5V–72V automotive LDO needs. |
Compared with MAX6792TPYD3+, the MAX6791TPYD3+ offers identical dual-output performance and reset supervision but with fixed watchdog window ratios - simplifying design for applications requiring proven, unmodified fault-detection timing. Against TLV70733PDQNR, it provides full automotive-grade high-voltage operation, integrated safety monitoring, and dual-rail capability - making it irreplaceable in primary ECU power architectures.
Availability
MAX6791TPYD3+ is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, body control modules, and electric power steering controllers requiring stable component supply across extended temperature and high-reliability automotive programs.
Supply support for MAX6791TPYD3+ 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 family was engineered specifically for automotive power-supply supervision - integrating high-voltage LDO regulation, windowed watchdog timers, and reverse-battery protection into a single AEC-Q100-qualified package.
FAQ
What output voltage does MAX6791TPYD3+ deliver on OUT1?
The MAX6791TPYD3+ delivers a fixed 3.3V output on OUT1, as indicated by the "Y" in the part number per Maxim's ordering guide. This is confirmed in the Electrical Characteristics table (T/S option, 3.3V nominal), with tight tolerance (±1.2% at 1mA load) and guaranteed regulation across -40°C to +125°C. The SET1 pin is internally connected to GND for this preset configuration.
Does MAX6791TPYD3+ support adjustable reset timeout?
Yes, MAX6791TPYD3+ supports both fixed and adjustable reset timeout. The "D3" suffix specifies a factory-configured 50ms fixed timeout, achieved by connecting CSRT to OUT1. To adjust the timeout, disconnect CSRT from OUT1 and connect an external capacitor to GND - timeout scales linearly with capacitance (e.g., 150nF ≈ 50ms, per Figure 16 in datasheet).
Is MAX6791TPYD3+ pin-compatible with other MAX679x variants?
Yes, MAX6791TPYD3+ shares identical 20-pin TQFN-EP pinout and footprint with all MAX6791–MAX6796 devices, including MAX6792TPYD3+, MAX6793TPYD3+, and MAX6794TPYD3+. All share same IN, GND, RESET, ENABLE1/ENABLE2, HOLD, and OUT1/OUT2 pin assignments - enabling drop-in substitution for different output configurations or watchdog options.
What is the function of the GATEP pin on MAX6791TPYD3+?
The GATEP pin on MAX6791TPYD3+ drives the gate of an external p-channel MOSFET to implement reverse-battery protection. When battery polarity is inverted, GATEP pulls low to turn off the pFET, blocking current flow. This eliminates the 0.3–0.7V forward-drop and heat generation of traditional series diodes - improving efficiency and thermal margin in 12V/24V automotive systems.
How does the HOLD feature work in MAX6791TPYD3+?
In MAX6791TPYD3+, the HOLD pin enables self-latching behavior: when ENABLE1 is pulsed high to start regulation, then pulled low, asserting HOLD low *after* startup forces OUT1 to remain active indefinitely. Releasing HOLD (pulling high or leaving floating) shuts down OUT1. This replicates ignition-key latching without external components - a key requirement for automotive power sequencing.
MAX6791TPYD3+ 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:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPYD3+ FAQ
1.How can I place an order for MAX6791TPYD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPYD3+ 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 MAX6791TPYD3+ reliable?
The price and inventory of MAX6791TPYD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPYD3+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPYD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPYD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPYD3+?
MAX6791TPYD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPYD3+ 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 MAX6791TPYD3+?
For technical support, including MAX6791TPYD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPYD3+ requirements.
6.How does Aetrix verify that MAX6791TPYD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPYD3+ 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 MAX6791TPYD3+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPYD3+?
All MAX6791TPYD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPYD3+, 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 MAX6791TPYD3+ part is unused and in its original packaging.
Return procedure for MAX6791TPYD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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