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Analog Devices Inc./Maxim Integrated MAX6791TPLD1+
- Part No.:
- MAX6791TPLD1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPLD1+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:653
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Product details
Overview
MAX6791TPLD1+ from Maxim Integrated is a dual-output, ultra-low-quiescent-current linear regulator designed for automotive power management. It delivers up to 150mA per output (OUT1 and OUT2), supports 5V to 72V input range, features fixed 5V/3.3V/2.5V/1.8V or adjustable 1.8V–11V outputs, and integrates RESET, watchdog, HOLD, and ENABLE1/ENABLE2 functions. It operates across –40°C to +125°C and withstands load-dump conditions in vehicle ECUs.
For engineers reviewing the MAX6791TPLD1+ datasheet, MAX6791TPLD1+ pinout, MAX6791TPLD1+ application, or MAX6791TPLD1+ equivalent, this page provides verified technical context, pin-level circuit roles, automotive-grade thermal and protection specs, and validated alternative options for high-voltage micropower regulation with supervisory functions.
Technical Context
The MAX6791TPLD1+ implements two independent LDO regulators: OUT1 is adjustable (1.8V–11V) or preset (5V/3.3V/2.5V/1.8V) via SET1; OUT2 is fixed at 5V. Both regulate from 5V–72V input with 68μA quiescent current and include thermal, short-circuit, and overvoltage protection.
It integrates a windowed watchdog timer (with selectable min/max timeout ratios via WDS0/WDS1), active-low open-drain/push-pull RESET output referenced to 92.5%/87.5% of OUT1, capacitor-adjustable reset timeout (35μs–200ms), and HOLD functionality enabling self-holding without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without shutdown |
| Quiescent Current | 68μA typical - enables always-on operation in battery-sensitive systems |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU core + peripheral rails |
| Dropout Voltage | 840mV typ at 100mA - maintains regulation under high VIN/low VOUT conditions |
| Operating Temperature | –40°C to +125°C - fully specified for under-hood automotive environments |
| Reset Threshold | 92.5% of OUT1 nominal - ensures reliable microcontroller reset during brownout |
| Watchdog Timeout | 280ms min fixed or capacitor-adjustable - configurable fault detection timing |
Pinout & Package
MAX6791TPLD1+ uses a 20-pin thermally enhanced TQFN-EP package (5mm × 5mm, exposed pad). The EP is internally connected to GND and must be soldered to the PCB ground plane for optimal thermal performance (2.7W dissipation capability).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pins 1,2) | Regulator 1 Output | Primary regulated output: fixed (5V/3.3V/2.5V/1.8V) or adjustable (1.8V–11V); max 150mA |
| SET1 (Pin 3) | Feedback Input | Connect to GND for preset voltage; connect external resistor divider for adjustable output |
| PFO (Pin 4) | Power-Fail Comparator Output | Active-low open-drain signal asserting when PFI falls below 1.231V threshold |
| CSWT (Pin 5) | Watchdog Timeout Adjust | Connect to OUT1 for fixed 280ms timeout; add capacitor to GND for adjustable period |
| CSRT (Pin 6) | Reset Timeout Adjust | Connect to OUT1 for fixed timeout (35μs–200ms); capacitor sets user-defined delay |
| GND (Pin 7) | Ground Reference | Common return for all internal circuits and external capacitors |
| RESET (Pin 8) | Supervisory Reset Output | Active-low output asserting when OUT1 drops below reset threshold or watchdog faults |
| WDS1 & WDS0 (Pins 9,10) | Watchdog Window Ratio Select | Set min/max watchdog timing ratio (e.g., 8×, 16×, 64×) for MAX6791/MAX6792 variants |
| WDI (Pin 11) | Watchdog Input | Microcontroller pulse train input; missing edge within timeout triggers RESET assertion |
| HOLD (Pin 12) | Regulator Hold Control | Active-low input that latches regulator ON after initial enable, enabling self-hold circuits |
| OUT2 (Pins 13,14) | Regulator 2 Output | Fixed 5V output; independent of OUT1; max 150mA |
| ENABLE2 (Pin 15) | OUT2 Enable Input | Active-high control for OUT2; internal 0.5μA pulldown allows default OFF state |
| PFI (Pin 16) | Power-Fail Input | Resistive-divider input referenced to 1.231V comparator; used for battery or rail monitoring |
| IN (Pins 17,18) | Main Regulator Input | High-voltage input (5V–72V); bypass with ≥1μF capacitor to GND |
| GATEP (Pin 19) | pFET Gate Drive | Drives external p-channel MOSFET for reverse-battery protection (no diode drop) |
| ENABLE1 (Pin 20) | OUT1 Enable Input | Active-high control for OUT1; internal 0.5μA pulldown enables default OFF behavior |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | OUT1 (adjustable/fixed) + OUT2 (fixed 5V) support separate MCU core/peripheral domains |
| Windowed watchdog timer | Simultaneously detects fast (tWDI < tWD1) and slow (tWDI > tWD2) microcontroller hangs |
| HOLD + ENABLE1 logic | Enables ignition-key-triggered self-holding without external latch components |
| Reverse-battery protection drive | GATEP output controls external pFET to eliminate series diode loss and heat |
| AEC-Q100 alignment | –40°C to +125°C operation, thermal shutdown (+165°C), and automotive-grade reliability testing |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powering 32-bit MCU and CAN transceiver in engine compartment under wide temperature and load-dump conditions. IC Role / Device Role / Timing Role: Dual-output LDO providing isolated 3.3V (MCU core) and 5V (CAN PHY) rails with integrated reset supervision. Use Value: 68μA quiescent current prevents battery drain during key-off; 72V input tolerance eliminates need for upstream TVS clamping. | Use Scenario: Supplying door module microcontroller, LIN transceiver, and LED drivers in door panel assemblies. IC Role / Device Role / Timing Role: Single-chip power + supervision solution delivering 5V/150mA and 3.3V/150mA with watchdog and HOLD for wake-on-LIN. Use Value: HOLD input enables low-power wake-up from sleep mode without external latching circuitry. |
| Advanced Driver Assistance System (ADAS) Camera ECU | Automotive Infotainment Head Unit |
Use Scenario: Regulating image sensor and ISP power rails in rear-view camera modules exposed to under-hood temperatures. IC Role / Device Role / Timing Role: High-temperature LDO with thermal shutdown and output overvoltage protection (1.05×VOUT) for sensor supply integrity. Use Value: 125°C rating and 2.7W thermal dissipation allow continuous operation at ambient >105°C. | Use Scenario: Powering audio DSP, display controller, and USB interface in head unit mainboard with fail-safe reset sequencing. IC Role / Device Role / Timing Role: Supervisory regulator generating synchronized RESET pulses for multi-rail power-up and brownout recovery. Use Value: Fixed 92.5% reset threshold and capacitor-adjustable timeout ensure deterministic boot timing across voltage tolerances. |
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 |
|---|---|---|---|
| MAX6792TPLD1+ | Identical pinout and package; includes windowed watchdog with same WDS0/WDS1 ratio selection | Same functional scope but optimized for tighter watchdog timing windows (e.g., safety-critical diagnostics) | Select when precise min/max watchdog fault detection is required beyond basic timeout monitoring |
| TPS7B8750QKVURQ1 | Single-output 500mA LDO; no dual output, no windowed watchdog; includes enable, reset, and thermal shutdown | Higher current capacity but lacks second output and advanced watchdog features | Choose for higher-current single-rail needs where dual regulation and windowed supervision are unnecessary |
Compared with MAX6792TPLD1+, the MAX6791TPLD1+ offers identical dual-output architecture and HOLD/ENABLE logic but with standard (non-windowed) watchdog timing; versus TPS7B8750QKVURQ1, it trades higher current for dual-rail flexibility and advanced supervision-critical for space-constrained automotive modules requiring multiple regulated supplies.
Availability
MAX6791TPLD1+ is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera ECUs, and infotainment head units requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for MAX6791TPLD1+ 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 high-reliability automotive power systems, delivering micropower dual/single LDOs with integrated supervision, reverse-battery protection, and AEC-Q100-aligned thermal robustness.
FAQ
What output voltage options does the MAX6791TPLD1+ support?
The MAX6791TPLD1+ supports fixed output voltages of 5V, 3.3V, 2.5V, or 1.8V on OUT1, and a fixed 5V on OUT2. Additionally, OUT1 can be adjusted from 1.8V to 11V using an external resistive divider connected to SET1. The specific configuration for MAX6791TPLD1+ is factory-preset - its "L" suffix denotes 5V OUT1, and "D1" indicates a 3.125ms reset timeout period.
Does the MAX6791TPLD1+ include reverse-battery protection?
Yes, the MAX6791TPLD1+ integrates reverse-battery protection circuitry via its GATEP pin, which drives the gate of an external p-channel MOSFET. This eliminates the power loss and heat generation associated with traditional series diodes. The GATEP output is rated for ±12V differential relative to IN and supports full protection across the 5V–72V input range.
How does the HOLD function work on the MAX6791TPLD1+?
The HOLD input on the MAX6791TPLD1+ is an active-low signal that, when pulled low after initial enable, forces OUT1 to remain ON even if ENABLE1 is subsequently deasserted. Releasing HOLD (pulling high or leaving unconnected) shuts down OUT1. This enables self-holding circuits - such as ignition-triggered power-on - without external latches or discrete components, simplifying design in automotive modules.
Can the watchdog timer on the MAX6791TPLD1+ be disabled?
Yes, the watchdog timer on the MAX6791TPLD1+ can be disabled. For MAX6791/MAX6792 variants like this one, driving both WDS0 and WDS1 high disables the watchdog function. Alternatively, the WD-DIS pin (available on MAX6793–MAX6796) provides direct disable control - though MAX6791TPLD1+ relies on WDS0/WDS1 logic for disable functionality.
What is the thermal performance of the MAX6791TPLD1+ package?
The MAX6791TPLD1+ uses a 20-pin TQFN-EP package (5mm × 5mm) with an exposed pad thermally connected to GND. At TA = +70°C, it supports 2667mW continuous power dissipation, derating by 33.3mW/°C above that temperature. Its thermal design enables 2.7W dissipation, allowing sustained operation under high ambient temperature, high input voltage, and full 150mA load conditions - critical for under-hood automotive deployment.
MAX6791TPLD1+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 2.187ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPLD1+ FAQ
1.How can I place an order for MAX6791TPLD1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPLD1+ 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 MAX6791TPLD1+ reliable?
The price and inventory of MAX6791TPLD1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPLD1+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPLD1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPLD1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPLD1+?
MAX6791TPLD1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPLD1+ 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 MAX6791TPLD1+?
For technical support, including MAX6791TPLD1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPLD1+ requirements.
6.How does Aetrix verify that MAX6791TPLD1+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPLD1+ 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 MAX6791TPLD1+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPLD1+?
All MAX6791TPLD1+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPLD1+, 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 MAX6791TPLD1+ part is unused and in its original packaging.
Return procedure for MAX6791TPLD1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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