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Analog Devices Inc./Maxim Integrated MAX6791TPLD4+
- Part No.:
- MAX6791TPLD4+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPLD4+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,232
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Product details
Overview
MAX6791TPLD4+ from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive systems requiring robust operation under load-dump conditions (5V–72V input). It delivers up to 150mA per output, features a fixed 5V OUT1 and adjustable or preset OUT2 (1.8V–5V), includes push-pull RESET with 200ms timeout (D4), and operates across –40°C to +125°C.
For engineers reviewing the MAX6791TPLD4+ datasheet, MAX6791TPLD4+ pinout, MAX6791TPLD4+ application, or MAX6791TPLD4+ equivalent, this page provides verified technical context, exact pin functionality, automotive-grade thermal performance (2.7W dissipation in 5mm × 5mm TQFN), reset/watchdog timing validation, and real-world substitution guidance for AEC-Q100-aligned designs.
Technical Context
The MAX6791TPLD4+ implements two independent LDO regulators: OUT1 (fixed 5V, 150mA) and OUT2 (preset 5V, 150mA), both supported by internal 1.231V reference and precision SET1 feedback. Its supervisory block integrates a windowed watchdog timer (with WDS0/WDS1-selectable ratios), capacitor-adjustable reset timeout (CSRT = D4 → 200ms), and active-low push-pull RESET that asserts when either output drops below 92.5% of nominal voltage.
It supports reverse-battery protection via GATEP-driven pFET, includes HOLD-enabled self-holding circuitry (no external components required), and features PFI/PFO comparator for programmable power-fail detection (1.231V threshold, 35µs delay). All protections - thermal shutdown (+165°C), short-circuit current limiting (240mA), and output overvoltage clamping (1.05×VOUT) - are fully specified across the full 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 ECU modules with ultra-low standby power. |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for microcontroller core/logic rails in body control modules. |
| Reset Timeout | 200ms (D4 option) - ensures reliable μP initialization after brownout recovery in infotainment systems. |
| Dropout Voltage | 840mV typ at 100mA (dual mode) - maintains regulation down to VIN = 5.84V for 5V outputs. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive environments per AEC-Q100 stress requirements. |
| Package Thermal Dissipation | 2.7W in 5mm × 5mm TQFN-EP - sustains continuous operation at high ambient + high VIN + full load. |
Pinout & Package
MAX6791TPLD4+ is housed in a thermally enhanced 20-pin TQFN-EP (5mm × 5mm, exposed pad), rated for continuous operation up to +125°C ambient. The exposed pad (EP) must be soldered to PCB ground plane for optimal thermal performance (θJA = 30°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 | OUT1 | Dual-mode regulator output: fixed 5V or adjustable (1.8V–11V); supplies primary MCU rail; requires ≥10μF ceramic output cap. |
| 3 | SET1 | Feedback node for OUT1; grounded for preset 5V, 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 or graceful shutdown. |
| 5 | CSWT | Watchdog timeout adjust; tied to OUT1 for fixed 280ms timeout or capacitor-grounded for user-defined period. |
| 6 | CSRT | Reset timeout adjust; tied to OUT1 for D4-coded 200ms timeout (per Table 2); critical for deterministic μP reset hold time. |
| 7 | GND | Analog/digital ground reference; connects internally to exposed pad (EP) - must be low-impedance PCB plane. |
| 8 | RESET | Active-low push-pull reset output; asserts when OUT1/OUT2 < 92.5% nominal; drives μP reset directly without pull-up. |
| 9,10 | WDS1, WDS0 | Windowed watchdog ratio select inputs; set fast/slow fault thresholds (tWD1/tWD2) - unused in MAX6791TPLD4+ default config. |
| 11 | WDI | Watchdog input; requires edge transition within timeout window to prevent RESET assertion - ties to MCU GPIO. |
| 12 | HOLD | Active-low hold enable; forces OUT1 ON even if ENABLE1 is deasserted - enables ignition-key-triggered self-hold circuits. |
| 13,14 | OUT2 | Fixed 5V secondary output; independent of OUT1; supplies CAN transceivers or sensor interfaces. |
| 15 | ENABLE2 | Active-high enable for OUT2; allows independent power sequencing of secondary rail. |
| 16 | PFI | Power-fail comparator input; referenced to 1.231V internal threshold - used with resistor divider to monitor battery or pre-regulated supply. |
| 17,18 | IN | Main regulator input; accepts 5V–72V; bypassed with ≥1μF ceramic cap to GND near pins. |
| 19 | GATEP | pFET gate drive output; controls external high-side p-channel MOSFET for reverse-battery protection (no diode drop). |
| 20 | ENABLE1 | Active-high enable for OUT1; internally pulled down (0.5μA); driven by ignition switch or system controller. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 150mA LDOs | Enables split-rail power for MCU + peripheral ICs (e.g., 5V MCU core + 5V CAN transceiver) with no cross-load interaction. |
| 200ms fixed reset timeout (D4) | Guarantees μP reset pulse width exceeds minimum requirement of automotive-grade MCUs (e.g., Infineon AURIX™, NXP S32K). |
| HOLD + ENABLE1 self-holding logic | Eliminates need for external latch circuitry in ignition-controlled modules - reduces BOM count and layout area. |
| Reverse-battery protection via GATEP | Drives external pFET to achieve <50mV forward drop vs. >700mV Schottky diode solution - improves cold-cranking efficiency. |
| AEC-Q100 qualified operating range | Validated for –40°C to +125°C junction temperature - meets TS 16949 requirements for engine control units and ADAS sensors. |
Applications
| Body Control Module (BCM) | Infotainment Power Supply |
|---|---|
|
Use Scenario: Centralized power management for door locks, lighting, and HVAC actuators in 12V/24V commercial vehicles. IC Role / Device Role / Timing Role: Dual 5V LDO provides isolated, noise-immune rails for MCU and LIN transceivers; RESET ensures deterministic boot after battery disconnect/reconnect. Use Value: 68μA quiescent current prevents parasitic drain during vehicle sleep mode; 72V tolerance eliminates need for upstream TVS in cost-sensitive BCM designs. |
Use Scenario: Powering display controller, audio codec, and USB PHY in automotive head units with strict EMC and thermal constraints. IC Role / Device Role / Timing Role: OUT1 powers ARM Cortex-A53 core (5V→3.3V LDO cascade), OUT2 supplies 5V USB VBUS; 200ms RESET guarantees safe firmware load after cold start. Use Value: 2.7W package dissipation sustains full load at +85°C ambient; GATEP-driven pFET replaces lossy series diode, improving thermal margin by 12°C. |
| Advanced Driver Assistance Systems (ADAS) Sensor Hub | Telematics Control Unit (TCU) |
|
Use Scenario: Powering radar SoC, camera ISP, and CAN FD interface in compact front-end sensor fusion module. IC Role / Device Role / Timing Role: Dual 5V outputs feed separate domains (radar analog front-end + digital processing); HOLD enables ignition-synchronized wake-up without MCU intervention. Use Value: Windowed watchdog (enabled via WDS0/WDS1) detects both stuck and runaway MCU states - critical for ISO 26262 ASIL-B compliance. |
Use Scenario: Always-on cellular modem and GNSS receiver in fleet management TCUs requiring 10-year field life and zero maintenance. IC Role / Device Role / Timing Role: Primary LDO powers LTE modem (150mA peak), secondary powers GPS RF front-end; PFI monitors backup supercap voltage for graceful shutdown. Use Value: 1.231V PFI threshold with 0.5% hysteresis enables precise low-battery detection; shutdown current <27μA extends supercap runtime by 3.2× vs. legacy regulators. |
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 |
|---|---|---|---|
| MAX6792TPLD4+ | Identical pinout, package, and electrical specs; differs only in watchdog configuration - supports windowed watchdog with selectable tWD1/tWD2 ratios. | Required where ISO 26262 ASIL-B mandates dual-fault detection (fast/slow WDI timeout violation), not just single timeout expiration. | Select MAX6792TPLD4+ when windowed watchdog behavior is explicitly required; otherwise MAX6791TPLD4+ suffices for standard reset supervision. |
| TPS7B8750QKVURQ1 | Single-output 500mA LDO (vs. dual 150mA); 35μA IQ; 4.5V–40V input; no integrated watchdog or PFI; push-pull RESET with 200ms timeout. | Suitable for simpler systems needing only one regulated rail and basic reset - lacks dual output, power-fail monitoring, and HOLD function. | Choose TPS7B8750QKVURQ1 only when dual output, PFI, or self-hold capability are unnecessary and higher output current is needed. |
Compared with MAX6792TPLD4+, the MAX6791TPLD4+ omits windowed watchdog logic but retains identical reset timing, thermal performance, and dual-rail capability - making it optimal for cost-sensitive, non-ASIL applications. Versus TPS7B8750QKVURQ1, MAX6791TPLD4+ adds critical automotive features (dual output, PFI, HOLD, GATEP) at the expense of higher IQ and lower max current.
Availability
MAX6791TPLD4+ is available at Aetrix Electronics and suitable for automotive body electronics, infotainment power systems, and ADAS sensor hubs requiring stable component supply, AEC-Q100 alignment, and long-term production continuity.
Supply support for MAX6791TPLD4+ 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 high-reliability analog and mixed-signal ICs for automotive, industrial, and communications markets, emphasizing ruggedness, precision, and integration.
The MAX6791–MAX6796 family targets automotive power management with integrated supervision - combining high-voltage LDOs, watchdog timers, reset generators, and reverse-battery protection in a single AEC-Q100-qualified package.
FAQ
What output voltage options does the MAX6791TPLD4+ support?
The MAX6791TPLD4+ supports fixed 5V on both OUT1 and OUT2 outputs. Its part number suffix "L" indicates the 5V preset option for OUT1, and "D4" specifies the 200ms reset timeout - not an output voltage code. Adjustable operation (1.8V–11V) is possible via SET1 feedback, but the MAX6791TPLD4+ is factory-configured for dual 5V outputs. Output accuracy is ±2.5% over temperature and line/load.
Does the MAX6791TPLD4+ include reverse-battery protection?
Yes, the MAX6791TPLD4+ integrates reverse-battery protection via its GATEP pin, which drives the gate of an external p-channel MOSFET. This eliminates the power loss and heat generation of a series Schottky diode. When reverse polarity is applied, the internal circuitry disables GATEP, turning off the pFET and blocking current flow - protecting downstream circuitry without external components beyond the MOSFET.
How is the 200ms reset timeout implemented in the MAX6791TPLD4+?
The MAX6791TPLD4+ uses the "D4" suffix to denote a factory-programmed 200ms reset timeout period. Internally, this is achieved by connecting CSRT (pin 6) to OUT1, enabling the fixed timeout mode. The device's internal ramp generator and comparator produce a precise 200ms (min) assertion of the push-pull RESET signal after OUT1 recovers above its 92.5% threshold - ensuring compatibility with automotive MCU reset timing requirements.
Can the MAX6791TPLD4+ be used in AEC-Q100-compliant designs?
Yes, the MAX6791TPLD4+ is built on an AEC-Q100-qualified process and specified for –40°C to +125°C operation. While the base MAX6791–MAX6796 family is AEC-Q100 qualified, the MAX6791TPLD4+ itself carries the "/V" automotive qualification marker in related variants (e.g., MAX6795TPLD2/V+). Its thermal design (2.7W in TQFN), wide input range (5V–72V), and integrated protections align fully with AEC-Q100 Grade 0/1 requirements for under-hood use.
What is the role of the HOLD pin on the MAX6791TPLD4+?
The HOLD pin (pin 12) on the MAX6791TPLD4+ enables self-holding circuitry: when asserted low after initial power-up, it keeps OUT1 enabled even if ENABLE1 is subsequently deasserted. This allows ignition-switch-triggered power sequencing without external latches. HOLD is internally pulled up to OUT1 via a 2μA current source - if unused, it may be left floating or tied to OUT1 for standard enable behavior.
MAX6791TPLD4+ 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:
- 4.625V, 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)
MAX6791TPLD4+ FAQ
1.How can I place an order for MAX6791TPLD4+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPLD4+ 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 MAX6791TPLD4+ reliable?
The price and inventory of MAX6791TPLD4+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPLD4+ is usually 5 days.
3.What payment methods are accepted for MAX6791TPLD4+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPLD4+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPLD4+?
MAX6791TPLD4+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPLD4+ 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 MAX6791TPLD4+?
For technical support, including MAX6791TPLD4+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPLD4+ requirements.
6.How does Aetrix verify that MAX6791TPLD4+ is sourced from the original manufacturer or authorized distributors?
All MAX6791TPLD4+ 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 MAX6791TPLD4+ meets industry standards.
7.What is the process for return or replacement of MAX6791TPLD4+?
All MAX6791TPLD4+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPLD4+, 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 MAX6791TPLD4+ part is unused and in its original packaging.
Return procedure for MAX6791TPLD4+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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