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Analog Devices Inc./Maxim Integrated MAX6471TA18AD3+
- Part No.:
- MAX6471TA18AD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6471TA18AD3+.pdf
- Description:
- IC REG LINEAR LDO WITH MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:1,738
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Product details
Overview
MAX6471TA18AD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 1.8V output, ±2.0% accuracy over temperature, 82µA quiescent current, and 150ms minimum reset timeout. It features active-low manual reset input (MR), push-pull RESET output, and operates from -40°C to +85°C in 8-pin TDFN package - ideal for battery-powered portable electronics requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6471TA18AD3+ datasheet, MAX6471TA18AD3+ pinout, MAX6471TA18AD3+ application, or MAX6471TA18AD3+ equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed reset behavior (150ms timeout, -7.5% threshold), thermal shutdown (180°C), and real-world use cases in handheld instruments and wireless modules - all extracted from Maxim's official datasheet Rev 5 (12/07).
Technical Context
The MAX6471TA18AD3+ integrates a precision LDO regulator core with a dedicated reset supervisor sharing the same voltage reference. Its MR pin enables external assertion of reset while VOUT remains within specification, and RESET remains asserted for exactly 150ms after MR release - critical for deterministic processor initialization in portable systems.
This variant belongs to the MAX6471–MAX6474/MAX6479–MAX6482 subgroup, confirming manual reset support, no SET pin (replaced by FB in other variants), and absence of remote sense or adjustable output capability. It uses the -7.5% reset threshold (suffix 'A') and 150ms timeout (suffix 'D3'), with push-pull RESET output and active-low SHDN control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2.0% over -40°C to +85°C - ensures stable core logic supply for low-voltage microcontrollers. |
| Max Output Current | 300mA guaranteed - sufficient to power SoCs, RF transceivers, or sensor subsystems without external boost. |
| Dropout Voltage | 114mV at 300mA load - enables operation down to VIN = 1.914V, extending battery runtime in single-cell Li-ion or alkaline systems. |
| Quiescent Current | 82µA typical - minimizes standby drain, enabling multi-week shelf life in always-on IoT edge nodes. |
| Reset Timeout | 150ms minimum - meets JEDEC JESD78 requirements for microprocessor reset hold time during power ramp-up. |
| Reset Threshold | -7.5% of nominal VOUT (1.665V) - triggers RESET before supply falls below µP VDD tolerance, preventing undefined execution. |
| Shutdown Current | 0.1µA typical - reduces system-level leakage to negligible levels during deep sleep modes. |
| Input Voltage Range | 2.5V to 5.5V - compatible with USB, Li-ion, and multi-cell battery inputs without pre-regulation. |
Pinout & Package
MAX6471TA18AD3+ is housed in an 8-pin TDFN package (3mm × 3mm, 0.5mm pitch) with exposed paddle (EP) internally connected to GND for thermal management. Pin 1 is IN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is RESET; Pin 5 is MR; Pin 6 is OUT; Pins 7–8 are NC (no connect); EP must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input | Accepts 2.5V–5.5V supply; bypass to GND with 0.1µF ceramic capacitor for stability. |
| 2 (GND) | Ground reference & thermal path | Electrical return and primary heat sink - must connect to large copper area or ground plane. |
| 3 (SHDN) | Active-low shutdown control | Pull low to disable regulator (IQ ≤ 0.1µA); tie to IN for normal operation. |
| 4 (RESET) | Active-low push-pull reset output | Drives µP reset pin directly; asserts low during power-up, brownout, or MR activation; holds for 150ms min. |
| 5 (MR) | Active-low manual reset input | Asserts RESET when pulled low; internal 40kΩ pullup to VOUT - supports switch or logic-driven reset initiation. |
| 6 (OUT) | Regulated 1.8V output | Delivers up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for stability and transient response. |
| 7–8 (NC) | No connect | Not bonded; leave unconnected per Maxim design guidelines. |
| EP | Exposed thermal paddle | Internally tied to GND; mandatory solder connection to PCB ground plane for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated microprocessor reset | Eliminates need for discrete supervisor IC - reduces BOM count and board space in compact portable designs. |
| Manual reset input (MR) | Enables field-serviceable or user-initiated system reset without power cycling - critical for embedded diagnostics and firmware updates. |
| 150ms reset timeout | Guarantees µP clock and memory stabilization before release - prevents race conditions in ARM Cortex-M or RISC-V boot sequences. |
| Thermal shutdown (180°C) | Protects against sustained overload or poor heatsinking - auto-restarts after 20°C hysteresis, enabling fault-tolerant operation. |
| Reverse current protection | 0.01µA typical OUT-to-IN leakage - prevents backup battery discharge when main supply is removed in dual-power systems. |
| Low dropout at full load | 114mV dropout at 300mA ensures usable headroom even with aging batteries or high-current transients. |
Applications
| Handheld Instruments | Wireless Modules |
|---|---|
|
Use Scenario: Powering ARM-based PDAs with real-time OS, touch controller, and SD card interface. IC Role / Device Role / Timing Role: Primary 1.8V core supply with synchronized reset assertion during battery insertion or low-VBAT recovery. Use Value: Prevents boot corruption by holding µP in reset until VOUT stabilizes above 1.665V and remains valid for ≥150ms. |
Use Scenario: Supplying Bluetooth 5.0 SoC (e.g., nRF52840) in wearable earbuds with button-initiated firmware update. IC Role / Device Role / Timing Role: Regulator + reset generator with MR pin wired to tactile switch for user-triggered safe reboot. Use Value: Enables deterministic recovery from corrupted BLE stack without removing battery - MR pulse initiates clean reset sequence. |
| Notebook Subsystems | USB Peripheral Devices |
|
Use Scenario: Powering embedded controller (EC) and keyboard matrix in ultra-thin notebooks with shared Li-ion battery. IC Role / Device Role / Timing Role: Dedicated 1.8V rail with brownout detection that asserts RESET before EC enters undefined state during battery swap. Use Value: Maintains keyboard responsiveness and prevents spurious keypresses during partial power loss - MR pin unused, RESET driven solely by VOUT monitoring. |
Use Scenario: Regulating 1.8V for USB-C PD controller (e.g., CYPD3177) and Type-C port logic in docking stations. IC Role / Device Role / Timing Role: Stable low-noise supply with fast startup (<20µs) and precise reset timing to meet USB PD specification power-state transitions. Use Value: Ensures PD controller initializes correctly after hot-plug events - RESET deassertion aligns with VOUT settling within ±2.0% tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79918YZTT | 1.8V fixed, 200mA, no integrated reset - requires external supervisor (e.g., TPS3808G18) for reset functionality. | Lacks MR input and programmable timeout; suitable only where reset is handled separately. | Select if board space allows discrete supervisor and lower cost outweighs integration benefits. |
| ADM7171ACPZ-1.8-R7 | 1.8V fixed, 800mA, no reset circuit - higher current but zero reset capability; requires external reset IC. | Designed for high-current analog/RF rails, not µP power sequencing - no MR or RESET pins. | Choose only when >300mA load current is required and reset is implemented elsewhere in system architecture. |
Compared with TPS79918YZTT and ADM7171ACPZ-1.8-R7, the MAX6471TA18AD3+ uniquely combines 300mA delivery, integrated -7.5% reset with 150ms timeout, and MR input in one 8-pin TDFN - eliminating two external components and reducing layout complexity for µP-centric designs.
Availability
MAX6471TA18AD3+ is available at Aetrix Electronics and suitable for handheld instruments, wireless modules, notebook subsystems, and USB peripheral devices requiring stable component supply, long-term lifecycle support, and guaranteed reset timing compliance.
Supply support for MAX6471TA18AD3+ 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 and mixed-signal ICs for power management, sensing, and connectivity in demanding environments.
The MAX6469–MAX6484 family was engineered specifically for battery-powered portable equipment needing integrated power regulation and microprocessor supervision - balancing ultra-low quiescent current, tight output accuracy, and robust reset behavior in minimal footprint packages.
FAQ
What is the exact reset threshold voltage for MAX6471TA18AD3+?
The MAX6471TA18AD3+ uses the 'A' suffix, indicating a -7.5% reset threshold relative to its nominal 1.8V output. This corresponds to 1.665V (1.8V × 0.925). RESET asserts when VOUT drops below this value and remains asserted for the full 150ms timeout period after recovery - a behavior confirmed in Maxim's Electrical Characteristics table on page 4 of the datasheet.
Does MAX6471TA18AD3+ support adjustable output voltage?
No, MAX6471TA18AD3+ does not support adjustable output. It belongs to the MAX6471–MAX6474 subgroup, which replaces the SET pin with MR and lacks internal resistor-divider flexibility. Its output is factory-trimmed to fixed 1.8V - verified by Pin Description tables (page 8) and Ordering Information (page 1), where no SET-related suffixes appear in the part number structure.
Can MAX6471TA18AD3+ be used with a 2.4V input supply?
Yes, MAX6471TA18AD3+ operates with input voltages from 2.5V to 5.5V per Absolute Maximum Ratings (page 2). At 2.4V, it falls below the 2.5V minimum operating voltage and will not regulate - the undervoltage lockout (VUVLO = 2.25V to 2.47V) disables regulation before VOUT reaches 1.8V. For 2.4V sources, select a lower-VIN LDO or add boost conversion.
What is the function of the MR pin on MAX6471TA18AD3+?
The MR (Manual Reset) pin on MAX6471TA18AD3+ is an active-low input that forces RESET assertion regardless of VOUT status. When pulled low, it initiates a reset sequence that holds RESET low for the full 150ms timeout after MR returns high - enabling hardware-triggered reboots. Internal 40kΩ pullup to VOUT eliminates need for external resistor, as documented in Pin Descriptions (page 8) and Detailed Description (page 9).
Is MAX6471TA18AD3+ RoHS compliant and lead-free?
Yes, MAX6471TA18AD3+ is RoHS compliant and lead-free. The '+' suffix in the part number explicitly denotes lead-free packaging per Maxim's standard ordering conventions (confirmed in Maxim's Packaging Information documents and Digi-Key/Mouser product listings for this exact part number).
MAX6471TA18AD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V (1.8V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- -
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 136 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Manual Reset, Reset
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN-EP (3x3)
MAX6471TA18AD3+ FAQ
1.How can I place an order for MAX6471TA18AD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6471TA18AD3+ 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 MAX6471TA18AD3+ reliable?
The price and inventory of MAX6471TA18AD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6471TA18AD3+ is usually 5 days.
3.What payment methods are accepted for MAX6471TA18AD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6471TA18AD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6471TA18AD3+?
MAX6471TA18AD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6471TA18AD3+ 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 MAX6471TA18AD3+?
For technical support, including MAX6471TA18AD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6471TA18AD3+ requirements.
6.How does Aetrix verify that MAX6471TA18AD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6471TA18AD3+ 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 MAX6471TA18AD3+ meets industry standards.
7.What is the process for return or replacement of MAX6471TA18AD3+?
All MAX6471TA18AD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6471TA18AD3+, 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 MAX6471TA18AD3+ part is unused and in its original packaging.
Return procedure for MAX6471TA18AD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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