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Analog Devices Inc./Maxim Integrated MAX6471TA28AD3+
- Part No.:
- MAX6471TA28AD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6471TA28AD3+.pdf
- Description:
- IC REG LINEAR LDO WITH MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:1,781
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Product details
Overview
MAX6471TA28AD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.8V output, -7.5% reset threshold, 150ms minimum reset timeout, and active-low manual reset input (MR). It operates from 2.5V to 5.5V input, delivers ±2.0% output accuracy over -40°C to +85°C, and consumes only 82µA quiescent current - ideal for battery-powered handheld instruments and USB peripherals requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6471TA28AD3+ datasheet, MAX6471TA28AD3+ pinout, MAX6471TA28AD3+ application, or MAX6471TA28AD3+ equivalent, key selection considerations include its MR-enabled reset assertion during in-spec operation, 150ms reset timeout timing, TDFN-8 package thermal performance, and compatibility with systems requiring manual system reset without external supervisors.
Technical Context
The MAX6471TA28AD3+ integrates a precision LDO regulator core with a dedicated reset supervisor sharing the same voltage reference. Its manual reset (MR) input allows asynchronous reset assertion while VOUT remains within specification, with internal 40kΩ pullup to VOUT and 1µs minimum pulse width support.
Reset behavior is defined by a -7.5% VOUT threshold (92.5% of nominal), with guaranteed assertion before VOUT drops to 90% and deassertion after recovery plus 150ms timeout. The device uses push-pull RESET output and supports shutdown mode reducing supply current to 0.1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2.0% over -40°C to +85°C - ensures stable core logic supply for 2.8V I/O domains. |
| Max Output Current | 300mA guaranteed - sufficient to power microcontrollers, sensors, and RF transceivers in portable devices. |
| Dropout Voltage | 137mV at 300mA load - enables regulation from 3.0V input down to 2.8V output, critical for single-cell Li-ion or alkaline battery operation. |
| Supply Current | 82µA typical - minimizes standby drain in always-on battery applications like Bluetooth modules. |
| Reset Threshold | -7.5% of VOUT (92.5% = 2.59V) - matches standard microprocessor supply tolerance for reliable boot validation. |
| Reset Timeout | 150ms minimum - provides sufficient hold time for clock stabilization and memory initialization before processor release. |
| Shutdown Current | 0.1µA typical - enables ultra-low-power sleep states in handheld instrumentation and wearables. |
Pinout & Package
MAX6471TA28AD3+ is housed in an 8-pin TDFN package (3mm × 3mm, 0.5mm pitch) with exposed paddle thermally connected to GND. 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 unused (NC); Exposed paddle (EP) must be soldered to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input | Accepts 2.5V–5.5V supply; requires 0.1µF ceramic bypass to GND for stability. |
| 2 (GND) | Ground and thermal pad | Primary return path and heatsink; must connect to large copper area for thermal dissipation. |
| 3 (SHDN) | Active-low shutdown control | Pulling low disables regulator and reduces IQ to 0.1µA; tie to VIN for normal operation. |
| 4 (RESET) | Active-low push-pull reset output | Asserts low during power-up, brownout, or MR activation; holds low for full 150ms timeout after recovery. |
| 5 (MR) | Active-low manual reset input | Asserts RESET while low; internal 40kΩ pullup to VOUT eliminates need for external resistor. |
| 6 (OUT) | Regulated 2.8V output | Delivers up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset (MR) | Enables operator-initiated system reset without violating VOUT regulation - critical for field service and test modes. |
| 150ms reset timeout | Guarantees sufficient delay for oscillator startup and memory initialization before µP execution begins. |
| 82µA quiescent current | Extends battery life in always-on applications such as wireless sensor nodes and medical monitors. |
| Reverse current protection | 0.01µA typical OUT-to-IN leakage prevents backup battery discharge when main supply is removed. |
| Thermal shutdown with hysteresis | Activates at +180°C and re-enables only after 20°C cooldown - prevents thermal runaway during overload. |
Applications
| Handheld Instruments | USB Peripheral Devices |
|---|---|
Use Scenario: Powering PDAs and palmtop computers with single-cell Li-ion batteries and real-time clock backup. IC Role / Device Role / Timing Role: Primary 2.8V LDO regulator with MR-triggered reset for firmware updates and emergency reboot. Use Value: MR input enables hardware reset without interrupting regulated 2.8V supply - avoids data corruption during field firmware reload. |
Use Scenario: Supplying 2.8V logic rails and USB PHY circuitry in portable flash drives and card readers. IC Role / Device Role / Timing Role: Regulator with integrated reset supervision ensuring clean enumeration after host port power cycling. Use Value: 150ms reset timeout aligns with USB 2.0 suspend/resume timing requirements for robust plug-and-play operation. |
| Bluetooth Modules | Digital Cameras |
Use Scenario: Providing stable 2.8V supply to BLE SoCs and RF front-ends in compact wearable designs. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator with MR capability for factory calibration and OTA recovery sequences. Use Value: 82µA quiescent current extends shelf-life battery runtime; MR pin simplifies production test jig interface. |
Use Scenario: Powering image sensor interfaces and ISP cores in battery-operated digital cameras. IC Role / Device Role / Timing Role: Main 2.8V rail generator with brownout detection ensuring safe shutdown before memory write corruption. Use Value: -7.5% reset threshold matches CMOS sensor supply tolerance, preventing corrupted frame capture during voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6472TA28AD3+ | Same package and pinout; differs only in reset threshold (-12.5% vs. -7.5%) and timeout (20ms vs. 150ms). | Suitable for faster-boot systems where shorter reset hold time is acceptable. | Select MAX6472TA28AD3+ only if system clock stabilization completes within 20ms. |
| TPS76328QDBVRQ1 | Automotive-grade 2.8V LDO (300mA) with open-drain RESET but no MR input; 120µA IQ; 200mV dropout at 300mA. | Requires external MR circuitry; rated for AEC-Q100 Grade 3 (-40°C to +125°C). | Choose TPS76328QDBVRQ1 only for automotive environments needing extended temperature range and qualification. |
Compared with MAX6471TA28AD3+, MAX6472TA28AD3+ offers faster reset release but less margin for slow-start clocks, while TPS76328QDBVRQ1 adds automotive reliability at the cost of manual reset functionality and higher dropout.
Availability
MAX6471TA28AD3+ is available at Aetrix Electronics and suitable for handheld instrumentation, USB peripheral design, and Bluetooth module development requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX6471TA28AD3+ 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) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, sensing, and interface applications.
The MAX6469–MAX6484 product line was designed specifically for space-constrained, battery-powered systems requiring integrated power regulation and microprocessor supervision in a single TDFN or UCSP package.
FAQ
What is the reset threshold accuracy of the MAX6471TA28AD3+?
The MAX6471TA28AD3+ features a -7.5% reset threshold, meaning RESET asserts when VOUT falls below 92.5% of its nominal 2.8V output (i.e., below 2.59V). This threshold is guaranteed over -40°C to +85°C and matches standard microprocessor supply tolerance specifications, ensuring reliable boot validation across temperature extremes.
Does the MAX6471TA28AD3+ support adjustable output voltage?
No, the MAX6471TA28AD3+ is a fixed-output device delivering 2.8V. Unlike variants such as MAX6469–MAX6472 that use the SET pin for adjustable operation, the MAX6471TA28AD3+ uses the MR pin instead and has no SET functionality. Its output is factory-trimmed and cannot be modified externally.
How does the manual reset (MR) input function on the MAX6471TA28AD3+?
The MR input on the MAX6471TA28AD3+ is an active-low signal that asserts RESET while pulled low, even if VOUT remains within specification. It includes a 40kΩ internal pullup to VOUT, so leaving MR unconnected defaults it to high. RESET remains asserted for the full 150ms timeout after MR transitions high, enabling clean system restarts without external timing components.
What package type and thermal characteristics apply to the MAX6471TA28AD3+?
The MAX6471TA28AD3+ uses an 8-pin TDFN package (3mm × 3mm, 0.5mm pitch) with exposed paddle. Its thermal resistance θJA is 24.4°C/W, supporting up to 1951mW continuous power dissipation at +70°C ambient. For optimal thermal performance, the exposed paddle must be soldered to a PCB ground plane with ≥4 thermal vias.
Can the MAX6471TA28AD3+ be used with input voltages below 2.5V?
No - the MAX6471TA28AD3+ has a minimum input voltage requirement of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this level risks undervoltage lockout activation (VUVLO = 2.25V to 2.47V) and unstable regulation. For sub-2.5V inputs, consider alternative regulators such as the MAX1725 series.
MAX6471TA28AD3+ 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 (2.8V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.21V @ 300mA
- 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)
MAX6471TA28AD3+ FAQ
1.How can I place an order for MAX6471TA28AD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6471TA28AD3+ 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 MAX6471TA28AD3+ reliable?
The price and inventory of MAX6471TA28AD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6471TA28AD3+ is usually 5 days.
3.What payment methods are accepted for MAX6471TA28AD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6471TA28AD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6471TA28AD3+?
MAX6471TA28AD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6471TA28AD3+ 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 MAX6471TA28AD3+?
For technical support, including MAX6471TA28AD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6471TA28AD3+ requirements.
6.How does Aetrix verify that MAX6471TA28AD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6471TA28AD3+ 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 MAX6471TA28AD3+ meets industry standards.
7.What is the process for return or replacement of MAX6471TA28AD3+?
All MAX6471TA28AD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6471TA28AD3+, 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 MAX6471TA28AD3+ part is unused and in its original packaging.
Return procedure for MAX6471TA28AD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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