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Analog Devices Inc./Maxim Integrated MAX6471TA28BD3+
- Part No.:
- MAX6471TA28BD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6471TA28BD3+.pdf
- Description:
- IC REG LINEAR LDO 300MA
- Quantity:
- Payment:
- Shipping:
Inventory:2,635
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Product details
Overview
MAX6471TA28BD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.8V output, -7.5% reset threshold, and 150ms minimum reset timeout. It delivers ±2.0% output accuracy over -40°C to +85°C, consumes only 82µA quiescent current, and features active-low manual reset (MR) input-ideal for battery-powered portable systems requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6471TA28BD3+ datasheet, MAX6471TA28BD3+ pinout, MAX6471TA28BD3+ application, or MAX6471TA28BD3+ equivalent, key selection criteria include its 2.8V fixed output, MR-enabled system-level reset control, 150ms reset timeout, shutdown capability (0.1µA), and compatibility with compact 8-pin TDFN-EP packaging for space-constrained embedded designs.
Technical Context
The MAX6471TA28BD3+ integrates a precision LDO regulator core with a dedicated reset supervisor sharing the same reference voltage. Its regulator operates from 2.5V to 5.5V input, maintains 2.8V output with ±2.0% accuracy across temperature, and achieves 137mV dropout at 300mA load (VOUT = 2.8V). The reset circuit monitors VOUT directly and asserts active-low RESET when output falls below 92.5% of nominal (–7.5% threshold).
It includes an active-low manual reset input (MR) with internal 40kΩ pullup to VOUT, enabling external reset initiation while VOUT remains in specification. RESET remains asserted during MR low condition and persists for the full 150ms timeout after MR release-ensuring deterministic processor initialization without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2.0% over –40°C to +85°C - ensures stable supply for 2.8V logic and RF subsystems without external feedback resistors. |
| Max Output Current | 300mA guaranteed - sufficient to power microcontrollers, sensors, and wireless transceivers in portable devices. |
| Dropout Voltage | 137mV at 300mA (VOUT = 2.8V) - enables operation down to VIN = 2.937V, extending battery runtime in single-cell Li-ion or 3× alkaline applications. |
| Quiescent Current | 82µA typical - minimizes standby power loss in always-on monitoring circuits and IoT edge nodes. |
| Reset Threshold | –7.5% of 2.8V (2.59V min) - triggers RESET before microprocessor supply tolerance violation, preventing erratic execution. |
| Reset Timeout | 150ms minimum - provides adequate time for clock stabilization and memory initialization before processor release. |
| Shutdown Current | 0.1µA typical - enables ultra-low-power deep-sleep modes in handheld instruments and wearables. |
Pinout & Package
MAX6471TA28BD3+ is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) package with exposed paddle thermally connected to GND. Pin 1 is IN; Pin 2 is GND; Pin 3 is MR; Pin 4 is RESET; Pin 5 is SET; Pin 6 is OUT; Pins 7–8 are NC (no connect); 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 bypass capacitor to GND for stability. |
| 2 (GND) | Ground & thermal pad | Primary return path and heatsink; must connect to large copper area for thermal dissipation. |
| 3 (MR) | Active-low manual reset input | Pulled high internally to VOUT (40kΩ); assert low to force RESET regardless of VOUT status. |
| 4 (RESET) | Active-low reset output | Push-pull configuration; drives low during power-up, brownout, or MR assertion for ≥150ms. |
| 5 (SET) | Feedback reference input | Connected to GND for fixed 2.8V mode; left unconnected or tied to GND per design-no external divider needed. |
| 6 (OUT) | Regulated output | Delivers 2.8V/300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated microprocessor reset supervisor | Eliminates need for discrete supervisor IC-reduces BOM count and board area in space-limited portable designs. |
| Manual reset (MR) input with internal pullup | Enables hardware-initiated reset via pushbutton or system controller without external biasing components. |
| 150ms reset timeout with guaranteed minimum | Ensures reliable processor boot sequence timing without external RC networks or firmware delays. |
| Low 82µA quiescent current | Extends battery life in always-on sensor nodes and remote telemetry devices operating on coin cells or small Li-ion packs. |
| Thermal and short-circuit protection | Prevents damage during overload or poor PCB thermal layout-supports robust field deployment without derating. |
Applications
| Handheld Instruments | PCMCIA / USB Devices |
|---|---|
Use Scenario: Power management in portable multimeters and data loggers with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Provides regulated 2.8V supply to MCU and analog front-end while asserting RESET during battery insertion/removal. Use Value: Ensures deterministic startup and prevents corrupted measurements due to undervoltage operation. |
Use Scenario: Compact add-in cards requiring self-contained power supervision and hot-plug resilience. IC Role / Device Role / Timing Role: Delivers clean 2.8V rail and generates synchronized RESET pulse upon USB VBUS application or card insertion. Use Value: Meets USB compliance requirements for controlled power-up sequencing without host-side intervention. |
| Cellular Telephones | Digital Cameras |
Use Scenario: Baseband processor power domain in feature phones with replaceable batteries. IC Role / Device Role / Timing Role: Supplies 2.8V to modem IC and asserts RESET during battery swap or low-VIN brownout events. Use Value: Maintains call continuity during brief power interruptions and prevents modem lockup during battery replacement. |
Use Scenario: Image sensor and ISP power rail in compact digital still cameras with flash LED support. IC Role / Device Role / Timing Role: Regulates 2.8V for sensor interface and triggers RESET when flash discharge causes VOUT sag. Use Value: Prevents image corruption by halting frame capture until supply stabilizes post-flash discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6472TA28BD3+ | Same 2.8V output and 150ms timeout, but uses open-drain RESET instead of push-pull. | Requires external pullup resistor for RESET signal; less suitable for direct µP reset pin drive without level-shifting. | Select when interfacing with legacy processors requiring open-drain reset signaling or shared-bus reset arbitration. |
| TPS76328QDBVRQ1 | 2.8V LDO with 100mA output and no integrated reset; requires external supervisor (e.g., TPS3809K33) for reset functionality. | Higher component count and larger footprint; lacks MR input and fixed 150ms timeout. | Choose only if automotive AEC-Q100 qualification is mandatory and system allows separate reset IC integration. |
Compared with MAX6471TA28BD3+, MAX6472TA28BD3+ offers identical regulation and timing but different RESET drive architecture, while TPS76328QDBVRQ1 trades integration for automotive qualification-neither provides the combined MR input, push-pull RESET, and compact TDFN packaging of the original.
Availability
MAX6471TA28BD3+ is available at Aetrix Electronics and suitable for handheld instruments, PCMCIA/USB peripherals, and cellular telephone designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6471TA28BD3+ 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 communication applications.
The MAX6469–MAX6484 family was engineered specifically for battery-powered portable electronics needing tightly regulated voltage, ultra-low quiescent current, and integrated power-supply monitoring with configurable reset behavior.
FAQ
What is the output voltage tolerance of the MAX6471TA28BD3+ over temperature?
The MAX6471TA28BD3+ guarantees ±2.0% output voltage accuracy across the full –40°C to +85°C operating range. This specification applies to the fixed 2.8V output under 1mA–300mA load conditions and ensures reliable operation of downstream 2.8V logic, RF modules, and analog sensors without additional calibration.
Does the MAX6471TA28BD3+ require external components for basic operation?
Yes, the MAX6471TA28BD3+ requires two external capacitors: a 0.1µF ceramic capacitor from IN to GND and a minimum 3.3µF low-ESR ceramic capacitor from OUT to GND. No external resistors or timing components are needed-the 2.8V output, –7.5% reset threshold, and 150ms timeout are factory-configured and fully integrated within the MAX6471TA28BD3+.
How does the manual reset (MR) input function on the MAX6471TA28BD3+?
The MR input on the MAX6471TA28BD3+ is an active-low signal with an internal 40kΩ pullup to VOUT. When pulled low (≤0.3×VOUT), it immediately asserts the active-low RESET output-even if VOUT is within specification. RESET remains asserted for the full 150ms timeout after MR returns high, ensuring consistent processor reset timing independent of supply conditions.
What is the dropout voltage of the MAX6471TA28BD3+ at full 300mA load?
At 300mA load and 2.8V output, the MAX6471TA28BD3+ exhibits a maximum dropout voltage of 210mV (typical 137mV), defined as VIN – VOUT when VOUT drops 2% below nominal. This allows operation with input as low as 3.01V, supporting extended runtime in single-cell Li-ion (2.8V–4.2V) and triple-alkaline (2.8V–4.5V) battery systems.
Is the MAX6471TA28BD3+ RoHS-compliant and lead-free?
Yes, the MAX6471TA28BD3+ is supplied in a lead(Pb)-free and RoHS-compliant 8-pin TDFN-EP package. The "+" suffix in the part number explicitly denotes compliance with EU RoHS Directive 2011/65/EU and JEDEC JS-001 standards, with peak reflow temperature rated at +260°C for lead-free soldering processes.
MAX6471TA28BD3+ 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):
- 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 (3x3)
MAX6471TA28BD3+ FAQ
1.How can I place an order for MAX6471TA28BD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6471TA28BD3+ 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 MAX6471TA28BD3+ reliable?
The price and inventory of MAX6471TA28BD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6471TA28BD3+ is usually 5 days.
3.What payment methods are accepted for MAX6471TA28BD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6471TA28BD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6471TA28BD3+?
MAX6471TA28BD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6471TA28BD3+ 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 MAX6471TA28BD3+?
For technical support, including MAX6471TA28BD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6471TA28BD3+ requirements.
6.How does Aetrix verify that MAX6471TA28BD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6471TA28BD3+ 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 MAX6471TA28BD3+ meets industry standards.
7.What is the process for return or replacement of MAX6471TA28BD3+?
All MAX6471TA28BD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6471TA28BD3+, 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 MAX6471TA28BD3+ part is unused and in its original packaging.
Return procedure for MAX6471TA28BD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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