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Analog Devices Inc./Maxim Integrated MAX6471TA28BD3+T
- Part No.:
- MAX6471TA28BD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6471TA28BD3+T.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6471TA28BD3+T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.8V output, -12.5% reset threshold, and 150ms minimum reset timeout. It features 82µA quiescent current, 137mV dropout at 300mA load, and active-low manual reset (MR) input. Designed for battery-powered portable equipment including Bluetooth modules and digital cameras.
For engineers reviewing the MAX6471TA28BD3+T datasheet, MAX6471TA28BD3+T pinout, MAX6471TA28BD3+T application, or MAX6471TA28BD3+T equivalent, key selection criteria include its 2.8V fixed output, MR-enabled system-level reset control, 150ms reset timeout, and 8-pin TDFN-EP package with exposed thermal pad - all critical for space-constrained, low-power embedded designs.
Technical Context
The MAX6471TA28BD3+T integrates a precision LDO regulator core with a dedicated reset supervisor sharing the same reference voltage. Its MR input provides asynchronous reset assertion while VOUT remains within specification, enabling operator-initiated or test-system-triggered resets without power cycle.
This variant belongs to the MAX6471–MAX6474/MAX6479–MAX6482 subgroup, confirming presence of MR pin (Pin 3), push-pull or open-drain RESET (Pin 4), SET-adjustable capability (Pin 5), and absence of FB or SHDN pins - distinguishing it from MAX6469/MAX6470 (SHDN) and MAX6475/MAX6476 (FB) variants.
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 interfaces. |
| Max Output Current | 300mA guaranteed - sufficient to power microcontrollers, RF transceivers, and sensor subsystems. |
| Dropout Voltage | 137mV at 300mA load - enables operation down to VIN = 2.937V, extending battery runtime in single-cell Li-ion systems. |
| Quiescent Current | 82µA typical - minimizes standby drain in always-on portable devices. |
| Reset Threshold | -12.5% of VOUT (2.45V typ) - meets stringent microprocessor supply tolerance requirements for reliable boot sequencing. |
| Reset Timeout | 150ms minimum - provides adequate stabilization window for clock oscillators and memory before processor release. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V), 3-cell alkaline (3.0–4.5V), and USB-powered systems. |
Pinout & Package
MAX6471TA28BD3+T uses an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad (EP) internally connected to GND. The EP must be soldered to PCB ground plane for thermal management and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator Input | Accepts 2.5V–5.5V input; requires 0.1µF bypass capacitor to GND for stability. |
| 2 (GND) | Ground / Thermal Pad Anchor | Primary return path and heatsink; must connect to large copper area for thermal dissipation. |
| 3 (MR) | Active-Low Manual Reset Input | Pulls RESET low when asserted; internal 40kΩ pullup to VOUT eliminates external resistor need. |
| 4 (RESET) | Active-Low Reset Output | Push-pull configuration asserts low during power-up, brownout, or MR activation; holds for full 150ms timeout. |
| 5 (SET) | Feedback Reference Input | Connected to GND for fixed 2.8V output; supports adjustable mode via external resistor divider if reconfigured. |
| 6 (OUT) | Regulated Output | Delivers 2.8V/300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response and stability. |
| EP | Exposed Thermal Pad | Internally tied to GND; mandatory connection to PCB ground plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Manual Reset (MR) | Enables hardware-triggered system reset without power interruption - critical for field diagnostics and firmware recovery. |
| 150ms Reset Timeout | Guarantees sufficient time for oscillator startup and memory initialization before processor execution begins. |
| 2.8V Fixed Output Accuracy | ±2.0% over full temperature range ensures compliance with 2.8V I/O standards (e.g., SDIO, camera sensors, BLE radios). |
| Low Dropout at Full Load | 137mV at 300mA allows operation with minimal headroom - extends usable battery voltage range by ~137mV. |
| Reverse Current Protection | 0.01µA max OUT-to-IN leakage prevents backup capacitor or battery discharge when main supply is removed. |
Applications
| Bluetooth Module Power Management | Digital Camera Core Supply |
|---|---|
|
Use Scenario: Powers baseband processor and RF transceiver in compact Bluetooth audio accessories with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Provides regulated 2.8V supply and asserts RESET during battery insertion/removal or low-VIN brownout. Use Value: Ensures clean power-up sequence and prevents corrupted BLE link establishment due to premature processor wake-up. |
Use Scenario: Supplies image sensor and ISP core in ultra-thin digital cameras where board space limits discrete supervision components. IC Role / Device Role / Timing Role: Delivers stable 2.8V rail while monitoring VOUT and responding to MR button press for forced camera reset. Use Value: Eliminates need for separate reset IC and saves >2mm² PCB area versus discrete LDO + supervisor solution. |
| USB-C Powered Peripheral | Industrial Handheld Scanner |
|
Use Scenario: Regulates 5V USB-C input to 2.8V for MCU and touch controller in portable barcode scanner dongle. IC Role / Device Role / Timing Role: Acts as primary power converter with integrated reset supervision; MR pin used for factory test mode entry. Use Value: Reduces BOM count by merging regulation and reset functions - lowers assembly cost and improves supply chain resilience. |
Use Scenario: Powers ARM Cortex-M4-based controller and laser driver in ruggedized handheld scanners operating across -20°C to +70°C ambient. IC Role / Device Role / Timing Role: Maintains 2.8V supply under dynamic load steps while asserting RESET during cold-start battery voltage ramp. Use Value: Guarantees deterministic boot behavior even with aged alkaline batteries exhibiting slow voltage rise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6471TA30BD3+T | 3.0V fixed output instead of 2.8V; identical pinout, MR functionality, and 150ms reset timeout. | Suitable for systems requiring 3.0V logic rails (e.g., certain SD cards, older MCU families). | Select only if target application mandates 3.0V - not a drop-in replacement for 2.8V-dependent circuits. |
| TPS76328QDBVRQ1 | 2.8V LDO with 100mA output and no integrated reset or MR pin; requires external supervisor IC. | Applicable where lower current suffices and board space allows discrete supervision. | Choose when cost sensitivity outweighs integration benefits and system reset timing is less critical. |
Compared with MAX6471TA28BD3+T, the 3.0V variant offers voltage flexibility within the same family, while the TPS76328QDBVRQ1 trades integration for lower unit cost - making MAX6471TA28BD3+T optimal for space-constrained, high-reliability 2.8V portable systems requiring hardware reset control.
Availability
MAX6471TA28BD3+T is available at Aetrix Electronics and suitable for Bluetooth modules, digital cameras, USB peripherals, and industrial handheld scanners requiring stable component supply with long-term lifecycle support.
Supply support for MAX6471TA28BD3+T 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 MAX6469–MAX6484 product line delivers highly integrated, low-quiescent-current LDO regulators with embedded reset supervision - engineered specifically for battery-powered portable electronics where size, efficiency, and reliability are paramount.
FAQ
What is the output voltage tolerance of the MAX6471TA28BD3+T over temperature?
The MAX6471TA28BD3+T guarantees ±2.0% output voltage accuracy over the full -40°C to +85°C operating temperature range. This specification applies to fixed-output operation with SET tied to GND and ensures stable 2.8V regulation for sensitive 2.8V I/O interfaces across environmental extremes. The MAX6471TA28BD3+T achieves this using a trimmed bandgap reference and precision internal feedback resistors.
Does the MAX6471TA28BD3+T support adjustable output voltage?
Yes, the MAX6471TA28BD3+T supports adjustable output voltage via its SET pin. When SET is disconnected from GND and connected to an external resistor divider between OUT and GND, the output can be set from 1.25V to 5.5V using the formula VOUT = 1.229V × (1 + R1/R2). The MAX6471TA28BD3+T retains its 2.8V preset configuration only when SET is grounded - reconfiguration requires layout changes.
What is the function of the MR pin on the MAX6471TA28BD3+T?
The MR (Manual Reset) pin on the MAX6471TA28BD3+T is an active-low input that forces the RESET output low regardless of VOUT status - enabling hardware-initiated system reset while power remains valid. It features a 40kΩ internal pullup to VOUT, allowing direct connection to a momentary switch without external components. The MAX6471TA28BD3+T holds RESET active for the full 150ms timeout after MR release.
What package type and thermal characteristics does the MAX6471TA28BD3+T use?
The MAX6471TA28BD3+T uses an 8-pin TDFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad (EP) internally connected to GND. Its thermal resistance θJA is 24.4°C/W, enabling 1951mW maximum power dissipation at +70°C ambient. The EP must be soldered to a PCB ground plane to achieve rated thermal performance and ensure reliable operation under 300mA load.
How does the MAX6471TA28BD3+T handle reverse current flow from OUT to IN?
The MAX6471TA28BD3+T incorporates reverse current protection that limits OUT-to-IN leakage to 0.01µA typical when VOUT > VIN. This prevents backup capacitors or secondary batteries from discharging into the main power source. During such conditions, RESET remains asserted until VIN exceeds VOUT and VOUT rises above the 2.45V reset threshold - ensuring system remains in safe reset state during power transitions.
MAX6471TA28BD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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):
- 96 µA
- PSRR:
- -
- Control Features:
- 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+T FAQ
1.How can I place an order for MAX6471TA28BD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6471TA28BD3+T 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+T reliable?
The price and inventory of MAX6471TA28BD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6471TA28BD3+T is usually 5 days.
3.What payment methods are accepted for MAX6471TA28BD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6471TA28BD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6471TA28BD3+T?
MAX6471TA28BD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6471TA28BD3+T 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+T?
For technical support, including MAX6471TA28BD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6471TA28BD3+T requirements.
6.How does Aetrix verify that MAX6471TA28BD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6471TA28BD3+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX6471TA28BD3+T?
All MAX6471TA28BD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6471TA28BD3+T, 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+T part is unused and in its original packaging.
Return procedure for MAX6471TA28BD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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