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Analog Devices Inc./Maxim Integrated MAX6476TA28AD3+T
- Part No.:
- MAX6476TA28AD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6476TA28AD3+T.pdf
- Description:
- IC REG LDO 2.8V/ADJ 0.3A 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,062
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Product details
Overview
The MAX6476TA28AD3+T 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 open-drain RESET output. It features 82µA quiescent current, 114mV dropout at 300mA, and operates from -40°C to +85°C in an 8-pin TDFN-EP package. Designed for battery-powered portable equipment requiring stable voltage and reliable power-on reset.
For engineers reviewing the MAX6476TA28AD3+T datasheet, MAX6476TA28AD3+T pinout, MAX6476TA28AD3+T application, or MAX6476TA28AD3+T equivalent, this device delivers verified 2.8V regulation, factory-trimmed ±2.0% output accuracy over temperature, integrated reset supervision with manual reset compatibility, and remote feedback capability via FB pin for external NPN transistor boosting.
Technical Context
The MAX6476TA28AD3+T implements a dual-function LDO core with internal bandgap reference shared between regulation and reset monitoring. Its reset circuit asserts when VFB falls below 92.5% of nominal output (i.e., 2.59V for 2.8V output), with guaranteed 35µs response delay and 150ms minimum timeout. The FB pin enables remote sensing or external pass transistor control, decoupling feedback from the OUT pin.
This variant belongs to the MAX6475/MAX6476/MAX6483/MAX6484 subgroup, which replaces SET with FB for precision remote sensing or high-current extension. It includes shutdown control (SHDN), reverse current protection (<0.01µA OUT→IN leakage), thermal shutdown at +180°C, and 450mA current limiting - all operating within 2.5V–5.5V input range.
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. |
| Dropout Voltage | 114mV at 300mA load - enables operation down to 2.914V input, critical for single-cell Li-ion or alkaline battery systems. |
| Supply Current | 82µA typical (no load) - extends battery life in always-on portable instrumentation and wireless modules. |
| Reset Threshold | -7.5% of VOUT (2.59V min) - meets standard microprocessor supply tolerance requirements without external supervisor. |
| Reset Timeout | 150ms minimum - provides sufficient stabilization time for clock oscillators and memory initialization before processor release. |
| Shutdown Current | 0.1µA typical - reduces system standby power to nanoampere level during deep sleep modes. |
| Input Voltage Range | 2.5V to 5.5V - supports direct connection to USB, Li-ion, or multi-cell alkaline sources without pre-regulation. |
Pinout & Package
MAX6476TA28AD3+T is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) package with exposed paddle thermally and electrically connected to GND. The EP pad must be soldered to a PCB ground plane for optimal thermal performance and EMI suppression.
| 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 and noise rejection. |
| 2 (GND) | Ground / Thermal Pad | Primary return path and heatsink; must connect to large copper area or internal ground plane for thermal dissipation. |
| 3 (SHDN) | Active-Low Shutdown Control | Pull low to disable regulator and reduce supply current to 0.1µA; tie to IN for normal operation. |
| 4 (RESET) | Active-Low Open-Drain Reset Output | Asserts low during power-up, brownout, or SHDN activation; requires external pullup for µP reset interface. |
| 5 (FB) | Remote Feedback Sense Input | Connects directly to load VCC point for accurate remote voltage regulation or drives external NPN transistor base. |
| 6 (OUT) | Regulator Output | Delivers up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient stability. |
| 7–8 (EP) | Exposed Paddle | Internally tied to GND; mandatory solder connection to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Remote Feedback (FB) Pin | Enables precise regulation at load point or integration with external NPN pass transistor for >300mA total current. |
| Factory-Trimmed Reset Threshold | Guaranteed -7.5% tolerance (92.5% of VOUT) - eliminates need for external resistor divider or calibration. |
| Low Dropout & Ultra-Low IQ | 114mV dropout at full 300mA + 82µA quiescent current - maximizes usable battery voltage range and runtime. |
| Reverse Current Protection | <0.01µA OUT-to-IN leakage - prevents backup capacitor or battery from back-feeding into depleted main supply. |
| Thermal & Short-Circuit Protection | +180°C shutdown with 20°C hysteresis + 450mA current limit - ensures robustness under fault conditions without external components. |
Applications
| Handheld Medical Instruments | USB-Powered IoT Sensors |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single AAA/AA alkaline cells. IC Role / Device Role / Timing Role: Primary 2.8V power rail generator and system reset supervisor during battery insertion and wake-up cycles. Use Value: 114mV dropout allows operation down to 2.914V input, extending usable battery life by >15% versus higher-dropout alternatives. |
Use Scenario: Low-power environmental sensor nodes drawing <100µA in sleep mode and bursting to 50mA for Wi-Fi transmission. IC Role / Device Role / Timing Role: Stable 2.8V supply for MCU and RF transceiver, with synchronized 150ms reset assertion ensuring clean boot after USB hot-plug. Use Value: 0.1µA shutdown current enables multi-year battery life; open-drain RESET interfaces directly with common 3.3V logic-level µP reset inputs. |
| Bluetooth Audio Accessories | Industrial Handheld Scanners |
Use Scenario: Wireless earbuds and Bluetooth headsets using rechargeable Li-ion cells with tight voltage envelopes. IC Role / Device Role / Timing Role: Regulates 2.8V for DSP and codec, while FB pin senses voltage at headphone amplifier to compensate for PCB trace IR drop. Use Value: Remote sensing via FB maintains ±2.0% output accuracy at load point, eliminating audible distortion from supply sag. |
Use Scenario: Rugged barcode scanners operating in warehouses with wide ambient temperature swings (-20°C to +60°C). IC Role / Device Role / Timing Role: Supplies 2.8V to image sensor and laser driver; thermal shutdown protects against sustained high-current bursts during continuous scanning. Use Value: Guaranteed -40°C to +85°C operation and ±2.0% accuracy ensure consistent performance across industrial environments without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6476TA28AD2+T | Same 2.8V output and FB pin, but 20ms reset timeout instead of 150ms. | Suitable for fast-boot systems where shorter reset hold time is acceptable. | Select when faster system initialization is required and oscillator stabilization time is ≤20ms. |
| TPS76328QDBVRQ1 | 2.8V fixed LDO only (no integrated reset); 110mV dropout at 150mA; AEC-Q100 qualified. | Requires external reset IC (e.g., TPS3809) for automotive-grade supervision. | Choose for automotive applications needing AEC-Q100 qualification, accepting added BOM cost and layout complexity. |
Compared with MAX6476TA28AD2+T, the MAX6476TA28AD3+T provides longer reset assertion for slower clock sources; compared with TPS76328QDBVRQ1, it integrates reset functionality but lacks automotive qualification - making it optimal for industrial and portable consumer designs requiring compact, self-contained power management.
Availability
MAX6476TA28AD3+T is available at Aetrix Electronics and suitable for handheld medical instruments, USB-powered IoT sensors, Bluetooth audio accessories, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6476TA28AD3+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 and mixed-signal ICs for power management, sensing, and connectivity in demanding environments.
The MAX6469–MAX6484 product line targets battery-powered portable electronics requiring ultra-low quiescent current, integrated reset supervision, and flexible output configuration - delivering single-chip power and reset solutions for space-constrained designs.
FAQ
What is the exact output voltage tolerance of the MAX6476TA28AD3+T over temperature?
The MAX6476TA28AD3+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 FB connected to the load VCC node, and is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy (Fixed Output Voltage Operation)" for MAX6475–MAX6476 devices.
Does the MAX6476TA28AD3+T support remote voltage sensing, and how is it implemented?
Yes, the MAX6476TA28AD3+T supports remote voltage sensing via its dedicated FB pin. Unlike SET-based variants, FB is not internally connected to OUT - it must be connected directly to the load's VCC point (e.g., MCU power rail) to compensate for PCB trace resistance. This ensures regulation accuracy is maintained at the point of load, not at the IC output.
What is the function of the exposed paddle (EP) on the MAX6476TA28AD3+T TDFN package?
The exposed paddle (EP) on the MAX6476TA28AD3+T is internally connected to GND and serves as both a thermal conduction path and a low-inductance ground connection. It must be soldered to a PCB ground plane using adequate thermal vias to maintain junction temperature below +150°C under 300mA load and ensure EMI performance - not doing so risks thermal shutdown or instability.
Can the MAX6476TA28AD3+T drive an external NPN transistor for higher output current?
Yes, the MAX6476TA28AD3+T is explicitly designed for external NPN transistor use via its FB pin. When configured per Figure 2 in the datasheet, the FB pin drives the base of an external NPN pass transistor, enabling total output current up to (300mA × βmin). The device's internal current limit and thermal protection remain active for the entire system.
What reset timeout period is implemented in the MAX6476TA28AD3+T, and how is it selected?
The MAX6476TA28AD3+T implements a 150ms minimum reset timeout period, indicated by the "D3" suffix in its part number. This value is factory-programmed and non-adjustable; it defines the minimum duration RESET remains asserted after VFB rises above the -7.5% threshold, ensuring sufficient time for oscillator stabilization and memory initialization before processor release.
MAX6476TA28AD3+T 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):
- 96 µA
- PSRR:
- -
- Control Features:
- Reset, Shutdown
- 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)
MAX6476TA28AD3+T FAQ
1.How can I place an order for MAX6476TA28AD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6476TA28AD3+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 MAX6476TA28AD3+T reliable?
The price and inventory of MAX6476TA28AD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6476TA28AD3+T is usually 5 days.
3.What payment methods are accepted for MAX6476TA28AD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6476TA28AD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6476TA28AD3+T?
MAX6476TA28AD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6476TA28AD3+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 MAX6476TA28AD3+T?
For technical support, including MAX6476TA28AD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6476TA28AD3+T requirements.
6.How does Aetrix verify that MAX6476TA28AD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6476TA28AD3+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 MAX6476TA28AD3+T meets industry standards.
7.What is the process for return or replacement of MAX6476TA28AD3+T?
All MAX6476TA28AD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6476TA28AD3+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 MAX6476TA28AD3+T part is unused and in its original packaging.
Return procedure for MAX6476TA28AD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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