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Analog Devices Inc./Maxim Integrated MAX6476TA30BD3+T
- Part No.:
- MAX6476TA30BD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6476TA30BD3+T.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
MAX6476TA30BD3+T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 3.0V output, -12.5% reset threshold accuracy, 150ms minimum reset timeout, active-low push-pull RESET, and shutdown control. It operates from 2.5V to 5.5V input, delivers ±2.7% output voltage accuracy over -40°C to +85°C, and consumes only 82µA quiescent current - ideal for battery-powered portable electronics requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6476TA30BD3+T datasheet, MAX6476TA30BD3+T pinout, MAX6476TA30BD3+T application, or MAX6476TA30BD3+T equivalent, this device serves as a single-chip solution for regulated 3.0V supply generation and deterministic microprocessor reset assertion during power-up, dropout, or manual intervention - with confirmed support for handheld instruments, Bluetooth modules, and USB devices.
Technical Context
The MAX6476TA30BD3+T integrates a precision LDO regulator core and a fully self-contained reset supervisor sharing the same bandgap reference. Its reset circuit monitors the regulated output (via FB pin) against a -12.5% threshold and asserts an active-low push-pull RESET signal for ≥150ms after recovery, eliminating external supervision components.
This variant belongs to the MAX6475/MAX6476/MAX6483/MAX6484 subgroup featuring remote feedback (FB) for external NPN pass transistor augmentation and SHDN-controlled shutdown reducing supply current to 0.1µA. It uses the 8-pin TDFN-EP package with exposed paddle for thermal management and supports reverse current protection (0.01µA OUT→IN leakage).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±2.7% over -40°C to +85°C - ensures stable core logic supply for 3.3V-tolerant microcontrollers without external resistors. |
| Max Output Current | 300mA guaranteed - sufficient to power ARM Cortex-M0+ MCUs, RF transceivers, or sensor hubs directly. |
| Dropout Voltage | 114mV at 300mA load - enables operation from single-cell Li-ion (3.0V min) while maintaining regulation. |
| Reset Threshold | -12.5% of VOUT (2.625V) - provides tighter supply monitoring than -7.5% variants, suitable for noise-sensitive applications. |
| Reset Timeout | 150ms minimum - meets boot-time requirements for embedded Linux systems and complex peripherals. |
| Quiescent Current | 82µA typical - extends battery life in always-on IoT sensors and wearable devices. |
| Shutdown Current | 0.1µA typical - enables ultra-low-power sleep states without disconnecting the battery. |
Pinout & Package
MAX6476TA30BD3+T is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad (internally connected to GND). The EP must be soldered to PCB ground plane for thermal integrity and EMI reduction.
| 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 SHDN | Active-Low Shutdown Control | Pulling low disables regulator and reduces supply current to 0.1µA; tie to VIN for normal operation. |
| 4 RESET | Active-Low Push-Pull Reset Output | Drives µP reset pin directly; asserts low during power-up, brownout, or SHDN activation for ≥150ms. |
| 5 FB | Remote Feedback Sense Input | Connects to load VCC point to compensate for PCB trace IR drop; enables external NPN transistor for >300mA loads. |
| 6 OUT | Regulated Output | Delivers 3.0V @ up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND. |
| 7,8 EP | Exposed Thermal Pad | Internally tied to GND; mandatory connection to PCB ground plane for thermal performance and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Microprocessor Reset | Eliminates need for discrete supervisor IC by providing factory-trimmed -12.5% threshold and 150ms timeout with push-pull drive. |
| Remote Feedback (FB) Pin | Enables precise load-point regulation and supports external NPN pass transistor for high-current applications (e.g., 1A total with β=3). |
| Low Quiescent Current | 82µA operating / 0.1µA shutdown - extends shelf life and runtime in coin-cell or energy-harvesting systems. |
| Reverse Current Protection | 0.01µA typical OUT→IN leakage prevents battery backfeed when input is disconnected or dead. |
| Thermal & Short-Circuit Protection | Auto-shutdown at 180°C junction temperature with 20°C hysteresis; 450mA current limit protects against sustained overload. |
Applications
| Handheld Instruments | Bluetooth Modules |
|---|---|
Use Scenario: Powering ARM-based data loggers with real-time clock and SD card interface in field-deployable PDAs. IC Role / Device Role / Timing Role: Provides clean, sequenced 3.0V supply and asserts RESET until VOUT stabilizes above 2.625V post-battery insertion. Use Value: Guarantees deterministic µP boot without external RC timing networks or supervisors - reducing BOM count by one IC. |
Use Scenario: Supplying baseband processor and BLE radio in compact wireless earbuds with tight thermal constraints. IC Role / Device Role / Timing Role: Delivers regulated 3.0V under dynamic load (10mA–300mA), while RESET ensures firmware starts only after full voltage rail establishment. Use Value: 114mV dropout at 300mA allows direct use of partially discharged Li-ion cells, extending usable battery capacity by ~8%. |
| USB Peripheral Devices | Notebook Subsystems |
Use Scenario: Powering USB-C audio adapters with integrated DAC and USB PHY, drawing peak current during enumeration. IC Role / Device Role / Timing Role: Regulates 3.0V from 5V USB bus via internal LDO; FB pin compensates for trace resistance between OUT and DAC VDD pins. Use Value: Remote sensing maintains ±1% load regulation across 150mV IR drop - critical for low-noise analog performance. |
Use Scenario: Supplying always-on EC (Embedded Controller) and keyboard controller in ultrabook lid-open detection circuits. IC Role / Device Role / Timing Role: Operates in shutdown mode (0.1µA) when system is off; SHDN release triggers regulated 3.0V and synchronized RESET pulse. Use Value: Enables instant wake-from-suspend with guaranteed power-good signaling - meeting Intel Platform Environment Control Interface (PECI) timing specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6476TA30BD2+T | Same 3.0V output and FB pin, but 20ms reset timeout instead of 150ms. | Suitable for fast-boot microcontrollers (e.g., RISC-V cores) where long reset hold times cause boot delays. | Select when system boot sequence requires shorter reset assertion - no PCB changes needed if footprint and pinout match. |
| TPS79930YZUR | 300mA LDO with 3.0V fixed output and 82µA IQ, but no integrated reset circuit or FB pin. | Requires external supervisor (e.g., TPS3808G18) for reset functionality, increasing component count and board area. | Choose only if reset functionality is implemented separately and thermal performance in 2mm × 2mm DSBGA is prioritized over integration. |
Compared with MAX6476TA30BD2+T, the MAX6476TA30BD3+T provides longer reset hold time for robust initialization of complex peripherals; compared with TPS79930YZUR, it eliminates external reset ICs and enables remote sensing - reducing design complexity and improving load regulation accuracy by 0.8%.
Availability
MAX6476TA30BD3+T is available at Aetrix Electronics and suitable for handheld instruments, Bluetooth modules, and USB peripheral devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6476TA30BD3+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 was engineered specifically for space-constrained, battery-powered systems needing combined regulation and intelligent reset supervision - targeting portable medical, industrial telemetry, and consumer wireless applications.
FAQ
What is the function of the FB pin on the MAX6476TA30BD3+T?
The FB (Feedback) pin on the MAX6476TA30BD3+T enables remote voltage sensing at the load point, compensating for PCB trace resistance between the regulator output and the powered device. When connected directly to the load's VCC rail, it improves load regulation accuracy. It also supports external NPN transistor augmentation for higher-current applications - a capability not present in standard LDOs like the MAX6470 series.
Does the MAX6476TA30BD3+T support adjustable output voltage?
No, the MAX6476TA30BD3+T has a fixed 3.0V output. It belongs to the MAX6475/MAX6476 subgroup, which uses the FB pin for remote sensing-not for adjustable output. Adjustable-output variants (e.g., MAX6469–MAX6472) use the SET pin instead. Attempting to configure MAX6476TA30BD3+T for adjustable output will result in incorrect regulation or instability.
What is the minimum input voltage required for the MAX6476TA30BD3+T to maintain 3.0V output at 300mA?
The MAX6476TA30BD3+T requires a minimum input voltage of 3.114V to maintain 3.0V output at 300mA load, based on its guaranteed 114mV dropout voltage. At lower inputs (e.g., 3.05V), output drops below specification. This allows operation from a single Li-ion cell down to ~3.1V - critical for maximizing battery utilization in portable designs.
How does the MAX6476TA30BD3+T handle reverse current when the input source is disconnected?
When the input source is removed and VOUT exceeds VIN, the MAX6476TA30BD3+T blocks reverse current flow with only 0.01µA typical leakage from OUT to IN. This prevents back-powering or charging of disconnected batteries. During this condition, RESET remains asserted until VIN rises above VOUT and VOUT exceeds 2.625V, ensuring system remains in safe reset state.
Can the MAX6476TA30BD3+T be used without connecting the exposed pad (EP)?
No - the exposed pad (EP) on the MAX6476TA30BD3+T is internally connected to GND and serves as the primary thermal conduction path. Leaving it unconnected degrades thermal performance, risks junction overheating above 150°C under 300mA load, and violates Absolute Maximum Ratings. It must be soldered to a dedicated PCB ground plane with ≥4 thermal vias for reliable operation.
MAX6476TA30BD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 (3V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.19V @ 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 (3x3)
MAX6476TA30BD3+T FAQ
1.How can I place an order for MAX6476TA30BD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6476TA30BD3+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 MAX6476TA30BD3+T reliable?
The price and inventory of MAX6476TA30BD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6476TA30BD3+T is usually 5 days.
3.What payment methods are accepted for MAX6476TA30BD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6476TA30BD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6476TA30BD3+T?
MAX6476TA30BD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6476TA30BD3+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 MAX6476TA30BD3+T?
For technical support, including MAX6476TA30BD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6476TA30BD3+T requirements.
6.How does Aetrix verify that MAX6476TA30BD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6476TA30BD3+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 MAX6476TA30BD3+T meets industry standards.
7.What is the process for return or replacement of MAX6476TA30BD3+T?
All MAX6476TA30BD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6476TA30BD3+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 MAX6476TA30BD3+T part is unused and in its original packaging.
Return procedure for MAX6476TA30BD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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