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Analog Devices Inc./Maxim Integrated MAX6476TA33AD3+T
- Part No.:
- MAX6476TA33AD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6476TA33AD3+T.pdf
- Description:
- IC REG LINEAR LDO WITH MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6476TA33AD3+T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 3.3V output, -12.5% reset threshold accuracy (suffix 'A'), and 150ms minimum reset timeout (suffix 'D3'). It features 82µA quiescent current, 114mV dropout at 300mA load, and remote feedback (FB) pin for external NPN transistor support in high-current applications. Designed for battery-powered portable electronics requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6476TA33AD3+T datasheet, MAX6476TA33AD3+T pinout, MAX6476TA33AD3+T application, or MAX6476TA33AD3+T equivalent, this device delivers verified 3.3V regulation with integrated reset supervision, shutdown control, thermal/short-circuit protection, and remote sense capability - critical for compact, low-power embedded systems where supply stability and processor initialization integrity are non-negotiable.
Technical Context
The MAX6476TA33AD3+T implements a single-stage LDO regulator core with internal bandgap reference and error amplifier, supporting input voltages from 2.5V to 5.5V and delivering up to 300mA with ±2.0% output voltage accuracy over -40°C to +85°C. Its reset supervisor uses the same reference to monitor FB voltage against a -12.5% threshold, asserting active-low RESET for ≥150ms after recovery.
This variant belongs to the MAX6475/MAX6476/MAX6483/MAX6484 subgroup featuring dedicated FB (not SET) pin for remote sensing, enabling external NPN pass transistor configurations. It includes active-low SHDN for 0.1µA shutdown current, reverse current protection (0.01µA OUT→IN leakage), and thermal shutdown at +180°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.0% over temperature - ensures stable core logic supply for 3.3V microcontrollers and peripherals. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-complexity SoCs, RF modules, or sensor subsystems without external boost. |
| Dropout Voltage | 114mV at 300mA - enables operation down to VIN = 3.414V, extending battery runtime in single-cell Li-ion or 3×alkaline systems. |
| Quiescent Current | 82µA typical - minimizes standby drain in always-on portable devices like Bluetooth modules or smart sensors. |
| Reset Threshold | -12.5% of VOUT (i.e., 2.8875V) - provides tighter supply monitoring than -7.5% variants, suitable for noise-sensitive digital loads. |
| Reset Timeout | 150ms minimum - ensures sufficient hold-off time for clock oscillator stabilization and memory initialization before processor release. |
| Shutdown Current | 0.1µA typical - enables ultra-low-power sleep states in handheld instruments and wearables. |
| Input Voltage Range | 2.5V to 5.5V - compatible with common battery chemistries (Li-ion, Li-poly, 3×AA/AAA) and USB-powered designs. |
Pinout & Package
MAX6476TA33AD3+T 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 (active-low, open-drain/push-pull configurable); Pin 5 is FB (feedback/remote sense input); 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 |
|---|---|---|
| IN | Regulator input | Bypassed with 0.1µF capacitor to GND; accepts 2.5V–5.5V input; powers internal LDO and reset circuitry. |
| GND | Ground reference & thermal path | Electrical return and primary heat sink; must connect to large copper area or ground plane for thermal dissipation. |
| SHDN | Active-low shutdown control | Pulled high to IN for normal operation; pulling low disables regulator and reduces supply current to 0.1µA. |
| RESET | Active-low reset output | Asserts low when FB < 2.8875V or during power-up/brownout; remains low ≥150ms after recovery; open-drain capable. |
| FB | Remote feedback input | Connects to load VCC point for remote sensing; enables external NPN transistor for >300mA total current delivery. |
| OUT | Regulated output | Delivers 3.3V @ up to 300mA; requires ≥3.3µF ceramic capacitor (ESR < 0.2Ω) on PCB for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated microprocessor reset | Eliminates need for discrete supervisor IC; monitors FB voltage with -12.5% threshold and 150ms timeout. |
| Remote feedback (FB) pin | Enables external NPN pass transistor configuration to scale output current beyond 300mA while maintaining regulation accuracy. |
| Ultra-low quiescent current | 82µA operating / 0.1µA shutdown - extends battery life in portable equipment with intermittent wake cycles. |
| Reverse current protection | 0.01µA typical OUT→IN leakage - prevents backup capacitors or batteries from discharging into depleted input sources. |
| Thermal & short-circuit protection | Shuts down at +180°C junction temp with 20°C hysteresis; sustains indefinite output short to GND without damage. |
| Low-noise operation | Not applicable to MAX6476 (UCSP-only variants MAX6477–MAX6484 specify 75µVRMS noise); MAX6476 relies on external filtering. |
Applications
| Handheld Medical Sensors | USB-Powered IoT Gateways |
|---|---|
|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by coin-cell or single Li-ion batteries. IC Role / Device Role / Timing Role: Primary 3.3V power source with integrated reset to ensure MCU boots only after stable VCC and clock startup. Use Value: 82µA quiescent current maximizes shelf life; 114mV dropout extends usable battery range; FB pin supports optional external transistor for display backlight drive. |
Use Scenario: Compact edge gateways connecting BLE/Wi-Fi sensors to cloud via USB-C host port. IC Role / Device Role / Timing Role: Regulates 5V USB input to clean 3.3V for SoC, memory, and radio; RESET coordinates firmware initialization sequence. Use Value: 150ms reset timeout guarantees proper oscillator lock and flash initialization; SHDN enables deep-sleep mode during network idle periods. |
| Industrial Handheld Scanners | Bluetooth Audio Accessories |
|
Use Scenario: Rugged barcode scanners using 3×AA alkaline batteries with frequent on/off cycling. IC Role / Device Role / Timing Role: Provides regulated 3.3V to image sensor, laser driver, and ARM Cortex-M MCU; RESET prevents erratic behavior during battery insertion/removal. Use Value: -12.5% reset threshold improves immunity to transient line noise; reverse current protection avoids backfeeding into weak batteries during hot-swap events. |
Use Scenario: True wireless stereo earbuds with Li-poly battery and dual-core audio DSP. IC Role / Device Role / Timing Role: Supplies 3.3V to DSP and Bluetooth radio; FB pin enables external transistor to handle peak current surges during codec startup. Use Value: 300mA rating covers dynamic load spikes; 0.1µA shutdown current preserves charge during weeks-long storage; thermal shutdown prevents overheating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6476TA33AD2+T | Same 3.3V output and FB pin, but 20ms reset timeout (D2) instead of 150ms (D3). | Suitable for fast-boot systems where shorter reset hold-off is acceptable (e.g., simple microcontrollers without external memory). | Select D2 if system initialization completes within 20ms; D3 required for DDR memory training or crystal oscillator stabilization. |
| MAX6476TA33BD3+T | Identical package, output, and timeout, but -7.5% reset threshold (B) vs. -12.5% (A). | Better suited for less noise-sensitive applications where looser supply tolerance is acceptable (e.g., legacy MCUs with wide VDD specs). | Choose B for cost-sensitive designs where tighter reset margin is unnecessary; A preferred for modern low-voltage logic with strict VDD windows. |
Compared with MAX6476TA33AD2+T and MAX6476TA33BD3+T, the MAX6476TA33AD3+T offers the longest reset timeout and tightest reset threshold among pin-compatible variants - making it optimal for systems demanding robust power-on sequencing and high immunity to supply transients.
Availability
MAX6476TA33AD3+T is available at Aetrix Electronics and suitable for handheld medical sensors, USB-powered IoT gateways, industrial handheld scanners, and Bluetooth audio accessories requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MAX6476TA33AD3+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 industrial, automotive, and consumer applications.
The MAX6469–MAX6484 product line targets battery-powered portable equipment needing integrated power regulation and microprocessor supervision - combining low IQ, high accuracy, and robust protection in space-constrained packages.
FAQ
What is the function of the FB pin on the MAX6476TA33AD3+T?
The FB (Feedback) pin on the MAX6476TA33AD3+T serves as a remote sense input, allowing connection directly to the load's VCC point to compensate for PCB trace resistance. It also enables use with an external NPN transistor to increase total output current beyond the 300mA internal limit. Unlike SET-pin variants, FB is not internally tied to OUT, giving designers flexibility in high-current or precision-regulation layouts. This functionality is confirmed in the MAX6475/MAX6476 datasheet section "Feedback Input".
Does the MAX6476TA33AD3+T support active-low shutdown, and what is its shutdown current?
Yes, the MAX6476TA33AD3+T supports active-low shutdown via the SHDN pin: pulling SHDN low disables the regulator and reduces total supply current to 0.1µA (typical). This ultra-low shutdown current is critical for battery longevity in intermittently powered devices. The SHDN pin accepts logic levels referenced to VIN, with VIH ≥ 0.7×VIN and VIL ≤ 0.3×VIN, as specified in the Electrical Characteristics table.
What reset timeout period does the 'D3' suffix indicate for the MAX6476TA33AD3+T?
The 'D3' suffix in MAX6476TA33AD3+T specifies a minimum reset timeout period of 150ms. This means the active-low RESET output remains asserted for at least 150ms after the FB voltage rises above the -12.5% threshold (2.8875V for 3.3V output), ensuring sufficient time for clock oscillators and memory subsystems to stabilize before releasing the microprocessor from reset.
How does the MAX6476TA33AD3+T provide reverse current protection?
The MAX6476TA33AD3+T incorporates internal circuitry that blocks reverse current flow from OUT to IN when the output voltage exceeds the input voltage - limiting leakage to just 0.01µA (typical). This prevents backup capacitors or secondary batteries from discharging into a depleted primary source. The feature is explicitly documented in the "Reverse Leakage Protection" section and validated under Absolute Maximum Ratings.
Is the MAX6476TA33AD3+T compatible with ceramic output capacitors, and what is the minimum recommended value?
Yes, the MAX6476TA33AD3+T is designed for stable operation with ceramic output capacitors. The datasheet specifies a minimum 3.3µF capacitance with ESR < 0.2Ω across the full -40°C to +85°C temperature range and up to 300mA load. Using a 3.3µF X5R/X7R ceramic capacitor placed close to the OUT and GND pins ensures loop stability and meets transient response requirements per Typical Operating Characteristics.
MAX6476TA33AD3+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 (3.3V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.18V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 136 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, 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)
MAX6476TA33AD3+T FAQ
1.How can I place an order for MAX6476TA33AD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6476TA33AD3+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 MAX6476TA33AD3+T reliable?
The price and inventory of MAX6476TA33AD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6476TA33AD3+T is usually 5 days.
3.What payment methods are accepted for MAX6476TA33AD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6476TA33AD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6476TA33AD3+T?
MAX6476TA33AD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6476TA33AD3+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 MAX6476TA33AD3+T?
For technical support, including MAX6476TA33AD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6476TA33AD3+T requirements.
6.How does Aetrix verify that MAX6476TA33AD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6476TA33AD3+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 MAX6476TA33AD3+T meets industry standards.
7.What is the process for return or replacement of MAX6476TA33AD3+T?
All MAX6476TA33AD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6476TA33AD3+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 MAX6476TA33AD3+T part is unused and in its original packaging.
Return procedure for MAX6476TA33AD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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