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Analog Devices Inc./Maxim Integrated MAX6476TA18AD3+T
- Part No.:
- MAX6476TA18AD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6476TA18AD3+T.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,713
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Product details
Overview
MAX6476TA18AD3+T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 1.8V output voltage, -7.5% reset threshold accuracy, and 150ms (min) reset timeout period. It features 82µA quiescent current, 55mV dropout at 150mA, and shutdown current of 0.1µA (typ). Designed for battery-powered portable equipment including Bluetooth modules and digital cameras.
For engineers reviewing the MAX6476TA18AD3+T datasheet, MAX6476TA18AD3+T pinout, MAX6476TA18AD3+T application, or MAX6476TA18AD3+T equivalent, key selection considerations include its remote feedback (FB) pin for external NPN transistor use, TDFN-EP 8-pin package with exposed pad, guaranteed ±2.0% output voltage accuracy over -40°C to +85°C, and compatibility with 2.5V–5.5V input range.
Technical Context
The MAX6476TA18AD3+T integrates a precision LDO regulator core and a fully self-contained reset supervisor sharing the same reference. Its FB pin enables remote sensing and high-current extension via external NPN transistor-unlike SET-based variants-making it suitable for applications requiring load-side voltage regulation or >300mA total current delivery. The device asserts active-low RESET when FB falls below 92.5% of nominal VOUT (i.e., 1.665V for 1.8V output), with built-in 150ms minimum timeout after recovery.
It operates within 2.5V–5.5V input range and supports shutdown via active-low SHDN pin, reducing supply current to 0.1µA. Thermal shutdown activates at +180°C (20°C hysteresis), and reverse OUT-to-IN leakage is limited to 0.01µA (typ), enabling safe battery backup operation without reverse charging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2.0% over -40°C to +85°C - ensures stable core logic supply for 1.8V microcontrollers and memory. |
| Max Output Current | 300mA guaranteed - sufficient for mid-power SoCs or sensor subsystems without external pass devices. |
| Dropout Voltage | 55mV at 150mA - enables operation from single-cell Li-ion (3.0V min) while maintaining regulation down to 1.855V input. |
| Quiescent Current | 82µA - extends battery life in always-on monitoring circuits such as Bluetooth LE peripherals. |
| Reset Threshold | -7.5% of VOUT (92.5% of 1.8V = 1.665V) - meets standard µP supply tolerance requirements before asserting RESET. |
| Reset Timeout | 150ms (min) - provides sufficient stabilization time for clock oscillators and PLLs before processor release. |
| Shutdown Current | 0.1µA (typ) - enables ultra-low-power deep-sleep modes in portable instrumentation. |
Pinout & Package
MAX6476TA18AD3+T is housed in an 8-pin TDFN-EP (3mm × 3mm) package with exposed thermal pad (EP), rated for 1951mW max power dissipation at +70°C ambient. The EP must be soldered to PCB ground plane for thermal integrity and electrical grounding.
| 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 Heatsink | Primary return path and thermal conduction node; must connect to large copper area or ground plane. |
| 3 (SHDN) | Active-Low Shutdown Control | Pulling low disables regulator and reduces IQ to 0.1µA; tie to IN for normal operation. |
| 4 (RESET) | Active-Low Reset Output | Push-pull configuration; asserts low during power-up, brownout, or SHDN activation; holds for ≥150ms post-recovery. |
| 5 (FB) | Remote Feedback Sense | Connects directly to load VCC point to compensate for PCB trace IR drop; enables external NPN transistor for current boost. |
| 6 (OUT) | Regulator Output | Delivers regulated 1.8V; requires ≥3.3µF low-ESR ceramic capacitor to GND at point-of-load. |
| 7–8 (NC) | No Connect | Not internally bonded; left unconnected per datasheet guidance. |
| EP | Exposed Thermal Pad | Internally connected to GND; must be soldered to PCB ground plane for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Remote Feedback (FB) Pin | Enables precise load-side regulation and supports external NPN transistor for >300mA total current delivery. |
| Low Dropout at Full Load | 114mV at 300mA - maintains regulation even with tight input margins (e.g., 1.914V input for 1.8V output). |
| Integrated Microprocessor Reset | Eliminates need for discrete supervisor IC; includes programmable timeout (150ms) and -7.5% threshold accuracy. |
| Reverse Current Protection | 0.01µA OUT-to-IN leakage - prevents battery backfeed during hot-swap or backup-supply scenarios. |
| Thermal & Short-Circuit Protection | Auto-shutdown at +180°C with 20°C hysteresis; 450mA current limit protects against sustained overload. |
Applications
| Wireless Sensor Node | Digital Camera Core Supply |
|---|---|
Use Scenario: Compact battery-powered environmental sensor with BLE radio and 1.8V image signal processor. IC Role / Device Role / Timing Role: Primary 1.8V power rail regulator with integrated reset supervision for coordinated power sequencing. Use Value: Remote FB pin compensates for PCB trace resistance between regulator and ISP, ensuring accurate 1.8V at load under dynamic current steps. |
Use Scenario: Portable digital camera requiring stable 1.8V supply for CMOS image sensor and baseband processor. IC Role / Device Role / Timing Role: Main LDO delivering regulated 1.8V with guaranteed reset assertion during battery insertion/removal. Use Value: 150ms reset timeout ensures oscillator stabilization before sensor initialization, preventing corrupted frame capture. |
| Industrial Handheld Terminal | USB-Powered Test Instrument |
Use Scenario: Ruggedized handheld terminal with 1.8V FPGA fabric and real-time OS. IC Role / Device Role / Timing Role: System power manager providing regulated 1.8V and deterministic reset signaling during cold/warm boot. Use Value: Shutdown current of 0.1µA enables multi-year battery life in sleep mode; SHDN pin allows firmware-controlled power gating. |
Use Scenario: USB-powered oscilloscope probe with embedded ADC and 1.8V digital core. IC Role / Device Role / Timing Role: Local LDO converting 5V USB bus to clean 1.8V, with reset coordination for USB enumeration timing. Use Value: 82µA quiescent current minimizes USB port loading; push-pull RESET ensures fast, noise-immune reset edge for USB controller sync. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6476TA25AD3+T | Fixed 2.5V output; identical package, pinout, and reset timing. | Used where system requires 2.5V I/O or analog supply instead of 1.8V core rail. | Select when target voltage matches 2.5V; no layout change required. |
| TPS7A0518PDBVR | Single-function 1.8V LDO (no integrated reset); SOT-23-5 package; 25µA IQ; 170mV dropout @ 300mA. | Requires external reset IC (e.g., TPS3808G18) for supervisor functionality. | Choose if lower IQ or smaller footprint is prioritized and reset can be implemented separately. |
Compared with MAX6476TA18AD3+T, the MAX6476TA25AD3+T offers identical integration and timing but targets 2.5V systems, while the TPS7A0518PDBVR trades integrated reset for lower quiescent current and smaller size-requiring additional components for full supervisory capability.
Availability
MAX6476TA18AD3+T is available at Aetrix Electronics and suitable for wireless sensor nodes, digital camera core supplies, industrial handheld terminals, and USB-powered test instruments requiring stable component supply with long-term lifecycle support.
Supply support for MAX6476TA18AD3+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 delivers highly integrated LDO regulators with embedded reset functionality specifically for space-constrained, battery-operated portable electronics requiring reliable power sequencing and low IQ.
FAQ
What is the function of the FB pin on the MAX6476TA18AD3+T?
The FB (Feedback) pin on the MAX6476TA18AD3+T is a remote sense input that connects directly to the load's VCC point-not to the OUT pin-enabling compensation for PCB trace voltage drop. It also supports external NPN transistor configurations to extend output current beyond 300mA. This differs from SET-pin variants and is essential for high-accuracy load regulation in the MAX6476TA18AD3+T.
Does the MAX6476TA18AD3+T support shutdown mode, and what is its current draw?
Yes, the MAX6476TA18AD3+T supports active-low shutdown via the SHDN pin. When SHDN is pulled low, the regulator disables and supply current drops to 0.1µA (typical), as specified in the Electrical Characteristics table. This ultra-low shutdown current makes the MAX6476TA18AD3+T suitable for battery-backed applications requiring multi-year shelf life, such as smart meters or IoT edge sensors.
What reset timeout period is implemented in the MAX6476TA18AD3+T?
The MAX6476TA18AD3+T implements a 150ms (minimum) reset timeout period, indicated by the "D3" suffix in its part number. After VOUT rises above the -7.5% reset threshold (1.665V), RESET remains asserted for at least 150ms to ensure system clocks and processors stabilize before release. This value is factory-programmed and not user-adjustable.
Can the MAX6476TA18AD3+T be used with a backup supercapacitor on the OUT rail?
Yes, the MAX6476TA18AD3+T supports backup operation: when IN is removed, OUT can be held up by a supercapacitor connected to the output rail. The device draws only ~40µA (typ) from OUT to GND in this state, and RESET asserts to signal power loss. The MAX6476TA18AD3+T's reverse leakage protection (0.01µA OUT-to-IN) prevents backfeeding into a depleted battery source during backup mode.
Is the MAX6476TA18AD3+T pin-compatible with other members of the MAX6469–MAX6484 family?
The MAX6476TA18AD3+T shares the same 8-pin TDFN-EP package and pinout with all TA-suffix variants (e.g., MAX6476TA25AD3+T), including identical IN, GND, SHDN, RESET, FB, and OUT assignments. However, it is not pin-compatible with UT-suffix (SOT23-6) or UCSP-packaged variants due to differing pin count and layout. Always verify package code before board reuse.
MAX6476TA18AD3+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 (1.8V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- -
- 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)
MAX6476TA18AD3+T FAQ
1.How can I place an order for MAX6476TA18AD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6476TA18AD3+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 MAX6476TA18AD3+T reliable?
The price and inventory of MAX6476TA18AD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6476TA18AD3+T is usually 5 days.
3.What payment methods are accepted for MAX6476TA18AD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6476TA18AD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6476TA18AD3+T?
MAX6476TA18AD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6476TA18AD3+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 MAX6476TA18AD3+T?
For technical support, including MAX6476TA18AD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6476TA18AD3+T requirements.
6.How does Aetrix verify that MAX6476TA18AD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6476TA18AD3+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 MAX6476TA18AD3+T meets industry standards.
7.What is the process for return or replacement of MAX6476TA18AD3+T?
All MAX6476TA18AD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6476TA18AD3+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 MAX6476TA18AD3+T part is unused and in its original packaging.
Return procedure for MAX6476TA18AD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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