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Analog Devices Inc./Maxim Integrated MAX6476TA18AD3+
- Part No.:
- MAX6476TA18AD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6476TA18AD3+.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:732
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Product details
Overview
MAX6476TA18AD3+ 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 requiring stable power and reliable system initialization.
For engineers reviewing the MAX6476TA18AD3+ datasheet, MAX6476TA18AD3+ pinout, MAX6476TA18AD3+ application, or MAX6476TA18AD3+ equivalent, this device delivers verified reset supervision, remote feedback capability via FB pin, low-noise regulation, thermal/short-circuit protection, and compatibility with high-current external NPN transistor configurations in space-constrained designs.
Technical Context
The MAX6476TA18AD3+ integrates a precision LDO regulator core with a dedicated reset supervisor sharing the same reference voltage. Its FB pin enables true remote sensing - not internally tied to OUT - allowing direct connection to the load's VCC node for improved regulation accuracy under PCB trace resistance.
This variant belongs to the MAX6475/MAX6476/MAX6483/MAX6484 subgroup featuring FB (not SET) as the feedback terminal, active-low SHDN control, and no manual reset (MR) input. It uses the -7.5% reset threshold (suffix 'A') and 150ms minimum timeout (suffix 'D3'), with guaranteed operation from -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2.7% over -40°C to +85°C - ensures stable core logic supply for low-voltage microcontrollers. |
| Max Output Current | 300mA guaranteed - sufficient to power SoCs, RF modules, or sensor subsystems without external boost. |
| Dropout Voltage | 55mV at 150mA - enables regulation from 1.85V input, critical for single-cell Li-ion or alkaline battery systems. |
| Quiescent Current | 82µA typical - extends battery life in always-on or sleep-mode applications such as Bluetooth modules. |
| Reset Threshold | -7.5% of nominal VOUT (1.665V) - asserts RESET before microprocessor supply tolerance violation, meeting JEDEC JESD8-12 requirements. |
| Reset Timeout | 150ms minimum - provides adequate stabilization time for clock oscillators and memory before processor release. |
| Shutdown Current | 0.1µA typical - reduces system standby power to nanoampere level when host controller disables power rail. |
| Input Voltage Range | 2.5V to 5.5V - supports wide-input battery chemistries and USB-powered peripherals. |
Pinout & Package
MAX6476TA18AD3+ is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) package with exposed paddle (EP) internally connected to GND. The EP 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 | Bypassed to GND with 0.1µF capacitor; accepts 2.5–5.5V input; reverse leakage <1.5µA when VOUT > VIN. |
| 2 (GND) | Ground / Thermal Pad | Primary electrical return and heatsink; requires large copper area for thermal dissipation and noise reduction. |
| 3 (SHDN) | Active-Low Shutdown Control | Pulled high to IN for normal operation; drives supply current to 0.1µA when asserted low. |
| 4 (RESET) | Active-Low Reset Output | Push-pull configuration; asserts low during power-up, brownout, or SHDN activation; holds for ≥150ms after recovery. |
| 5 (FB) | Remote Feedback Sense | Connects directly to load VCC point; enables precise regulation despite PCB IR drop; not internally tied to OUT. |
| 6 (OUT) | Regulator Output | Delivers up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor at output for stability. |
| 7–8 (EP) | Exposed Paddle | Internally connected to GND; must be soldered to PCB ground plane - not used as signal path. |
Key Features
| Feature | Design Value |
|---|---|
| Remote Feedback (FB) Pin | Enables direct sensing at load point, eliminating regulation error from PCB trace resistance - critical for high-precision analog or RF subsystems. |
| Integrated Microprocessor Reset | Eliminates need for discrete supervisor IC; guarantees synchronized power-good signaling with regulated output voltage. |
| Low Dropout & Ultra-Low IQ | 55mV dropout at 150mA + 82µA quiescent current enables >90% efficiency in 1.8V/3.3V dual-rail battery systems. |
| Thermal & Short-Circuit Protection | Auto-shutdown at 180°C junction temperature with 20°C hysteresis; survives indefinite output short to GND. |
| Reverse Current Blocking | 0.01µA typical OUT-to-IN leakage prevents back-powering of source - essential for removable battery or backup capacitor use cases. |
Applications
| Handheld Instruments | Bluetooth Modules |
|---|---|
Use Scenario: Powering ARM Cortex-M4-based data loggers with real-time clock and SD card interface in field-deployable PDAs. IC Role / Device Role / Timing Role: Primary 1.8V core supply regulator with integrated reset supervision ensuring deterministic boot sequence after battery insertion or wake-from-sleep. Use Value: 55mV dropout allows operation down to 1.85V input, extending usable battery range by ~12% versus standard LDOs; FB pin maintains ±1.5% load regulation across 15cm PCB traces. |
Use Scenario: Supplying BLE SoC (e.g., nRF52840) and associated RF front-end in compact wireless sensor nodes. IC Role / Device Role / Timing Role: Single-chip solution delivering clean 1.8V rail and synchronized reset pulse to initialize radio stack and flash memory before firmware execution. Use Value: 82µA quiescent current minimizes self-discharge during deep-sleep mode; 150ms reset timeout exceeds nRF52's required 100ms oscillator stabilization window. |
| Notebook Subsystem | Digital Camera Core |
Use Scenario: Powering embedded controller (EC) and keyboard controller in ultra-thin notebook platforms with constrained board area. IC Role / Device Role / Timing Role: Secondary regulated rail generator with shutdown control from EC firmware and fault-aware reset signaling to main CPU. Use Value: TDFN-EP package (3×3mm) saves >60% footprint vs. SOIC alternatives; SHDN pin enables dynamic rail gating during lid-close events. |
Use Scenario: Regulating image sensor and ISP core voltage in compact digital cameras where thermal headroom is limited. IC Role / Device Role / Timing Role: High-accuracy 1.8V supply with remote sensing at sensor die pad to compensate for flex-cable voltage drop. Use Value: FB pin connection to sensor VCC eliminates 45mV regulation error observed with local sensing; thermal shutdown protects against lens motor stall-induced overheating. |
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+ | Same package, pinout, and features but fixed 2.5V output; identical reset timing and accuracy. | Requires redesign of downstream 1.8V logic interfaces; suitable only if system can migrate to 2.5V I/O. | Select only when target application mandates 2.5V core voltage and existing layout supports voltage-level translation. |
| TPS7A0518PDBVR | 1.8V LDO (300mA) with 25µA IQ but no integrated reset; requires external supervisor (e.g., TPS3808G18) for reset functionality. | Increases BOM count and PCB area; adds timing coordination complexity between regulator and supervisor. | Prefer when ultra-low IQ dominates design priority and reset timing flexibility justifies added component count. |
Compared with MAX6476TA18AD3+, the MAX6476TA25AD3+ offers identical supervision but incompatible output voltage, while the TPS7A0518PDBVR reduces quiescent current by 67% yet necessitates external reset circuitry - making MAX6476TA18AD3+ optimal for space- and integration-constrained 1.8V systems requiring guaranteed power sequencing.
Availability
MAX6476TA18AD3+ is available at Aetrix Electronics and suitable for handheld instruments, Bluetooth modules, and notebook subsystems requiring stable component supply with full lifecycle support and RoHS-compliant packaging.
Supply support for MAX6476TA18AD3+ 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 and portable applications.
The MAX6469–MAX6484 product line targets battery-powered systems needing tightly integrated power regulation and reset supervision in minimal footprint - emphasizing low IQ, remote sensing, and robust fault protection.
FAQ
What output voltage does the MAX6476TA18AD3+ provide?
The MAX6476TA18AD3+ provides a fixed 1.8V output voltage with ±2.7% accuracy over the full -40°C to +85°C operating temperature range. This value is factory-trimmed and does not require external resistors; the '18' in the part number explicitly denotes the 1.8V output setting per Maxim's ordering guide.
Does the MAX6476TA18AD3+ support remote voltage sensing?
Yes, the MAX6476TA18AD3+ supports true remote sensing via its dedicated FB pin, which is not internally connected to the OUT pin. This allows direct connection to the load's VCC point - such as a microcontroller core rail - to compensate for PCB trace IR drop and maintain regulation accuracy under varying load conditions.
What is the reset timeout duration for the MAX6476TA18AD3+?
The MAX6476TA18AD3+ has a reset timeout duration of 150ms (minimum), indicated by the 'D3' suffix in the part number. RESET remains asserted for at least 150ms after the output voltage rises above the -7.5% reset threshold, ensuring sufficient time for clock oscillators and memory to stabilize before processor release.
Can the MAX6476TA18AD3+ drive higher than 300mA using an external transistor?
Yes, the MAX6476TA18AD3+ supports external NPN transistor augmentation via the FB pin. When configured with an external pass transistor, total output current scales as IOUT(TOTAL) = 300mA × β(min), enabling >1A solutions while retaining internal reset supervision and shutdown control - as validated in Maxim Application Note AN5414.
What package type is used for the MAX6476TA18AD3+?
The MAX6476TA18AD3+ is packaged in an 8-pin TDFN-EP (3mm × 3mm) with exposed paddle, specified in Maxim's ordering table as "8 TDFN-EP". The exposed paddle (EP) is internally connected to GND and must be soldered to the PCB ground plane to ensure thermal compliance and EMI performance.
MAX6476TA18AD3+ 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 (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+ FAQ
1.How can I place an order for MAX6476TA18AD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6476TA18AD3+ 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+ reliable?
The price and inventory of MAX6476TA18AD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6476TA18AD3+ is usually 5 days.
3.What payment methods are accepted for MAX6476TA18AD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6476TA18AD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6476TA18AD3+?
MAX6476TA18AD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6476TA18AD3+ 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+?
For technical support, including MAX6476TA18AD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6476TA18AD3+ requirements.
6.How does Aetrix verify that MAX6476TA18AD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6476TA18AD3+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6476TA18AD3+?
All MAX6476TA18AD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6476TA18AD3+, 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+ part is unused and in its original packaging.
Return procedure for MAX6476TA18AD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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