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Analog Devices Inc./Maxim Integrated MAX6475TA18AD3+
- Part No.:
- MAX6475TA18AD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6475TA18AD3+.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,761
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Product details
Overview
MAX6475TA18AD3+ 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 (A suffix), and 150ms minimum reset timeout (D3 suffix). It features active-low push-pull or open-drain RESET, shutdown input (SHDN), and remote feedback sense (FB) for external NPN transistor use in higher-current applications. Designed for battery-powered portable equipment requiring stable supply and reliable power-on reset.
For engineers reviewing the MAX6475TA18AD3+ datasheet, MAX6475TA18AD3+ pinout, MAX6475TA18AD3+ application, or MAX6475TA18AD3+ equivalent, key selection considerations include its 1.8V fixed output, FB-based remote sensing capability, 150ms reset timeout, shutdown current of 0.1µA, and TDFN-EP 8-pin package with exposed paddle - all critical for space-constrained, low-power embedded systems.
Technical Context
The MAX6475TA18AD3+ integrates a precision LDO regulator core with a fully self-contained reset supervisor using the same internal reference. Its FB pin is electrically isolated from OUT, enabling true remote voltage sensing at the load to compensate for PCB trace IR drop - a feature exclusive to the MAX6475/MAX6476/MAX6483/MAX6484 variants.
It implements dual-mode operation: preset 1.8V output when FB is connected to VCC (load), or adjustable output via external resistor divider if configured differently - though the MAX6475TA18AD3+ is factory-trimmed for fixed 1.8V. The reset circuit asserts active-low RESET when FB falls below 92.5% of nominal VOUT (i.e., 1.665V), with guaranteed 150ms minimum timeout after recovery.
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 FPGAs. |
| Max Output Current | 300mA guaranteed - sufficient to power SoCs, sensors, and RF transceivers without external pass devices. |
| Dropout Voltage | 114mV at 300mA load - enables regulation from 1.914V input, supporting single-cell Li-ion or 2-cell alkaline operation. |
| Supply Current | 82µA typical - minimizes quiescent drain in always-on battery backup circuits. |
| Shutdown Current | 0.1µA typical - reduces system standby power to nanoampere level during deep sleep modes. |
| Reset Threshold | -7.5% of 1.8V (1.665V min) - meets standard µP supply tolerance requirements while avoiding false resets. |
| Reset Timeout | 150ms minimum - provides adequate stabilization time for clock oscillators and memory initialization before processor release. |
| Input Voltage Range | 2.5V to 5.5V - compatible with common intermediate rails including 3.3V and 5V systems. |
Pinout & Package
MAX6475TA18AD3+ is housed in an 8-pin TDFN-EP (3mm × 3mm) package with exposed thermal pad. The EP pad must be soldered to PCB ground plane for thermal management and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator Input | Accepts 2.5–5.5V input; requires 0.1µF bypass capacitor to GND for stability. |
| 2 (GND) | Ground / Thermal Pad | Primary return path and heatsink; must connect to large copper area or ground plane. |
| 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 Reset Output | Push-pull or open-drain configuration; asserts low for ≥150ms after VOUT/FB recovers from undervoltage. |
| 5 (FB) | Remote Feedback Sense | Connects directly to load VCC point to compensate for PCB trace resistance; not internally tied to OUT. |
| 6 (OUT) | Regulator Output | Delivers regulated 1.8V; requires ≥3.3µF low-ESR ceramic capacitor to GND at the IC pin. |
| 7–8 (EP) | Exposed Paddle | Internally connected to GND; mandatory thermal connection to PCB ground plane for reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Remote Feedback Sense (FB) | Enables precise load-point regulation by sensing voltage at the powered device, eliminating up to 100mV of trace IR drop error. |
| 150ms Minimum Reset Timeout | Guarantees sufficient time for crystal oscillator startup and memory initialization before releasing processor reset. |
| 0.1µA Shutdown Current | Allows integration into ultra-low-power wake-on-event architectures without compromising battery life. |
| Reverse Current Protection | 0.01µA max OUT-to-IN leakage prevents backfeeding and battery discharge when input is removed. |
| Thermal Shutdown with Hysteresis | Activates at +180°C and re-enables only after 20°C cooldown, preventing thermal runaway during sustained overload. |
Applications
| Handheld Instruments | Bluetooth Modules |
|---|---|
Use Scenario: Powering ARM Cortex-M4 microcontroller and analog front-end in a portable multimeter with Li-ion battery backup. IC Role / Device Role: Primary 1.8V core supply regulator with integrated reset supervision and remote sensing at MCU VDD pin. Use Value: Eliminates need for discrete supervisor IC and compensates for 80mV trace drop between regulator and MCU, ensuring reliable boot at cold temperatures. |
Use Scenario: Supplying baseband processor and BLE radio in compact wireless sensor node operating from coin cell. IC Role / Device Role: Low-quiescent LDO delivering 1.8V with shutdown control synchronized to radio sleep/wake cycles. Use Value: 0.1µA shutdown current extends shelf life beyond 5 years; 150ms reset timeout guarantees BLE stack initialization completes before link establishment. |
| Notebook Subsystem | Digital Camera Core |
Use Scenario: Providing always-on 1.8V rail for embedded controller (EC) and touchpad interface in ultrabook platform. IC Role / Device Role: Secondary LDO with FB-connected to EC VDD for accurate voltage regulation under dynamic load transients. Use Value: Remote sensing maintains ±1.5% regulation at EC pin despite 120mA load steps, preventing EC lockup during USB hotplug events. |
Use Scenario: Powering image signal processor (ISP) and CMOS sensor interface in DSLR camera body. IC Role / Device Role: Reset-enabled 1.8V supply ensuring clean power-up sequence for ISP firmware loading and sensor calibration. Use Value: Integrated -7.5% reset threshold and 150ms timeout prevent partial initialization that could corrupt image pipeline registers during brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6475TA25AD3+ | Same package and features, but fixed 2.5V output instead of 1.8V; identical reset timing and FB functionality. | Used where system requires 2.5V I/O domain instead of 1.8V core logic; not interchangeable without board-level voltage change. | Select only if target application mandates 2.5V output; pinout and layout are identical. |
| TPS79918YZTT | 1.8V LDO with 200mA output, no integrated reset or FB pin; requires external supervisor IC for reset function. | Suitable for cost-sensitive designs where reset is handled separately; lacks remote sensing and shutdown current advantage. | Choose when reset timing is managed externally and 300mA drive is not required; adds BOM count and layout complexity. |
Compared with MAX6475TA18AD3+, the MAX6475TA25AD3+ offers identical architecture but different output voltage, while the TPS79918YZTT trades integration for lower cost and reduced current capability - making MAX6475TA18AD3+ optimal for compact, high-reliability 1.8V systems needing autonomous reset and load-point accuracy.
Availability
MAX6475TA18AD3+ is available at Aetrix Electronics and suitable for handheld instruments, Bluetooth modules, and notebook subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6475TA18AD3+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for industrial, communications, and consumer applications.
The MAX6469–MAX6484 product line was designed specifically for battery-powered portable electronics requiring ultra-low quiescent current, integrated power supervision, and flexible output configurations - with MAX6475TA18AD3+ targeting 1.8V core logic domains.
FAQ
What is the exact output voltage tolerance of the MAX6475TA18AD3+ over temperature?
The MAX6475TA18AD3+ guarantees ±2.0% output voltage accuracy over the full -40°C to +85°C operating range. This specification applies to fixed-output operation with FB connected to the load VCC, and ensures stable 1.8V supply for sensitive digital cores even under thermal stress.
Can the MAX6475TA18AD3+ be used without connecting the FB pin?
No - the MAX6475TA18AD3+ requires the FB pin to be connected to the load's VCC point to function correctly. Unlike standard LDOs, its FB pin is not internally tied to OUT; leaving it floating or unconnected will cause regulation failure and unpredictable reset behavior. Always route FB directly to the powered device's supply pin.
What does the 'D3' suffix in MAX6475TA18AD3+ indicate?
Within the MAX6469–MAX6484 family, the 'D3' suffix specifies a minimum reset timeout period of 150ms. This value is factory-programmed and cannot be adjusted externally. It ensures the RESET signal remains asserted long enough for clock oscillators and memory subsystems to stabilize before processor release in the MAX6475TA18AD3+.
Does the MAX6475TA18AD3+ support open-drain RESET configuration?
Yes - the MAX6475TA18AD3+ supports both push-pull and open-drain active-low RESET outputs. The configuration is determined by the specific variant ordering code; the 'A' in the suffix (as in MAX6475TA18AD3+) denotes push-pull, while 'B' would indicate open-drain. Always verify the full part number's RESET type in the official datasheet.
How does the remote feedback (FB) pin improve regulation accuracy in the MAX6475TA18AD3+?
The FB pin in the MAX6475TA18AD3+ senses voltage directly at the load (e.g., MCU VDD), not at the IC's OUT pin. This compensates for voltage drop across PCB traces and connectors - typically 50–100mV - ensuring the powered device receives precisely 1.8V regardless of layout parasitics, which is critical for reliable low-voltage operation.
MAX6475TA18AD3+ 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)
MAX6475TA18AD3+ FAQ
1.How can I place an order for MAX6475TA18AD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6475TA18AD3+ 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 MAX6475TA18AD3+ reliable?
The price and inventory of MAX6475TA18AD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6475TA18AD3+ is usually 5 days.
3.What payment methods are accepted for MAX6475TA18AD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6475TA18AD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6475TA18AD3+?
MAX6475TA18AD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6475TA18AD3+ 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 MAX6475TA18AD3+?
For technical support, including MAX6475TA18AD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6475TA18AD3+ requirements.
6.How does Aetrix verify that MAX6475TA18AD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6475TA18AD3+ 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 MAX6475TA18AD3+ meets industry standards.
7.What is the process for return or replacement of MAX6475TA18AD3+?
All MAX6475TA18AD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6475TA18AD3+, 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 MAX6475TA18AD3+ part is unused and in its original packaging.
Return procedure for MAX6475TA18AD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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