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Analog Devices Inc./Maxim Integrated MAX6475TA30BD3+
- Part No.:
- MAX6475TA30BD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6475TA30BD3+.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,414
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Product details
Overview
MAX6475TA30BD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 3.0V output, -12.5% reset threshold, 150ms minimum reset timeout, and remote feedback (FB) pin for external NPN transistor use in higher-current applications. It operates from 2.5V to 5.5V input, delivers ±2.0% output 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 MAX6475TA30BD3+ datasheet, MAX6475TA30BD3+ pinout, MAX6475TA30BD3+ application, or MAX6475TA30BD3+ equivalent, key selection considerations include its 3.0V fixed output, FB-based remote sensing capability, active-low push-pull/open-drain RESET with 150ms timeout, shutdown control (SHDN), and compatibility with high-current external pass transistors - all in an 8-pin TDFN-EP package with exposed thermal pad.
Technical Context
The MAX6475TA30BD3+ integrates a precision LDO regulator core and a fully self-contained reset supervisor sharing the same reference voltage. Its FB pin enables true remote voltage sensing at the load, decoupling regulation from PCB trace IR drop - critical for stable 3.0V supply to microprocessors under dynamic load.
Reset assertion is triggered when FB falls below 87.5% of nominal VOUT (i.e., 2.625V for 3.0V output), with guaranteed hold time of ≥150ms after recovery. The device supports shutdown via SHDN (reducing IQ to 0.1µA), includes reverse current protection (0.01µA OUT→IN leakage), and features thermal shutdown at +180°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±2.0% over -40°C to +85°C - ensures stable core logic supply for 3.3V/3.0V microcontrollers without external resistors. |
| Max Output Current | 300mA guaranteed - sufficient for mid-power SoCs and peripherals; supports up to ~1A total with external NPN transistor via FB pin. |
| Dropout Voltage | 114mV at 300mA load - enables operation down to VIN = 3.114V while maintaining regulated 3.0V output. |
| Supply Current | 82µA typical (no load), 0.1µA in shutdown - extends battery life in always-on or sleep-mode portable systems. |
| Reset Threshold | -12.5% of VOUT (87.5% of 3.0V = 2.625V) - provides conservative brownout detection aligned with microprocessor supply tolerance requirements. |
| Reset Timeout | 150ms minimum - satisfies boot-time stabilization requirements for most embedded processors and clock oscillators. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), 3-cell alkaline (3.6–4.5V), and USB-powered systems. |
Pinout & Package
MAX6475TA30BD3+ uses an 8-pin TDFN-EP (3mm × 3mm) package with exposed thermal pad (EP) internally connected to GND. The EP must be soldered to a PCB ground plane for optimal thermal performance and electrical stability.
| 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 and noise suppression. |
| 2 (GND) | Ground / Thermal Pad Anchor | Primary return path and thermal conduction path; must connect to large copper area or ground plane. |
| 3 (SHDN) | Active-Low Shutdown Control | Pulling low disables regulator and reduces supply current to 0.1µA; tie to IN for normal operation. |
| 4 (RESET) | Active-Low Reset Output | Push-pull or open-drain configurable; asserts low during power-up, brownout, or SHDN activation for ≥150ms. |
| 5 (FB) | Remote Feedback Sense | Connects directly to load VCC point to compensate for PCB trace resistance; enables external NPN pass transistor for >300mA loads. |
| 6 (OUT) | Regulator Output | Delivers regulated 3.0V; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response and stability. |
| EP | Exposed Thermal Pad | Internally tied to GND; mandatory connection to PCB ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Remote Feedback (FB) Pin | Enables precise regulation at load point, eliminating voltage drop errors across PCB traces - essential for tight-tolerance 3.0V digital rails. |
| Integrated Microprocessor Reset | Eliminates need for discrete supervisor IC; provides factory-trimmed -12.5% threshold and 150ms timeout with no external components. |
| Low Quiescent Current | 82µA operating / 0.1µA shutdown - minimizes battery drain in standby and sleep modes of handheld instruments and wireless modules. |
| Reverse Current Protection | 0.01µA max OUT→IN leakage - prevents backup capacitors or batteries from discharging into depleted input sources. |
| Thermal & Short-Circuit Protection | Auto-shutdown at +180°C with 20°C hysteresis and 450mA current limit - ensures robustness in compact, thermally constrained designs. |
Applications
| Handheld Instruments | Bluetooth/Wireless LAN Modules |
|---|---|
|
Use Scenario: Powering ARM Cortex-M based data loggers in PDAs and palmtop test equipment with single-cell Li-ion battery input. IC Role / Device Role / Timing Role: Primary 3.0V LDO regulator with integrated reset supervision ensuring clean processor boot and brownout recovery. Use Value: Remote FB sensing maintains 3.0V ±2% at MCU VCC pins despite 100mΩ PCB trace resistance; 150ms RESET guarantees oscillator stabilization before firmware execution. |
Use Scenario: Supplying 3.0V to Bluetooth 5.0 SoC and RF front-end in compact IoT sensor nodes powered by coin-cell or energy-harvesting sources. IC Role / Device Role / Timing Role: Low-IQ 3.0V regulator with shutdown control and precise reset timing for ultra-low-power duty-cycled operation. Use Value: 0.1µA shutdown current enables multi-year battery life; -12.5% reset threshold prevents erratic behavior during weak-battery brownout conditions. |
| Notebook Subsystem Power | Digital Camera Core Logic |
|
Use Scenario: Delivering 3.0V to embedded controller (EC) and keyboard controller in ultrabook platforms with shared 3.3V/5V system rail. IC Role / Device Role / Timing Role: Secondary regulated supply with independent reset signaling to coordinate EC initialization with main CPU power sequence. Use Value: Push-pull RESET output drives EC reset pin directly without pull-up; SHDN allows host-controlled power gating during suspend-to-RAM states. |
Use Scenario: Providing stable 3.0V to image signal processor (ISP) and CMOS sensor interface in DSLR and mirrorless camera bodies. IC Role / Device Role / Timing Role: High-PSRR LDO with remote sensing to reject switching noise from adjacent DC-DC converters powering motors and flash. Use Value: 75µVRMS output noise (MAX6477–MAX6484 family) and 114mV dropout ensure clean, ripple-free 3.0V for analog pixel readout circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6475TA30BD4+ | Same 3.0V output and -12.5% reset threshold, but 1200ms reset timeout instead of 150ms. | Suitable for systems requiring longer reset hold time (e.g., FPGA configuration or complex bootloaders). | Select MAX6475TA30BD4+ only if extended reset duration is explicitly required; otherwise MAX6475TA30BD3+ matches standard microprocessor timing. |
| TPS79930YZUR | 3.0V fixed LDO (200mA), no integrated reset circuit, no FB pin, 1.5µA IQ - lacks reset supervision and remote sensing. | Requires external supervisor (e.g., TPS3808G33) and cannot support external pass transistors. | Choose only if reset functionality is handled elsewhere and load current ≤200mA; MAX6475TA30BD3+ provides full integration and higher drive capability. |
Compared with MAX6475TA30BD4+, the MAX6475TA30BD3+ offers shorter, more typical reset timing for general-purpose microcontrollers; compared with TPS79930YZUR, it delivers integrated supervision, remote sensing, and 300mA drive - reducing BOM count and improving system-level reliability in space-constrained portable designs.
Availability
MAX6475TA30BD3+ is available at Aetrix Electronics and suitable for handheld instruments, wireless communication modules, notebook subsystems, and digital imaging systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6475TA30BD3+ 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, automotive, communications, and consumer markets.
The MAX6469–MAX6484 product line was designed specifically for battery-powered portable electronics needing highly integrated, low-quiescent-current power regulation with built-in microprocessor reset supervision - eliminating discrete supervisors and simplifying power architecture.
FAQ
What is the function of the FB pin on the MAX6475TA30BD3+?
The FB (Feedback) pin on the MAX6475TA30BD3+ is a dedicated remote sense input that connects directly to the load's VCC point - not to the OUT pin. This allows the regulator to compensate for voltage drop across PCB traces or connectors, maintaining precise 3.0V regulation at the actual load. It also enables use with an external NPN transistor to boost total output current beyond 300mA, as specified in the MAX6475TA30BD3+ datasheet.
Does the MAX6475TA30BD3+ support both push-pull and open-drain RESET outputs?
Yes, the MAX6475TA30BD3+ supports both push-pull and open-drain RESET configurations. The output type is determined by the specific variant ordering suffix - the "D" in MAX6475TA30BD3+ indicates open-drain RESET. Push-pull variants use "P" (e.g., MAX6475TA30BP3+). Both versions assert active-low RESET for ≥150ms during power-up, brownout, or SHDN activation, and share identical timing and threshold specifications.
What is the minimum input voltage required for the MAX6475TA30BD3+ to maintain 3.0V output at full 300mA load?
The MAX6475TA30BD3+ requires a minimum input voltage of 3.114V to maintain regulated 3.0V output at 300mA load, based on its guaranteed 114mV dropout voltage. At lighter loads, dropout decreases - e.g., 55mV at 150mA (VIN ≥ 3.055V). Input voltage must remain ≥2.5V for basic operation, but regulation fails below the dropout-limited threshold.
How does the MAX6475TA30BD3+ handle reverse current when the input source is disconnected?
The MAX6475TA30BD3+ includes internal reverse current protection that limits OUT-to-IN leakage to 0.01µA typical when VOUT > VIN. This prevents backup supercapacitors or batteries connected at OUT from discharging back into a removed or depleted input source. During such conditions, RESET asserts to signal loss of primary supply, enabling system-level low-power state entry while preserving volatile memory content.
Can the MAX6475TA30BD3+ be used without connecting the SHDN pin?
Yes, the MAX6475TA30BD3+ can operate without external SHDN control: connect SHDN to IN (or use an internal pull-up if externally biased) for continuous regulation. Leaving SHDN floating is not recommended - it may cause unpredictable shutdown behavior due to noise coupling. For default-enable operation, a direct connection to IN ensures stable 3.0V output and 82µA quiescent current, with optional logic-controlled shutdown added later if needed.
MAX6475TA30BD3+ 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 (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)
MAX6475TA30BD3+ FAQ
1.How can I place an order for MAX6475TA30BD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6475TA30BD3+ 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 MAX6475TA30BD3+ reliable?
The price and inventory of MAX6475TA30BD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6475TA30BD3+ is usually 5 days.
3.What payment methods are accepted for MAX6475TA30BD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6475TA30BD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6475TA30BD3+?
MAX6475TA30BD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6475TA30BD3+ 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 MAX6475TA30BD3+?
For technical support, including MAX6475TA30BD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6475TA30BD3+ requirements.
6.How does Aetrix verify that MAX6475TA30BD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6475TA30BD3+ 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 MAX6475TA30BD3+ meets industry standards.
7.What is the process for return or replacement of MAX6475TA30BD3+?
All MAX6475TA30BD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6475TA30BD3+, 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 MAX6475TA30BD3+ part is unused and in its original packaging.
Return procedure for MAX6475TA30BD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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