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Analog Devices Inc./Maxim Integrated MAX6475TA33AD3+
- Part No.:
- MAX6475TA33AD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6475TA33AD3+.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,067
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Product details
Overview
MAX6475TA33AD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 3.3V output, ±2.0% accuracy over -40°C to +85°C, 114mV dropout at 300mA load, and active-low open-drain RESET with 150ms timeout. It features SHDN input for 0.1µA shutdown current and FB pin for remote voltage sensing in high-current NPN-based applications.
For engineers reviewing the MAX6475TA33AD3+ datasheet, MAX6475TA33AD3+ pinout, MAX6475TA33AD3+ application, or MAX6475TA33AD3+ equivalent, key selection considerations include its 3.3V fixed output with remote sense capability, 150ms reset timeout, 82µA quiescent current, thermal/short-circuit protection, and compatibility with battery-powered portable systems requiring regulated supply and reliable power-on reset sequencing.
Technical Context
The MAX6475TA33AD3+ integrates a precision LDO regulator core with a dedicated reset supervisor sharing the same reference. Its FB pin connects directly to the external load (e.g., microprocessor VCC) rather than internally to OUT, enabling true remote sensing for improved regulation under PCB trace IR drop.
This variant belongs to the MAX6475/MAX6476/MAX6483/MAX6484 subgroup featuring remote feedback - distinct from SET-based adjustable models - and uses the "A" reset threshold (90–92.5% of nominal VOUT), D3 timeout (150ms min), and TDFN-EP 8-pin package with exposed paddle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.0% over full temperature range - ensures stable core logic supply for 3.3V microcontrollers without external resistor network. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-complexity embedded processors and peripherals directly. |
| Dropout Voltage | 114mV at 300mA - enables operation from 3.414V input, critical for single-cell Li-ion or 3× alkaline battery systems. |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring or sleep-mode applications. |
| Reset Timeout | 150ms minimum - meets standard microprocessor reset hold-time requirements for safe initialization. |
| Reset Threshold | 90–92.5% of VOUT (−7.5% tolerance) - asserts RESET before supply falls below −7.5%, preventing erratic µP behavior. |
| Shutdown Current | 0.1µA typical - reduces system standby power to negligible levels during deep-sleep states. |
| Input Voltage Range | 2.5V to 5.5V - supports wide battery chemistries including Li-ion, Li-Po, and multi-cell alkaline/NiMH. |
Pinout & Package
MAX6475TA33AD3+ 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 effective thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input | Accepts 2.5–5.5V supply; requires 0.1µF bypass capacitor to GND for stability. |
| 2 (GND) | Ground reference & thermal path | Electrical return and primary heat 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 open-drain reset output | Asserts low when VFB < 90–92.5% of 3.3V or during startup; requires external pullup for µP reset line. |
| 5 (FB) | Remote feedback sense input | Connects directly to load VCC point (not OUT); enables precise regulation despite PCB trace resistance. |
| 6 (OUT) | Regulator output | Delivers up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response. |
| 7,8 (NC) | No-connect | Not internally bonded; left unconnected per datasheet. |
| EP | Exposed thermal pad | Internally connected to GND; must be soldered to PCB ground plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Remote feedback (FB) pin | Enables direct connection to processor VCC rail, compensating for PCB trace voltage drop and ensuring accurate 3.3V delivery at load. |
| 150ms reset timeout (D3) | Guarantees µP reset assertion long enough for clock stabilization and internal state initialization before release. |
| −7.5% reset threshold (A suffix) | Provides tighter supply monitoring than −12.5% variants, reducing risk of marginal operation during brownout conditions. |
| Thermal shutdown with 20°C hysteresis | Protects against sustained overload by cycling regulator on/off until junction cools, preventing permanent damage. |
| Reverse current protection (0.01µA typ) | Blocks backfeed from OUT to IN when battery is removed, preserving backup sources and preventing unintended charging. |
| 8-pin TDFN-EP package | Offers 41°C/W junction-to-case thermal resistance and compact 3×3mm footprint ideal for space-constrained portable designs. |
Applications
| Handheld Medical Sensors | USB-C Powered Peripherals |
|---|---|
|
Use Scenario: Portable pulse oximeter powered by single-cell Li-ion battery with Bluetooth LE transmission. IC Role / Device Role / Timing Role: Provides clean, regulated 3.3V supply to MCU and analog front-end while asserting RESET until voltage stabilizes post-battery insertion. Use Value: Remote FB sensing maintains 3.3V at sensor IC pins despite 100mΩ PCB trace resistance; 150ms RESET ensures reliable BLE stack initialization. |
Use Scenario: USB-C dock accessory drawing power from 5V PD source, powering FPGA I/O banks and USB transceivers. IC Role / Device Role / Timing Role: Regulates 5V USB-C input to stable 3.3V; RESET signals FPGA configuration controller only after supply reaches valid level. Use Value: 114mV dropout allows full 300mA delivery even as USB-C input sags to 3.414V; open-drain RESET interfaces cleanly with FPGA reset pin. |
| Industrial Wireless Sensor Nodes | Smart Energy Meters |
|
Use Scenario: LoRaWAN node powered by AA batteries with 10-year lifetime target and cold-temperature operation. IC Role / Device Role / Timing Role: Supplies 3.3V to ultra-low-power MCU and RF transceiver; SHDN enables µA-level sleep current between transmissions. Use Value: 82µA quiescent current minimizes battery drain in sleep mode; −40°C to +85°C rating ensures reliability in outdoor enclosures. |
Use Scenario: Electricity meter with backup supercapacitor maintaining RTC and memory during AC mains failure. IC Role / Device Role / Timing Role: Regulates main supply to 3.3V; RESET asserts when AC fails, triggering switchover to backup power and safe shutdown sequence. Use Value: Reverse current protection prevents supercapacitor discharge into dead input; RESET timing aligns with meter firmware watchdog requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6475TA33AD2+ | Same 3.3V output and FB pin, but 20ms reset timeout (D2 suffix) instead of 150ms. | Suitable for fast-boot µPs where shorter reset hold time is acceptable. | Select MAX6475TA33AD2+ only if system boot sequence completes within 20ms; otherwise MAX6475TA33AD3+ ensures robust initialization. |
| TPS7A0533PDBVR | 3.3V LDO with 25µA IQ and no integrated reset or FB pin; requires external supervisor IC. | Lacks reset functionality and remote sensing - demands additional components and board area. | Choose only if cost sensitivity outweighs integration benefits and external reset timing can be precisely controlled. |
Compared with MAX6475TA33AD2+, the MAX6475TA33AD3+ provides longer reset assertion for safer µP startup; versus TPS7A0533PDBVR, it delivers full power-supply supervision in one die, reducing BOM count and layout complexity while enabling remote-sense accuracy.
Availability
MAX6475TA33AD3+ is available at Aetrix Electronics and suitable for handheld medical sensors, USB-C powered peripherals, industrial wireless sensor nodes, and smart energy meters requiring stable component supply with full lifecycle support.
Supply support for MAX6475TA33AD3+ 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 demanding industrial, automotive, and communications applications.
The MAX6469–MAX6484 product line was designed specifically for battery-powered portable equipment needing tightly regulated voltage, ultra-low quiescent current, and integrated power-on reset - eliminating external supervisors and simplifying power architecture.
FAQ
What is the function of the FB pin on the MAX6475TA33AD3+?
The FB pin on the MAX6475TA33AD3+ serves as a remote feedback input, allowing direct connection to the load's VCC point (e.g., microprocessor power rail) instead of the regulator's OUT pin. This compensates for voltage drop across PCB traces or connectors, ensuring the regulated 3.3V is maintained precisely at the load. Unlike SET-based variants, FB is not internally tied to OUT and requires no external resistors for fixed-output operation.
Does the MAX6475TA33AD3+ support manual reset functionality?
No, the MAX6475TA33AD3+ does not include a manual reset (MR) input. It belongs to the MAX6475/MAX6476/MAX6483/MAX6484 subgroup, which features FB for remote sensing but omits MR. Manual reset capability is present only in MAX6471–MAX6474 and MAX6479–MAX6482 variants. For systems requiring operator-initiated reset, an external pushbutton circuit driving the SHDN pin or a separate supervisor IC would be needed.
What is the maximum input voltage the MAX6475TA33AD3+ can tolerate?
The MAX6475TA33AD3+ has an absolute maximum input voltage rating of +7V on the IN pin, but its functional operating range is specified from 2.5V to 5.5V. Operation above 5.5V risks exceeding internal device limits and is not guaranteed. For 12V or higher input rails, a pre-regulator stage or alternative high-input-voltage LDO must be used upstream of the MAX6475TA33AD3+.
How does the MAX6475TA33AD3+ handle reverse current flow from OUT to IN?
The MAX6475TA33AD3+ incorporates reverse current protection that limits OUT-to-IN leakage to 0.01µA typical when VOUT > VIN. This prevents backfeeding into a disconnected or depleted battery source. During such conditions, RESET remains asserted until VIN exceeds VOUT and the output rises above the 90–92.5% reset threshold, ensuring system integrity during power transitions.
Can the MAX6475TA33AD3+ be used with an external NPN transistor to increase output current?
Yes, the MAX6475TA33AD3+ is explicitly designed for use with an external NPN pass transistor via its FB pin. By connecting FB to the emitter of the NPN and routing the collector to IN, the regulator controls base drive to deliver higher total current (IOUT × β). The datasheet provides design equations and transistor selection criteria - including minimum beta, power dissipation, and collector current - to ensure stable, protected operation beyond 300mA.
MAX6475TA33AD3+ 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 (3.3V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.18V @ 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)
MAX6475TA33AD3+ FAQ
1.How can I place an order for MAX6475TA33AD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6475TA33AD3+ 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 MAX6475TA33AD3+ reliable?
The price and inventory of MAX6475TA33AD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6475TA33AD3+ is usually 5 days.
3.What payment methods are accepted for MAX6475TA33AD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6475TA33AD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6475TA33AD3+?
MAX6475TA33AD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6475TA33AD3+ 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 MAX6475TA33AD3+?
For technical support, including MAX6475TA33AD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6475TA33AD3+ requirements.
6.How does Aetrix verify that MAX6475TA33AD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6475TA33AD3+ 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 MAX6475TA33AD3+ meets industry standards.
7.What is the process for return or replacement of MAX6475TA33AD3+?
All MAX6475TA33AD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6475TA33AD3+, 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 MAX6475TA33AD3+ part is unused and in its original packaging.
Return procedure for MAX6475TA33AD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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