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Analog Devices Inc./Maxim Integrated MAX6475TA28AD3+
- Part No.:
- MAX6475TA28AD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6475TA28AD3+.pdf
- Description:
- FIXED/ADJUSTABLE POSITIVE LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,767
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Product details
Overview
MAX6475TA28AD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.8V output, -7.5% reset threshold, and 150ms minimum reset timeout. It features active-low push-pull RESET, shutdown control (0.1µA standby), remote feedback (FB) for external NPN pass transistor support, and operates from 2.5V to 5.5V input across -40°C to +85°C. Designed for battery-powered portable systems requiring precise voltage regulation and reliable power-on reset.
For engineers reviewing the MAX6475TA28AD3+ datasheet, MAX6475TA28AD3+ pinout, MAX6475TA28AD3+ application, or MAX6475TA28AD3+ equivalent, this page delivers verified technical context, exact package mapping (8-pin TDFN-EP), validated pin functions (IN/GND/SHDN/RESET/FB/OUT), confirmed reset timing (150ms), and real-world selection guidance against comparable LDO+reset ICs - all derived from Maxim's official documentation and electrical specifications.
Technical Context
The MAX6475TA28AD3+ integrates a precision LDO regulator core with a dedicated reset supervisor sharing the same internal reference. Its FB pin is electrically isolated from OUT, enabling true remote sensing at the load or driving an external NPN transistor for current boosting up to 300mA × β(min). The reset circuit asserts active-low RESET when VFB drops below 92.5% of nominal (–7.5% tolerance), with guaranteed 35µs response delay and 150ms minimum timeout.
It employs thermal shutdown (180°C trip, 20°C hysteresis), reverse current protection (0.01µA OUT→IN leakage), and short-circuit current limiting (450mA min). Supply current is 82µA typical at no load and rises to 96µA at 300mA load; shutdown reduces it to 0.1µA. Dropout is 137mV at 300mA for VOUT = 2.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2.7% over –40°C to +85°C - ensures stable core logic supply for 2.8V I/O domains. |
| Max Output Current | 300mA guaranteed - sufficient to power microcontrollers, sensors, and RF modules without external boost. |
| Dropout Voltage | 137mV at 300mA (VOUT = 2.8V) - enables operation down to VIN = 2.937V, critical for single-cell Li-ion or alkaline systems. |
| Reset Threshold | –7.5% of VOUT (i.e., 2.61V for 2.8V output) - meets standard µP supply tolerance requirements before asserting RESET. |
| Reset Timeout | 150ms minimum - provides adequate stabilization time for clock oscillators and memory initialization before processor release. |
| Supply Current | 82µA typical (no load), 0.1µA in shutdown - extends battery life in sleep-mode portable devices. |
| Remote Sense | FB pin independent of OUT - supports remote voltage regulation at point-of-load or high-current NPN-based configurations. |
Pinout & Package
MAX6475TA28AD3+ is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) with exposed paddle (EP) internally connected to GND. Thermal performance is optimized by soldering EP to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator Input | Accepts 2.5V–5.5V input; bypass to GND with 0.1µF ceramic capacitor for stability. |
| 2 (GND) | Ground / Thermal Pad | Primary return path and thermal dissipation node; 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 configuration; drives µP reset input directly; asserts when FB < 92.5% VOUT. |
| 5 (FB) | Feedback / Remote Sense Input | Connects to load VCC for remote sensing or external NPN base; not internally tied to OUT. |
| 6 (OUT) | Regulator Output | Delivers regulated 2.8V; requires ≥3.3µF low-ESR output capacitor at device pins. |
| 7–8 (EP) | Exposed Paddle | Internally connected to GND; mandatory thermal connection to PCB ground for safe 300mA operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated µP Reset Supervisor | Eliminates need for discrete supervisor IC; guarantees reset assertion during brownout, startup, and shutdown. |
| Remote Feedback (FB) Pin | Enables point-of-load regulation or external NPN transistor current boosting - supports >300mA total load with proper transistor selection. |
| Low Quiescent Current | 82µA operating / 0.1µA shutdown - preserves battery capacity in always-on or intermittently active portable systems. |
| Reverse Current Protection | 0.01µA max OUT→IN leakage - prevents backup capacitors or batteries from back-feeding into depleted input sources. |
| Thermal & Short-Circuit Protection | 180°C shutdown with 20°C hysteresis and 450mA current limit - ensures robustness under fault conditions without external components. |
Applications
| Handheld Medical Devices | USB-Powered IoT Sensors |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single-cell lithium batteries with strict low-power sleep requirements. IC Role / Device Role: Primary 2.8V power rail generator and system reset controller ensuring clean boot after battery insertion or wake-up. Use Value: 0.1µA shutdown current extends shelf life; 150ms reset timeout guarantees ADC reference and sensor bias circuits stabilize before measurement. |
Use Scenario: Battery-operated environmental sensors (temp/humidity/CO₂) communicating via USB-C or USB 2.0 host interfaces. IC Role / Device Role: Supplies stable 2.8V to MCU and analog front-end while providing hardware reset synchronized to VBUS presence detection. Use Value: FB pin allows remote sensing at USB connector side to compensate for PCB trace IR drop; low dropout enables operation down to 2.937V input. |
| Industrial Hand Scanners | Bluetooth LE Audio Accessories |
Use Scenario: Rugged barcode scanners using replaceable AA/AAA alkaline packs with wide input voltage swing (4.5V–1.0V per cell). IC Role / Device Role: Regulates 2.8V for imaging sensor and decode engine; SHDN controlled by host MCU to gate power during idle periods. Use Value: 137mV dropout at 300mA ensures full functionality until battery reaches ~2.94V; reverse leakage protection prevents partial discharge of unused cells. |
Use Scenario: True wireless stereo earbuds with compact Li-po cells and tight thermal constraints inside earpiece housing. IC Role / Device Role: Powers Bluetooth SoC and DAC at 2.8V; RESET signal coordinates firmware initialization with crystal oscillator stabilization. Use Value: 82µA quiescent current minimizes standby drain; TDFN-EP package (3×3mm) fits space-constrained layouts while EP improves thermal margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76328QDBVRQ1 | 200mA output, no integrated reset, requires external supervisor; 120mV dropout at 150mA. | Lacks reset function - adds BOM cost and board area; suitable only if reset is handled elsewhere. | Choose only if system already includes a separate reset IC and 200mA load is sufficient. |
| ADM6315-28ARTZ-RL7 | Standalone reset IC (no LDO); 2.8V threshold, 200ms timeout; consumes 0.9µA. | Requires companion LDO (e.g., ADM7172); increases component count and design complexity. | Select when existing LDO lacks reset and board space allows two ICs; not a functional replacement. |
Compared with MAX6475TA28AD3+, TPS76328QDBVRQ1 offers lower dropout but no reset integration, increasing system-level validation effort; ADM6315-28ARTZ-RL7 provides longer timeout and tighter threshold accuracy but forces dual-IC implementation - neither matches the single-chip, 300mA, remote-sense, and 150ms reset capability of MAX6475TA28AD3+.
Availability
MAX6475TA28AD3+ is available at Aetrix Electronics and suitable for handheld medical devices, USB-powered IoT sensors, industrial hand scanners, Bluetooth LE audio accessories, and battery-backed data loggers requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX6475TA28AD3+ 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 family was engineered specifically for space- and power-constrained portable electronics needing combined LDO regulation and microprocessor reset in one die - targeting battery-powered instrumentation, communications, and computing applications.
FAQ
What is the exact output voltage and tolerance of MAX6475TA28AD3+?
The MAX6475TA28AD3+ provides a factory-trimmed fixed output voltage of 2.8V with ±2.7% accuracy over the full –40°C to +85°C temperature range and 1mA–300mA load current. This specification is guaranteed in production testing and documented in Maxim's Electrical Characteristics table for MAX6475 devices.
Does MAX6475TA28AD3+ support remote voltage sensing, and how is it implemented?
Yes, MAX6475TA28AD3+ supports remote sensing via its dedicated FB pin, which is electrically isolated from the OUT pin. To implement remote sensing, connect FB directly to the load's VCC node - not to the regulator's OUT pin - allowing regulation at the point of load. This compensates for PCB trace resistance and ensures accurate 2.8V delivery under varying current conditions.
What is the reset timeout period for MAX6475TA28AD3+, and is it configurable?
The MAX6475TA28AD3+ has a fixed reset timeout period of 150ms (minimum), indicated by the "D3" suffix in the part number. This value is factory-set and not user-configurable; alternative timeouts (2.5ms, 20ms, 1200ms) require different orderable variants such as MAX6475TA28AD1+, MAX6475TA28AD2+, or MAX6475TA28AD4+.
Can MAX6475TA28AD3+ drive higher than 300mA loads, and if so, how?
Yes, MAX6475TA28AD3+ can support higher output currents using its FB pin to control an external NPN transistor in series with the load. The total current becomes IOUT(TOTAL) = IOUT × (β + 1), where β is the transistor's minimum DC current gain. The datasheet specifies this configuration and requires careful selection of the NPN device for power dissipation and current rating.
What package type and thermal considerations apply to MAX6475TA28AD3+?
MAX6475TA28AD3+ uses an 8-pin TDFN-EP package (3mm × 3mm) with exposed paddle (EP) internally connected to GND. For reliable 300mA operation, the EP must be soldered to a PCB ground plane with adequate copper area. Thermal derating is 24.4mW/°C above +70°C, and maximum continuous power dissipation is 1951mW at +70°C ambient.
MAX6475TA28AD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V (2.8V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.21V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 136 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset
- 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-EP (3x3)
MAX6475TA28AD3+ FAQ
1.How can I place an order for MAX6475TA28AD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6475TA28AD3+ 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 MAX6475TA28AD3+ reliable?
The price and inventory of MAX6475TA28AD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6475TA28AD3+ is usually 5 days.
3.What payment methods are accepted for MAX6475TA28AD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6475TA28AD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6475TA28AD3+?
MAX6475TA28AD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6475TA28AD3+ 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 MAX6475TA28AD3+?
For technical support, including MAX6475TA28AD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6475TA28AD3+ requirements.
6.How does Aetrix verify that MAX6475TA28AD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6475TA28AD3+ 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 MAX6475TA28AD3+ meets industry standards.
7.What is the process for return or replacement of MAX6475TA28AD3+?
All MAX6475TA28AD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6475TA28AD3+, 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 MAX6475TA28AD3+ part is unused and in its original packaging.
Return procedure for MAX6475TA28AD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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