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Analog Devices Inc./Maxim Integrated MAX6473TA28BD3+
- Part No.:
- MAX6473TA28BD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6473TA28BD3+.pdf
- Description:
- IC REG LINEAR LDO 300MA
- Quantity:
- Payment:
- Shipping:
Inventory:2,104
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Product details
Overview
MAX6473TA28BD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.8V output, -12.5% reset threshold, and 150ms minimum reset timeout. It features 82µA quiescent current, 137mV dropout at 300mA (VOUT = 2.8V), and active-low push-pull RESET output. Designed for battery-powered portable electronics requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6473TA28BD3+ datasheet, MAX6473TA28BD3+ pinout, MAX6473TA28BD3+ application, or MAX6473TA28BD3+ equivalent, key selection criteria include its shutdown capability (0.1µA ISHDN), thermal/short-circuit protection, ±2.0% output accuracy over -40°C to +85°C, and compatibility with 3.3µF low-ESR output capacitors in space-constrained designs.
Technical Context
The MAX6473TA28BD3+ integrates a precision LDO regulator core and a fully self-contained reset supervisor sharing the same voltage reference. Its regulator operates from 2.5V to 5.5V input, delivering stable 2.8V at up to 300mA with dropout as low as 137mV at full load. The reset circuit monitors VOUT against a -12.5% threshold and asserts an active-low RESET signal for ≥150ms after recovery.
This device belongs to the MAX6473–MAX6474 variant group, featuring SHDN (pin 3) for ultra-low-power shutdown and RESET (pin 4) in push-pull configuration - no manual reset (MR) or remote sense (FB) pins. It uses internal preset feedback, eliminating external resistors for fixed 2.8V operation while maintaining 75µVRMS output noise (typ) and 0.2% load regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2.0% over -40°C to +85°C - ensures stable core logic supply for microcontrollers and RF ICs without external trimming. |
| Max Output Current | 300mA guaranteed - sufficient to power ARM Cortex-M series MCUs, Bluetooth SoCs, or sensor hubs directly. |
| Dropout Voltage | 137mV at 300mA (VOUT = 2.8V) - enables operation down to 2.937V input, critical for single-cell Li-ion or 3-cell alkaline systems near end-of-life. |
| Quiescent Current | 82µA typical - extends battery life in always-on wake-up circuits (e.g., BLE beacon standby). |
| Reset Threshold | -12.5% of 2.8V = 2.45V (min assertion) - provides conservative margin against processor brownout during transient load spikes. |
| Reset Timeout | 150ms minimum - meets JEDEC JESD78 requirement for microprocessor initialization stability after power recovery. |
| Shutdown Current | 0.1µA typical - reduces system standby power to nanoampere levels when host MCU disables power rail. |
Pinout & Package
MAX6473TA28BD3+ is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) package with exposed paddle (EP) internally connected to GND for thermal management. Pin 1 = IN, Pin 2 = GND, Pin 3 = SHDN, Pin 4 = RESET, Pin 5 = SET, Pin 6 = OUT. EP must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Regulator input supply | Bypass with 0.1µF ceramic capacitor to GND; accepts 2.5V–5.5V input for 2.8V output. |
| GND (Pin 2) | Power and thermal reference | Primary ground return path; also serves as heatsink - must connect to large copper area for thermal dissipation. |
| SHDN (Pin 3) | Active-low shutdown control | Pull low to disable regulator and reduce supply current to 0.1µA; tie to IN for normal operation. |
| RESET (Pin 4) | Active-low push-pull reset output | Drives µP reset pin directly; asserts low during power-up, brownout, or SHDN activation; holds for ≥150ms post-recovery. |
| SET (Pin 5) | Feedback configuration selector | Connected to GND internally for fixed 2.8V mode; open or floating not allowed - must be grounded per design. |
| OUT (Pin 6) | Regulated 2.8V output | Requires ≥3.3µF low-ESR ceramic capacitor to GND; delivers up to 300mA with <0.2% load regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated microprocessor reset | Eliminates need for discrete supervisor IC - saves board space and BOM count while ensuring synchronized power-good signaling. |
| Ultra-low shutdown current | 0.1µA typ enables >10-year battery life in IoT endpoint sleep modes (e.g., smart meter backup rails). |
| Thermal and short-circuit protection | Auto-shutdown at 180°C junction temperature with 20°C hysteresis - prevents field failure under sustained overload or poor heatsinking. |
| Reverse current blocking | 0.01µA max OUT-to-IN leakage - prevents backfeeding into depleted batteries during hot-swap or backup power transitions. |
| Low-noise LDO output | 75µVRMS (10Hz–100kHz) - supports noise-sensitive analog peripherals (ADCs, RF transceivers) without additional filtering. |
Applications
| Handheld Medical Devices | USB-C Peripheral Power |
|---|---|
Use Scenario: Portable blood glucose meters powered by single AAA alkaline cells with dynamic load switching between sensor biasing and LCD backlight. IC Role / Device Role / Timing Role: Primary 2.8V power rail generator and system reset sequencer during battery insertion and low-voltage brownout events. Use Value: 137mV dropout sustains operation until cell voltage drops to 2.937V; 150ms reset timeout guarantees ADC calibration completes before µP executes firmware. |
Use Scenario: USB-C audio dongles drawing burst current up to 250mA from 5V VBUS while maintaining clean 2.8V codec supply. IC Role / Device Role / Timing Role: Local LDO regulator with integrated reset to decouple codec power from noisy USB VBUS and enforce safe startup timing. Use Value: 82µA quiescent current minimizes standby drain; 75µVRMS noise prevents audible artifacts in headphone output. |
| Industrial Wireless Sensors | Bluetooth Low Energy Modules |
Use Scenario: Battery-operated LoRaWAN node using CR2032 coin cell, waking every 5 minutes to transmit sensor data via SX1276 transceiver. IC Role / Device Role / Timing Role: Main 2.8V supply for MCU and radio, with SHDN controlled by RTC alarm to gate power during deep sleep. Use Value: 0.1µA shutdown current extends CR2032 lifetime beyond 5 years; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Use Scenario: Compact BLE beacon (e.g., nRF52832-based) powered by button cell, requiring precise 2.8V for RF PA and digital core. IC Role / Device Role / Timing Role: Single-chip power solution providing regulated voltage and deterministic reset assertion during cold start and voltage sag. Use Value: ±2.0% output accuracy ensures consistent RF output power across temperature; push-pull RESET drives nRF52's RESETN pin without pull-up resistor. |
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 200mA. | Lacks built-in reset - adds component count and layout complexity for automotive-grade designs needing ASIL-B compliance. | Select only if reset functionality is implemented elsewhere and 100mA lower current suffices. |
| ADP162AUJZ-2.8-R7 | 150mA output, no reset, 135mV dropout at 150mA; 2.5µA quiescent current (no shutdown). | Higher IQ and no shutdown limit battery life in ultra-low-power applications; reset must be added externally. | Preferable only for cost-sensitive, non-battery applications where 150mA load and no sequencing are acceptable. |
Compared with TPS76328QDBVRQ1 and ADP162AUJZ-2.8-R7, MAX6473TA28BD3+ uniquely combines 300mA drive, integrated 150ms reset, 0.1µA shutdown, and 2.8V accuracy in one 3×3mm package - reducing total solution size by 40% and eliminating timing mismatch risks between discrete LDO and supervisor.
Availability
MAX6473TA28BD3+ is available at Aetrix Electronics and suitable for handheld medical devices, USB-C peripherals, industrial wireless sensors, and Bluetooth Low Energy modules requiring stable component supply with long-term lifecycle support.
Supply support for MAX6473TA28BD3+ 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 high-performance analog and mixed-signal ICs for power management, sensing, and communication applications.
The MAX6469–MAX6484 product line targets battery-powered portable equipment requiring integrated power regulation and microprocessor supervision in minimal footprint - emphasizing ultra-low IQ, robust protection, and guaranteed reset timing.
FAQ
What is the exact output voltage tolerance and temperature range for MAX6473TA28BD3+?
The MAX6473TA28BD3+ delivers a fixed 2.8V output with ±2.0% accuracy over the full operating temperature range of -40°C to +85°C. This specification is guaranteed across 1mA to 300mA load current and 2.5V to 5.5V input voltage, making it suitable for precision applications like sensor signal chains and RF biasing where voltage drift must remain within tight bounds.
Does MAX6473TA28BD3+ support adjustable output voltage via the SET pin?
No, MAX6473TA28BD3+ operates exclusively in fixed-output mode. Its SET pin is internally connected to GND to configure the 2.8V preset; it must be externally tied to GND per the datasheet. Unlike MAX6469–MAX6472 variants, this part does not support external resistor-divider adjustment - the 2.8V output is factory-trimmed and unchangeable.
What is the function of the SHDN pin on MAX6473TA28BD3+, and what voltage levels activate it?
The SHDN pin on MAX6473TA28BD3+ is an active-low digital control input that disables the regulator core when pulled below 0.3×VIN. When asserted, it reduces total supply current to 0.1µA (typ), placing the device in ultra-low-power state. For normal operation, SHDN must be tied to VIN or driven high - floating SHDN is not permitted and may cause undefined behavior.
Can MAX6473TA28BD3+ be used with ceramic output capacitors, and what is the minimum required value?
Yes, MAX6473TA28BD3+ is optimized for ceramic output capacitors. The datasheet specifies a minimum of 3.3µF with low ESR (≤50mΩ) placed directly at the OUT pin. Using X5R/X7R 0805 or 0603 ceramics meets stability requirements across temperature and load, enabling compact layout without tantalum or electrolytic alternatives.
How does the reset timeout period of 150ms (D3 suffix) impact system startup timing?
The D3 suffix on MAX6473TA28BD3+ configures a guaranteed minimum 150ms reset timeout, meaning the active-low RESET signal remains asserted for at least 150ms after VOUT rises above 2.45V (2.8V × 87.5%). This ensures microprocessors and memory devices complete internal initialization before release - meeting JEDEC JESD78 reliability requirements for power-on reset integrity.
MAX6473TA28BD3+ 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):
- 5V
- Voltage Dropout (Max):
- 0.21V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 136 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Manual Reset, 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 (3x3)
MAX6473TA28BD3+ FAQ
1.How can I place an order for MAX6473TA28BD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6473TA28BD3+ 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 MAX6473TA28BD3+ reliable?
The price and inventory of MAX6473TA28BD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6473TA28BD3+ is usually 5 days.
3.What payment methods are accepted for MAX6473TA28BD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6473TA28BD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6473TA28BD3+?
MAX6473TA28BD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6473TA28BD3+ 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 MAX6473TA28BD3+?
For technical support, including MAX6473TA28BD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6473TA28BD3+ requirements.
6.How does Aetrix verify that MAX6473TA28BD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6473TA28BD3+ 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 MAX6473TA28BD3+ meets industry standards.
7.What is the process for return or replacement of MAX6473TA28BD3+?
All MAX6473TA28BD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6473TA28BD3+, 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 MAX6473TA28BD3+ part is unused and in its original packaging.
Return procedure for MAX6473TA28BD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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