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Analog Devices Inc./Maxim Integrated MAX6473UT25AD1
- Part No.:
- MAX6473UT25AD1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6473UT25AD1.pdf
- Description:
- IC REG LINEAR LDO WITH MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:836
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Product details
Overview
MAX6473UT25AD1 from Maxim Integrated is a 2.5V fixed-output, 300mA low-dropout linear regulator with integrated microprocessor reset circuit, 82µA quiescent current, ±2.0% output voltage accuracy over -40°C to +85°C, and 2.5ms reset timeout. It serves as a power-and-supervision solution for battery-powered microprocessor subsystems in portable instrumentation and wireless modules.
For engineers reviewing the MAX6473UT25AD1 datasheet, MAX6473UT25AD1 pinout, MAX6473UT25AD1 application, or MAX6473UT25AD1 equivalent, this device delivers verified LDO regulation with active-low manual reset (MR), shutdown control, and guaranteed dropout performance at full load - critical for compact, low-power embedded designs requiring supply stability and deterministic boot sequencing.
Technical Context
The MAX6473UT25AD1 integrates a precision bandgap-referenced LDO core and a dedicated reset supervisor sharing the same reference. Its MR input enables external reset assertion while VOUT remains within specification, and RESET remains asserted for the full 2.5ms timeout after MR release. The device uses an internal 40kΩ pullup on MR to VOUT and supports both push-pull and open-drain RESET configurations.
It operates across 2.5V–5.5V input range, delivers 300mA with dropout as low as 55mV at 150mA (VOUT = 3.3V), and features reverse current protection (0.01µA OUT→IN leakage), thermal shutdown at +180°C, and short-circuit current limiting to 450mA. Shutdown reduces supply current to 0.1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2.0% over -40°C to +85°C - ensures stable core logic supply under temperature variation. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-tier microcontrollers and RF transceivers without external boost. |
| Quiescent Current | 82µA typical - extends battery life in always-on sensor nodes and standby modes. |
| Dropout Voltage | 55mV at 150mA (VOUT = 2.5V) - enables operation down to VIN = 2.555V, preserving runtime near battery end-of-discharge. |
| Reset Timeout | 2.5ms minimum - meets minimum processor reset hold time requirements for ARM Cortex-M and similar MCUs. |
| Reset Threshold | -7.5% of nominal VOUT (2.313V) - triggers reset before microprocessor supply tolerance violation occurs. |
| Shutdown Current | 0.1µA typical - eliminates parasitic drain during deep sleep or storage. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion, 2–3 alkaline, or USB-powered systems. |
Pinout & Package
MAX6473UT25AD1 is housed in a 6-pin SOT23 package (3.0mm × 1.7mm × 1.3mm height), with exposed paddle thermally connected to GND. Pin 1 is IN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is RESET; Pin 5 is MR; Pin 6 is OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input | Accepts 2.5V–5.5V supply; requires 0.1µF bypass to GND for stability. |
| 2 (GND) | Ground and thermal pad | Primary return path and heatsink; must be soldered to large PCB ground plane. |
| 3 (SHDN) | Active-low shutdown control | Pulling low disables regulator and reduces IQ to 0.1µA; connect to VIN for normal operation. |
| 4 (RESET) | Active-low reset output | Push-pull configuration; asserts low during power-up, brownout, or MR activation for ≥2.5ms. |
| 5 (MR) | Active-low manual reset input | Internal 40kΩ pullup to VOUT; logic-low pulse initiates system reset independent of supply status. |
| 6 (OUT) | Regulated output | Delivers 2.5V/300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset (MR) input | Enables operator- or firmware-triggered reset without disrupting regulated output - essential for field diagnostics and recovery. |
| 2.5ms factory-programmed reset timeout | Guarantees sufficient hold time for microcontroller POR initialization without external timing components. |
| Reverse current protection | 0.01µA max OUT→IN leakage prevents backup capacitor or battery discharge when main supply is removed. |
| Thermal shutdown with hysteresis | Shuts down at +180°C and re-enables only after cooling by 20°C - prevents thermal runaway during sustained overload. |
| Low-noise operation | Not applicable to MAX6473UT25AD1 (UCSP noise specs apply only to MAX6477–MAX6484); SOT23 variant optimized for general-purpose stability. |
| Current limit protection | 450mA min current limit protects against short-circuit faults while maintaining safe SOA during transient overloads. |
Applications
| Handheld Instrumentation | USB Peripheral Power |
|---|---|
Use Scenario: Powering ADCs, sensors, and low-power MCUs in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Primary 2.5V supply and reset supervisor ensuring clean boot after battery insertion or wake-from-sleep. Use Value: 82µA quiescent current extends shelf life; MR pin allows calibration reset without power cycle. |
Use Scenario: Regulating and supervising 2.5V rail for USB-to-serial bridges and HID devices drawing up to 300mA. IC Role / Device Role / Timing Role: LDO + reset generator replacing discrete supervisor + regulator combo on space-constrained USB PCBs. Use Value: 2.5ms RESET guarantees host enumeration compliance; shutdown mode reduces idle consumption below 1µA. |
| Bluetooth Module Supply | PCMCIA Card Regulation |
Use Scenario: Providing stable 2.5V to Bluetooth SoCs (e.g., Nordic nRF52) in wearables and beacons. IC Role / Device Role / Timing Role: Single-chip power management unit delivering regulated voltage and synchronized reset to radio subsystem. Use Value: Dropout <60mV at 150mA maintains operation during Li-ion discharge down to 2.6V; MR supports OTA firmware recovery. |
Use Scenario: Powering PCMCIA Type II cards with legacy 2.5V I/O interfaces and embedded controllers. IC Role / Device Role / Timing Role: Regulator and supervisor meeting JEDEC JESD22-A103 ESD and PCMCIA hot-plug timing requirements. Use Value: Input UVLO at 2.47V prevents erratic behavior during card insertion; RESET deassertion aligns with VCC ramp per spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6474UT25AD2 | Same 2.5V output, but 20ms reset timeout and no MR pin - uses VOUT monitoring only. | Lacks manual reset capability; suitable where only power-fail reset is needed. | Select MAX6474UT25AD2 if MR functionality is unnecessary and longer reset hold time improves system robustness. |
| TPS76325QDBVRQ1 | Automotive-grade 2.5V LDO (300mA) with 120ms reset timeout; no MR input; higher IQ (110µA). | Qualified to AEC-Q100; intended for automotive infotainment and telematics, not portable consumer gear. | Choose TPS76325QDBVRQ1 only for automotive applications requiring extended temperature and qualification compliance. |
Compared with MAX6473UT25AD1, MAX6474UT25AD2 trades manual reset for longer timeout, while TPS76325QDBVRQ1 adds automotive qualification at the cost of higher quiescent current and no MR - making MAX6473UT25AD1 optimal for portable, user-recoverable systems needing precise 2.5ms timing and field-serviceable reset.
Availability
MAX6473UT25AD1 is available at Aetrix Electronics and suitable for handheld instrumentation, USB peripheral design, and Bluetooth module development requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MAX6473UT25AD1 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 interface applications in demanding environments.
The MAX6469–MAX6484 family was engineered specifically for battery-powered portable electronics requiring tightly integrated regulation and supervision - minimizing board area while guaranteeing reliable power-up sequencing and fault recovery.
FAQ
What is the exact reset threshold voltage for MAX6473UT25AD1?
The MAX6473UT25AD1 uses a -7.5% reset threshold relative to its nominal 2.5V output, resulting in a trip point of 2.313V (2.5V × 0.925). This threshold is guaranteed over -40°C to +85°C and ensures reset assertion before microprocessor supply tolerance limits are violated. The MAX6473UT25AD1 implements this using the same precision bandgap reference as the LDO core, eliminating drift-related false resets.
Does MAX6473UT25AD1 support adjustable output voltage?
No, MAX6473UT25AD1 is a fixed 2.5V output device. It belongs to the MAX6473/MAX6474 subgroup, which lacks the SET pin used for adjustable operation - instead, it features MR (manual reset) on Pin 5. Adjustable variants like MAX6469/MAX6470 use SET (Pin 5) and omit MR. The MAX6473UT25AD1's output is factory-trimmed and cannot be modified externally.
What package type and dimensions does MAX6473UT25AD1 use?
MAX6473UT25AD1 is supplied in a 6-pin SOT23 package measuring 3.0mm × 1.7mm × 1.3mm (height), with Pin 1 marked by a dot. The exposed thermal paddle is internally connected to GND and must be soldered to a PCB ground plane for thermal performance. This package is distinct from the UCSP (used in MAX6477–MAX6484) and TDFN (used in TA-suffixed variants) offerings.
Can MAX6473UT25AD1 be used with input voltages below 2.5V?
No - the absolute minimum input voltage for MAX6473UT25AD1 is 2.5V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V risks undervoltage lockout activation (VUVLO = 2.47V typ) and unstable regulation. For sub-2.5V inputs, consider alternative regulators such as the MAX1725 or TPS780xx series designed for lower VIN ranges.
How does the MR pin function during normal operation of MAX6473UT25AD1?
During normal operation, the MR pin of MAX6473UT25AD1 is internally pulled up to VOUT via a 40kΩ resistor. It remains inactive unless driven low externally (e.g., by a switch or GPIO). When pulled low, MR immediately asserts RESET and holds it for the full 2.5ms timeout after MR returns high. If unused, MR may be left floating or tied to VOUT - no external pullup is required due to the internal one.
MAX6473UT25AD1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- 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 (2.5V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.25V @ 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:
- SOT-23-6
MAX6473UT25AD1 FAQ
1.How can I place an order for MAX6473UT25AD1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6473UT25AD1 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 MAX6473UT25AD1 reliable?
The price and inventory of MAX6473UT25AD1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6473UT25AD1 is usually 5 days.
3.What payment methods are accepted for MAX6473UT25AD1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6473UT25AD1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6473UT25AD1?
MAX6473UT25AD1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6473UT25AD1 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 MAX6473UT25AD1?
For technical support, including MAX6473UT25AD1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6473UT25AD1 requirements.
6.How does Aetrix verify that MAX6473UT25AD1 is sourced from the original manufacturer or authorized distributors?
All MAX6473UT25AD1 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 MAX6473UT25AD1 meets industry standards.
7.What is the process for return or replacement of MAX6473UT25AD1?
All MAX6473UT25AD1 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6473UT25AD1, 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 MAX6473UT25AD1 part is unused and in its original packaging.
Return procedure for MAX6473UT25AD1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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