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Analog Devices Inc./Maxim Integrated MAX6473TA25AD3+
- Part No.:
- MAX6473TA25AD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6473TA25AD3+.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6473TA25AD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, preset 2.5V output voltage, -7.5% reset threshold, and 150ms (min) active-low push-pull RESET timeout. It delivers ±2.0% output accuracy over -40°C to +85°C, consumes only 82µA quiescent current, and supports shutdown mode (0.1µA). Used in battery-powered portable systems requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6473TA25AD3+ datasheet, MAX6473TA25AD3+ pinout, MAX6473TA25AD3+ application, or MAX6473TA25AD3+ equivalent, key selection criteria include its fixed 2.5V output, SHDN-controlled shutdown, 150ms reset timeout, push-pull RESET configuration, and 8-pin TDFN-EP package with exposed thermal pad - all critical for compact, low-power embedded designs.
Technical Context
The MAX6473TA25AD3+ integrates a precision LDO regulator core with a dedicated reset supervisor sharing the same internal reference. Its regulator operates from 2.5V to 5.5V input, maintains 2.5V output with ≤114mV dropout at 300mA load, and features reverse current protection (0.01µA OUT→IN leakage). The reset circuit monitors VOUT against a -7.5% threshold and asserts RESET for ≥150ms after recovery.
This device belongs to the MAX6473–MAX6474 variant group: it includes active-low SHDN (not MR), push-pull RESET output, and no manual reset input. Pin 3 is SHDN, pin 4 is RESET, and pin 5 is SET (tied to GND for fixed 2.5V operation). It does not support remote sense (FB) or adjustable output - those functions are exclusive to MAX6475/MAX6476 variants.
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 for microcontrollers without external feedback tuning. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-complexity SoCs, RF modules, or sensor subsystems directly. |
| Dropout Voltage | 114mV at 300mA - enables operation down to VIN = 2.614V, extending battery runtime in single-cell Li-ion or 3×alkaline systems. |
| Quiescent Current | 82µA typical - minimizes standby drain in always-on portable devices; drops to 0.1µA in shutdown mode. |
| Reset Threshold | -7.5% of 2.5V = 2.3125V (min assertion point) - aligns with standard µP supply tolerance requirements for clean boot sequencing. |
| Reset Timeout | 150ms minimum - provides adequate stabilization time for clock oscillators and memory before releasing processor reset. |
| Package | 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) with exposed thermal pad - enables high power density and efficient PCB heat dissipation. |
Pinout & Package
MAX6473TA25AD3+ uses an 8-pin TDFN-EP package with exposed paddle (EP), rated for -40°C to +85°C operation. The EP must be soldered to PCB ground plane for thermal management and electrical grounding. Pin 1 is IN, Pin 2 is GND, Pin 3 is SHDN, Pin 4 is RESET, Pin 5 is SET, Pin 6 is OUT, and Pins 7–8 are unused (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input supply | Accepts 2.5V–5.5V input; requires 0.1µF bypass capacitor to GND for stability. |
| 2 (GND) | Power and thermal ground | Primary return path; also serves as heatsink - 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 VIN for normal operation. |
| 4 (RESET) | Active-low push-pull reset output | Asserts low during power-up, brownout, or SHDN activation; remains low ≥150ms after recovery. |
| 5 (SET) | Feedback select input | Tied to GND to enable fixed 2.5V output; left floating or connected externally only in adjustable variants. |
| 6 (OUT) | Regulated output | Delivers 2.5V at up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response. |
| 7–8 (NC) | No-connect terminals | Not internally bonded; must remain unconnected per datasheet guidance. |
| EP | Exposed thermal pad | Internally connected to GND; must be soldered to PCB ground plane for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated microprocessor reset | Eliminates need for external supervisor IC by providing factory-trimmed -7.5% VOUT monitoring and 150ms timeout. |
| Low-quiescent-current shutdown | Reduces system standby current to 0.1µA, enabling multi-year battery life in IoT sensors and wearables. |
| Reverse current protection | 0.01µA typical OUT→IN leakage prevents backup battery discharge when main supply is removed. |
| Thermal and short-circuit protection | Auto-shutdown at +180°C junction temperature with 20°C hysteresis; survives indefinite output short to GND. |
| High-accuracy output regulation | ±2.0% over full temperature range ensures reliable operation of voltage-sensitive peripherals like ADCs and RF transceivers. |
Applications
| Handheld Instruments | PCMCIA/USB Devices |
|---|---|
|
Use Scenario: Powering ARM Cortex-M based data loggers in field-deployed handheld meters with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary 2.5V LDO supplying MCU core and analog front-end; RESET ensures deterministic boot after battery insertion or brownout. Use Value: 114mV dropout extends usable battery range to ~2.61V, while 82µA IQ preserves charge during sleep cycles between measurements. |
Use Scenario: Regulating 2.5V supply for USB 2.0 PHY and controller ICs on compact PCMCIA cards used in industrial laptops. IC Role / Device Role / Timing Role: Local point-of-load regulator with integrated reset to meet USB enumeration timing requirements and prevent firmware lockup. Use Value: 150ms RESET timeout exceeds USB 2.0 specification's 100ms VBUS stabilization window, ensuring robust host detection. |
| Notebook Subsystems | Bluetooth/Wireless LAN Modules |
|
Use Scenario: Providing 2.5V bias to embedded security co-processors or TPM chips in ultrabook designs where space is constrained. IC Role / Device Role / Timing Role: Secondary regulated rail with SHDN controlled by platform controller hub; RESET synchronized to main CPU power sequence. Use Value: TDFN-EP package (3×3mm) fits within tight BGA escape routing zones; exposed pad improves thermal margin under burst workloads. |
Use Scenario: Supplying 2.5V to Bluetooth 5.0 SoC and associated flash memory in compact wireless earbud charging cases. IC Role / Device Role / Timing Role: Always-on LDO maintaining RTC and wake logic; RESET signals valid power to baseband processor on case lid open. Use Value: 0.1µA shutdown current enables >12-month shelf life; -7.5% reset threshold prevents false resets during brief voltage dips during RF transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6473TA25AD2+ | Same 2.5V output and SHDN function, but 20ms reset timeout instead of 150ms. | Suitable for faster-boot systems (e.g., simple microcontrollers) where extended oscillator stabilization is unnecessary. | Select MAX6473TA25AD2+ only if system boot timing allows reset deassertion within 20ms; verify clock startup meets µP requirements. |
| TPS79925YZUR | 2.5V LDO (300mA, 100µA IQ) with no integrated reset; requires external supervisor (e.g., TPS3808G18) for reset functionality. | Used where design flexibility justifies separate reset IC selection (e.g., custom timeout, dual-voltage monitoring). | Choose TPS79925YZUR + external supervisor only when precise reset timing control or multi-rail supervision is required - adds BOM cost and board area. |
Compared with MAX6473TA25AD2+, the MAX6473TA25AD3+ provides longer reset hold time for demanding clock stabilization; compared with TPS79925YZUR, it integrates reset functionality in a single chip, reducing component count and layout complexity for space-constrained portable designs.
Availability
MAX6473TA25AD3+ is available at Aetrix Electronics and suitable for handheld instruments, PCMCIA/USB peripheral designs, and Bluetooth module power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6473TA25AD3+ 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 ICs for industrial, automotive, and consumer applications.
The MAX6469–MAX6484 product line was designed specifically for battery-powered portable equipment needing ultra-low IQ, integrated reset supervision, and compact packaging - targeting PDA, cellular phone, and notebook subsystem markets.
FAQ
What is the exact output voltage and tolerance of the MAX6473TA25AD3+?
The MAX6473TA25AD3+ delivers a fixed 2.5V output voltage with ±2.0% accuracy over the full operating temperature range (-40°C to +85°C). This specification is guaranteed across all production units and includes initial calibration, line regulation, load regulation, and thermal drift contributions - confirmed in the Electrical Characteristics table of the official datasheet.
Does the MAX6473TA25AD3+ support manual reset (MR) functionality?
No, the MAX6473TA25AD3+ does not support manual reset. It belongs to the MAX6473–MAX6474 variant group, which implements SHDN-controlled shutdown instead of MR. Pin 3 is SHDN (active-low), not MR. Manual reset is only available on MAX6471/MAX6472/MAX6479/MAX6480 variants - confirmed by the Pin Description tables and Detailed Description section.
What is the purpose of the SET pin on the MAX6473TA25AD3+?
On the MAX6473TA25AD3+, the SET pin is used solely to select fixed-output operation: it must be connected to GND to enable the factory-trimmed 2.5V output. Unlike adjustable variants (e.g., MAX6469), this device does not support external resistor-divider networks on SET - the internal feedback network is permanently configured for 2.5V, and SET has no active role beyond grounding.
Can the MAX6473TA25AD3+ be used with input voltages below 2.5V?
No, the MAX6473TA25AD3+ requires a minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics. Its undervoltage lockout (UVLO) activates below 2.25V (typ), and regulator operation is not specified below VIN = 2.5V. For sub-2.5V inputs, consider alternative regulators such as the MAX1725 or MAX8865 series.
Is the exposed pad (EP) on the MAX6473TA25AD3+ electrically connected, and how should it be handled?
Yes, the exposed pad (EP) on the MAX6473TA25AD3+ is internally connected to GND and must be soldered to the PCB ground plane. It serves dual purposes: electrical grounding and thermal conduction. Leaving EP unconnected violates the Absolute Maximum Ratings and risks thermal overload or instability. The datasheet explicitly states EP is "internally connected to GND" and "must be connected to the ground plane."
MAX6473TA25AD3+ 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 (2.5V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.25V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 136 µA
- Current - Supply (Max):
- 96 µA
- PSRR:
- -
- Control Features:
- Manual Reset, 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)
MAX6473TA25AD3+ FAQ
1.How can I place an order for MAX6473TA25AD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6473TA25AD3+ 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 MAX6473TA25AD3+ reliable?
The price and inventory of MAX6473TA25AD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6473TA25AD3+ is usually 5 days.
3.What payment methods are accepted for MAX6473TA25AD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6473TA25AD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6473TA25AD3+?
MAX6473TA25AD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6473TA25AD3+ 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 MAX6473TA25AD3+?
For technical support, including MAX6473TA25AD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6473TA25AD3+ requirements.
6.How does Aetrix verify that MAX6473TA25AD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6473TA25AD3+ 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 MAX6473TA25AD3+ meets industry standards.
7.What is the process for return or replacement of MAX6473TA25AD3+?
All MAX6473TA25AD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6473TA25AD3+, 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 MAX6473TA25AD3+ part is unused and in its original packaging.
Return procedure for MAX6473TA25AD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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