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Analog Devices Inc./Maxim Integrated MAX6474TA25AD3+
- Part No.:
- MAX6474TA25AD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6474TA25AD3+.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,705
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Product details
Overview
MAX6474TA25AD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, preset 2.5V output, ±2.0% output voltage accuracy over -40°C to +85°C, 114mV dropout at 300mA load, and active-low open-drain RESET with 150ms timeout. It serves as power supply and system supervisor in battery-powered portable electronics requiring stable voltage and reliable power-on reset.
For engineers reviewing the MAX6474TA25AD3+ datasheet, MAX6474TA25AD3+ pinout, MAX6474TA25AD3+ application, or MAX6474TA25AD3+ equivalent, key selection considerations include its manual reset input (MR), shutdown capability (SHDN), 82µA quiescent current, -40°C to +85°C industrial temperature range, and compatibility with 3.3µF minimum output capacitance for stability.
Technical Context
The MAX6474TA25AD3+ integrates a precision LDO regulator core and a dedicated reset supervisor sharing the same reference. Its MR pin enables external assertion of reset while VOUT remains within specification, and SHDN provides active-low digital shutdown reducing supply current to 0.1µA. The device uses internal feedback for fixed 2.5V output and supports no external resistor network for this variant.
Reset threshold is -7.5% of nominal VOUT (i.e., 2.3125V min), with guaranteed 150ms (min) timeout after recovery. The open-drain RESET output sinks up to 3.2mA at 0.4V max, and the regulator features reverse current protection (0.01µA OUT→IN leakage), thermal shutdown at +180°C, and 450mA current limit.
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 and sensors. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-complexity SoCs or multiple peripherals in portable devices. |
| Dropout Voltage | 114mV at 300mA - enables operation from single-cell Li-ion (3.0V min) or triple-alkaline (4.5V) sources with margin. |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring or sleep-mode applications. |
| Reset Threshold | -7.5% of VOUT (2.3125V) - meets standard microprocessor supply tolerance requirements without external supervision. |
| Reset Timeout | 150ms minimum - satisfies boot-time sequencing requirements for ARM Cortex-M and similar processors. |
| Shutdown Current | 0.1µA typical - enables ultra-low-power deep-sleep states in IoT edge nodes. |
Pinout & Package
MAX6474TA25AD3+ is housed in an 8-pin TDFN-EP package (3mm × 3mm, 0.75mm height) with exposed paddle thermally connected to GND. Pin 1 = IN, Pin 2 = GND, Pin 3 = SHDN, Pin 4 = RESET, Pin 5 = MR, Pin 6 = OUT. Exposed paddle (EP) must be soldered to PCB ground plane for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator Input | Accepts 2.5V–5.5V input; requires 0.1µF bypass capacitor to GND for stability and noise rejection. |
| 2 (GND) | Ground & Thermal Pad | Primary return path and heatsink; must connect to large copper area or ground plane for thermal dissipation. |
| 3 (SHDN) | Active-Low Shutdown Control | Pulling low disables regulator and reduces total supply current to ≤0.1µA; connect to VIN for normal operation. |
| 4 (RESET) | Active-Low Open-Drain Reset Output | Sinks up to 3.2mA; requires external pullup to host VCC; asserts during power-up, brownout, or MR activation. |
| 5 (MR) | Active-Low Manual Reset Input | Asserts RESET when pulled low; internal 40kΩ pullup to VOUT; compatible with pushbutton or logic-level signals. |
| 6 (OUT) | Regulated Output | Delivers 2.5V @ 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Microprocessor Reset | Eliminates need for discrete supervisor IC; guarantees reset assertion during power-up, brownout, and manual trigger events. |
| Manual Reset Input (MR) | Enables field-serviceable or user-initiated system reset without cycling main power - critical for embedded diagnostics and firmware updates. |
| Low Quiescent Current (82µA) | Reduces standby power consumption by >90% vs. legacy supervisors, enabling multi-year battery life in coin-cell-powered sensors. |
| Thermal & Short-Circuit Protection | Prevents damage under fault conditions: thermal shutdown at +180°C with 20°C hysteresis, and 450mA current limit with safe short-to-ground operation. |
| Reverse Current Protection | 0.01µA typical OUT→IN leakage prevents backfeeding into primary battery during backup-supply scenarios or hot-swap events. |
Applications
| Handheld Medical Sensors | Industrial USB Field Devices |
|---|---|
Use Scenario: Portable pulse oximeter powered by CR2032 coin cell with Bluetooth LE transmission. IC Role / Device Role / Timing Role: Provides regulated 2.5V supply to analog front-end and BLE SoC; asserts RESET until VOUT stabilizes post-battery insertion. Use Value: 82µA quiescent current extends battery life beyond 2 years; MR pin enables one-button recalibration reset without full power cycle. |
Use Scenario: DIN-rail mounted USB-CAN adapter operating from 24V industrial bus via external buck converter. IC Role / Device Role / Timing Role: Final-stage LDO delivering clean 2.5V to USB PHY and CAN transceiver; RESET coordinates firmware initialization sequence. Use Value: 150ms reset timeout ensures CAN controller registers are fully initialized before bus arbitration begins. |
| Wireless Audio Transceivers | Smart Meter Communication Modules |
Use Scenario: Bluetooth audio transmitter module in hearing aid accessories using single AAA alkaline cell. IC Role / Device Role / Timing Role: Powers DSP and RF section; SHDN enables dynamic power gating during silence intervals. Use Value: 0.1µA shutdown current minimizes self-discharge during storage; dropout voltage allows operation down to 2.6V battery voltage. |
Use Scenario: PLC-based smart meter with optical port and RF mesh radio, powered from supercapacitor during mains outage. IC Role / Device Role / Timing Role: Maintains 2.5V rail during brief AC loss; RESET signals microcontroller to enter low-power mode and preserve RAM. Use Value: Reverse current protection prevents supercapacitor discharge into failed input stage; thermal shutdown avoids latch-up during ambient >70°C operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Dedicated supervisor IC (no LDO); requires external 2.5V regulator; 3.3V reset threshold only; no MR or SHDN. | Used where LDO and supervisor are separated for flexibility or thermal isolation. | Select when system already has a high-efficiency DC/DC converter and only needs precise reset timing. |
| AP7361-25SG-13 | Standalone 2.5V LDO (300mA); no reset, MR, or SHDN functions; 250mV dropout at 300mA; higher IQ (120µA). | Used in cost-sensitive designs where reset is handled by MCU internal BOR or separate discrete circuit. | Select when reset functionality is implemented elsewhere and lowest possible BOM count is prioritized over integration. |
Compared with TPS3808G33DBVR and AP7361-25SG-13, MAX6474TA25AD3+ uniquely combines regulation, reset supervision, manual reset, and shutdown in one 8-pin TDFN - reducing board area by ~40%, eliminating inter-component timing skew, and simplifying qualification for battery-powered safety-critical systems.
Availability
MAX6474TA25AD3+ is available at Aetrix Electronics and suitable for handheld medical sensors, industrial USB field devices, wireless audio transceivers, and smart meter communication modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6474TA25AD3+ 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 communications markets.
The MAX6469–MAX6484 product line was designed specifically for space-constrained, battery-operated portable equipment needing integrated power regulation and reliable microprocessor supervision - balancing ultra-low IQ, robust fault protection, and flexible reset control.
FAQ
What is the exact output voltage tolerance of the MAX6474TA25AD3+ across temperature?
The MAX6474TA25AD3+ guarantees ±2.0% output voltage accuracy over the full -40°C to +85°C operating temperature range. This is confirmed in the Electrical Characteristics table for MAX6469–MAX6476 fixed-output variants. At +25°C, the tighter ±1.3% tolerance applies. The 2.5V nominal output therefore remains between 2.45V and 2.55V across industrial temperatures, ensuring compatibility with 2.5V I/O interfaces and ADC references.
Does the MAX6474TA25AD3+ support adjustable output voltage?
No, the MAX6474TA25AD3+ does not support adjustable output voltage. It is a fixed-output variant with internal feedback set to 2.5V. The SET pin is not used in this configuration - per the MAX6473/MAX6474 pinout, Pin 5 is MR (Manual Reset), not SET. Adjustable operation is only available on MAX6469–MAX6472 and MAX6477–MAX6480 variants, which feature SET instead of MR.
What is the function of Pin 5 (MR) on the MAX6474TA25AD3+?
Pin 5 on the MAX6474TA25AD3+ is the active-low Manual Reset (MR) input. Pulling MR low asserts the RESET output regardless of VOUT level, and RESET remains asserted for the full 150ms timeout period after MR returns high. An internal 40kΩ pullup to VOUT eliminates need for external resistor. This enables hardware-triggered resets for field service, firmware recovery, or test mode entry without interrupting main power.
Can the MAX6474TA25AD3+ be used with a 3.3µF output capacitor?
Yes, the MAX6474TA25AD3+ is specified and stable with a minimum 3.3µF low-ESR ceramic output capacitor. The datasheet explicitly states "COUT = 3.3µF" in all Electrical Characteristics test conditions and recommends ≥3.3µF in the Pin Description table. Using a 3.3µF X7R 0805 capacitor with ≤10mΩ ESR ensures proper transient response and avoids oscillation, especially under 300mA load steps.
What is the maximum input voltage rating for the MAX6474TA25AD3+?
The absolute maximum input voltage for the MAX6474TA25AD3+ is +7V, as stated in the Absolute Maximum Ratings table. However, the recommended operating range is 2.5V to 5.5V. Operation above 5.5V risks exceeding power dissipation limits and violates functional specifications - for example, dropout voltage and load regulation are only characterized up to 5.5V. Sustained use at 6V or 7V is not advised without derating analysis.
MAX6474TA25AD3+ 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)
MAX6474TA25AD3+ FAQ
1.How can I place an order for MAX6474TA25AD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6474TA25AD3+ 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 MAX6474TA25AD3+ reliable?
The price and inventory of MAX6474TA25AD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6474TA25AD3+ is usually 5 days.
3.What payment methods are accepted for MAX6474TA25AD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6474TA25AD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6474TA25AD3+?
MAX6474TA25AD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6474TA25AD3+ 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 MAX6474TA25AD3+?
For technical support, including MAX6474TA25AD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6474TA25AD3+ requirements.
6.How does Aetrix verify that MAX6474TA25AD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6474TA25AD3+ 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 MAX6474TA25AD3+ meets industry standards.
7.What is the process for return or replacement of MAX6474TA25AD3+?
All MAX6474TA25AD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6474TA25AD3+, 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 MAX6474TA25AD3+ part is unused and in its original packaging.
Return procedure for MAX6474TA25AD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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