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Analog Devices Inc./Maxim Integrated MAX6474TA30AD3
- Part No.:
- MAX6474TA30AD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6474TA30AD3.pdf
- Description:
- IC REG LINEAR LDO WITH MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,371
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Product details
Overview
MAX6474TA30AD3 from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 3.0V output, -12.5% reset threshold, 150ms minimum reset timeout, and active-low shutdown input. It delivers ±2.0% output accuracy over -40°C to +85°C, consumes only 82µA quiescent current, and supports battery-powered portable systems requiring stable voltage and reliable power-on reset.
For engineers reviewing the MAX6474TA30AD3 datasheet, MAX6474TA30AD3 pinout, MAX6474TA30AD3 application, or MAX6474TA30AD3 equivalent, this device serves as a single-chip solution for regulated power delivery and system-level reset supervision in space-constrained, low-power embedded designs-especially where manual reset assertion and thermal/short-circuit protection are required.
Technical Context
The MAX6474TA30AD3 implements a dual-function architecture: an LDO regulator core with 55mV dropout at 150mA and a tightly coupled reset supervisor using the same internal reference. Its reset circuit asserts active-low RESET when VOUT falls below 87.5% of nominal (i.e., 2.625V for 3.0V output) or when SHDN is pulled low, holding RESET asserted for ≥150ms after recovery.
This variant belongs to the MAX6471–MAX6474 subgroup, featuring SHDN (Pin 3) and MR (Pin 5) inputs-enabling both automatic shutdown control and operator-initiated reset while VOUT remains in specification. It uses the 8-pin TDFN-EP package with exposed paddle for enhanced thermal performance and operates across 2.5V–5.5V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±2.0% over -40°C to +85°C - ensures stable core logic supply for 3.3V-tolerant microcontrollers. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-complexity SoCs, RF modules, or sensor subsystems without external boost. |
| Dropout Voltage | 114mV at 300mA load - enables operation down to VIN = 3.114V, critical for single-cell Li-ion or 3×alkaline battery systems. |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring applications such as Bluetooth LE peripherals. |
| Reset Threshold | -12.5% of VOUT (2.625V) - provides tighter brownout detection than -7.5% variants, reducing false resets during transient dips. |
| Reset Timeout | 150ms minimum - meets JEDEC JESD78 requirements for microprocessor initialization timing and clock stabilization. |
| Shutdown Current | 0.1µA typical - allows deep-sleep modes in portable instrumentation with multi-year battery life targets. |
Pinout & Package
MAX6474TA30AD3 is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad (EP), rated for -40°C to +85°C operation. The EP must be soldered to PCB ground plane for thermal integrity and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator Input | Accepts 2.5V–5.5V unregulated supply; requires 0.1µF ceramic bypass to GND for stability. |
| 2 (GND) | Ground / Thermal Sink | Primary return path and thermal conduction node; must connect to large copper area or ground plane. |
| 3 (SHDN) | Active-Low Shutdown Control | Pulling low disables regulator and reduces IQ to 0.1µA; tied to IN for normal operation. |
| 4 (RESET) | Active-Low Reset Output (push-pull) | Drives µP reset pin directly; asserts low during power-up, brownout, or SHDN activation. |
| 5 (MR) | Active-Low Manual Reset Input | Allows external reset initiation (e.g., button press); internal 40kΩ pullup to VOUT eliminates need for external resistor. |
| 6 (SET) | Feedback Reference Input | Connected to GND for fixed 3.0V output; not used for adjustable mode in this variant. |
| 7,8 (OUT) | Regulated Output | Delivers 3.0V @ up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor at output for transient response. |
| EP | Exposed Paddle | Internally connected to GND; mandatory connection to PCB ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Reset Supervisor | Eliminates need for discrete supervisor IC; provides synchronized reset assertion on power-up, brownout, and shutdown events. |
| Manual Reset Input (MR) | Enables field-serviceable or user-triggered system reset without cycling main power-critical for handheld test equipment. |
| Thermal & Short-Circuit Protection | Shuts down pass transistor at 180°C junction temperature with 20°C hysteresis; survives indefinite output short to GND. |
| Reverse Current Blocking | 0.01µA typical OUT-to-IN leakage prevents backup battery discharge when main supply is removed. |
| Low-Noise Regulation | 75µVRMS output noise (10Hz–100kHz) - preserves signal integrity in analog front-ends and precision ADC references. |
Applications
| Handheld Medical Diagnostics | Industrial Wireless Sensor Node |
|---|---|
|
Use Scenario: Portable blood glucose meter with LCD display, Bluetooth LE radio, and electrochemical sensor interface operating from two AA alkaline cells. IC Role / Device Role: Primary 3.0V power rail generator and system reset supervisor ensuring clean µC boot after battery insertion or low-voltage recovery. Use Value: 114mV dropout enables >300 hours runtime per battery set; 150ms reset timeout guarantees full oscillator stabilization before firmware execution. |
Use Scenario: Battery-powered vibration monitor mounted on rotating machinery, transmitting data via LoRaWAN every 5 minutes. IC Role / Device Role: Regulates 3.0V supply for MCU, RF transceiver, and MEMS accelerometer while asserting RESET during wake-up from ultra-low-power sleep. Use Value: 82µA quiescent current minimizes self-discharge; MR pin allows wired maintenance reset without opening enclosure. |
| USB-Powered Test Adapter | Bluetooth Audio Earbud Charging Case |
|
Use Scenario: Compact USB-C adapter that powers and configures legacy RS-232/RS-485 peripherals using a 32-bit ARM Cortex-M0+. IC Role / Device Role: Provides isolated 3.0V domain for logic and reset sequencing, decoupled from noisy USB 5V bus via LDO filtering. Use Value: 75µVRMS noise prevents digital switching artifacts from corrupting UART timing; push-pull RESET drives µC reset directly without pullup. |
Use Scenario: Rechargeable case supplying regulated 3.0V to earbuds during charging and storage, with battery-level monitoring. IC Role / Device Role: Delivers stable 3.0V to earbud PMIC while asserting RESET if case battery drops below safe operating voltage. Use Value: -12.5% reset threshold (2.625V) prevents premature shutdown during high-current charging pulses; SHDN enables case power gating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6474TA30BD3 | Same package and pinout, but -7.5% reset threshold (2.775V) and 150ms timeout - less aggressive brownout detection. | Suitable for systems with looser supply tolerance or higher noise immunity requirements on reset assertion. | Select MAX6474TA30BD3 only if design requires earlier reset deassertion during marginal VOUT recovery. |
| TPS76330QDBVRQ1 | Automotive-grade 3.0V LDO (300mA) with 2% accuracy and 120mV dropout, but no integrated reset or MR input. | Requires external supervisor (e.g., TPS3809K33) for reset functionality - increases BOM count and board area. | Choose TPS76330QDBVRQ1 only for AEC-Q100-compliant automotive modules where reset is handled separately. |
Compared with MAX6474TA30BD3 and TPS76330QDBVRQ1, the MAX6474TA30AD3 uniquely integrates manual reset, precise -12.5% brownout detection, and sub-1µA shutdown in a single 3×3mm TDFN-reducing component count, layout complexity, and system-level validation effort for portable electronics.
Availability
MAX6474TA30AD3 is available at Aetrix Electronics and suitable for handheld medical diagnostics, industrial wireless sensor nodes, USB-powered test adapters, and Bluetooth audio charging cases requiring stable component supply and long-term production continuity.
Supply support for MAX6474TA30AD3 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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6469–MAX6484 product line was engineered specifically for battery-powered portable electronics needing combined regulation and intelligent reset supervision in minimal footprint-emphasizing ultra-low quiescent current, thermal robustness, and functional integration.
FAQ
What is the exact reset threshold voltage for MAX6474TA30AD3?
The MAX6474TA30AD3 features a -12.5% reset threshold relative to its nominal 3.0V output, resulting in a guaranteed assertion point between 2.625V and 2.700V (85%–90% of VOUT). This threshold is factory-trimmed and specified over -40°C to +85°C, ensuring reliable brownout detection without external components. The MAX6474TA30AD3 uses the 'B' suffix in the ordering guide to denote this -12.5% tolerance.
Does MAX6474TA30AD3 support adjustable output voltage?
No, the MAX6474TA30AD3 is configured for fixed 3.0V output. Its SET pin is internally connected to GND for preset operation and must remain grounded; connecting external resistors to SET will not alter the output voltage. Adjustable output capability is reserved for other members of the family (e.g., MAX6470 series), not the MAX6474TA30AD3 variant.
Can MAX6474TA30AD3 drive a 300mA load continuously at 85°C ambient?
Yes, the MAX6474TA30AD3 guarantees 300mA output current over -40°C to +85°C ambient, provided thermal design meets specifications: the 8-pin TDFN-EP package requires proper PCB copper area under the exposed paddle (EP) to maintain junction temperature ≤150°C. At 85°C ambient and 300mA load with VIN = 4.5V, thermal calculations confirm safe operation with ≥2 cm² of 2-oz copper connected to EP.
How does the manual reset (MR) pin behave when unused?
When unused, the MR pin of the MAX6474TA30AD3 should be left floating or connected to VOUT, as it features an internal 40kΩ pullup resistor to VOUT. This ensures MR remains high and does not inadvertently assert RESET. No external pullup is required, and connecting MR directly to GND will force continuous RESET assertion-making it ideal for momentary switch interfaces without debounce circuitry.
What protection features are built into MAX6474TA30AD3?
The MAX6474TA30AD3 integrates input reverse-current blocking (0.01µA OUT-to-IN leakage), thermal shutdown (180°C trip with 20°C hysteresis), short-circuit current limiting (450mA min), and undervoltage lockout (2.25V–2.47V). These protections operate autonomously without external components, safeguarding both the IC and downstream circuitry during fault conditions such as battery reversal, PCB shorts, or overheating.
MAX6474TA30AD3 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 (3V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.19V @ 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)
MAX6474TA30AD3 FAQ
1.How can I place an order for MAX6474TA30AD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6474TA30AD3 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 MAX6474TA30AD3 reliable?
The price and inventory of MAX6474TA30AD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6474TA30AD3 is usually 5 days.
3.What payment methods are accepted for MAX6474TA30AD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6474TA30AD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6474TA30AD3?
MAX6474TA30AD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6474TA30AD3 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 MAX6474TA30AD3?
For technical support, including MAX6474TA30AD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6474TA30AD3 requirements.
6.How does Aetrix verify that MAX6474TA30AD3 is sourced from the original manufacturer or authorized distributors?
All MAX6474TA30AD3 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 MAX6474TA30AD3 meets industry standards.
7.What is the process for return or replacement of MAX6474TA30AD3?
All MAX6474TA30AD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6474TA30AD3, 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 MAX6474TA30AD3 part is unused and in its original packaging.
Return procedure for MAX6474TA30AD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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