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Analog Devices Inc./Maxim Integrated MAX6471TA25AD3+T
- Part No.:
- MAX6471TA25AD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6471TA25AD3+T.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,203
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Product details
Overview
The MAX6471TA25AD3+T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, preset 2.5V output, -7.5% reset threshold, and 150ms minimum reset timeout. It features active-low manual reset (MR) input, 82µA quiescent current, and operates from 2.5V to 5.5V input across -40°C to +85°C. Designed for battery-powered portable systems requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6471TA25AD3+T datasheet, MAX6471TA25AD3+T pinout, MAX6471TA25AD3+T application, or MAX6471TA25AD3+T equivalent, this device delivers verified 2.5V regulation with integrated supervisor functionality - eliminating external reset ICs in space-constrained handheld instruments, USB peripherals, and wireless modules where supply stability and deterministic reset timing are critical.
Technical Context
The MAX6471TA25AD3+T implements a dual-function LDO core with internal reference and comparator-based reset supervision sharing the same voltage reference. Its MR input asserts RESET while pulled low and sustains assertion for the full 150ms timeout after release, independent of VOUT status - enabling controlled system resets during operation.
This variant belongs to the MAX6471–MAX6474/MAX6479–MAX6482 subgroup, confirming presence of MR pin (Pin 3), absence of SHDN, and fixed-output configuration via SET-to-GND connection. The -7.5% reset threshold (A-suffix) and D3 timeout (150ms min) are factory-trimmed and guaranteed over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V fixed, ±2.0% accuracy over -40°C to +85°C - ensures stable core logic supply for 2.5V microcontrollers and memory interfaces. |
| Max Output Current | 300mA guaranteed - supports moderate-power SoCs, RF transceivers, and sensor hubs without external pass devices. |
| Dropout Voltage | 114mV at 300mA load - enables operation down to VIN = 2.614V, critical for single-cell Li-ion or alkaline battery systems near end-of-life. |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring applications such as Bluetooth LE peripherals and smart sensors. |
| Reset Threshold | -7.5% of nominal VOUT (2.3125V min) - aligns with standard µP supply tolerance requirements and avoids false resets during transient dips. |
| Reset Timeout | 150ms minimum - provides sufficient time for clock stabilization and memory initialization before processor release. |
| Input Voltage Range | 2.5V to 5.5V - compatible with common battery chemistries (Li-ion, Li-Po, 2–3 cell alkaline) and USB 5V bus inputs. |
Pinout & Package
MAX6471TA25AD3+T is housed in an 8-pin TDFN-EP package (3mm × 3mm, 0.75mm height) with exposed thermal pad. Pin 1 is IN; Pin 2 is GND; Pin 3 is MR (active-low manual reset); Pin 4 is RESET (active-low push-pull); Pin 5 is SET (tied to GND for 2.5V fixed output); Pin 6 is OUT; Pins 7–8 are unused; EP is internally connected to GND and must be soldered to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input supply | Accepts 2.5V–5.5V; requires 0.1µF ceramic bypass to GND for stability and noise rejection. |
| 2 (GND) | Power and thermal reference | Primary ground return path; also serves as heatsink - must connect to large copper area or ground plane. |
| 3 (MR) | Active-low manual reset input | Pulls RESET low when asserted; internal 40kΩ pullup to VOUT eliminates need for external resistor unless noise immunity required. |
| 4 (RESET) | Active-low push-pull reset output | Drives µP reset pin directly; sinks ≥3.2mA at 0.4V - no external pullup needed for most microcontrollers. |
| 5 (SET) | Feedback reference node | Internally tied to 1.229V reference; grounded for fixed 2.5V output - floating or misconnected causes undefined regulation. |
| 6 (OUT) | Regulated output | Delivers 2.5V @ up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor with <100mΩ ESR for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset (MR) | Enables operator-initiated or test-system-triggered reset without disrupting regulated output - critical for field diagnostics and firmware recovery. |
| 150ms reset timeout (D3) | Guarantees sufficient hold-off time for oscillator startup and memory initialization before CPU release - prevents race conditions in boot sequences. |
| Low 82µA quiescent current | Reduces standby power draw to <206nW per volt - extends shelf life and operational runtime in battery-backed IoT edge nodes. |
| Reverse current protection | 0.01µA typical OUT-to-IN leakage - prevents backup capacitors or secondary batteries from discharging into depleted primary sources. |
| Thermal shutdown with hysteresis | Activates at +180°C with +20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Applications
| Handheld Instruments | USB Peripheral Devices |
|---|---|
|
Use Scenario: Powering ARM Cortex-M based data loggers in portable multimeters with real-time display and SD card storage. IC Role / Device Role: Primary 2.5V supply for MCU, ADC, and LCD controller; MR pin used for front-panel reset button. Use Value: 150ms RESET timeout ensures stable 2.5V rail before ADC calibration sequence begins - eliminating measurement offset drift during power-up. |
Use Scenario: Regulating power for USB audio adapters with embedded DAC and headphone amplifier. IC Role / Device Role: Clean 2.5V bias for analog audio stages; RESET synchronizes DAC initialization with USB enumeration. Use Value: 82µA IQ minimizes host bus power consumption during suspend mode - meeting USB 2.0 low-power idle requirements. |
| Bluetooth Low Energy Modules | Digital Camera Sensor Interfaces |
|
Use Scenario: Supplying 2.5V to BLE SoC (e.g., nRF52832) and associated flash memory in coin-cell powered trackers. IC Role / Device Role: Main system regulator with MR-driven firmware update reset; RESET asserts on brownout below 2.3125V. Use Value: -7.5% reset threshold matches Nordic Semiconductor's recommended VDD monitor window - preventing corrupted flash writes during battery sag. |
Use Scenario: Providing regulated 2.5V to CMOS image sensor interface logic and timing controller in compact action cameras. IC Role / Device Role: Secondary rail derived from main 3.3V buck converter; RESET coordinates sensor initialization with ISP boot. Use Value: 114mV dropout at 300mA allows operation down to 2.614V input - sustaining video capture until single-cell Li-ion drops to 2.7V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76325QDBVRQ1 | 2.5V fixed, 150mA max, 120mV dropout at 150mA, open-drain RESET, no MR input | Lacks manual reset capability; lower current rating limits use in higher-power BLE or sensor fusion designs | Select only if MR functionality is unnecessary and load current remains ≤150mA - requires external pullup on RESET. |
| ADP196ACBZ-2.5-R7 | 2.5V fixed, 300mA, 200mV dropout at 300mA, no integrated reset or MR | Requires external supervisor IC (e.g., ADM6315) for reset generation - increases BOM count and board area | Choose when design prioritizes ultra-low noise (<15µVRMS) over integration - adds complexity but improves analog signal integrity. |
Compared with TPS76325QDBVRQ1 and ADP196ACBZ-2.5-R7, the MAX6471TA25AD3+T uniquely combines 300mA drive, MR input, and 150ms timeout in a single 8-pin TDFN - reducing component count and simplifying power sequencing in compact battery-powered systems where deterministic manual and brownout reset behavior is mandatory.
Availability
MAX6471TA25AD3+T is available at Aetrix Electronics and suitable for handheld instruments, USB peripheral devices, and Bluetooth Low Energy modules requiring stable component supply with long-term lifecycle support and RoHS-compliant packaging.
Supply support for MAX6471TA25AD3+T 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, automotive, and communications applications.
The MAX6469–MAX6484 family was engineered specifically for battery-powered portable equipment needing integrated power regulation and microprocessor supervision in minimal footprint - addressing the need for reduced external components and guaranteed reset timing in space-constrained designs.
FAQ
What output voltage does the MAX6471TA25AD3+T deliver?
The MAX6471TA25AD3+T delivers a factory-trimmed fixed output voltage of 2.5V with ±2.0% accuracy over the full -40°C to +85°C operating range. This value is confirmed by the "25" suffix in the part number and verified in the Electrical Characteristics table under Output Voltage Accuracy for MAX6471–MAX6474 devices. The SET pin must be connected to GND to enable this preset mode.
Does the MAX6471TA25AD3+T include a manual reset input?
Yes, the MAX6471TA25AD3+T includes an active-low manual reset input (MR) on Pin 3. As documented in the Pin Description and Detailed Description sections, asserting MR low forces the RESET output active for the full 150ms timeout period, even if VOUT remains within specification - enabling hardware-triggered system resets for firmware updates or fault recovery.
What is the reset timeout duration for the MAX6471TA25AD3+T?
The MAX6471TA25AD3+T has a minimum reset timeout duration of 150ms, indicated by the "D3" suffix. This value is guaranteed across temperature and process variation, and is distinct from the 2.5ms (D1), 20ms (D2), and 1200ms (D4) options available in the MAX6469–MAX6484 family. The timeout begins after MR release or VOUT recovery and holds RESET low for the full interval.
What package type is used for the MAX6471TA25AD3+T?
The MAX6471TA25AD3+T uses an 8-pin TDFN-EP (Thin Dual Flat No-lead with Exposed Pad) package measuring 3mm × 3mm. This is confirmed by the "TA" prefix in the part number and the Ordering Information table, which specifies "8 TDFN-EP" for TA-suffixed variants. The exposed pad (EP) is internally connected to GND and must be soldered to the PCB ground plane for thermal performance.
How does the MAX6471TA25AD3+T handle reverse current flow?
The MAX6471TA25AD3+T incorporates reverse current protection that limits OUT-to-IN leakage to 0.01µA typical when VOUT > VIN. This prevents backup capacitors or secondary batteries from discharging into a depleted primary source. The feature is explicitly specified in the Electrical Characteristics table under "Input Reverse Leakage Current" and is implemented via internal circuitry that disables the pass transistor's parasitic diode path.
MAX6471TA25AD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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
- 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)
MAX6471TA25AD3+T FAQ
1.How can I place an order for MAX6471TA25AD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6471TA25AD3+T 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 MAX6471TA25AD3+T reliable?
The price and inventory of MAX6471TA25AD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6471TA25AD3+T is usually 5 days.
3.What payment methods are accepted for MAX6471TA25AD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6471TA25AD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6471TA25AD3+T?
MAX6471TA25AD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6471TA25AD3+T 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 MAX6471TA25AD3+T?
For technical support, including MAX6471TA25AD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6471TA25AD3+T requirements.
6.How does Aetrix verify that MAX6471TA25AD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6471TA25AD3+T 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 MAX6471TA25AD3+T meets industry standards.
7.What is the process for return or replacement of MAX6471TA25AD3+T?
All MAX6471TA25AD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6471TA25AD3+T, 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 MAX6471TA25AD3+T part is unused and in its original packaging.
Return procedure for MAX6471TA25AD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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