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Analog Devices Inc./Maxim Integrated MAX6471TA25AD3+
- Part No.:
- MAX6471TA25AD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6471TA25AD3+.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,840
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Product details
Overview
MAX6471TA25AD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.5V output voltage, -7.5% reset threshold, 150ms minimum reset timeout, and active-low manual reset (MR) input. It operates from 2.5V to 5.5V input, delivers ±2.0% output accuracy over -40°C to +85°C, and consumes only 82µA quiescent current - ideal for battery-powered portable electronics requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6471TA25AD3+ datasheet, MAX6471TA25AD3+ pinout, MAX6471TA25AD3+ application, or MAX6471TA25AD3+ equivalent, key selection criteria include its manual reset capability, guaranteed 300mA output under dropout conditions, 55mV dropout at 150mA, integrated thermal/short-circuit protection, and compatibility with compact 8-pin TDFN-EP packaging for space-constrained embedded designs.
Technical Context
The MAX6471TA25AD3+ integrates a precision LDO regulator core with a dedicated reset supervisor using a shared bandgap reference. Its MR input features a 40kΩ internal pullup to VOUT and supports TTL/CMOS logic-level assertion with 1µs minimum pulse width and 120ns glitch rejection.
Reset assertion occurs when VOUT falls below 92.5% of nominal (2.313V at 2.5V output) or when MR is pulled low; RESET remains active for ≥150ms after recovery. The device uses an NMOS pass transistor enabling low dropout and reverse current blocking (0.01µA OUT→IN leakage).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2.0% over -40°C to +85°C - ensures stable core voltage for 2.5V microcontrollers and memory without external feedback components. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-complexity SoCs, RF modules, or sensor subsystems in portable devices. |
| Dropout Voltage | 55mV at 150mA load - enables operation down to VIN = 2.55V while maintaining regulation, critical for single-cell Li-ion or alkaline battery systems. |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring applications such as Bluetooth LE peripherals or IoT edge sensors. |
| Reset Threshold | -7.5% of VOUT (2.313V) - aligns with standard microprocessor supply tolerance requirements and eliminates need for external supervisor IC. |
| Reset Timeout | 150ms minimum - provides sufficient hold-off time for clock stabilization and processor initialization before release from reset. |
| Shutdown Current | 0.1µA typical - reduces system standby power to nanoampere levels when host controller disables power rail. |
Pinout & Package
MAX6471TA25AD3+ is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) package with exposed paddle thermally connected to GND. Pin 1 is IN; Pin 2 is GND; Pin 3 is MR; Pin 4 is RESET; Pin 5 is SET; Pin 6 is OUT; Pins 7–8 are NC; Exposed paddle (EP) must be soldered to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input | Accepts 2.5V–5.5V supply; requires 0.1µF bypass capacitor to GND for stability and noise suppression. |
| 2 (GND) | Ground and thermal pad | Primary return path and heatsink; must connect to large copper area or ground plane to maintain TJ ≤ +150°C. |
| 3 (MR) | Active-low manual reset input | Asserts RESET when pulled low; internal 40kΩ pullup to VOUT eliminates need for external resistor in most cases. |
| 4 (RESET) | Active-low reset output | Push-pull configuration; drives µP reset pin directly; asserts during power-up, brownout, or MR activation. |
| 5 (SET) | Feedback reference input | Connected to GND for fixed 2.5V output; left unconnected or tied to GND - not used in preset mode. |
| 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 manual reset (MR) | Enables system-level reset initiation without external logic - simplifies board design and reduces BOM count in handheld instruments. |
| Reverse current protection | 0.01µA typical OUT→IN leakage prevents battery backfeed - essential for backup-supply architectures and hot-swap applications. |
| Thermal shutdown with hysteresis | Activates at +180°C with 20°C hysteresis - protects against sustained overload while allowing safe recovery without latch-up. |
| Low-noise LDO core | 75µVRMS output noise (10Hz–100kHz) - preserves signal integrity in analog front-ends and RF power management circuits. |
| Input undervoltage lockout | 2.25V to 2.47V threshold - prevents erratic regulator behavior during battery ramp-up and ensures clean power-on sequencing. |
Applications
| Handheld Instruments | PCMCIA / USB Devices |
|---|---|
Use Scenario: Powering ARM Cortex-M based data loggers in field-deployable PDAs with dual-battery switchover. IC Role / Device Role / Timing Role: Primary 2.5V supply regulator with synchronized reset assertion during battery transition to prevent firmware corruption. Use Value: MR input allows on-demand recalibration reset; 150ms timeout ensures ADC reference and crystal oscillator stabilize before sampling begins. |
Use Scenario: Providing regulated 2.5V rail to USB 2.0 transceivers and EEPROM in compact PCMCIA cards. IC Role / Device Role / Timing Role: LDO + supervisor combo eliminating discrete reset IC and reducing footprint by >30% vs. dual-chip solution. Use Value: 55mV dropout enables full USB operation down to 2.55V input - extending usable battery range in portable card readers. |
| Cellular Telephones | Digital Cameras |
Use Scenario: Supplying baseband processor I/O voltage in GSM/GPRS handsets with aggressive power cycling. IC Role / Device Role / Timing Role: Regulator with manual reset support for factory test mode entry and firmware update recovery sequences. Use Value: 0.1µA shutdown current minimizes leakage during deep sleep; MR pin accepts direct connection to test-mode switch without debouncing. |
Use Scenario: Powering image signal processor (ISP) and CMOS sensor interface in DSLR-style digital cameras. IC Role / Device Role / Timing Role: Stable 2.5V source with precise reset timing to coordinate sensor initialization, lens actuator calibration, and flash charging. Use Value: ±2.0% output accuracy maintains ISP analog bias points across temperature; 150ms reset ensures full sensor register loading before first frame capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76325DBVR | 250mA output, no MR input, 3.5% output accuracy, 120ms reset timeout | Lacks manual reset functionality; requires external circuitry for test/reset control | Select when MR is unnecessary and cost sensitivity outweighs feature parity |
| ADM6315-25ARTZ-R7 | Standalone reset IC only (no LDO), 2.5V threshold, 200ms timeout, SOT23-3 | Requires separate LDO; adds board area and component count | Choose only if existing LDO cannot be replaced and reset timing flexibility is critical |
Compared with TPS76325DBVR and ADM6315-25ARTZ-R7, MAX6471TA25AD3+ uniquely integrates 300mA LDO regulation, manual reset, and precise 150ms timeout in a single 8-pin TDFN - reducing total solution size by 40% and eliminating inter-component timing skew in battery-powered systems.
Availability
MAX6471TA25AD3+ is available at Aetrix Electronics and suitable for handheld instrumentation, USB peripheral power management, and cellular baseband supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6471TA25AD3+ 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.
MAX6471TA25AD3+ belongs to the MAX6469–MAX6484 family of ultra-low-quiescent-current LDOs with integrated reset - designed specifically for battery-operated portable equipment demanding high reliability, minimal footprint, and robust power sequencing.
FAQ
What is the function of the SET pin on the MAX6471TA25AD3+?
The SET pin on the MAX6471TA25AD3+ is configured for fixed-output operation and must be connected to GND to select the preset 2.5V output. Unlike adjustable variants, it is not used for external feedback in this part; leaving it floating or improperly biased may cause regulation instability. MAX6471TA25AD3+ does not support adjustable output voltage.
Does the MAX6471TA25AD3+ support push-pull or open-drain RESET output?
The MAX6471TA25AD3+ features a push-pull RESET output, capable of actively driving both high and low states without requiring an external pullup resistor. This simplifies interface to microcontroller reset inputs and ensures fast, deterministic deassertion timing - critical for meeting processor reset release specifications in the MAX6471TA25AD3+ datasheet.
What is the minimum input voltage required for the MAX6471TA25AD3+ to maintain regulation at 300mA?
The MAX6471TA25AD3+ requires a minimum input voltage of 2.658V to maintain 2.5V output regulation at 300mA load, based on its maximum dropout voltage of 158mV (typical 114mV) at that current. Below this VIN, the device enters dropout and VOUT drops linearly with VIN - a key constraint verified in the MAX6471TA25AD3+ electrical characteristics table.
How does the MR input behave when not used in the MAX6471TA25AD3+?
When unused, the MR input on the MAX6471TA25AD3+ should be left unconnected or tied to VOUT, as it features a 40kΩ internal pullup to VOUT. This ensures the MR pin remains high and does not inadvertently assert RESET. No external pullup is required, and connecting MR to GND will force continuous reset assertion - a behavior confirmed in the MAX6471TA25AD3+ pin description section.
Is the MAX6471TA25AD3+ compatible with lead-free reflow processes?
Yes, the MAX6471TA25AD3+ is offered in RoHS-compliant, lead(Pb)-free packaging. It supports JEDEC J-STD-020C reflow profiles with peak temperature up to +260°C. The TDFN-EP package requires preheating and prohibits hand or wave soldering - all thermal requirements are explicitly defined in the MAX6471TA25AD3+ absolute maximum ratings and packaging notes.
MAX6471TA25AD3+ 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
- 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+ FAQ
1.How can I place an order for MAX6471TA25AD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6471TA25AD3+ 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+ reliable?
The price and inventory of MAX6471TA25AD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6471TA25AD3+ is usually 5 days.
3.What payment methods are accepted for MAX6471TA25AD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6471TA25AD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6471TA25AD3+?
MAX6471TA25AD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6471TA25AD3+ 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+?
For technical support, including MAX6471TA25AD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6471TA25AD3+ requirements.
6.How does Aetrix verify that MAX6471TA25AD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6471TA25AD3+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6471TA25AD3+?
All MAX6471TA25AD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6471TA25AD3+, 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+ part is unused and in its original packaging.
Return procedure for MAX6471TA25AD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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