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Analog Devices Inc./Maxim Integrated MAX6471TA25BD3+
- Part No.:
- MAX6471TA25BD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX6471TA25BD3+.pdf
- Description:
- 300MA, LDO LINEAR REGULATOR WITH
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
The MAX6471TA25BD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.5V output, -12.5% reset threshold, and 150ms minimum reset timeout. It features 82µA quiescent current, 114mV dropout at full load, and operates across -40°C to +85°C. Designed for battery-powered portable electronics, it replaces discrete LDO + supervisor combinations in space-constrained PDA and Bluetooth modules.
For engineers reviewing the MAX6471TA25BD3+ datasheet, MAX6471TA25BD3+ pinout, MAX6471TA25BD3+ application, or MAX6471TA25BD3+ equivalent, key selection criteria include its manual reset input (MR), open-drain active-low RESET output, 2.5V fixed output accuracy of ±2.0%, and compatibility with 3.3µF ceramic output capacitors for stable regulation under dynamic loads.
Technical Context
The MAX6471TA25BD3+ integrates a precision LDO regulator core and a dedicated reset supervisor sharing the same internal reference. Its MR pin enables external assertion of reset while VOUT remains within specification, with internal 40kΩ pullup to OUT and 1µs minimum pulse width support.
Reset behavior is defined by a -12.5% VOUT threshold (90% nominal), 150ms timeout (D3 suffix), and 35µs propagation delay from VOUT drop to RESET assertion. The device uses an active-low SHDN input and supports reverse current protection (0.01µA OUT→IN leakage) and thermal shutdown at +180°C with 20°C hysteresis.
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 logic and analog subsystems |
| Max Output Current | 300mA guaranteed - sufficient to power microcontrollers, RF transceivers, and sensor interfaces simultaneously |
| Dropout Voltage | 114mV at 300mA - enables operation down to VIN = 2.614V, critical for single-cell Li-ion or 3×alkaline battery systems |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring applications without compromising startup speed |
| Reset Threshold | -12.5% of 2.5V (2.1875V min) - meets stringent microprocessor supply tolerance requirements for reliable brownout detection |
| Reset Timeout | 150ms minimum - provides adequate time for clock stabilization and memory initialization before processor release |
| Shutdown Current | 0.1µA typical - reduces system standby power to nanoampere levels when host controller disables regulation |
Pinout & Package
MAX6471TA25BD3+ is housed in an 8-pin TDFN package (3mm × 3mm, 0.5mm pitch) with exposed paddle thermally connected to GND. Pin 1 is IN, Pin 2 is GND, Pin 3 is SHDN, Pin 4 is RESET (open-drain active-low), Pin 5 is MR (manual reset input), and Pin 6 is OUT. The exposed paddle must be soldered to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Regulator input | Bypassed with 0.1µF capacitor; accepts 2.5V–5.5V input; undervoltage lockout triggers at 2.25V |
| GND | Ground reference & thermal path | Electrical return and primary heat sink; requires direct connection to large copper area |
| SHDN | Active-low shutdown control | Pulled high to IN for normal operation; drives regulator core and reference into ultra-low-power state |
| RESET | Active-low reset output | Open-drain configuration allows wired-OR with other supervisors; sinks 3.2mA at 0.4V max |
| MR | Manual reset input | Asserts RESET when pulled low; internal 40kΩ pullup to OUT eliminates need for external resistor |
| OUT | Regulated output | Delivers 2.5V @ 300mA; requires ≥3.3µF low-ESR ceramic capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset input (MR) | Enables system-level reset initiation without interrupting regulated output, supporting field service and test modes |
| -12.5% reset threshold accuracy | Guarantees deterministic reset assertion before microprocessor supply violation, eliminating marginal timing failures |
| 150ms reset timeout (D3) | Meets JEDEC JESD78 reliability requirements for post-power-up initialization sequencing |
| Reverse current protection | 0.01µA OUT→IN leakage prevents backup capacitor discharge into depleted battery during hot-swap events |
| Thermal shutdown with hysteresis | +180°C trip point and +20°C hysteresis enable self-recovery from transient overload without firmware intervention |
Applications
| Handheld Instrument Power | Bluetooth Module Regulation |
|---|---|
Use Scenario: Powering a handheld multimeter with LCD display, ADC, and wireless telemetry. IC Role / Device Role / Timing Role: Primary 2.5V supply regulator and system reset supervisor during battery insertion and low-voltage brownout. Use Value: 82µA quiescent current extends alkaline battery life beyond 12 months in sleep mode; MR pin allows button-activated calibration reset. | Use Scenario: Supplying 2.5V to Bluetooth SoC and associated RF front-end in wearable earbuds. IC Role / Device Role / Timing Role: LDO regulator with synchronized reset assertion to ensure clean boot after battery voltage recovery. Use Value: 114mV dropout enables operation down to 2.614V input, supporting full discharge of single-cell Li-ion; 150ms timeout guarantees crystal oscillator stabilization before BLE stack initialization. |
| PCMCIA Card Power | Digital Camera Sensor Bias |
Use Scenario: Providing regulated 2.5V to PCMCIA Wi-Fi card during hot-plug insertion into laptop slot. IC Role / Device Role / Timing Role: Regulator with undervoltage lockout and MR-initiated reset to handle transient bus voltage dips. Use Value: Input UVLO at 2.25V prevents erratic behavior during partial card insertion; open-drain RESET allows coexistence with host CPU's reset tree. | Use Scenario: Biasing CMOS image sensor analog front-end requiring low-noise, stable 2.5V supply. IC Role / Device Role / Timing Role: Precision LDO delivering clean power while asserting RESET if sensor bias drops below spec. Use Value: ±2.0% output accuracy maintains ADC reference integrity; 150ms reset hold-off prevents false trigger during flash LED current surges. |
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 | 250mA output, 120ms reset timeout, no MR pin, automotive-grade (-40°C to +125°C) | Lacks manual reset capability; suited for automotive infotainment but not field-serviceable instruments | Select when AEC-Q100 qualification and extended temperature range are mandatory, and MR is unnecessary |
| ADP196ACBZ-2.5-R7 | 300mA output, no integrated reset, requires external supervisor (e.g., ADM6315), 6-lead SOT-23 | Modular design increases BOM count and board area; reset timing less tightly coupled to VOUT | Select when design requires independent optimization of reset threshold or timeout, or when footprint constraints favor SOT-23 |
Compared with TPS76325QDBVRQ1 and ADP196ACBZ-2.5-R7, the MAX6471TA25BD3+ uniquely combines manual reset, precise -12.5% threshold, and 150ms timeout in a single 8-pin TDFN-reducing component count and improving power-rail coordination in portable medical and industrial handhelds.
Availability
MAX6471TA25BD3+ is available at Aetrix Electronics and suitable for handheld instrumentation, Bluetooth modules, PCMCIA cards, and digital camera power management requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX6471TA25BD3+ 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 portable applications.
The MAX6469–MAX6484 family was developed to integrate LDO regulation and microprocessor reset supervision into compact packages for battery-powered equipment where board space and quiescent power are critical constraints.
FAQ
What is the exact reset threshold voltage for MAX6471TA25BD3+?
The MAX6471TA25BD3+ has a -12.5% reset threshold relative to its 2.5V nominal output, meaning RESET asserts when VOUT falls below 2.1875V. This threshold is guaranteed across -40°C to +85°C and matches the "B" suffix in the ordering guide, confirming 85% to 90% VOUT tolerance range.
Does MAX6471TA25BD3+ support adjustable output voltage?
No, MAX6471TA25BD3+ does not support adjustable output. It belongs to the MAX6471–MAX6474/MAX6479–MAX6482 subgroup, which uses the FB pin for remote sensing-not SET-based adjustment. Its output is factory-trimmed to 2.5V with ±2.0% accuracy over temperature.
What is the function of the MR pin on MAX6471TA25BD3+?
The MR (Manual Reset) pin on MAX6471TA25BD3+ is an active-low input that asserts the RESET output even when VOUT is within specification. It features an internal 40kΩ pullup to OUT, enabling direct switch-to-ground connection without external components, and supports 1µs minimum pulse width for robust noise immunity.
Can MAX6471TA25BD3+ be used with ceramic output capacitors?
Yes, MAX6471TA25BD3+ is fully compatible with ceramic output capacitors. The datasheet specifies a minimum 3.3µF ceramic capacitor with ESR < 0.2Ω for stable operation across 1mA–300mA load range and -40°C to +85°C, eliminating need for tantalum or electrolytic alternatives.
What package type and thermal characteristics does MAX6471TA25BD3+ have?
MAX6471TA25BD3+ uses an 8-pin TDFN package (3mm × 3mm) with exposed paddle connected to GND. Its thermal resistance θJA is 24.4°C/W, enabling 1951mW maximum power dissipation at +70°C ambient, with derating above that temperature. The exposed paddle must be soldered to PCB ground plane for effective heat transfer.
MAX6471TA25BD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6471TA25BD3+ FAQ
1.How can I place an order for MAX6471TA25BD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6471TA25BD3+ 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 MAX6471TA25BD3+ reliable?
The price and inventory of MAX6471TA25BD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6471TA25BD3+ is usually 5 days.
3.What payment methods are accepted for MAX6471TA25BD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6471TA25BD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6471TA25BD3+?
MAX6471TA25BD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6471TA25BD3+ 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 MAX6471TA25BD3+?
For technical support, including MAX6471TA25BD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6471TA25BD3+ requirements.
6.How does Aetrix verify that MAX6471TA25BD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6471TA25BD3+ 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 MAX6471TA25BD3+ meets industry standards.
7.What is the process for return or replacement of MAX6471TA25BD3+?
All MAX6471TA25BD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6471TA25BD3+, 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 MAX6471TA25BD3+ part is unused and in its original packaging.
Return procedure for MAX6471TA25BD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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