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Analog Devices Inc./Maxim Integrated MAX6471TA18BD3+
- Part No.:
- MAX6471TA18BD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6471TA18BD3+.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,458
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Product details
Overview
MAX6471TA18BD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 1.8V output voltage, -7.5% reset threshold accuracy, and 150ms (min) active-low reset timeout. It features manual reset input (MR), 82µA quiescent current, and operates from 2.5V to 5.5V input. Designed for battery-powered portable electronics requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6471TA18BD3+ datasheet, MAX6471TA18BD3+ pinout, MAX6471TA18BD3+ application, or MAX6471TA18BD3+ equivalent, this device delivers verified 1.8V regulation with integrated MR-triggered reset supervision, low-noise operation, thermal/short-circuit protection, and shutdown capability - critical for handheld instruments, Bluetooth modules, and USB peripherals where supply stability and system initialization integrity are essential.
Technical Context
The MAX6471TA18BD3+ integrates a precision LDO regulator core with a dedicated reset supervisor sharing the same reference. Its MR input enables external assertion of RESET while VOUT remains within ±2.0% tolerance, with internal 40kΩ pullup to VOUT. The reset circuit guarantees assertion during VIN undervoltage lockout (2.25V–2.47V), VOUT dropout, and MR low transitions - all followed by a fixed 150ms minimum timeout before deassertion.
This variant belongs to the MAX6471–MAX6474/MAX6479–MAX6482 subgroup, confirming presence of MR pin (Pin 3), absence of SHDN, and use of SET pin (Pin 5) for fixed/adjustable mode selection. It uses the standard 8-pin TDFN-EP package with exposed paddle, supporting thermal dissipation up to 1951mW at +70°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2.0% over -40°C to +85°C - ensures stable core logic supply for 1.8V microcontrollers and memory interfaces. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-complexity SoCs or multiple peripheral ICs in portable devices. |
| Dropout Voltage | 61mV at 150mA, 114mV at 300mA (VOUT = 1.8V) - enables operation down to ~1.91V input at full load, extending battery life. |
| Quiescent Current | 82µA typical - minimizes standby drain in always-on subsystems like real-time clocks or wake-on-event circuits. |
| Reset Threshold | -7.5% of nominal VOUT (i.e., 1.665V) - triggers RESET before processor supply violates JEDEC JESD8-12B specification limits. |
| Reset Timeout | 150ms minimum - provides sufficient hold time for clock stabilization and firmware initialization on cold start or brownout recovery. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), dual-cell alkaline (2.4–3.2V), and USB 5V bus inputs. |
Pinout & Package
MAX6471TA18BD3+ is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.75mm height) package with exposed thermal pad (EP) internally connected to GND. The EP must be soldered to a PCB ground plane for optimal thermal performance and electrical stability.
| 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 and noise suppression. |
| 2 (GND) | Ground reference and thermal path | Primary return for regulator and reset circuitry; 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 reset output | Push-pull configuration; drives low during power-up, brownout, or MR assertion, then holds low for ≥150ms after recovery. |
| 5 (SET) | Feedback select node | Connected to GND for fixed 1.8V output; open or externally biased for adjustable mode - determines internal feedback path. |
| 6 (OUT) | Regulated output | Delivers 1.8V ±2.0% at up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response and stability. |
| 7–8 / EP | Exposed thermal pad | Internally tied to GND; mandatory connection to PCB ground plane for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset (MR) | Enables system-level reset initiation without external supervisor IC - reduces BOM count and board space in compact designs. |
| 150ms reset timeout | Guarantees sufficient delay for oscillator startup and register initialization in 1.8V microcontrollers before release from reset. |
| 82µA quiescent current | Extends shelf life and runtime in battery-backed applications such as medical sensors or remote IoT nodes operating in deep sleep. |
| Thermal and short-circuit protection | Shuts down pass transistor at 180°C junction temperature with 20°C hysteresis - prevents damage during sustained overload or poor heatsinking. |
| Reverse current blocking | 0.01µA typical OUT-to-IN leakage - avoids backfeeding into depleted batteries or unintended powering of upstream sources during hot-swap events. |
Applications
| Handheld Instruments | Bluetooth Modules |
|---|---|
|
Use Scenario: Powering ARM Cortex-M0+ MCU and analog front-end in portable multimeter with lithium coin cell backup. IC Role / Device Role / Timing Role: Primary 1.8V LDO with MR-initiated calibration reset and brownout detection during battery swap. Use Value: Ensures deterministic boot sequence and prevents corrupted ADC readings during supply transients - validated across -40°C to +85°C industrial range. |
Use Scenario: Regulating 1.8V supply for BLE SoC (e.g., nRF52832) and associated RF front-end in wearable fitness tracker. IC Role / Device Role / Timing Role: Dual-role power manager: delivers clean 1.8V rail and asserts RESET during antenna switching-induced voltage sag. Use Value: Eliminates need for discrete reset IC and saves 1.5mm² PCB area while maintaining <100ns MR-to-RESET propagation delay. |
| PCMCIA Cards | USB Devices |
|
Use Scenario: Providing regulated 1.8V to SmartCard interface controller in PCMCIA expansion card with hot-plug capability. IC Role / Device Role / Timing Role: Hot-swap aware LDO with MR-driven reset to reinitialize secure element after insertion/removal. Use Value: Prevents protocol lockup during partial insertion by asserting RESET within 200ns of MR edge - confirmed per ISO/IEC 7816-3 timing requirements. |
Use Scenario: Supplying 1.8V core voltage to USB 2.0 transceiver and embedded USB PHY in portable dongle. IC Role / Device Role / Timing Role: Input-tolerant regulator that maintains regulation during USB suspend/resume voltage transitions (4.4V–5.25V). Use Value: Achieves <50mV output deviation during 100mA load step - meets USB-IF signal integrity margin for high-speed data lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79918YZTT | 1.8V fixed, 200mA, no MR pin, 300ms reset timeout, 1.2µA IQ in shutdown | Lacks manual reset functionality; requires external MR circuitry for user-triggered reset | Choose when ultra-low shutdown current outweighs need for integrated MR and higher current is not required. |
| ADP162AUJZ-1.8-R7 | 1.8V fixed, 300mA, no reset circuit, 115µA IQ, 120mV dropout @300mA | No built-in reset supervision - necessitates separate supervisor IC (e.g., ADM6315) for power sequencing | Choose when design already includes discrete reset IC or when reset timing is handled by FPGA/ASIC logic. |
Compared with TPS79918YZTT and ADP162AUJZ-1.8-R7, the MAX6471TA18BD3+ uniquely integrates MR-triggered reset supervision with 150ms timeout and 82µA quiescent current in a single 8-pin TDFN, reducing component count and simplifying layout for space-constrained portable systems.
Availability
MAX6471TA18BD3+ is available at Aetrix Electronics and suitable for handheld instruments, Bluetooth modules, PCMCIA cards, USB devices, and digital cameras requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MAX6471TA18BD3+ 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 battery-powered portable equipment needing integrated power regulation and microprocessor reset supervision in minimal footprint - targeting PDA, cellular phone, and wireless module applications.
FAQ
What is the exact output voltage tolerance of the MAX6471TA18BD3+ over temperature?
The MAX6471TA18BD3+ 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 under "Output Voltage Accuracy (Fixed Output Voltage Operation)" for MAX6471–MAX6474 variants. At +25°C, the tighter ±1.1% limit applies, but system-level design must rely on the wider ±2.0% spec for worst-case margining.
Does the MAX6471TA18BD3+ include a shutdown pin?
No, the MAX6471TA18BD3+ does not include a shutdown (SHDN) pin. It belongs to the MAX6471–MAX6474/MAX6479–MAX6482 subgroup, which features Manual Reset (MR) instead of SHDN. Shutdown functionality is absent - power control is achieved only via input voltage removal or external switching on the IN rail.
What is the function of the SET pin on the MAX6471TA18BD3+?
On the MAX6471TA18BD3+, the SET pin selects between fixed and adjustable output modes. When tied to GND, it configures the device for its factory-trimmed 1.8V output. Leaving SET floating or applying external bias enables adjustable operation using an external resistor divider - though for this specific part, fixed 1.8V is the intended use case per ordering suffix "A18".
Can the MAX6471TA18BD3+ drive a 300mA load continuously at 85°C ambient?
Yes, the MAX6471TA18BD3+ guarantees 300mA output current over -40°C to +85°C. However, continuous 300mA operation at +85°C ambient requires proper thermal design: the 8-pin TDFN-EP package has θJA ≈ 41°C/W with adequate PCB copper; power dissipation at 300mA with 3.3V input is ~450mW, resulting in ~110°C junction rise - staying below the +150°C absolute max if ambient is ≤+85°C and thermal pad is fully soldered.
What reset timeout period is implemented in the MAX6471TA18BD3+?
MAX6471TA18BD3+ implements a 150ms minimum reset timeout period, indicated by the "D3" suffix in the part number. This value is guaranteed across temperature and process variation, and the RESET output remains asserted for at least 150ms after VOUT recovers above the -7.5% threshold or after MR returns high.
MAX6471TA18BD3+ 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 (1.8V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- -
- 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)
MAX6471TA18BD3+ FAQ
1.How can I place an order for MAX6471TA18BD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6471TA18BD3+ 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 MAX6471TA18BD3+ reliable?
The price and inventory of MAX6471TA18BD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6471TA18BD3+ is usually 5 days.
3.What payment methods are accepted for MAX6471TA18BD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6471TA18BD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6471TA18BD3+?
MAX6471TA18BD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6471TA18BD3+ 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 MAX6471TA18BD3+?
For technical support, including MAX6471TA18BD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6471TA18BD3+ requirements.
6.How does Aetrix verify that MAX6471TA18BD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6471TA18BD3+ 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 MAX6471TA18BD3+ meets industry standards.
7.What is the process for return or replacement of MAX6471TA18BD3+?
All MAX6471TA18BD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6471TA18BD3+, 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 MAX6471TA18BD3+ part is unused and in its original packaging.
Return procedure for MAX6471TA18BD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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