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Analog Devices Inc./Maxim Integrated MAX6473TA18BD3+
- Part No.:
- MAX6473TA18BD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6473TA18BD3+.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,732
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Product details
Overview
MAX6473TA18BD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 1.8V output voltage, -12.5% reset threshold accuracy (suffix 'A'), and 150ms minimum reset timeout (suffix 'D3'). It features 82µA quiescent current, 55mV dropout at 150mA, and active-low push-pull RESET output. Designed for battery-powered portable equipment including Bluetooth modules and digital cameras.
For engineers reviewing the MAX6473TA18BD3+ datasheet, MAX6473TA18BD3+ pinout, MAX6473TA18BD3+ application, or MAX6473TA18BD3+ equivalent, key selection considerations include its shutdown capability (0.1µA typ), ±2.0% output voltage accuracy over temperature, integrated reset supervision eliminating external supervisors, and compatibility with 2.5V–5.5V input range in compact 8-pin TDFN-EP package.
Technical Context
The MAX6473TA18BD3+ integrates an LDO regulator core and a precision reset supervisor sharing the same reference voltage. Its regulator operates across 2.5V–5.5V input, delivers up to 300mA with guaranteed dropout of 114mV at full load, and maintains ±2.0% output accuracy from –40°C to +85°C. The reset circuit asserts active-low RESET when VOUT falls below 87.5% of nominal (1.575V at 1.8V), with built-in 150ms timeout and undervoltage lockout at 2.25V (min).
This device belongs to the MAX6473–MAX6474 variant group, featuring SHDN (active-low shutdown) and RESET (push-pull) pins but no MR (manual reset) or FB (remote sense) functionality. It uses the SET pin for fixed-output mode (SET = GND) and includes reverse current protection (0.01µA OUT→IN leakage), thermal shutdown at 180°C, and internal current limiting (450mA min).
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. |
| Max Output Current | 300mA guaranteed - sufficient for mid-power SoCs and peripheral ICs in portable systems. |
| Dropout Voltage | 55mV at 150mA - enables operation from single-cell Li-ion (3.0V min) while maintaining regulation down to 1.855V input. |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring or sleep-mode applications. |
| Reset Threshold | –12.5% of VOUT (1.575V at 1.8V) with ±2.5% tolerance - meets standard microprocessor supply tolerance requirements. |
| Reset Timeout | 150ms minimum - provides adequate stabilization time for clock oscillators and processor power rails before release. |
| Shutdown Current | 0.1µA typical - enables ultra-low-power system suspend states without external disconnect switches. |
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, dual-cell alkaline, and USB-powered operation. |
Pinout & Package
MAX6473TA18BD3+ is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.75mm height) package with exposed paddle (EP) internally connected to GND. Thermal performance is optimized by soldering EP to PCB ground plane.
| 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. |
| 2 (GND) | Ground / Thermal Pad | Primary electrical ground and main thermal dissipation path; must connect to large copper area. |
| 3 (SHDN) | Active-Low Shutdown Control | Pulled high to IN for normal operation; pulling low disables regulator and reduces IQ to 0.1µA. |
| 4 (RESET) | Active-Low Push-Pull Reset Output | Drives low during power-up, brownout, or shutdown; remains low for ≥150ms after VOUT stabilizes. |
| 5 (SET) | Feedback Reference Input | Connected to GND for fixed 1.8V output; not used for adjustable configuration in this variant. |
| 6 (OUT) | Regulated Output | Delivers 1.8V/300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response. |
| 7, 8 (EP) | Exposed Paddle | Internally tied to GND; mandatory connection to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Microprocessor Reset | Eliminates need for external supervisor IC by providing precise, temperature-stable reset assertion at –12.5% VOUT with 150ms timeout. |
| Ultra-Low Quiescent Current | 82µA operating / 0.1µA shutdown - enables multi-year battery life in IoT sensors and wearables. |
| Low Dropout Performance | 55mV at 150mA - allows efficient use of depleting battery voltage without premature cutoff. |
| Robust Protection Suite | Includes thermal shutdown (180°C), short-circuit current limit (450mA min), and reverse current blocking (0.01µA OUT→IN). |
| Compact Thermally Enhanced Package | 8-pin TDFN-EP (3×3mm) with exposed paddle - achieves 24.4mW/°C thermal derating and 1951mW max dissipation at +70°C. |
| Input Voltage Flexibility | 2.5V–5.5V operating range - supports diverse sources including USB, coin cells (with boost), and single Li-ion batteries. |
Applications
| Handheld Instruments | Bluetooth Modules |
|---|---|
|
Use Scenario: Power management in handheld test meters with LCD display and wireless telemetry. IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying microcontroller core and BLE radio interface, with integrated reset ensuring clean boot sequence. Use Value: Eliminates discrete reset IC and saves board space; 82µA IQ extends alkaline battery life beyond 12 months in low-duty-cycle logging. |
Use Scenario: Compact Bluetooth audio transmitter with embedded DSP and RF front-end. IC Role / Device Role / Timing Role: Regulates 1.8V supply for baseband processor and BLE controller; RESET synchronizes firmware initialization with crystal oscillator stabilization. Use Value: 150ms reset timeout guarantees reliable oscillator startup before CPU execution; TDFN-EP package fits tight 10mm × 10mm module footprint. |
| Digital Cameras | PCMCIA Cards |
|
Use Scenario: Image sensor and ISP power rail in ultra-thin point-and-shoot camera. IC Role / Device Role / Timing Role: Supplies regulated 1.8V to CMOS image sensor interface and video processing ASIC; SHDN enables rapid power cycling between capture bursts. Use Value: 55mV dropout preserves headroom from 3.0V Li-ion battery, enabling >95% usable capacity; thermal shutdown prevents overheating during continuous video recording. |
Use Scenario: Power conditioning for legacy PCMCIA Wi-Fi card operating from laptop slot voltage (3.3V). IC Role / Device Role / Timing Role: Steps down 3.3V slot supply to 1.8V for WLAN chipset; RESET monitors local rail and asserts on brownout to prevent data corruption. Use Value: ±2.0% output accuracy ensures compliance with JEDEC JESD8-12B 1.8V I/O spec; 0.1µA shutdown current avoids parasitic drain when card is ejected. |
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 LDO only (no reset circuit); 170mA max output; 2.7V–6.5V input; 200nA shutdown current. | Requires external reset supervisor (e.g., TPS3808G18) for µP reset functionality. | Select when lowest possible shutdown current is critical and board space permits two ICs. |
| MAX6475TA18BD3+ | Same 1.8V/300mA LDO + reset, but replaces SET with FB pin for remote sensing; no SHDN pin. | Designed for high-current applications using external NPN pass transistor; lacks shutdown control. | Select when driving >300mA loads via external transistor and shutdown is managed elsewhere in system. |
Compared with MAX6473TA18BD3+, TPS79918YZTT offers lower shutdown current but adds BOM complexity and layout area for external reset, while MAX6475TA18BD3+ trades shutdown capability for remote-sense flexibility-making MAX6473TA18BD3+ optimal for space-constrained, battery-powered systems requiring integrated supervision and low-IQ shutdown.
Availability
MAX6473TA18BD3+ is available at Aetrix Electronics and suitable for handheld instruments, Bluetooth modules, digital cameras, PCMCIA cards, and notebook computer subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6473TA18BD3+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
MAX6473TA18BD3+ belongs to the MAX6469–MAX6484 family of integrated LDO regulators with microprocessor reset, designed specifically for battery-powered portable equipment where space, power efficiency, and supply supervision reliability are critical.
FAQ
What is the output voltage tolerance and temperature drift of the MAX6473TA18BD3+?
The MAX6473TA18BD3+ delivers a fixed 1.8V output with ±2.0% accuracy over the full –40°C to +85°C operating temperature range. This specification is guaranteed across load (1mA–300mA) and line (2.5V–5.5V input) variations, ensuring reliable operation for 1.8V logic interfaces without external trimming or calibration. The MAX6473TA18BD3+ uses a precision bandgap reference and laser-trimmed feedback resistors to achieve this stability.
Does the MAX6473TA18BD3+ support active-low shutdown, and what is its shutdown current?
Yes, the MAX6473TA18BD3+ features an active-low SHDN pin (Pin 3). When pulled low, it disables the regulator and reduces total supply current to 0.1µA (typical) at +25°C. This ultra-low shutdown current enables deep-sleep modes in battery-powered devices. The MAX6473TA18BD3+ must be ordered with 'TA' prefix to confirm TDFN-EP package and SHDN functionality - which applies to this exact part number.
What reset timeout period and threshold does the MAX6473TA18BD3+ implement?
The MAX6473TA18BD3+ implements a 150ms minimum reset timeout (suffix 'D3') and a –12.5% reset threshold (suffix 'A'), meaning RESET asserts when VOUT drops below 1.575V and remains asserted for ≥150ms after recovery. This matches standard microprocessor supply tolerance requirements and ensures clock oscillators stabilize before CPU release. The MAX6473TA18BD3+ uses push-pull RESET output with VOL ≤ 0.4V at 3.2mA sink.
Can the MAX6473TA18BD3+ be used with input voltages below 2.5V?
No - the MAX6473TA18BD3+ has a minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Below 2.5V, the regulator cannot maintain regulation or guarantee reset functionality. Its undervoltage lockout triggers at 2.25V (min), disabling output and asserting RESET. For sub-2.5V operation, consider alternative LDOs such as the MAX1725 (1.8V out, 1.6V min IN), but note those lack integrated reset.
Is the MAX6473TA18BD3+ RoHS-compliant and lead(Pb)-free?
Yes, the MAX6473TA18BD3+ is RoHS-compliant and lead(Pb)-free. The '+' suffix in the part number explicitly denotes lead-free/RoHS-compliant packaging per Maxim's ordering guide. It uses matte-tin plating and meets JEDEC J-STD-020D reflow profile requirements, including peak temperature of +260°C for lead-free soldering. The TDFN-EP package contains no lead-based solder or finishes.
MAX6473TA18BD3+ 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, 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)
MAX6473TA18BD3+ FAQ
1.How can I place an order for MAX6473TA18BD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6473TA18BD3+ 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 MAX6473TA18BD3+ reliable?
The price and inventory of MAX6473TA18BD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6473TA18BD3+ is usually 5 days.
3.What payment methods are accepted for MAX6473TA18BD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6473TA18BD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6473TA18BD3+?
MAX6473TA18BD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6473TA18BD3+ 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 MAX6473TA18BD3+?
For technical support, including MAX6473TA18BD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6473TA18BD3+ requirements.
6.How does Aetrix verify that MAX6473TA18BD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6473TA18BD3+ 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 MAX6473TA18BD3+ meets industry standards.
7.What is the process for return or replacement of MAX6473TA18BD3+?
All MAX6473TA18BD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6473TA18BD3+, 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 MAX6473TA18BD3+ part is unused and in its original packaging.
Return procedure for MAX6473TA18BD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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