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Analog Devices Inc./Maxim Integrated MAX1726EUK18+T
- Part No.:
- MAX1726EUK18+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1726EUK18+T.pdf
- Description:
- IC REG LINEAR 1.8V 20MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,170
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Product details
Overview
MAX1726EUK18+T from Maxim Integrated is a fixed-output, ultra-low quiescent current (2µA), low-dropout linear regulator delivering 1.8V at up to 20mA with ±1.5% output voltage accuracy over -40°C to +85°C. It features reverse-battery protection, thermal shutdown, and foldback current limiting, and is designed for microcontroller power and real-time clock backup in battery-powered smoke detectors and remote transmitters.
For engineers reviewing the MAX1726EUK18+T datasheet, MAX1726EUK18+T pinout, MAX1726EUK18+T application, or MAX1726EUK18+T equivalent, key selection criteria include guaranteed 20mA output under 2.5V–12V input, 1µF minimum output capacitance stability, SOT23-5 package footprint, and shutdown supply current of 0.7µA - all critical for long-life, space-constrained portable systems.
Technical Context
The MAX1726EUK18+T uses an internal p-channel MOSFET pass transistor with a 1.245V reference error amplifier, enabling ultra-low IQ across full load and dropout conditions. Its fixed 1.8V output is achieved via on-die resistor divider - no external feedback components required.
Shutdown is active-low (VIL = 0.5V max), reducing supply current to 0.7µA while pulling output to ground. Thermal protection activates at +150°C with 15°C hysteresis, and foldback current limiting caps short-circuit current at ~40mA (typ) without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% - ensures stable core logic supply for 1.8V microcontrollers without external resistors. |
| Quiescent Current | 2µA typical - enables multi-year battery life in always-on sensors and RTC backup circuits. |
| Input Voltage Range | +2.5V to +12V - supports two Li+ cells (up to 8.4V) and 9V alkaline batteries directly. |
| Max Output Current | 20mA - sufficient for low-power MCUs, RTCs, and sensor interfaces with margin. |
| Dropout Voltage | 600mV max at 20mA - maintains regulation down to VIN = 2.4V for 1.8V output. |
| Output Capacitor | 1µF min ceramic - enables compact, stable layout without ESR constraints or large bulk caps. |
| Shutdown Current | 0.7µA max - reduces system standby power to sub-microwatt levels. |
Pinout & Package
MAX1726EUK18+T is housed in a RoHS-compliant 5-pin SOT23 package (outline 21-0057), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for high-density PCB layouts in portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input Supply | Accepts +2.5V to +12V; reverse-battery protected to -14V. |
| 2 - GND | Ground Reference | Common return for input, output, and internal circuitry; dual GND pins improve thermal and noise performance. |
| 3 - OUT | Regulated Output | Delivers fixed 1.8V; requires ≥1µF ceramic capacitor to ground for stability. |
| 4 - GND | Ground Reference | Second ground connection - must be tied to same net as Pin 2 for optimal thermal dissipation and PSRR. |
| 5 - SHDN | Active-Low Enable | Pull ≤0.5V to disable regulator; connect to IN for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 2µA quiescent current | Maintains battery runtime >10 years in 20µA average-load smoke detectors using CR2032. |
| Reverse-battery protection | Limits reverse input current to <10µA - prevents damage when battery is inserted backward in field-replaceable units. |
| Thermal shutdown with hysteresis | Shuts down at +150°C and re-enables at +135°C - enables safe intermittent operation under sustained overload. |
| 1.5% output voltage accuracy | Meets tight tolerance requirements for 1.8V I/O domains in modern low-voltage MCUs without calibration. |
| 1µF output capacitor stability | Eliminates need for specialized low-ESR tantalum or polymer caps - reduces BOM cost and improves reliability. |
Applications
| Smoke Detectors | Remote Transmitters |
|---|---|
Use Scenario: Standby power for electrochemical CO sensor and MCU in battery-operated residential smoke alarms. IC Role / Device Role / Timing Role: Primary 1.8V supply for ultra-low-power ARM Cortex-M0+ MCU and analog front-end during 10-year shelf life. Use Value: 2µA IQ extends CR123A battery life beyond 10 years in sleep mode while maintaining fast wake-up response. | Use Scenario: Powering sub-GHz RF transmitter IC and microcontroller in wireless industrial sensor nodes. IC Role / Device Role / Timing Role: Stable 1.8V rail for RF IC bias and digital logic during brief 50ms transmit bursts. Use Value: 600mV dropout allows reliable operation down to 2.4V battery voltage, maximizing usable cell capacity. |
| Smart Battery Packs | Real-Time Clock Backup Power |
Use Scenario: Supplying fuel-gauge IC and protection controller in Li-ion battery packs with embedded monitoring. IC Role / Device Role / Timing Role: Always-on 1.8V source for battery management system (BMS) during storage and transport. Use Value: Reverse-battery protection prevents damage during pack assembly or accidental polarity reversal in multi-cell stacks. | Use Scenario: Maintaining timekeeping in embedded systems during main power loss (e.g., industrial PLCs, medical devices). IC Role / Device Role / Timing Role: Dedicated low-IQ backup regulator for RTC crystal oscillator and SRAM retention. Use Value: 0.7µA shutdown current minimizes drain on coin-cell backup batteries, extending calendar life to >5 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent-current LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS78018DRVR | 200nA IQ, 1.8V fixed, 150mA output - lower IQ but higher max current and larger 6-pin WSON package. | Suitable for higher-current IoT edge nodes; not drop-in due to different pinout and thermal pad. | Select if <1µA standby current is mandatory and board area allows WSON-6. |
| MCP1700T-1802E/MB | 1.6µA IQ, 1.8V fixed, 250mA output - higher current capability but ±2% accuracy and no reverse-battery protection. | Better for cost-sensitive consumer devices where reverse polarity risk is mitigated externally. | Choose when higher output current is needed and reverse-battery protection is handled at system level. |
Compared with TPS78018DRVR and MCP1700T-1802E/MB, the MAX1726EUK18+T offers superior reverse-battery protection and tighter 1.5% accuracy in the smallest SOT23-5 footprint - making it optimal for safety-critical, space-constrained, and long-life battery applications where system-level protection is impractical.
Availability
MAX1726EUK18+T is available at Aetrix Electronics and suitable for smoke detectors, remote transmitters, and real-time clock backup power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1726EUK18+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 industrial, automotive, and computing applications.
The MAX1725/MAX1726 product line delivers ultra-low-IQ LDO regulators specifically for battery-powered systems demanding multi-year operation, including safety-critical sensors and portable instrumentation.
FAQ
What is the maximum input voltage rating for MAX1726EUK18+T?
The MAX1726EUK18+T has an absolute maximum input voltage of +14V, but its operational input range is specified from +2.5V to +12V. Exceeding +12V may cause excessive power dissipation or thermal shutdown, while operation below +2.5V fails to maintain regulation. The device also withstands -14V input for reverse-battery conditions without damage.
Does MAX1726EUK18+T require an external feedback resistor network?
No, MAX1726EUK18+T does not require external feedback resistors. It integrates a factory-trimmed resistor divider to deliver a fixed 1.8V output. Unlike the adjustable MAX1725 variant, the MAX1726EUK18+T uses internal feedback - simplifying layout and eliminating resistor tolerance errors that affect output accuracy.
Can MAX1726EUK18+T be used with a 1µF ceramic output capacitor?
Yes, MAX1726EUK18+T is explicitly characterized and guaranteed stable with a minimum 1µF ceramic output capacitor - no ESR requirements or damping networks needed. This enables use of low-cost, small-footprint X5R/X7R MLCCs and eliminates design uncertainty associated with capacitor selection in space-constrained applications.
What happens to the output of MAX1726EUK18+T during shutdown?
When the SHDN pin is pulled low (<0.5V), the MAX1726EUK18+T disables its pass transistor and actively pulls the OUT pin to ground via an internal switch. This ensures the downstream circuit is fully de-energized - critical for preventing leakage paths or unintended wake-up in battery-powered systems. Output voltage drops to <10mV within microseconds.
Is MAX1726EUK18+T qualified for automotive applications?
No, MAX1726EUK18+T is rated for -40°C to +85°C operation and is not AEC-Q200 qualified. For automotive use, Maxim offers the MAX1726EUK18/V+T variant (with "/V" suffix), which undergoes additional stress testing and screening per automotive standards. The standard MAX1726EUK18+T is intended for industrial, medical, and consumer portable equipment.
MAX1726EUK18+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 20mA
- Current - Quiescent (Iq):
- 4.5 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- 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:
- SOT-23-5
MAX1726EUK18+T FAQ
1.How can I place an order for MAX1726EUK18+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1726EUK18+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 MAX1726EUK18+T reliable?
The price and inventory of MAX1726EUK18+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1726EUK18+T is usually 5 days.
3.What payment methods are accepted for MAX1726EUK18+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1726EUK18+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1726EUK18+T?
MAX1726EUK18+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1726EUK18+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 MAX1726EUK18+T?
For technical support, including MAX1726EUK18+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1726EUK18+T requirements.
6.How does Aetrix verify that MAX1726EUK18+T is sourced from the original manufacturer or authorized distributors?
All MAX1726EUK18+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 MAX1726EUK18+T meets industry standards.
7.What is the process for return or replacement of MAX1726EUK18+T?
All MAX1726EUK18+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1726EUK18+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 MAX1726EUK18+T part is unused and in its original packaging.
Return procedure for MAX1726EUK18+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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