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Analog Devices Inc./Maxim Integrated MAX1726EUK18
- Part No.:
- MAX1726EUK18
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1726EUK18.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:1,241
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Product details
Overview
MAX1726EUK18 from Maxim Integrated is a fixed-output 1.8V, ultra-low quiescent current (2µA) low-dropout linear regulator in a 5-pin SOT23 package, designed for battery-powered microcontroller and real-time clock backup power systems with input voltage range +2.5V to +12V, ±1.5% output accuracy, and 20mA guaranteed output current.
For engineers reviewing the MAX1726EUK18 datasheet, MAX1726EUK18 pinout, MAX1726EUK18 application, or MAX1726EUK18 equivalent, this page delivers verified technical context, validated pin functions, confirmed application use cases in smoke detectors and smart battery packs, and two rigorously cross-referenced alternative regulators with documented functional and packaging differences.
Technical Context
The MAX1726EUK18 integrates a p-channel MOSFET pass transistor and a 1.245V internal reference error amplifier to achieve stable 1.8V regulation without external feedback components. Its shutdown logic accepts active-low control on SHDN, reducing supply current to 0.7µA while disconnecting the output.
Reverse-battery protection limits reverse input current to <10µA by isolating internal circuitry when VIN goes below ground, and thermal shutdown activates at +150°C with 15°C hysteresis to enable pulsed recovery under overload-both features implemented via dedicated on-die sensors and analog control paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% over -40°C to +85°C - ensures stable core voltage for low-power MCUs without trimming. |
| Quiescent Current | 2µA typical across full input range and load - extends battery life in always-on sensor nodes. |
| Input Voltage Range | +2.5V to +12V - supports dual Li+ cells (up to 8.4V) and 9V alkaline batteries directly. |
| Dropout Voltage | 600mV max at 20mA load - enables regulation down to VIN = 2.4V for 1.8V output. |
| Output Capacitor | 1µF ceramic minimum - allows compact, low-ESR stability without tantalum or large electrolytics. |
| Protection Features | Reverse-battery (<10µA leakage), short-circuit (foldback to 40mA), thermal shutdown (+150°C) - eliminates need for external protection circuitry. |
Pinout & Package
MAX1726EUK18 is housed in a RoHS-compliant 5-pin SOT23 package (outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for automated reflow assembly and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input Supply Rail | Accepts +2.5V to +12V; connects to input capacitor and upstream source; reverse-battery protection active here. |
| 2 - GND | Analog & Power Ground | Common return for all internal circuitry; must be low-impedance connection to system ground plane. |
| 3 - OUT | Regulated Output | Delivers fixed 1.8V ±1.5%; requires ≥1µF ceramic capacitor to ground for stability and transient response. |
| 4 - GND | Second Ground Terminal | Dedicated ground path for output stage; improves PSRR and reduces ground bounce under load steps. |
| 5 - SHDN | Active-Low Enable | Pulled high to IN for normal operation; driven <0.5V to enter shutdown mode (IIN = 0.7µA). |
Key Features
| Feature | Design Value |
|---|---|
| p-Channel Pass Transistor | Eliminates base-drive current, enabling 2µA IQ in dropout and full-load conditions - critical for multi-year battery life. |
| Internal Fixed Feedback | 1.245V reference with factory-trimmed resistor divider delivers exact 1.8V output - no external resistors required. |
| Reverse-Battery Protection | Active isolation prevents >10µA reverse current when VIN < 0V - protects battery, load, and IC during incorrect insertion. |
| Thermal Shutdown Hysteresis | 15°C hysteresis between +150°C trip and +135°C recovery - enables safe, self-limiting operation during sustained overload. |
Applications
| Smoke Detectors | Remote Transmitters |
|---|---|
Use Scenario: Standby power for electrochemical CO/smoke sensing circuitry operating continuously on 9V alkaline battery. IC Role / Device Role / Timing Role: Primary 1.8V supply for ultra-low-power MCU and analog front-end during sleep and wake cycles. Use Value: 2µA quiescent current enables >10-year battery life; 1.8V output matches low-voltage MCU core requirements. | Use Scenario: Battery-powered wireless sensor node transmitting temperature/humidity data every 5 minutes via sub-GHz RF link. IC Role / Device Role / Timing Role: Stable 1.8V rail for RF transceiver and microcontroller during transmit bursts and deep-sleep intervals. Use Value: 1µF output capacitor ensures fast load-transient response to 20mA RF transmit pulses without voltage droop. |
| Smart Battery Packs | Real-Time Clock Backup Power |
Use Scenario: Power management IC inside Li-ion pack providing fuel-gauge MCU and protection circuitry with precise voltage reference. IC Role / Device Role / Timing Role: Dedicated 1.8V supply for gas-gauge ASIC and EEPROM, isolated from main pack voltage fluctuations. Use Value: ±1.5% output accuracy maintains calibration integrity; reverse-battery protection safeguards during pack servicing. | Use Scenario: Maintaining RTC and SRAM state during main system power loss using coin-cell or supercapacitor backup. IC Role / Device Role / Timing Role: Low-IQ 1.8V regulator feeding RTC oscillator and memory retention circuitry. Use Value: 2µA IQ minimizes drain on backup source; 2.5V–12V input range accommodates wide supercap voltage decay. |
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 |
|---|---|---|---|
| TPS78218DRVR | 2.2µA IQ, 1.8V fixed, SOT23-5, but requires 2.2µF min COUT and lacks reverse-battery protection. | Suitable for space-constrained industrial sensors where reverse polarity risk is absent. | Select when higher PSRR (>65dB @ 1kHz) is prioritized over reverse-battery safety. |
| MCP1700T-1802E/TT | 1.6µA IQ, 1.8V fixed, SOT23-3 (3-pin), no SHDN pin or thermal shutdown. | Fits cost-sensitive consumer devices with simple ON/OFF control and no thermal stress risk. | Choose only if shutdown control and thermal protection are not required in the design. |
Compared with TPS78218DRVR and MCP1700T-1802E/TT, the MAX1726EUK18 uniquely combines ultra-low 2µA IQ, integrated reverse-battery protection, thermal shutdown with hysteresis, and active shutdown control-all in the same 5-pin SOT23 footprint-making it optimal for safety-critical, long-life battery systems.
Availability
MAX1726EUK18 is available at Aetrix Electronics and suitable for smoke detectors, remote transmitters, and smart battery packs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX1726EUK18 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, medical, and battery-powered applications.
The MAX1725/MAX1726 product line was engineered specifically for ultra-low-power battery regulation-emphasizing sub-µA shutdown, reverse-polarity resilience, and minimal external component count in miniature packages.
FAQ
What is the maximum input voltage rating for MAX1726EUK18?
The MAX1726EUK18 has an absolute maximum input voltage rating of +14V, but its specified operating input range is +2.5V to +12V. Operation above +12V may cause permanent damage or violate electrical specifications, even if within absolute maximum limits. For reliable performance, keep VIN ≤ +12V per the datasheet's Electrical Characteristics table.
Does MAX1726EUK18 require an external feedback resistor network?
No, the MAX1726EUK18 does not require external feedback resistors. It uses an internal factory-trimmed resistor divider to deliver a precise fixed 1.8V output. Unlike the adjustable MAX1725, the MAX1726EUK18 integrates all feedback components internally - simplifying layout and eliminating resistor tolerance errors.
Can MAX1726EUK18 be used with a 1µF ceramic output capacitor?
Yes, the MAX1726EUK18 is fully stable with a minimum 1µF ceramic output capacitor, as confirmed in the Applications Information section and Typical Operating Characteristics. This value ensures adequate phase margin across -40°C to +85°C and supports fast load-transient response without oscillation or overshoot.
What happens to the output during MAX1726EUK18 shutdown?
When the SHDN pin is driven below 0.5V, the MAX1726EUK18 disables its pass transistor and actively pulls the OUT pin to ground through an internal switch. The output voltage collapses to near 0V, and supply current drops from 2µA to 0.7µA - ensuring zero standby power draw from the load during shutdown.
Is MAX1726EUK18 compatible with reverse-polarity battery connections?
Yes, the MAX1726EUK18 includes built-in reverse-battery protection that limits reverse input current to less than 10µA when VIN is forced below ground. This feature isolates internal circuitry and parasitic paths, preventing damage to the IC, battery, or downstream load - provided SHDN is driven through a 100kΩ resistor as recommended.
MAX1726EUK18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for MAX1726EUK18 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1726EUK18 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 reliable?
The price and inventory of MAX1726EUK18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1726EUK18 is usually 5 days.
3.What payment methods are accepted for MAX1726EUK18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1726EUK18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1726EUK18?
MAX1726EUK18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1726EUK18 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?
For technical support, including MAX1726EUK18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1726EUK18 requirements.
6.How does Aetrix verify that MAX1726EUK18 is sourced from the original manufacturer or authorized distributors?
All MAX1726EUK18 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 meets industry standards.
7.What is the process for return or replacement of MAX1726EUK18?
All MAX1726EUK18 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1726EUK18, 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 part is unused and in its original packaging.
Return procedure for MAX1726EUK18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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