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Analog Devices Inc./Maxim Integrated MAX1726EUK18+TG035
- Part No.:
- MAX1726EUK18+TG035
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX1726EUK18+TG035.pdf
- Description:
- IC REG LINEAR 1.8V 20MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,355
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Product details
Overview
MAX1726EUK18+TG035 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, short-circuit foldback limiting, and operates from 2.5V to 12V input-ideal for smoke detector main power and real-time clock backup in dual-Li+ or 9V battery systems.
For engineers reviewing the MAX1726EUK18+TG035 datasheet, MAX1726EUK18+TG035 pinout, MAX1726EUK18+TG035 application, or MAX1726EUK18+TG035 equivalent, key selection criteria include guaranteed 20mA output under 2µA IQ, 1µF minimum output capacitance stability, SOT23-5 package footprint compatibility, and factory-trimmed 1.8V output without external feedback components.
Technical Context
The MAX1726EUK18+TG035 uses an internal p-channel MOSFET pass transistor with a 1.245V reference error amplifier, enabling ultra-low dropout operation and eliminating base-drive current losses typical of PNP regulators. Its shutdown logic responds to SHDN < 0.5V, reducing supply current to 0.7µA while disconnecting OUT from GND.
Thermal protection activates at +150°C junction temperature with 15°C hysteresis, causing pulsed output during sustained overload; reverse-battery protection limits VIN < 0V current to <10µA when SHDN is driven via 100kΩ resistor-critical for field-replaceable battery compartments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% - factory-trimmed, no external resistors required |
| Quiescent Current | 2µA over full load and temperature range - enables multi-year battery life in always-on sensors |
| Input Voltage Range | +2.5V to +12V - supports two Li+ cells (up to 8.4V) and standard 9V alkaline batteries |
| Dropout Voltage | 600mV at 20mA (TA = +25°C) - maintains regulation down to VIN = 2.4V for 1.8V output |
| Output Capacitor | 1µF ceramic - ensures stable transient response without ESR requirements |
| Protection Features | Reverse-battery (<10µA leakage), thermal shutdown (+150°C), short-circuit foldback (40mA typ) |
| Operating Temp | -40°C to +85°C - qualified for industrial and alarm system environments |
Pinout & Package
MAX1726EUK18+TG035 is housed in a RoHS-compliant 5-pin SOT23 package (outline 21-0057, land pattern 90-0174), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. The top mark is ADNL.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Supply | Accepts +2.5V to +12V; reverse-battery protected when SHDN biased via 100kΩ |
| 2 (GND) | Ground Reference | Common return for IN, OUT, SHDN; connects internally to exposed pad (if present) |
| 3 (OUT) | Regulated Output | Delivers fixed 1.8V; requires ≥1µF ceramic capacitor to GND for stability |
| 4 (GND) | Second Ground Terminal | Reduces ground path impedance; must be connected to same GND plane as Pin 2 |
| 5 (SHDN) | Active-Low Enable | Pulled high to IN for normal operation; driven <0.5V to enter 0.7µA shutdown mode |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ architecture | 2µA supply current maintained across full load, input, and temperature range-no increase in dropout |
| Integrated reverse-battery protection | Blocks conduction and limits reverse current to <10µA without external diodes or FETs |
| Thermal shutdown with hysteresis | Turns off output at +150°C junction temp; auto-restarts after 15°C cooldown-prevents latch-up during overload |
| Factory-trimmed 1.8V output | Eliminates external feedback network, reduces BOM count, and guarantees ±1.5% accuracy without calibration |
| Low-ESR capacitor compatibility | Stable with 1µF ceramic output cap-no tantalum or aluminum electrolytic required for reliability |
Applications
| Smoke Detectors | Remote Transmitters |
|---|---|
Use Scenario: Primary power supply for optical or ionization smoke sensing circuitry operating continuously on 9V alkaline battery. IC Role / Device Role / Timing Role: Main 1.8V rail generator for microcontroller, analog front-end, and buzzer driver. Use Value: 2µA quiescent current extends battery life beyond 10 years in standby; reverse-battery protection prevents damage during battery replacement. | Use Scenario: Power source for sub-GHz RF transmitters in wireless security sensors deployed in unattended outdoor locations. IC Role / Device Role / Timing Role: Stable 1.8V supply for RF IC and MCU during brief transmission bursts. Use Value: 1µF output capacitor ensures fast load-transient recovery (<400µs) between sleep and transmit modes without voltage droop. |
| Smart Battery Packs | Real-Time Clock Backup Power |
Use Scenario: Auxiliary voltage regulator inside lithium-ion battery packs for fuel-gauge IC and protection circuitry. IC Role / Device Role / Timing Role: Dedicated 1.8V supply isolated from main pack voltage, active during charging and discharging. Use Value: Input range down to 2.5V allows operation even when pack voltage sags below 3V; thermal shutdown prevents overheating during fault conditions. | Use Scenario: Backup regulator for RTC and SRAM in industrial controllers during main power failure. IC Role / Device Role / Timing Role: Low-power 1.8V source fed from coin cell or supercapacitor when VIN drops below 2.5V. Use Value: Guaranteed 20mA output sustains RTC functionality during brownout; 2µA IQ minimizes backup energy drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-IQ LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS78018DRVR | 1.8V fixed, 500nA IQ, 200mA output, WSON-6 package | Higher output current but larger footprint; lacks reverse-battery protection | Select when >20mA load or ultra-deep sleep (<1µA) is required; verify PCB layout supports WSON-6 |
| MCP1700T-1802E/TT | 1.8V fixed, 1.6µA IQ, 250mA output, SOT23-3 package | 3-pin package (no separate GND pins); no reverse-battery or thermal shutdown | Select for cost-sensitive designs where protection features are handled externally; confirm stability with 1µF cap |
Compared with TPS78018DRVR and MCP1700T-1802E/TT, the MAX1726EUK18+TG035 uniquely combines 2µA IQ, reverse-battery protection, thermal shutdown, and dual-GND SOT23-5 packaging-making it optimal for safety-critical, battery-replaceable systems where board space and protection integration are constrained.
Availability
MAX1726EUK18+TG035 is available at Aetrix Electronics and suitable for smoke detectors, remote transmitters, and real-time clock backup power systems requiring stable component supply, long-lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX1726EUK18+TG035 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 delivers ultra-low-IQ LDOs optimized for multi-year battery life in safety-critical and portable systems-emphasizing protection integration, minimal external components, and wide input voltage tolerance.
FAQ
What is the guaranteed output current capability of the MAX1726EUK18+TG035?
The MAX1726EUK18+TG035 guarantees 20mA output current across its full operating temperature range (-40°C to +85°C) and input voltage range (+2.5V to +12V). This rating is validated under worst-case conditions including dropout and thermal stress, ensuring reliable performance in battery-powered smoke detectors and remote sensors where load transients occur.
Does the MAX1726EUK18+TG035 require an external feedback resistor network?
No, the MAX1726EUK18+TG035 does not require external feedback resistors. It is a factory-trimmed fixed-output regulator delivering 1.8V ±1.5%, with internal resistor division connected directly between OUT and GND. This eliminates BOM items and layout complexity compared to adjustable regulators like the MAX1725, simplifying design for space-constrained applications such as smart battery packs.
How does reverse-battery protection function in the MAX1726EUK18+TG035?
The MAX1726EUK18+TG035 limits reverse supply current to <10µA when VIN is forced below ground by monitoring polarity and disconnecting internal circuitry and parasitic paths. To activate this feature, SHDN must be driven through a 100kΩ resistor rather than tied directly to IN. This protects both the IC and battery during incorrect insertion in field-serviceable devices like smoke alarms.
What is the minimum output capacitance required for stable operation of the MAX1726EUK18+TG035?
The MAX1726EUK18+TG035 requires a minimum 1µF ceramic output capacitor connected between OUT and GND for guaranteed stability across -40°C to +85°C. Unlike many LDOs, it imposes no ESR constraints-enabling use of low-cost, high-reliability X7R or C0G ceramics without risk of oscillation, which is essential for long-life industrial and alarm system deployments.
Can the MAX1726EUK18+TG035 be used with a 9V alkaline battery?
Yes, the MAX1726EUK18+TG035 supports input voltages from +2.5V to +12V, making it fully compatible with standard 9V alkaline batteries across their entire discharge curve (≈9.5V fresh to ≈4.5V end-of-life). Its 600mV dropout at 20mA ensures continuous 1.8V regulation until the battery drops below 2.4V-providing maximum usable energy extraction in battery-powered alarms and transmitters.
MAX1726EUK18+TG035 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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+TG035 FAQ
1.How can I place an order for MAX1726EUK18+TG035 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1726EUK18+TG035 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+TG035 reliable?
The price and inventory of MAX1726EUK18+TG035 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1726EUK18+TG035 is usually 5 days.
3.What payment methods are accepted for MAX1726EUK18+TG035?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1726EUK18+TG035 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1726EUK18+TG035?
MAX1726EUK18+TG035 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1726EUK18+TG035 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+TG035?
For technical support, including MAX1726EUK18+TG035 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1726EUK18+TG035 requirements.
6.How does Aetrix verify that MAX1726EUK18+TG035 is sourced from the original manufacturer or authorized distributors?
All MAX1726EUK18+TG035 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+TG035 meets industry standards.
7.What is the process for return or replacement of MAX1726EUK18+TG035?
All MAX1726EUK18+TG035 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1726EUK18+TG035, 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+TG035 part is unused and in its original packaging.
Return procedure for MAX1726EUK18+TG035:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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