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Analog Devices Inc./Maxim Integrated MAX8881EUT18+T
- Part No.:
- MAX8881EUT18+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX8881EUT18+T.pdf
- Description:
- IC REG LINEAR 1.8V 200MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,158
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Product details
Overview
MAX8881EUT18+T from Maxim Integrated is a 1.8V fixed-output, ultra-low-quiescent-current (3.5µA) low-dropout linear regulator with power-ok (POK) output and reverse battery protection, delivering up to 200mA in a 6-pin SOT23 package. It targets battery-powered systems requiring long standby life, such as smoke detectors and smart battery packs.
For engineers reviewing the MAX8881EUT18+T datasheet, MAX8881EUT18+T pinout, MAX8881EUT18+T application, or MAX8881EUT18+T equivalent, key selection criteria include its ±1.5% output accuracy over –40°C to +85°C, 100mV dropout at 50mA, 2.5V–12V input range, and integrated thermal/short-circuit protection.
Technical Context
The MAX8881EUT18+T uses an internal 1.25V reference and error amplifier to regulate output via a 2Ω PMOS pass transistor, eliminating base-drive current and enabling stable 3.5µA supply current across full load and dropout conditions. Its feedback node (FB) is internally tied to OUT, confirming fixed 1.8V operation without external resistors.
Reverse battery protection limits IN-to-GND reverse leakage to <1mA when VIN < 0V, while the open-drain POK output asserts low when VOUT drops >10% below nominal-enabling system-level fault detection and reset timing with external RC networks.
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 microcontrollers and RTCs. |
| Supply Current | 3.5µA typical at VIN = 12V - extends battery life in multi-year standby applications like wireless sensors. |
| Input Voltage Range | 2.5V to 12V - supports single-cell Li-ion (up to 4.2V), dual-cell alkaline (up to 3.2V), and 9V battery inputs. |
| Dropout Voltage | 100mV max at IOUT = 50mA - enables usable output down to VIN = 1.9V for 1.8V rail, maximizing battery discharge depth. |
| Output Current | 200mA continuous - sufficient for powering BLE SoCs, small displays, or sensor signal chains. |
| POK Threshold | 90% of nominal VOUT (1.62V) with 1.5% hysteresis - provides reliable undervoltage detection before system brownout. |
| Protection Features | Reverse battery (<1mA leakage), short-circuit, and thermal shutdown (160°C trip) - eliminates need for external protection circuitry. |
Pinout & Package
MAX8881EUT18+T is housed in a 6-pin SOT23 package (JEDEC MO-178AA, 2.9mm × 2.8mm × 1.3mm), with exposed pad not present (SOT23-6, not TDFN). Pin 1 is IN; pin 2 is GND; pin 3 is OUT; pin 4 is FB (internally connected to OUT); pin 5 is SHDN; pin 6 is open-drain POK.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Bypass with 1µF ceramic capacitor to GND; accepts 2.5V–12V; reverse polarity protected. |
| 2 - GND | Ground reference | Common return for IN, OUT, SHDN, and POK; must be low-impedance connection to PCB ground plane. |
| 3 - OUT | Regulated output | Delivers 1.8V up to 200mA; bypass with 4.7µF/≤0.5Ω ESR capacitor for full-load stability. |
| 4 - FB | Feedback sense | Internally shorted to OUT - no external components required; confirms fixed 1.8V configuration. |
| 5 - SHDN | Enable/disable control | Active-high: ≥2V turns ON; ≤0.5V forces shutdown (1.5µA quiescent); connect to IN if unused. |
| 6 - POK | Power-ok indicator | Open-drain output; sinks current when VOUT < 1.62V or during shutdown; requires pull-up for logic interface. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ regulation | 3.5µA supply current maintained across full input range and dropout - critical for >5-year battery life in IoT endpoints. |
| Integrated reverse battery protection | Sub-1mA reverse leakage at VIN = –12V - prevents damage and battery drain when cells are inserted backward. |
| Factory-trimmed 1.8V output | ±1.5% accuracy over temperature - eliminates external resistor network and calibration, reducing BOM count and layout area. |
| PMOS pass device | 2Ω RDS(ON) - enables low dropout and zero base-drive loss, unlike PNP-based LDOs that increase IQ under load. |
| Power-OK (POK) monitor | Dedicated open-drain flag with 10% threshold and hysteresis - simplifies system reset sequencing without external comparators. |
Applications
| Smoke Detectors | Battery-Powered Alarms |
|---|---|
Use Scenario: Standby operation for >10 years on two AA alkaline cells, with periodic self-test and alarm activation. IC Role / Device Role / Timing Role: Primary 1.8V power rail for MCU, CO sensor interface, and piezo driver. Use Value: 3.5µA quiescent current minimizes annual battery drain to <1% capacity; reverse protection prevents field failure from incorrect battery insertion. |
Use Scenario: Wireless door/window contact sensor with RF transmission upon breach, operating from CR2032 coin cell. IC Role / Device Role / Timing Role: Stable 1.8V supply for ultra-low-power sub-GHz transceiver and wake-up controller. Use Value: 100mV dropout allows operation until battery reaches 1.9V, extracting >90% of cell energy; POK enables graceful shutdown before brownout. |
| Smart Battery Packs | Real-Time Clocks |
Use Scenario: Fuel-gauge and protection IC power in multi-cell Li-ion packs, where reverse polarity risk exists during service. IC Role / Device Role / Timing Role: Isolated 1.8V bias for SMBus/I²C interface and ADC reference. Use Value: Reverse battery protection eliminates need for series diode, preserving voltage headroom; thermal shutdown prevents overheating during pack faults. |
Use Scenario: Backup power supply for RTC and SRAM in industrial controllers during main power loss. IC Role / Device Role / Timing Role: Low-noise 1.8V source for timekeeping circuitry during extended mains outage. Use Value: 300µVRMS output noise (10Hz–100kHz) ensures clock stability; 200mA capability supports simultaneous RTC + memory retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 2.3µA IQ, 250mA output, but no POK or reverse battery protection; SOT23-3 package (3 pins, no FB/SHDN). | Lacks system monitoring (POK) and polarity safety - requires external circuits for alarm signaling or reverse protection. | Choose only if POK and reverse protection are unnecessary and board space is constrained by 3-pin footprint. |
| TLC7701QDCKR | 3.5µA IQ, 1.8V fixed, includes reset timer but no reverse battery protection; 6-pin SC70 package (smaller, higher thermal resistance). | Reset timeout replaces POK functionality; SC70 limits power dissipation to ~300mW vs. SOT23's 696mW - unsuitable for sustained 200mA loads. | Select when precise reset delay is needed over POK flagging, and thermal load is light (<100mA continuous). |
Compared with MCP1700T-1802E/TT and TLC7701QDCKR, the MAX8881EUT18+T uniquely integrates POK monitoring, reverse battery protection, and 200mA capability in a thermally robust SOT23-6 package - making it optimal for safety-critical, long-life battery systems where fault visibility and polarity resilience are mandatory.
Availability
MAX8881EUT18+T is available at Aetrix Electronics and suitable for smoke detectors, battery-powered alarms, smart battery packs, real-time clocks, and remote transmitters requiring stable component supply across industrial and consumer OEM programs.
Supply support for MAX8881EUT18+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 demanding industrial, automotive, and communications applications.
The MAX8880/MAX8881 family delivers ultra-low-IQ LDO regulation with integrated protection and monitoring - engineered specifically for multi-year battery life in safety-critical portable and backup power systems.
FAQ
What is the maximum input voltage rating for the MAX8881EUT18+T?
The MAX8881EUT18+T has an absolute maximum input voltage of +14V, but its operational input range is specified from 2.5V to 12V. Operating above 12V risks exceeding safe power dissipation limits and may trigger thermal shutdown; sustained use beyond 12V is not recommended per datasheet specifications.
Does the MAX8881EUT18+T require external components for basic operation?
No - the MAX8881EUT18+T operates with only two external capacitors: a 1µF ceramic capacitor from IN to GND and a 4.7µF/≤0.5Ω ESR capacitor from OUT to GND. The FB pin is internally connected to OUT, and no resistor divider or additional circuitry is needed for its fixed 1.8V output.
How does the POK output function on the MAX8881EUT18+T?
The POK output on the MAX8881EUT18+T is an open-drain signal that pulls low when the regulated output falls below 90% of nominal (i.e., <1.62V) or during shutdown. It remains high-impedance otherwise. A pull-up resistor (e.g., 100kΩ to VOUT) is required to generate a logic-high signal during normal regulation.
Can the MAX8881EUT18+T be used with a 1.5V alkaline battery?
No - the MAX8881EUT18+T requires a minimum input voltage of 2.5V to maintain regulation. A single 1.5V alkaline cell cannot power it directly; however, two series alkaline cells (3.0V fresh, ~2.6V under load) are compatible and provide sufficient headroom for 1.8V output with margin.
Is the MAX8881EUT18+T pin-compatible with other variants in the MAX8881 family?
Yes - all MAX8881 variants (EUT18-T, EUT25-T, EUT33-T, EUT50-T) share identical 6-pin SOT23 pinout and electrical interface. Only the factory-trimmed output voltage differs; swapping variants requires no PCB changes, provided the input voltage and load requirements remain compatible.
MAX8881EUT18+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- 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):
- 0.2V @ 50mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 10 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX8881EUT18+T FAQ
1.How can I place an order for MAX8881EUT18+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8881EUT18+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 MAX8881EUT18+T reliable?
The price and inventory of MAX8881EUT18+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8881EUT18+T is usually 5 days.
3.What payment methods are accepted for MAX8881EUT18+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8881EUT18+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8881EUT18+T?
MAX8881EUT18+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8881EUT18+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 MAX8881EUT18+T?
For technical support, including MAX8881EUT18+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8881EUT18+T requirements.
6.How does Aetrix verify that MAX8881EUT18+T is sourced from the original manufacturer or authorized distributors?
All MAX8881EUT18+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 MAX8881EUT18+T meets industry standards.
7.What is the process for return or replacement of MAX8881EUT18+T?
All MAX8881EUT18+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8881EUT18+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 MAX8881EUT18+T part is unused and in its original packaging.
Return procedure for MAX8881EUT18+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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