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Analog Devices Inc./Maxim Integrated MAX8881EUT25
- Part No.:
- MAX8881EUT25
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX8881EUT25.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:6,267
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Product details
Overview
MAX8881EUT25 from Maxim Integrated is a fixed-output, ultra-low-quiescent-current LDO linear regulator delivering 2.5V at up to 200mA. It features 3.5µA supply current, ±1.5% output voltage accuracy over -40°C to +85°C, reverse battery protection, and an open-drain POK (power-ok) output for regulation monitoring. It is designed for long-life battery-powered systems such as smoke detectors and smart battery packs.
For engineers reviewing the MAX8881EUT25 datasheet, MAX8881EUT25 pinout, MAX8881EUT25 application, or MAX8881EUT25 equivalent, key selection criteria include dropout voltage (100–200mV at 50mA), input voltage range (2.5V–12V), thermal shutdown threshold (+160°C), and compatibility with low-ESR ceramic output capacitors (≥4.7µF).
Technical Context
The MAX8881EUT25 integrates a precision 1.25V internal reference, error amplifier, PMOS pass transistor driver, and 2Ω P-channel MOSFET pass device - enabling ultra-low IQ across full load and dropout conditions. Its feedback path is internally configured (FB tied to OUT), eliminating external resistors and ensuring factory-trimmed 2.5V output stability.
Reverse battery protection limits IN-to-GND reverse leakage to <1mA when VIN < 0V; thermal shutdown activates at +160°C with 15°C hysteresis; POK asserts low when VOUT drops >10% below nominal or during shutdown. The device operates without external compensation and remains stable with 4.7µF output capacitance and ESR ≤0.5Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.5% over -40°C to +85°C - ensures stable logic-level supply for 2.5V microcontrollers and sensors. |
| Supply Current | 3.5µA typical at VIN = 12V - extends shelf life and standby runtime in battery-critical applications like remote transmitters. |
| Input Voltage Range | 2.5V to 12V - supports single-cell Li-ion (fully charged), multi-cell alkaline, and industrial 5–12V rails without external regulators. |
| Max Output Current | 200mA continuous - sufficient for low-power MCU cores, RF transceivers, and real-time clocks with burst loads. |
| Dropout Voltage | 100mV typical at 50mA load - enables operation down to ~2.6V input for 2.5V output, maximizing usable battery voltage range. |
| POK Threshold | 90% of nominal VOUT (2.25V) with 1.5% hysteresis - provides reliable power-fail detection for system reset or data-save sequencing. |
| Thermal Shutdown | Activates at TJ = +160°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
MAX8881EUT25 is packaged in a 6-pin SOT23-6 (package code: U) with exposed pad not present - footprint compatible with JEDEC MO-178AA. 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 POK (open-drain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Regulator input supply | Bypass with ≥1µF capacitor to GND; accepts 2.5–12V; reverse polarity protected to −14V. |
| 2 - GND | Power ground reference | Primary return path for IN, OUT, SHDN, and POK; must connect to low-impedance ground plane. |
| 3 - OUT | Regulated 2.5V output | Delivers up to 200mA; requires ≥4.7µF ceramic capacitor (ESR <0.5Ω) for stability under full load. |
| 4 - FB | Feedback sense node | Internally shorted to OUT in MAX8881EUT25 - no external components required; disables adjustable mode. |
| 5 - SHDN | Enable/disable control | Active-high: device enabled when VSHDN > 2V; connect to IN if unused; series 100kΩ resistor adds reverse-battery isolation. |
| 6 - POK | Power-ok open-drain flag | Sinks current when VOUT < 2.25V or SHDN = low; pull-up required (e.g., to OUT or system rail) for logic-level signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 3.5µA at 12V input - reduces standby power loss by >90% vs. standard LDOs, critical for 10+ year battery life. |
| Reverse battery protection | IN reverse leakage <1mA at −12V - eliminates need for external blocking diode or FET in consumer battery compartments. |
| Integrated POK comparator | Detects >10% VOUT deviation with 1.5% hysteresis - enables deterministic system reset without external supervisor IC. |
| PMOS pass transistor | 2Ω RDS(ON) - delivers low dropout and zero base-drive current, avoiding IQ increase in dropout unlike PNP-based LDOs. |
| Short-circuit & thermal protection | Foldback current limit + 160°C shutdown with hysteresis - allows indefinite short-circuit survival and self-recovery after cooling. |
Applications
| Smoke Detectors | Battery-Powered Alarms |
|---|---|
Use Scenario: Standby operation on 9V alkaline for >5 years, with periodic sensor polling and audible alarm bursts. IC Role / Device Role / Timing Role: Primary 2.5V supply for MCU, CO sensor interface, and piezo driver; POK monitors brownout during alarm activation. Use Value: 3.5µA IQ minimizes annual capacity drain; 2.5V output matches low-voltage ADC references and I²C peripherals. |
Use Scenario: Wireless door/window sensor using coin cell (CR2032) with sub-1µA sleep current and BLE wake-up events. IC Role / Device Role / Timing Role: Regulates 2.5V for RF SoC and accelerometer; SHDN controlled by MCU GPIO to gate power during deep sleep. Use Value: Reverse battery protection prevents damage during user battery replacement; 200mA peak supports BLE transmit bursts. |
| Remote Transmitters | Smart Battery Packs |
Use Scenario: IR or sub-GHz remote with intermittent button press, requiring fast turn-on (<100µs) and minimal voltage droop. IC Role / Device Role / Timing Role: Provides clean 2.5V rail for encoder IC and transmitter PA; POK signals valid supply before transmission. Use Value: Low dropout (100mV) ensures operation until battery reaches 2.6V; load-transient response holds VOUT within ±20mV at 50mA step. |
Use Scenario: Multi-cell Li-ion pack with fuel gauge, protection IC, and status LED - powered from auxiliary 2.5V rail derived from main battery. IC Role / Device Role / Timing Role: Supplies 2.5V to gas gauge MCU and SMBus interface; reverse protection safeguards against pack polarity reversal during service. Use Value: ±1.5% output accuracy ensures precise ADC reference for voltage/current sensing; thermal shutdown prevents overheating during fault conditions. |
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 |
|---|---|---|---|
| TPS78225DRVR | 250nA IQ, 2.5V fixed, 150mA max, 6-pin WSON - lower IQ but reduced current capability and no POK output. | Lacks POK flag and reverse battery protection - requires external supervisor and diode for same functionality. | Preferred only where nanoamp IQ dominates design priority and POK/reverse protection are handled elsewhere. |
| MCP1702T-2502E/MB | 2.5V fixed, 250mA, 4µA IQ, SOT23-5 - no POK, no reverse battery protection, 5-pin package (no FB pin). | Missing SHDN and POK pins - cannot support enable-controlled power sequencing or regulation monitoring. | Acceptable for cost-sensitive, non-safety-critical applications where supervision and polarity protection are omitted. |
Compared with MAX8881EUT25, TPS78225DRVR offers lower quiescent current but sacrifices POK functionality and reverse protection, while MCP1702T-2502E/MB provides higher output current in a smaller 5-pin footprint but removes critical system-monitoring capabilities essential for safety-certified battery devices.
Availability
MAX8881EUT25 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 traceable sourcing.
Supply support for MAX8881EUT25 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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and portable applications.
The MAX8880/MAX8881 family was engineered specifically for ultra-low-power battery-operated systems demanding extended shelf life, reverse polarity resilience, and integrated power-good signaling - targeting safety-critical and maintenance-free deployments.
FAQ
What is the maximum input voltage rating for the MAX8881EUT25?
The MAX8881EUT25 has an absolute maximum input voltage of +14V, but its operational input range is specified from 2.5V to 12V. Operation above 12V is not characterized and may compromise output accuracy, dropout performance, or long-term reliability. For 12V nominal systems, ensure transient suppression is implemented to prevent excursions beyond 14V.
Does the MAX8881EUT25 require an external feedback resistor network?
No, the MAX8881EUT25 does not require external feedback resistors. Its 2.5V output is factory-trimmed using internal precision resistors; the FB pin is internally connected to OUT. External resistors are only needed for the adjustable MAX8880 variant - connecting them to MAX8881EUT25 would disrupt regulation and is not supported.
Can the MAX8881EUT25 be used with ceramic output capacitors?
Yes, the MAX8881EUT25 is stable with ceramic output capacitors ≥4.7µF and ESR ≤0.5Ω. X7R or X5R dielectrics are recommended for full temperature range stability. Avoid Z5U/Y5V ceramics due to large capacitance and ESR drift at temperature extremes, which may cause instability or excessive output ripple.
How does the POK output behave during shutdown?
The POK output of the MAX8881EUT25 is actively pulled low during shutdown (when SHDN < 0.5V) and also when VOUT falls below 90% of nominal (2.25V). During normal regulation, POK is in high-impedance state - a pull-up resistor (e.g., 100kΩ to OUT) is required to generate a logic-high signal for host monitoring.
Is reverse battery protection active on the SHDN pin of the MAX8881EUT25?
Reverse battery protection is inherent on the IN pin but not automatically extended to SHDN. To protect SHDN from reverse polarity, a 100kΩ series resistor must be placed between the control source and SHDN pin - this limits reverse current and enables the internal protection circuitry to engage, as documented in the MAX8881EUT25 datasheet Application Information section.
MAX8881EUT25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 2.5V
- 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
MAX8881EUT25 FAQ
1.How can I place an order for MAX8881EUT25 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8881EUT25 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 MAX8881EUT25 reliable?
The price and inventory of MAX8881EUT25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8881EUT25 is usually 5 days.
3.What payment methods are accepted for MAX8881EUT25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8881EUT25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8881EUT25?
MAX8881EUT25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8881EUT25 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 MAX8881EUT25?
For technical support, including MAX8881EUT25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8881EUT25 requirements.
6.How does Aetrix verify that MAX8881EUT25 is sourced from the original manufacturer or authorized distributors?
All MAX8881EUT25 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 MAX8881EUT25 meets industry standards.
7.What is the process for return or replacement of MAX8881EUT25?
All MAX8881EUT25 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8881EUT25, 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 MAX8881EUT25 part is unused and in its original packaging.
Return procedure for MAX8881EUT25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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