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Analog Devices Inc./Maxim Integrated MAX1818EUT25#T
- Part No.:
- MAX1818EUT25#T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT25#T.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:3,997
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Product details
Overview
MAX1818EUT25#T from Maxim Integrated is a 2.5V fixed-output, 500mA low-dropout linear regulator with ±1% output voltage accuracy, 120mV dropout at full load, and 125μA ground current - designed for portable battery-powered systems requiring stable low-noise power under tight input headroom constraints.
For engineers reviewing the MAX1818EUT25#T datasheet, MAX1818EUT25#T pinout, MAX1818EUT25#T application, or MAX1818EUT25#T equivalent, this device supports critical power-rail generation in space-constrained designs where shutdown current (0.1μA), power-ok monitoring (POK), thermal protection, and SOT23-6 footprint compatibility are key selection criteria.
Technical Context
The MAX1818EUT25#T employs an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.25Ω) enabling dropout voltage directly proportional to load current (VDROPOUT = RDS(ON) × IOUT). Its Dual Mode™ architecture selects between factory-trimmed 2.5V output and adjustable mode based on SET pin voltage (<50mV triggers preset mode).
It integrates a 1.25V reference, error amplifier, thermal shutdown (170°C trip, 20°C hysteresis), short-circuit current limiting (0.55–1.8A), and open-drain POK output asserting low when VOUT falls below 93% of nominal - all operating across –40°C to +85°C with no external compensation required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1% (guaranteed over –40°C to +85°C, 1mA–500mA load) |
| Dropout Voltage | 120mV at 500mA (enables operation down to VIN = 2.62V for full-load 2.5V output) |
| Ground Current | 125μA typical at 100μA load; remains stable up to 500mA (no base-drive loss) |
| Shutdown Current | 0.1μA max (SHDN = GND; enables ultra-low-power system sleep states) |
| POK Threshold | 93% of nominal VOUT (±3% hysteresis; provides reliable power-good signaling to μC) |
| Thermal Shutdown | 170°C junction temperature with 20°C hysteresis (prevents permanent damage during overload) |
| Package Power Dissipation | 800mW at TA = +70°C (derates 10mW/°C above +70°C; requires shared copper on IN/OUT/GND pins) |
Pinout & Package
MAX1818EUT25#T is housed in a RoHS-compliant 6-pin SOT23-6 package (outline U6FH-6), rated for 800mW power dissipation at +70°C ambient with appropriate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts 2.5V–5.5V; requires 1μF bypass to GND for stability and transient response |
| 2 - POK | Open-drain power-ok indicator | Pulls low when VOUT < 93% of 2.5V; needs external 100kΩ pull-up to OUT for logic-level signal |
| 3 - SHDN | Active-low enable control | Logic low disables regulator, reduces IQ to 0.1μA, places OUT in high-impedance state |
| 4 - GND | Power and signal reference | Must be connected to low-impedance ground plane; shares thermal path with IN/OUT pins |
| 5 - SET | Mode-select and feedback node | Internally tied to GND for 2.5V preset; externally biased for adjustable mode (1.25V–5.0V) |
| 6 - OUT | Regulated output | Delivers up to 500mA; requires 3.3μF low-ESR capacitor (≤0.1Ω) to GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Output Selection | Automatic switch between factory-trimmed 2.5V and adjustable mode via SET pin voltage threshold (≤50mV = preset) |
| P-Channel Pass Transistor | Eliminates base-drive current loss; maintains 125μA ground current independent of load and in dropout |
| Load-Transient Response | 8mV typical overshoot for 100mA→500mA step (with 3.3μF COUT); improves with lower ESR or larger capacitance |
| Integrated Protection | Current limit (0.55–1.8A), thermal shutdown (170°C), and undervoltage lockout (2.0–2.3V rising threshold) |
| Low-Noise Operation | 115μVRMS output noise (10Hz–1MHz); PSRR >60dB at 1kHz supports sensitive analog/RF rails |
Applications
| USB Hubs | Notebook Computers |
|---|---|
Use Scenario: Providing clean 2.5V power to USB 2.0 transceivers and hub controller logic in compact docking solutions. IC Role / Device Role / Timing Role: Primary LDO supplying regulated 2.5V rail for USB PHY interface and embedded microcontroller peripherals. Use Value: 120mV dropout allows operation from single-cell Li-ion (3.0V min) while maintaining regulation; POK enables host-side power-fault detection before enumeration. |
Use Scenario: Generating 2.5V core voltage for DDR memory termination or chipset I/O rails in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary LDO delivering low-noise, thermally robust 2.5V supply to memory subsystems with fast load-transient response. Use Value: 8mV load-step response and 115μVRMS noise prevent data corruption; SOT23-6 footprint minimizes board area vs. larger regulators. |
| Cellular Telephones | Base Stations |
Use Scenario: Powering RF front-end bias circuits and audio codec supplies in multi-band GSM/WCDMA handsets. IC Role / Device Role / Timing Role: Low-quiescent-current LDO supplying 2.5V to analog signal chains during active transmit/receive bursts. Use Value: 125μA ground current extends standby time; thermal shutdown prevents failure during RF PA thermal stress events. |
Use Scenario: Delivering 2.5V auxiliary power to FPGA configuration circuitry and sensor interfaces in remote radio units (RRUs). IC Role / Device Role / Timing Role: Industrial-grade LDO providing fault-tolerant 2.5V rail with POK monitoring for FPGA configuration integrity checks. Use Value: –40°C to +85°C operation ensures reliability in outdoor enclosures; 0.1μA shutdown enables remote firmware update power gating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76325DBVR | 2.5V fixed, 150mA output, 120mV dropout, 80μA IQ, SOT23-5 (no POK) | Lacks POK output and thermal shutdown; lower current rating limits use to low-power logic rails | Choose only if 150mA suffices and POK/thermal protection are not required. |
| MCP1702T-2502E/MB | 2.5V fixed, 250mA output, 600mV dropout (at 250mA), 4μA IQ, SOT23-3 | Higher dropout restricts use to higher-VIN systems; no POK, no current limit, smaller package lacks thermal pad | Prefer only for ultra-low-IQ battery backup rails where 250mA and >3.1V input are acceptable. |
Compared with MAX1818EUT25#T, TPS76325DBVR offers lower quiescent current but cannot support 500mA loads or provide POK monitoring, while MCP1702T-2502E/MB trades off current capability and dropout performance for extreme low-power operation - making MAX1818EUT25#T the sole option meeting 500mA, 120mV dropout, POK, and thermal protection in SOT23-6.
Availability
MAX1818EUT25#T is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and USB hubs requiring stable component supply with guaranteed long-term availability and full RoHS compliance.
Supply support for MAX1818EUT25#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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX1818 product line delivers ultra-low-quiescent-current, high-accuracy LDOs optimized for battery-powered portable equipment where dropout voltage, thermal resilience, and integrated fault monitoring are critical.
FAQ
What output voltage does the MAX1818EUT25#T deliver?
The MAX1818EUT25#T delivers a factory-trimmed, fixed 2.5V output with ±1% accuracy over –40°C to +85°C and 1mA–500mA load current. This value is confirmed in the Selector Guide and Electrical Characteristics table, where VOUT = 2.5V is explicitly listed for suffix "25". The device does not require external resistors to achieve this voltage.
Does the MAX1818EUT25#T include power-good monitoring?
Yes, the MAX1818EUT25#T includes an open-drain POK (power-ok) output (Pin 2) that asserts low when VOUT drops below 93% of nominal (i.e., <2.325V). It requires a 100kΩ pull-up resistor to OUT to generate a logic-high signal during regulation. This feature is documented in the Pin Description and POK Output sections of the datasheet.
What is the maximum continuous output current of the MAX1818EUT25#T?
The MAX1818EUT25#T guarantees 500mA RMS output current under specified conditions (VIN ≥ 2.7V, TA = –40°C to +85°C). This is confirmed in the Electrical Characteristics table under "Guaranteed Output Current (RMS)" and supported by thermal derating curves showing 500mA operation within the 800mW package limit at +70°C ambient.
Can the MAX1818EUT25#T be used in adjustable-output configurations?
No - the MAX1818EUT25#T is configured exclusively for 2.5V fixed output. Although the MAX1818 family supports adjustable mode via the SET pin, the "25" suffix denotes factory trimming to 2.5V, and the SET pin must be connected to GND per the pin function description. Using external resistors would violate the preset mode and result in undefined regulation.
What package type and RoHS status does the MAX1818EUT25#T have?
The MAX1818EUT25#T uses a 6-pin SOT23-6 package (package code U6FH-6) with RoHS-compliant construction, indicated by the "#" in the part number suffix. This is verified in the Ordering Information and Package Information sections, which specify "U6FH-6" for RoHS-compliant SOT23 and confirm the "#" denotes RoHS compliance.
MAX1818EUT25#T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V (2.5V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.36V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 250 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1818EUT25#T FAQ
1.How can I place an order for MAX1818EUT25#T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT25#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 MAX1818EUT25#T reliable?
The price and inventory of MAX1818EUT25#T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT25#T is usually 5 days.
3.What payment methods are accepted for MAX1818EUT25#T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT25#T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT25#T?
MAX1818EUT25#T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT25#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 MAX1818EUT25#T?
For technical support, including MAX1818EUT25#T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT25#T requirements.
6.How does Aetrix verify that MAX1818EUT25#T is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT25#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 MAX1818EUT25#T meets industry standards.
7.What is the process for return or replacement of MAX1818EUT25#T?
All MAX1818EUT25#T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT25#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 MAX1818EUT25#T part is unused and in its original packaging.
Return procedure for MAX1818EUT25#T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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