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Analog Devices Inc./Maxim Integrated MAX1818EUT50+T
- Part No.:
- MAX1818EUT50+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT50+T.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,635
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Product details
Overview
MAX1818EUT50+T from Maxim Integrated is a 500mA low-dropout linear regulator with ±1% output voltage accuracy, preset to 5.0V, operating from 2.5V to 5.5V input and delivering 120mV dropout at full load. It features an active-low open-drain POK output, 0.1μA shutdown current, and thermal/short-circuit protection - deployed in notebook computers, USB hubs, and cellular base stations.
For engineers reviewing the MAX1818EUT50+T datasheet, MAX1818EUT50+T pinout, MAX1818EUT50+T application, or MAX1818EUT50+T equivalent, key selection criteria include guaranteed 500mA output under 120mV dropout, factory-trimmed 5.0V output with ±1% accuracy over temperature, SOT23-6 package thermal limits (800mW at +70°C), and dual-mode SET pin operation enabling preset or adjustable configuration.
Technical Context
The MAX1818EUT50+T uses an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.25Ω) to achieve low dropout and maintain 125μA ground current independent of load. Its error amplifier compares a 1.25V reference against feedback from either internal resistors (for 5.0V preset) or external divider connected to SET.
Power OK (POK) logic monitors VOUT against 93% of nominal regulation voltage and asserts low when out-of-regulation; SHDN enables 0.1μA shutdown with high-impedance OUT and forced POK low. Thermal shutdown activates at +170°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% (guaranteed over -40°C to +85°C, 1mA–500mA load) |
| Dropout Voltage | 120mV at 500mA (enables operation down to VIN = 5.12V for stable 5.0V output) |
| Ground Current | 125μA typical at 100μA load; remains stable up to 500mA (no load-dependent quiescent rise) |
| Shutdown Current | 0.1μA maximum (reduces system standby power in battery-critical applications) |
| POK Threshold | 93% of nominal VOUT (i.e., 4.65V for 5.0V output), open-drain N-channel output |
| Thermal Shutdown | Activates at +170°C junction temperature with +20°C hysteresis (prevents permanent damage during overload) |
| Short-Circuit Limit | 0.55–0.8A typical (protects IC and source during output fault without latch-up) |
Pinout & Package
Package: 6-pin SOT23-6 (U6F-6 outline), 800mW power dissipation at +70°C ambient, RoHS-compliant (# suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply connection | Accepts 2.5V–5.5V; requires 1μF bypass capacitor to GND for stability and noise reduction |
| 2 POK | Open-drain Power-OK indicator | Pulls low when VOUT < 4.65V; requires external 100kΩ pull-up to OUT for logic-level signal to μC |
| 3 SHDN | Active-low shutdown control | Logic low reduces supply current to ≤0.1μA; OUT goes high-impedance; POK forced low |
| 4 GND | Ground reference | Common return for IN, OUT, SET, SHDN, and POK; must share copper area with IN/OUT for thermal performance |
| 5 SET | Voltage-setting input | Internally tied to GND for 5.0V preset mode; connects to external resistor divider for adjustable outputs (1.25V–5.0V) |
| 6 OUT | Regulated output | Delivers up to 500mA; requires 3.3μF low-ESR (<0.1Ω) ceramic capacitor to GND for transient stability |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Mode Output Selection | Factory-trimmed 5.0V output enabled by grounding SET; no external components required for fixed-voltage use |
| Low Dropout Architecture | P-channel MOSFET pass element eliminates base-drive current loss - maintains 125μA ground current even at 500mA and in dropout |
| Integrated Fault Protection | Combined short-circuit limit (0.8A typ), thermal shutdown (+170°C), and output current limiting prevent destructive failure under fault conditions |
| Microcontroller-Ready Monitoring | POK output provides reliable power-good signaling to host μC without external comparators or timing circuits |
| Ultra-Low Shutdown Consumption | 0.1μA shutdown current extends battery life in portable systems where long-term sleep modes are critical |
Applications
| Notebook Computers | USB Hubs |
|---|---|
Use Scenario: Regulating 5.0V rail for USB peripheral interface logic and PHY circuitry in compact laptop docking solutions. IC Role / Device Role / Timing Role: Primary 5.0V LDO supplying USB controller, hub transceivers, and status LEDs. Use Value: 120mV dropout allows sustained 5.0V output even as battery voltage drops to 5.12V, extending usable runtime. |
Use Scenario: Providing clean, regulated 5.0V power to downstream USB 2.0 ports in self-powered hub designs. IC Role / Device Role / Timing Role: Local 5.0V regulator for bus-powered or self-powered USB hub ICs requiring tight voltage tolerance. Use Value: ±1% output accuracy ensures USB specification compliance (4.75–5.25V); POK confirms rail readiness before enumeration. |
| Cellular Base Stations | Palmtop Computers |
Use Scenario: Powering low-noise RF front-end bias circuits and microcontroller peripherals in small-cell BTS modules. IC Role / Device Role / Timing Role: Secondary 5.0V LDO for isolated analog/digital subsystems requiring low PSRR and minimal load-dependent drift. Use Value: 115µVRMS output noise and 60dB PSRR at 1kHz ensure signal integrity in sensitive RF sections. |
Use Scenario: Delivering stable 5.0V to flash memory controllers and display drivers in space-constrained handheld PDAs. IC Role / Device Role / Timing Role: Compact-area 5.0V regulator supporting burst-mode loads (e.g., LCD backlight switching) with fast transient recovery. Use Value: Load-transient response holds output within ±8mV for 100mA→500mA steps - prevents brownout resets during display updates. |
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 |
|---|---|---|---|
| TPS76350DBVR | 500mA output, 170mV dropout at 500mA, ±2% accuracy, 1.2µA quiescent current in active mode | Lacks POK output and dual-mode SET; requires external feedback for adjustable variants | Preferred where ultra-low quiescent current is secondary to cost and footprint; not drop-in due to missing POK and different pinout |
| MCP1826-5002E/DB | 500mA output, 350mV dropout at 500mA, ±2% accuracy, integrated thermal shutdown only (no short-circuit limit) | No power-good output; no shutdown control pin; fixed 5.0V only (no adjustable mode) | Suitable for non-critical 5.0V rails where fault coverage is less stringent; requires PCB redesign due to 5-pin SOT23 package |
Compared with MAX1818EUT50+T, TPS76350DBVR offers lower active IQ but omits POK and SET flexibility, while MCP1826-5002E/DB lacks both POK and SHDN functionality and has higher dropout - making MAX1818EUT50+T uniquely suited for space-constrained, fault-aware 5.0V systems requiring guaranteed regulation monitoring and low-quiescent shutdown.
Availability
MAX1818EUT50+T is available at Aetrix Electronics and suitable for notebook computers, USB hubs, and cellular base stations requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1818EUT50+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 portable applications.
The MAX1818 series delivers high-current, low-dropout regulation in ultra-small SOT23 packages for battery-powered systems where efficiency, reliability, and board space are critical constraints.
FAQ
What is the guaranteed output voltage accuracy of the MAX1818EUT50+T across temperature and load?
The MAX1818EUT50+T guarantees ±1% output voltage accuracy at TA = +25°C with 100mA load and VOUT ≥ 2.0V. Over the full -40°C to +85°C range and 1mA–500mA load, accuracy degrades to ±3%, confirmed by production testing and design guarantee per datasheet Electrical Characteristics table.
Does the MAX1818EUT50+T support adjustable output voltage, or is it fixed at 5.0V?
The MAX1818EUT50+T is factory-trimmed for 5.0V output but retains full adjustable-mode capability via the SET pin. Connecting an external resistor divider between OUT and GND enables output voltages from 1.25V to 5.0V - the "50" suffix denotes preset 5.0V, not hardware limitation.
What is the maximum continuous power dissipation for the MAX1818EUT50+T in its SOT23-6 package?
The MAX1818EUT50+T has a maximum continuous power dissipation of 800mW at TA = +70°C, derating by 10mW/°C above that temperature. This limit assumes proper PCB copper layout - equal thermal sharing among IN, OUT, and GND pins with one square inch of copper area.
How does the POK output on the MAX1818EUT50+T behave during shutdown?
During shutdown (SHDN = GND), the MAX1818EUT50+T forces POK low regardless of output voltage level. This behavior is intentional and documented in the Pin Description section - POK is held low to unambiguously indicate disabled regulation state, distinct from normal out-of-regulation detection.
Is the MAX1818EUT50+T RoHS-compliant, and what package marking indicates compliance?
Yes, the MAX1818EUT50+T is RoHS-compliant, indicated by the "#" symbol in its package code (U6FH-6) and the "ABZL" top-mark for RoHS-compliant SOT23 units. The "+T" suffix confirms tape-and-reel packaging with full environmental compliance documentation.
MAX1818EUT50+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:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V (5V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.22V @ 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
MAX1818EUT50+T FAQ
1.How can I place an order for MAX1818EUT50+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT50+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 MAX1818EUT50+T reliable?
The price and inventory of MAX1818EUT50+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT50+T is usually 5 days.
3.What payment methods are accepted for MAX1818EUT50+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT50+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT50+T?
MAX1818EUT50+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT50+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 MAX1818EUT50+T?
For technical support, including MAX1818EUT50+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT50+T requirements.
6.How does Aetrix verify that MAX1818EUT50+T is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT50+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 MAX1818EUT50+T meets industry standards.
7.What is the process for return or replacement of MAX1818EUT50+T?
All MAX1818EUT50+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT50+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 MAX1818EUT50+T part is unused and in its original packaging.
Return procedure for MAX1818EUT50+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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