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Analog Devices Inc./Maxim Integrated MAX1818EUT18#TG16
- Part No.:
- MAX1818EUT18#TG16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT18#TG16.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX1818EUT18#TG16 from Maxim Integrated is a 500mA, 1.8V fixed-output low-dropout linear regulator with ±1% output voltage accuracy, 120mV dropout at full load, and 125μA ground current - designed for battery-powered portable electronics requiring stable low-voltage rail generation under tight power budgets.
For engineers reviewing the MAX1818EUT18#TG16 datasheet, MAX1818EUT18#TG16 pinout, MAX1818EUT18#TG16 application, or MAX1818EUT18#TG16 equivalent, this device delivers verified performance in compact SOT23-6 footprint with integrated POK monitoring, thermal shutdown, and 0.1μA shutdown current - critical for PDA, cellular phone, and USB hub power management design.
Technical Context
The MAX1818EUT18#TG16 employs an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.25Ω) enabling low dropout and load-independent quiescent current. Its Dual Mode™ architecture selects between factory-trimmed 1.8V output (via SET = GND) or adjustable mode (via external resistor divider), with VSET threshold of 1.25V ±12.5mV over temperature.
It integrates a 1.25V reference, error amplifier, open-drain POK comparator (93% VOUT threshold), thermal shutdown at +170°C with 20°C hysteresis, and current limiting (0.55–1.8A short-circuit, 1.6A in-regulation). Shutdown logic disables output and forces POK low while drawing only 0.1μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% at 100mA, ±2.5% over -40°C to +85°C - ensures stable core logic supply for 1.8V microcontrollers and memory interfaces. |
| Dropout Voltage | 120mV at 500mA (VOUT = 1.8V) - enables operation down to 1.92V input, extending usable battery life in single-cell Li-ion or dual-cell NiMH systems. |
| Ground Current | 125μA typical at 100μA load, ≤140μA at 500mA - maintains ultra-low quiescent consumption across full load range, critical for standby power budgeting. |
| Shutdown Current | 0.1μA maximum at 5.5V input - reduces system leakage during sleep modes without external disconnect switches. |
| POK Threshold | 93% of nominal VOUT (1.674V) with 3% hysteresis - provides reliable power-good signaling to µC reset controllers without false triggering during line/load transients. |
| Thermal Protection | Shuts down at +170°C junction temperature with +20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| Package Power Dissipation | 800mW at +70°C ambient (derates 10mW/°C above), requiring ≥1 in² copper area shared across IN/OUT/GND pins for full 500mA capability. |
Pinout & Package
MAX1818EUT18#TG16 is housed in a RoHS-compliant 6-pin SOT23-6 package (package code U6FH-6), measuring 2.9mm × 1.6mm × 1.1mm, rated for 800mW continuous dissipation at +70°C ambient with proper PCB copper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts 2.5V–5.5V input; requires 1µF bypass capacitor to GND for stability and transient response. |
| 2 - POK | Open-drain power-ok indicator | Pulls low when VOUT < 93% of 1.8V; must be pulled up externally (e.g., 100kΩ to OUT) to generate active-high signal for µC monitoring. |
| 3 - SHDN | Active-low shutdown control | Drives device into 0.1μA shutdown state when pulled to GND; tolerates up to +6V regardless of VIN/VOUT. |
| 4 - GND | Power and signal reference | Common return path for IN, OUT, SET, SHDN, and POK; must connect to low-impedance PCB ground plane. |
| 5 - SET | Voltage selection interface | Internally tied to GND for 1.8V preset mode; connects to external resistor divider for adjustable outputs (1.25V–5.0V). |
| 6 - OUT | Regulated output terminal | Delivers up to 500mA; requires 3.3µF low-ESR (<0.1Ω) ceramic capacitor to GND; high-impedance in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Output Selection | Factory-trimmed 1.8V output enabled by grounding SET pin - eliminates external feedback resistors and saves board space in fixed-rail applications. |
| P-Channel MOSFET Pass Device | 0.25Ω RDS(ON) enables 120mV dropout and eliminates base-drive current - reduces ground current dependency on load and improves efficiency in dropout region. |
| Integrated Power-OK Monitoring | Open-drain POK output with precise 93% VOUT threshold - provides deterministic reset signaling without external comparators or voltage dividers. |
| Thermal & Current Protection | Combined 1.6A in-regulation and 0.8A short-circuit current limit plus +170°C thermal shutdown - protects against sustained overload and PCB-level fault conditions. |
| Ultra-Low Shutdown Leakage | 0.1μA max shutdown current - meets stringent energy harvesting and long-term battery backup requirements where µA-level leakage is critical. |
Applications
| Cellular Telephones | USB Hubs |
|---|---|
|
Use Scenario: Powering baseband processor I/O rails and RF front-end bias supplies in GSM/UMTS handsets with single-cell Li-ion battery input. IC Role / Device Role / Timing Role: Primary 1.8V LDO delivering clean, regulated power to noise-sensitive analog and digital subsystems. Use Value: 120mV dropout extends usable battery voltage down to 1.92V, increasing talk time by ~8% versus higher-dropout alternatives; 115µVRMS output noise prevents RF desensitization. |
Use Scenario: Generating 1.8V supply for USB 2.0 transceiver logic and hub controller I/O in portable docking stations. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 3.3V system rail to 1.8V logic interface voltage. Use Value: 500mA rating supports multi-port hubs with simultaneous enumeration; POK output synchronizes hub initialization with stable 1.8V rail presence. |
| Notebook Computers | Personal Digital Assistants (PDAs) |
|
Use Scenario: Supplying 1.8V core voltage to embedded controller (EC) and touch controller in ultraportable notebooks with constrained thermal envelope. IC Role / Device Role / Timing Role: Secondary LDO providing isolated, low-noise 1.8V rail independent of main CPU VRM. Use Value: 125μA ground current minimizes idle power draw; thermal shutdown prevents overheating in sealed chassis with limited airflow. |
Use Scenario: Regulating 1.8V for ARM-based application processor and NAND flash interface in handheld PDAs powered by replaceable AA/AAA batteries. IC Role / Device Role / Timing Role: Main system LDO managing battery-to-logic conversion with shutdown control via host processor GPIO. Use Value: 0.1μA shutdown current enables >1-year shelf life in battery-backed real-time clock mode; SOT23-6 footprint fits tight board layouts. |
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 |
|---|---|---|---|
| TPS76318DBVR | 1.8V fixed, 150mA output, 120mV dropout at 150mA, 85μA IQ - lower current rating and no POK output. | Limited to low-power peripherals; unsuitable for 500mA loads like USB hub controllers or baseband processors. | Select only if load current ≤150mA and POK monitoring is unnecessary. |
| MCP1700T-1802E/TT | 1.8V fixed, 250mA output, 178mV dropout at 250mA, 1.6μA IQ - higher dropout, lower current, no thermal shutdown or POK. | Targeted at ultra-low-IQ sensor nodes; lacks protection features required for handheld consumer devices. | Use only in always-on, low-duty-cycle applications where thermal robustness and fault reporting are not required. |
Compared with TPS76318DBVR and MCP1700T-1802E/TT, MAX1818EUT18#TG16 uniquely combines 500mA output, 120mV dropout, integrated POK, and thermal shutdown in SOT23-6 - making it the sole option among these three for thermally demanding, high-current portable applications requiring comprehensive fault detection.
Availability
MAX1818EUT18#TG16 is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and USB hubs requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for MAX1818EUT18#TG16 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, automotive, communications, and consumer applications.
The MAX1818 series was developed specifically for battery-powered portable equipment - emphasizing ultra-low quiescent current, low dropout, small footprint, and integrated protection to extend runtime and improve system reliability.
FAQ
What is the output voltage tolerance of MAX1818EUT18#TG16 over temperature and load?
The MAX1818EUT18#TG16 guarantees ±1% output voltage accuracy at 100mA and +25°C. Over the full -40°C to +85°C operating range and 1mA–500mA load, the specification tightens to ±2.5% for VOUT < 2.0V (i.e., 1.8V), and ±3% across full load and temperature when input exceeds VOUT + 0.5V. This ensures reliable 1.8V rail integrity for 1.8V logic families under real-world thermal and loading conditions.
Can MAX1818EUT18#TG16 be used in adjustable-output configuration?
Yes, MAX1818EUT18#TG16 supports adjustable output from 1.25V to 5.0V by connecting the SET pin to an external resistor divider between OUT and GND. When configured this way, the internal 1.8V preset is disabled. The device retains all protections (POK, thermal shutdown, current limit) and specifications apply per the adjustable-mode test conditions in the datasheet - including VSET = 1.25V ±12.5mV over temperature.
What is the minimum input voltage required for MAX1818EUT18#TG16 to maintain regulation at 500mA?
For MAX1818EUT18#TG16 to deliver 500mA while maintaining 1.8V output regulation, the minimum input voltage is VOUT + VDROPOUT = 1.8V + 0.12V = 1.92V. However, the absolute minimum specified input is 2.5V per Absolute Maximum Ratings - meaning the device is not guaranteed to operate below 2.5V even if dropout allows it. Therefore, 2.5V is the practical lower limit for reliable operation at full load.
How does the POK output behave during shutdown of MAX1818EUT18#TG16?
During shutdown (SHDN = GND), the MAX1818EUT18#TG16 forces the POK output low regardless of the actual output voltage level. This behavior is explicitly defined in the datasheet and ensures unambiguous power-fail signaling to the host system - preventing false "power OK" assertions during intentional power-down sequences. POK remains low until SHDN is released and VOUT rises above 93% of 1.8V.
What PCB layout practices are required to achieve full 500mA output from MAX1818EUT18#TG16?
To sustain 500mA continuously, MAX1818EUT18#TG16 requires ≥1 square inch of copper area thermally connected to pins 1 (IN), 4 (GND), and 6 (OUT), equally distributed among them. With minimal copper, the SOT23 package dissipates only 712mW at +70°C - insufficient for 500mA at typical input-output differentials. Use wide, short traces and multiple vias to inner-layer ground planes to meet the 800mW dissipation rating and prevent thermal shutdown.
MAX1818EUT18#TG16 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 (1.8V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- -
- 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
MAX1818EUT18#TG16 FAQ
1.How can I place an order for MAX1818EUT18#TG16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT18#TG16 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 MAX1818EUT18#TG16 reliable?
The price and inventory of MAX1818EUT18#TG16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT18#TG16 is usually 5 days.
3.What payment methods are accepted for MAX1818EUT18#TG16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT18#TG16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT18#TG16?
MAX1818EUT18#TG16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT18#TG16 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 MAX1818EUT18#TG16?
For technical support, including MAX1818EUT18#TG16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT18#TG16 requirements.
6.How does Aetrix verify that MAX1818EUT18#TG16 is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT18#TG16 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 MAX1818EUT18#TG16 meets industry standards.
7.What is the process for return or replacement of MAX1818EUT18#TG16?
All MAX1818EUT18#TG16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT18#TG16, 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 MAX1818EUT18#TG16 part is unused and in its original packaging.
Return procedure for MAX1818EUT18#TG16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1818EUT18#TG16 Tags
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MIC5504-1.8YM5-TR
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