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Analog Devices Inc./Maxim Integrated MAX1818EUT33#G16
- Part No.:
- MAX1818EUT33#G16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT33#G16.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX1818EUT33#G16 from Maxim Integrated is a 3.3V 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 including cellular phones, PDAs, and USB hubs where stable low-noise 3.3V rail generation is critical.
For engineers reviewing the MAX1818EUT33#G16 datasheet, MAX1818EUT33#G16 pinout, MAX1818EUT33#G16 application, or MAX1818EUT33#G16 equivalent, key selection criteria include guaranteed 500mA output under 2.5V–5.5V input, active-low open-drain POK output referenced to 93% of nominal VOUT, shutdown current of 0.1µA, thermal shutdown at +170°C, and compatibility with 3.3μF low-ESR ceramic output capacitors.
Technical Context
The MAX1818EUT33#G16 integrates a 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 3.3V output (SET = GND) and adjustable mode (SET biased via external divider), with VSET threshold of 1.25V and hysteresis-based POK detection at 93% of nominal VOUT.
Internal protection includes foldback current limiting (0.55–1.8A short-circuit limit), thermal shutdown with 20°C hysteresis, and undervoltage lockout (2.0–2.3V rising threshold). The device operates across –40°C to +85°C and delivers stable regulation with 1μF input and 3.3μF output ceramic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over –40°C to +85°C; enables direct replacement of standard 3.3V logic rails without external feedback components. |
| Max Output Current | 500mA guaranteed RMS; supports microcontroller cores, USB PHYs, and RF front-ends in space-constrained portable designs. |
| Dropout Voltage | 120mV at 500mA (typical); allows operation down to VIN = 3.42V, extending usable battery life in single-cell Li-ion or dual-cell alkaline systems. |
| Ground Current | 125µA at 500mA load; remains constant across load range, minimizing battery drain during active operation. |
| Shutdown Current | 0.1µA max; reduces system standby power to sub-microwatt levels when SHDN is pulled low. |
| POK Threshold | 93% of nominal VOUT (3.069V); provides reliable power-good signaling for µC reset sequencing without external comparators. |
| Thermal Shutdown | Activates at +170°C junction temperature with 20°C hysteresis; prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
Package: 6-pin SOT23 (U6F-6), 800mW power dissipation rating at +70°C ambient, RoHS-compliant (indicated by # suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input supply | 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 < 3.069V; requires external 100kΩ pull-up to OUT for logic-level signal to µC. |
| 3 SHDN | Active-low enable control | Logic low disables regulator, reducing IQ to 0.1µA; tolerates up to +6V regardless of VIN/VOUT. |
| 4 GND | Power and signal reference | Common return path for IN, OUT, SET, and POK; must be connected with low-impedance copper pour shared across IN/OUT/GND pins. |
| 5 SET | Voltage-setting input | Internally tied to 1.25V reference; grounded for 3.3V preset mode; used with 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 stability and noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ output selection | Hardware-selectable between factory-trimmed 3.3V and externally adjustable 1.25V–5.0V via SET pin, eliminating BOM variants for multiple voltage needs. |
| P-channel MOSFET pass element | 0.25Ω RDS(ON) enables 120mV dropout and eliminates base-drive current loss-critical for maintaining efficiency in dropout conditions. |
| Low-noise output | 115µVRMS integrated noise (10Hz–1MHz) with 3.3μF COUT; meets stringent analog/RF supply requirements without additional LDO filtering stages. |
| Integrated POK with hysteresis | 93% VOUT threshold with built-in hysteresis avoids chatter during brown-out recovery; replaces discrete supervisor ICs in compact designs. |
| Thermal foldback protection | Reduces output current during overheating instead of hard shutdown, allowing graceful degradation rather than system crash under thermal stress. |
Applications
| Cellular Phones | USB Hubs |
|---|---|
Use Scenario: Powering baseband processor I/O banks and RF transceiver bias rails in slim-profile handsets with single-cell Li-ion battery (2.8V–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V LDO delivering regulated supply to high-speed digital interfaces and sensitive analog blocks. Use Value: 125µA ground current extends talk time; 120mV dropout ensures regulation until battery reaches 3.42V, maximizing energy extraction. | Use Scenario: Providing clean 3.3V power to USB 2.0 transceivers and hub controller logic in bus-powered desktop or portable hubs. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling upstream 5V USB VBUS to meet USB specification ripple and noise limits. Use Value: 115µVRMS noise and 80dB PSRR at 100kHz prevent data corruption; POK signal synchronizes hub enumeration with stable VOUT. |
| Notebook Computers | Base Stations |
Use Scenario: Supplying 3.3V to embedded controller (EC), keyboard controller, and SMBus peripherals in ultra-thin notebooks with tight thermal envelopes. IC Role / Device Role / Timing Role: Secondary LDO supporting always-on subsystems requiring low quiescent current and fast wake-up from shutdown. Use Value: 0.1µA shutdown current minimizes battery drain during sleep; thermal shutdown at +170°C prevents failure during CPU throttling events. | Use Scenario: Biasing low-noise amplifiers (LNAs) and analog front-end circuitry in remote radio units (RRUs) operating in industrial temperature ranges. IC Role / Device Role / Timing Role: Precision local regulator ensuring stable 3.3V reference for ADCs and DACs in RF signal chain. Use Value: ±1% output accuracy maintains signal integrity across –40°C to +85°C; 1.25V internal reference enables accurate POK and SET functionality. |
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 |
|---|---|---|---|
| TPS76333DBVR | 3.3V fixed, 150mA output, 120mV dropout, 80µA IQ; SOT-23-5 package (no POK pin) | Lacks POK output and thermal foldback; suitable only for lower-current, non-critical monitoring applications | Select when cost sensitivity outweighs need for POK signaling and 500mA capability. |
| MCP1700T-3302E/TT | 3.3V fixed, 250mA output, 178mV dropout at 250mA, 1.6µA IQ; SOT-23-3 package (no SHDN/POK/SET) | No enable, no power-good, no adjustability; simpler interface but no system supervision features | Choose for basic 3.3V regulation where footprint and ultra-low IQ dominate over protection and monitoring. |
Compared with TPS76333DBVR and MCP1700T-3302E/TT, the MAX1818EUT33#G16 uniquely combines 500mA drive, integrated POK, thermal foldback, and Dual Mode™ flexibility in a 6-pin SOT23-making it the only option among the three capable of powering demanding portable subsystems while providing full system-level supervision.
Availability
MAX1818EUT33#G16 is available at Aetrix Electronics and suitable for cellular phones, USB hubs, notebook computers, and base stations requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1818EUT33#G16 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 targets portable battery-operated equipment requiring high-efficiency, low-noise, and feature-rich LDO regulation-including PDAs, smartphones, and USB peripherals-with emphasis on thermal robustness and system supervision integration.
FAQ
What is the maximum input voltage supported by the MAX1818EUT33#G16?
The MAX1818EUT33#G16 supports an absolute maximum input voltage of +6V on the IN pin, but its operational input range is specified from +2.5V to +5.5V. Exceeding +5.5V may trigger undervoltage lockout or cause reliability issues, even though the absolute rating permits +6V transient stress. For continuous operation, VIN must remain within 2.5V–5.5V to ensure regulation, thermal safety, and output accuracy per datasheet specifications.
Does the MAX1818EUT33#G16 require external resistors to set the 3.3V output?
No, the MAX1818EUT33#G16 does not require external resistors to set the 3.3V output. Its "33" suffix indicates factory-trimmed 3.3V fixed output, activated automatically when the SET pin is connected to GND. External resistors are only needed if using the adjustable mode (e.g., to set voltages other than 3.3V), which is not the default configuration for MAX1818EUT33#G16.
Can the POK output of the MAX1818EUT33#G16 drive a microcontroller's reset pin directly?
Yes, the POK output of the MAX1818EUT33#G16 can drive a microcontroller's reset pin directly when used with a 100kΩ pull-up resistor from POK to OUT. POK is an open-drain N-channel output that pulls low when VOUT falls below 93% of 3.3V (i.e., 3.069V) and goes high-impedance otherwise. This provides a clean, glitch-free reset assertion compatible with most µC reset inputs without additional level-shifting or buffering.
What thermal derating applies to the MAX1818EUT33#G16 in a standard SOT23 layout?
In a standard SOT23 layout with one square-inch of copper on the PCB, the MAX1818EUT33#G16 has a continuous power dissipation limit of 800mW at +70°C ambient, derating at 10mW/°C above that temperature. With minimal copper, dissipation drops to 712mW at +70°C; with quarter-square-inch copper, it rises to 790mW. To maximize thermal performance, copper must be equally shared among IN, OUT, and GND pins per Maxim's layout guidance.
Is the MAX1818EUT33#G16 compatible with ceramic output capacitors?
Yes, the MAX1818EUT33#G16 is fully compatible with ceramic output capacitors, and the datasheet explicitly recommends a 3.3μF low-ESR (<0.1Ω) ceramic capacitor for stable operation. Ceramic capacitors meet the ESR requirement, minimize board area, and improve transient response. For output voltages below 2V, a 4.7μF ceramic capacitor is advised. X5R or X7R dielectrics are preferred for stable capacitance across temperature and bias.
MAX1818EUT33#G16 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 (3.3V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.215V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 250 µA
- Current - Supply (Max):
- 140 µA
- 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
MAX1818EUT33#G16 FAQ
1.How can I place an order for MAX1818EUT33#G16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT33#G16 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 MAX1818EUT33#G16 reliable?
The price and inventory of MAX1818EUT33#G16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT33#G16 is usually 5 days.
3.What payment methods are accepted for MAX1818EUT33#G16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT33#G16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT33#G16?
MAX1818EUT33#G16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT33#G16 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 MAX1818EUT33#G16?
For technical support, including MAX1818EUT33#G16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT33#G16 requirements.
6.How does Aetrix verify that MAX1818EUT33#G16 is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT33#G16 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 MAX1818EUT33#G16 meets industry standards.
7.What is the process for return or replacement of MAX1818EUT33#G16?
All MAX1818EUT33#G16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT33#G16, 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 MAX1818EUT33#G16 part is unused and in its original packaging.
Return procedure for MAX1818EUT33#G16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1818EUT33#G16 Tags
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