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Analog Devices Inc./Maxim Integrated MAX1818EUT33+T
- Part No.:
- MAX1818EUT33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT33+T.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:4,695
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Product details
Overview
The MAX1818EUT33+T from Maxim Integrated is a 3.3V fixed-output, 500mA low-dropout linear regulator featuring ±1% output voltage accuracy, 120mV dropout at full load, and 125μA ground current independent of load. It integrates an active-low open-drain POK (power-ok) output, 0.1μA shutdown current, thermal shutdown at +170°C, and short-circuit protection. Designed for space-constrained portable systems, it powers core logic rails in notebook computers and USB hubs.
For engineers reviewing the MAX1818EUT33+T datasheet, MAX1818EUT33+T pinout, MAX1818EUT33+T application, or MAX1818EUT33+T equivalent, key selection criteria include guaranteed 500mA output under 120mV dropout, preset 3.3V operation without external resistors, SOT23-6 footprint compatibility, and integrated POK signaling for microcontroller power sequencing.
Technical Context
The MAX1818EUT33+T employs an internal P-channel MOSFET pass transistor with 0.25Ω RDS(ON), enabling low dropout and eliminating base-drive current draw. Its Dual Mode™ architecture selects between factory-trimmed 3.3V output (via SET pin grounded) and adjustable mode (via external resistor divider), with VSET threshold of 1.25V ±1.5% over temperature.
Regulation relies on a 1.25V precision reference and error amplifier comparing feedback against that reference. The POK output asserts low when VOUT falls below 93% of nominal (3.099V), with 100kΩ pull-up to OUT recommended. Thermal protection cycles the pass transistor off/on with 20°C hysteresis above +170°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% at 100mA, ±3% over full load/temperature range - ensures stable core logic supply for 3.3V I/O domains. |
| Dropout Voltage | 120mV at 500mA - enables operation down to 3.42V input, extending usable battery life in single-cell Li-ion systems. |
| Ground Current | 125μA typical at 100μA–500mA load - minimizes quiescent loss in always-on subsystems like real-time clocks. |
| Shutdown Current | 0.1μA max - reduces standby drain in battery-backed applications such as PDAs and docking stations. |
| POK Threshold | 93% of nominal (3.099V) with 3% hysteresis - provides reliable power-good assertion for μC reset sequencing without external comparators. |
| Thermal Shutdown | +170°C activation with +20°C hysteresis - protects against sustained overload while permitting pulsed operation during transient faults. |
| Short-Circuit Limit | 0.55–0.8A typical - limits fault current to prevent PCB trace damage during output shorts. |
Pinout & Package
MAX1818EUT33+T is housed in a RoHS-compliant 6-pin SOT23-6 package (outline 21-0058, package code U6FH-6) with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm height. Thermal pad is not present; copper area shared equally across IN, OUT, and GND pins improves heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts 2.5V–5.5V; requires 1μF bypass to GND near pin for stability and noise reduction. |
| 2 - POK | Open-drain power-ok indicator | Pulls low when VOUT < 3.099V; needs 100kΩ pull-up to OUT for logic-level signal to μC. |
| 3 - SHDN | Active-low enable control | Logic low disables regulator, forcing OUT to high-Z and POK low; tolerates up to +6V regardless of VIN/VOUT. |
| 4 - GND | Power and signal reference | Common return for IN, OUT, SET, SHDN, and POK; must be low-impedance plane for thermal and noise performance. |
| 5 - SET | Feedback node selector | Grounded for 3.3V preset mode; connects to external resistor divider for adjustable outputs (1.25V–5.0V). |
| 6 - OUT | Regulated output source | Delivers up to 500mA; requires 3.3μF low-ESR capacitor (≤0.1Ω) to GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| P-Channel MOSFET Pass Device | Eliminates base-drive current, maintaining 125μA ground current across full 0–500mA load range and in dropout. |
| Dual Mode™ Output Selection | Factory-trimmed 3.3V output activated by grounding SET pin - no external resistors required for standard rail generation. |
| Integrated Power-OK (POK) Output | Provides system-level power sequencing signal without external monitoring circuitry, reducing BOM count and layout area. |
| Thermal Cycling Protection | Shuts down at +170°C and re-enables after cooling 20°C - prevents permanent damage during sustained overload or poor heatsinking. |
| Low-Noise Operation | 115μVRMS output noise (10Hz–1MHz) with 3.3μF ceramic output capacitor - suitable for noise-sensitive analog and RF subsystems. |
Applications
| Notebook Computers | USB Hubs |
|---|---|
Use Scenario: Regulating 3.3V I/O supply for USB controller, PCIe link, and display interface logic in ultra-thin notebooks. IC Role / Device Role / Timing Role: Primary LDO delivering clean, stable 3.3V rail with fast transient response to handle burst-mode data transfers. Use Value: 120mV dropout extends battery runtime by enabling operation until input drops to 3.42V; POK signal synchronizes system boot sequence. | Use Scenario: Providing isolated 3.3V power to downstream USB 2.0 ports and hub controller in compact desktop or travel hubs. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring compliance with USB specification ripple and voltage tolerance limits. Use Value: ±1% output accuracy guarantees reliable enumeration and communication; 0.1μA shutdown current preserves host battery during suspend. |
| Cellular Telephones | Docking Stations |
Use Scenario: Supplying 3.3V to baseband processor I/O, camera interface, and audio codec in multi-band smartphones. IC Role / Device Role / Timing Role: Low-noise, low-quiescent LDO supporting dynamic voltage scaling and rapid wake/sleep transitions. Use Value: 115μVRMS noise prevents interference with RF front-end; thermal shutdown prevents overheating during simultaneous cellular/Wi-Fi transmission. | Use Scenario: Generating 3.3V auxiliary rail for hot-plug detection, USB-C CC logic, and embedded controller in laptop docking stations. IC Role / Device Role / Timing Role: Always-on regulator powering supervisor circuits that monitor host connection status and manage power handoff. Use Value: 125μA ground current minimizes parasitic drain on docked laptop battery; POK output signals valid power to host firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76333DBVR | 300mA rated, 170mV dropout at 300mA, 1.2μA quiescent current - lower output current, higher dropout, higher IQ. | Limited to sub-300mA loads; less suitable for high-current USB peripherals or baseband processors. | Select when board space allows larger solution and 300mA suffices; verify thermal margin at full load. |
| MCP1700T-3302E/MB | 250mA rated, 175mV dropout at 250mA, 1.6μA quiescent - lower current, higher dropout, significantly higher IQ than MAX1818EUT33+T. | Targeted at ultra-low-power sensor nodes, not portable computing or communication systems requiring 500mA. | Prefer only for cost-sensitive, low-current applications where 250mA and 1.6μA IQ are acceptable trade-offs. |
Compared with TPS76333DBVR and MCP1700T-3302E/MB, the MAX1818EUT33+T delivers 500mA with 120mV dropout and 125μA ground current - uniquely balancing high output capability, ultra-low quiescent loss, and compact SOT23-6 packaging for portable power rails.
Availability
MAX1818EUT33+T is available at Aetrix Electronics and suitable for notebook computers, USB hubs, and cellular telephones requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1818EUT33+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 industrial, automotive, communications, and consumer applications.
The MAX1818 series is engineered as a high-performance, low-quiescent-current LDO family targeting battery-powered portable electronics where extended runtime, small size, and reliable power sequencing are critical.
FAQ
What is the exact output voltage tolerance of the MAX1818EUT33+T over temperature and load?
The MAX1818EUT33+T delivers 3.3V with ±1% accuracy at 100mA and +25°C. Over full operating conditions (–40°C to +85°C, 1mA–500mA load, VIN ≥ VOUT + 0.5V), output voltage remains within ±3% of nominal. This is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy" with min/max limits of –3% to +3%.
Does the MAX1818EUT33+T require external resistors to set its 3.3V output?
No. The MAX1818EUT33+T has a factory-trimmed 3.3V output. To activate this preset mode, the SET pin must be connected directly to GND - no external resistors are needed. This is explicitly stated in the Selector Guide and Pin Description sections of the datasheet.
What is the maximum continuous power dissipation for the MAX1818EUT33+T in its SOT23-6 package?
The MAX1818EUT33+T has a continuous power dissipation limit of 800mW at +70°C ambient, derating by 10mW/°C above that temperature. This value assumes proper PCB copper layout per Note 1: one square inch shared equally among IN, OUT, and GND pins under still-air conditions.
How does the POK output of the MAX1818EUT33+T behave during shutdown?
During shutdown (SHDN = GND), the POK output of the MAX1818EUT33+T is actively held low regardless of the output voltage level. This behavior is documented in the Pin Description section and ensures deterministic power sequencing - the microcontroller receives a clear "power-fail" signal even when the regulator is disabled.
Can the MAX1818EUT33+T operate with an input voltage below 2.5V?
No. The absolute minimum input voltage for the MAX1818EUT33+T is 2.5V, as specified in both the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this voltage violates the device's operational specification and may result in unregulated output or undefined behavior.
MAX1818EUT33+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 (3.3V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.215V @ 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
MAX1818EUT33+T FAQ
1.How can I place an order for MAX1818EUT33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT33+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 MAX1818EUT33+T reliable?
The price and inventory of MAX1818EUT33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT33+T is usually 5 days.
3.What payment methods are accepted for MAX1818EUT33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT33+T?
MAX1818EUT33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT33+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 MAX1818EUT33+T?
For technical support, including MAX1818EUT33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT33+T requirements.
6.How does Aetrix verify that MAX1818EUT33+T is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT33+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 MAX1818EUT33+T meets industry standards.
7.What is the process for return or replacement of MAX1818EUT33+T?
All MAX1818EUT33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT33+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 MAX1818EUT33+T part is unused and in its original packaging.
Return procedure for MAX1818EUT33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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