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Analog Devices Inc./Maxim Integrated MAX1818EUT18-T
- Part No.:
- MAX1818EUT18-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT18-T.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,584
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Product details
Overview
The MAX1818EUT18-T from Maxim Integrated is a 500mA low-dropout linear regulator with ±1% output voltage accuracy, preset to 1.8V, operating from 2.5V to 5.5V input and featuring 120mV dropout at full load. It integrates an active-low open-drain POK output, 0.1μA shutdown current, and thermal/short-circuit protection in a 6-pin SOT23 package-designed for power management in space-constrained portable electronics.
For engineers reviewing the MAX1818EUT18-T datasheet, MAX1818EUT18-T pinout, MAX1818EUT18-T application, or MAX1818EUT18-T equivalent, key selection criteria include guaranteed 500mA output under 120mV dropout, factory-trimmed 1.8V output with no external resistors required, POK monitoring capability, ultra-low 125μA ground current across load, and RoHS-compliant SOT23-6 thermal performance up to +85°C.
Technical Context
The MAX1818EUT18-T uses an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.25Ω) enabling load-independent 125μA quiescent current and stable operation in dropout. Its Dual Mode™ architecture selects between factory-preset 1.8V regulation (SET = GND) or adjustable mode (via external resistor divider on SET pin), with VSET threshold of 1.25V ±12.5mV over temperature.
Power OK (POK) asserts low when VOUT falls below 93% of nominal (1.674V), with 100kΩ pull-up to OUT recommended. Thermal shutdown activates at +170°C with 20°C hysteresis, and short-circuit current limit is 0.55–1.8A depending on output voltage condition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 1.8V ±1% at 100mA, ±2.5% over -40°C to +85°C - ensures stable core logic supply for 1.8V I/O domains. |
| Dropout Voltage | 120mV at 500mA (VOUT = 1.8V) - enables usable battery life down to ~1.92V input in Li-ion systems. |
| Ground Current | 125μA typical at 100μA load, ≤140μA at 500mA - minimizes standby drain in always-on subsystems. |
| Shutdown Current | 0.1μA max - supports multi-week battery retention in sleep-mode handheld devices. |
| POK Threshold | 93% of nominal (1.674V), 75mV hysteresis - provides reliable undervoltage detection without chatter during brownout. |
| Thermal Shutdown | Activates at +170°C, resets at +150°C - protects against sustained overload in sealed enclosures. |
| Short-Circuit Limit | 0.55–1.8A depending on VOUT condition - prevents catastrophic failure while allowing brief inrush tolerance. |
Pinout & Package
Package: 6-pin SOT23-6 (U6F-6), 800mW power dissipation at +70°C, RoHS-compliant, top-mark ABZG.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply rail | Accepts 2.5V–5.5V; requires 1μF bypass to GND for stability and transient response. |
| 2 POK | Open-drain Power-OK indicator | Sinks current when VOUT < 93% nominal; requires external 100kΩ pull-up to OUT for logic-level signal. |
| 3 SHDN | Active-low enable control | Pull to GND for 0.1μA shutdown; tolerates up to +6V regardless of VIN/VOUT. |
| 4 GND | Power and signal reference | Common return for IN, OUT, SET, SHDN, POK; must share copper area with IN/OUT for thermal relief. |
| 5 SET | Voltage-setting input | Connected to GND for 1.8V preset; accepts 1.25V feedback 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™ voltage selection | Factory-trimmed 1.8V output with zero external components, or adjustable via SET pin - eliminates BOM cost and layout risk for fixed-voltage use. |
| Ultra-low ground current | 125μA independent of load - extends battery runtime in PDAs and cordless phones where light-load efficiency dominates. |
| Integrated POK with hysteresis | 93% threshold +75mV hysteresis - enables clean microcontroller reset signaling without external comparators or RC filters. |
| Thermal foldback protection | +170°C trip with +20°C hysteresis - sustains safe intermittent operation during thermal overload instead of hard latch-off. |
| Low-ESR capacitor compatibility | Stable with ≤0.1Ω output capacitor ESR - supports compact ceramic capacitors without requiring tantalum or polymer alternatives. |
Applications
| Cellular Telephones | Notebook Computers |
|---|---|
Use Scenario: Powering baseband processor I/O banks and RF front-end bias rails in dual-SIM smartphones with tight PCB area constraints. IC Role / Device Role / Timing Role: Primary 1.8V LDO delivering regulated supply to noise-sensitive analog sections while maintaining POK status for system health monitoring. Use Value: 120mV dropout preserves battery capacity down to 1.92V input, and 0.1μA shutdown enables >3-month shelf life without battery removal. | Use Scenario: Supplying USB controller, touchpad, and embedded controller (EC) logic rails in ultraportable notebooks with shared 3.3V/5V input bus. IC Role / Device Role / Timing Role: Secondary LDO generating clean 1.8V for low-power peripherals, coordinated with host power sequencing via POK signal. Use Value: ±1% accuracy ensures compliance with JEDEC JESD8-12 I/O voltage tolerance, and 500mA rating supports burst-mode peripheral activation. |
| Personal Digital Assistants (PDAs) | USB Hubs |
Use Scenario: Regulating main application processor core voltage in legacy PDAs using single-cell Li-ion batteries with aging voltage profiles. IC Role / Device Role / Timing Role: Main system LDO providing stable 1.8V to ARM9-class CPU and NAND flash interface, with POK tied to reset controller. Use Value: 125μA ground current maintains >100-hour standby time; thermal shutdown prevents overheating during extended GPS/WiFi sessions. | Use Scenario: Generating 1.8V auxiliary supply for USB 2.0 transceiver termination and hub controller logic in self-powered desktop hubs. IC Role / Device Role / Timing Role: Dedicated LDO isolating high-noise USB data lines from sensitive 1.8V logic, with POK confirming rail readiness before enumeration. Use Value: Low PSRR degradation above 10kHz (≥40dB to 100kHz) suppresses switching noise from upstream DC/DC converters feeding the hub. |
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 | 200mA output, 170mV dropout at 200mA, 1.8V fixed, SOT23-5 package (no POK) | Lacks POK output and thermal foldback; lower current limits use in non-critical sensor rails only | Select only if 200mA suffices and POK monitoring is handled externally. |
| MCP1700T-1802E/TT | 250mA output, 175mV dropout at 250mA, 1.8V fixed, SOT23-3 package (no SHDN/POK) | No shutdown or power-good functions; limited thermal margin (150°C TJ max, no hysteresis) | Use only in cost-sensitive, low-power applications where feature reduction is acceptable. |
Compared with TPS76318DBVR and MCP1700T-1802E/TT, the MAX1818EUT18-T delivers 2× higher output current, 30% lower dropout, integrated POK and shutdown, and thermal hysteresis-making it uniquely suitable for battery-powered systems requiring robust fault handling and full-feature integration in minimal footprint.
Availability
MAX1818EUT18-T is available at Aetrix Electronics and suitable for cellular telephones, notebook computers, and personal digital assistants requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for MAX1818EUT18-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 targets battery-powered portable electronics requiring high-current, low-dropout regulation with integrated supervision features-optimized for space-constrained designs where reliability, efficiency, and functional integration are critical.
FAQ
What output voltage does the MAX1818EUT18-T deliver, and is it adjustable?
The MAX1818EUT18-T delivers a factory-trimmed, fixed 1.8V output with ±1% accuracy at 100mA and ±2.5% over -40°C to +85°C. It is not user-adjustable by default; however, connecting the SET pin to an external resistor divider between OUT and GND enables adjustment from 1.25V to 5.0V. For the MAX1818EUT18-T specifically, SET must be tied to GND to activate the 1.8V preset mode-no external components are needed for nominal operation.
Does the MAX1818EUT18-T include power-good monitoring, and how is it implemented?
Yes, the MAX1818EUT18-T includes an active-low open-drain Power-OK (POK) output on Pin 2. POK pulls low when VOUT drops below 93% of nominal (1.674V) and goes high-impedance when regulation is restored. To generate a logic-high signal, a 100kΩ pull-up resistor from POK to OUT is required. This allows direct interfacing with microcontroller reset inputs or LED indicators-enabling system-level power health monitoring without external circuitry.
What is the maximum continuous output current and dropout voltage specification for the MAX1818EUT18-T?
The MAX1818EUT18-T guarantees 500mA continuous output current under specified conditions (VIN ≥ 2.7V). Its dropout voltage is 120mV at 500mA load for VOUT = 1.8V, measured as VIN – VOUT when VOUT is 100mV below its nominal value. This low dropout enables operation down to VIN = 1.92V while maintaining regulation-critical for extending usable battery life in single-cell Li-ion applications.
How does the MAX1818EUT18-T manage thermal protection, and what happens during overload?
The MAX1818EUT18-T incorporates thermal shutdown that activates at +170°C junction temperature and resets at +150°C (20°C hysteresis). During continuous overload, this causes pulsed output operation rather than permanent latch-off-allowing temporary fault recovery. The device also includes short-circuit current limiting (0.55–1.8A range) and is rated for 800mW dissipation at +70°C in SOT23-6 with proper PCB copper layout, ensuring robustness in thermally constrained portable designs.
What are the key capacitor requirements for stable operation of the MAX1818EUT18-T?
The MAX1818EUT18-T requires a 1μF ceramic capacitor between IN and GND, and a 3.3μF low-ESR (≤0.1Ω) ceramic capacitor between OUT and GND. For output voltages below 2V-including the 1.8V output of the MAX1818EUT18-T-a 4.7μF output capacitor is recommended. Both capacitors must be placed as close as possible to their respective pins to minimize trace inductance, ensuring stability, low noise, and optimal transient response across -40°C to +85°C.
MAX1818EUT18-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 (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-T FAQ
1.How can I place an order for MAX1818EUT18-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT18-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 MAX1818EUT18-T reliable?
The price and inventory of MAX1818EUT18-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT18-T is usually 5 days.
3.What payment methods are accepted for MAX1818EUT18-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT18-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT18-T?
MAX1818EUT18-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT18-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 MAX1818EUT18-T?
For technical support, including MAX1818EUT18-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT18-T requirements.
6.How does Aetrix verify that MAX1818EUT18-T is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT18-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 MAX1818EUT18-T meets industry standards.
7.What is the process for return or replacement of MAX1818EUT18-T?
All MAX1818EUT18-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT18-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 MAX1818EUT18-T part is unused and in its original packaging.
Return procedure for MAX1818EUT18-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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