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Analog Devices Inc./Maxim Integrated MAX1818EUT25#TG16
- Part No.:
- MAX1818EUT25#TG16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT25#TG16.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,273
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Product details
Overview
The MAX1818EUT25#TG16 from Maxim Integrated is a 2.5V 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, and thermal/short-circuit protection - designed for space-constrained, battery-powered systems including USB hubs and notebook computers.
For engineers reviewing the MAX1818EUT25#TG16 datasheet, MAX1818EUT25#TG16 pinout, MAX1818EUT25#TG16 application, or MAX1818EUT25#TG16 equivalent, key selection criteria include guaranteed 500mA output under 2.5V–5.5V input, preset 2.5V output with no external feedback required, SOT23-6 package thermal limits (800mW @ +70°C), and POK threshold at 93% of nominal VOUT.
Technical Context
The MAX1818EUT25#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 2.5V output (SET = GND) and adjustable mode (SET = external divider), with VSET threshold of 1.25V ±12.5mV over temperature.
Regulation relies on a 1.25V reference and error amplifier comparing feedback to VSET; POK asserts low when VOUT falls below 93% of nominal (2.325V), and thermal shutdown activates at +170°C with 20°C hysteresis. Current limiting operates at 0.8A typical, doubling to 1.6A when VOUT is within 4% of regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1% at 100mA, ±3% over full load/temperature range - ensures stable core logic supply without external resistors. |
| Dropout Voltage | 120mV at 500mA (VOUT = 2.5V) - enables operation down to 2.62V input, extending usable battery life in Li-ion or dual-cell alkaline systems. |
| Ground Current | 125μA typical at 100μA load, 140μA at 500mA - minimizes standby power loss in always-on subsystems. |
| Shutdown Current | 0.1μA maximum - supports ultra-low-power sleep modes in portable devices. |
| POK Threshold | 93% of nominal VOUT (2.325V) with 3% hysteresis - provides reliable power-fail detection for microcontroller reset sequencing. |
| Thermal Shutdown | Activates at +170°C with +20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| Short-Circuit Limit | 0.55–1.8A depending on input voltage - protects against accidental shorts while maintaining transient robustness. |
Pinout & Package
MAX1818EUT25#TG16 is housed in a RoHS-compliant 6-pin SOT23-6 package (U6FH-6 outline, 800mW power dissipation at +70°C), with exposed pad not electrically connected. Thermal performance requires equal copper area shared among IN, OUT, and GND pins per manufacturer guidelines.
| 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 < 2.325V; requires external 100kΩ pull-up to OUT for logic-level signaling 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 low-impedance with shared copper area for thermal management. |
| 5 - SET | Voltage-setting input | Internally tied to 1.25V reference; grounded for 2.5V fixed output; connects to external resistor divider for adjustable mode. |
| 6 - OUT | Regulated output | Delivers up to 500mA; requires 3.3μF low-ESR (<0.1Ω) ceramic capacitor to GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Output Selection | Factory-trimmed 2.5V output enabled by grounding SET pin - eliminates external feedback components and calibration effort. |
| P-Channel Pass Transistor | 0.25Ω RDS(ON) enables 120mV dropout and eliminates base-drive current - reduces ground current across full load range. |
| Power-OK (POK) Output | Open-drain output with precise 93% VOUT threshold - provides deterministic reset timing for microcontrollers without external comparators. |
| Thermal Protection with Hysteresis | +170°C trip point and +20°C cooldown hysteresis - enables safe pulsed operation during overload rather than catastrophic failure. |
| Load-Independent Quiescent Current | 125μA typical from 100μA to 500mA load - maintains battery runtime predictability in variable-load applications like PDA peripherals. |
Applications
| Notebook Computers | USB Hubs |
|---|---|
Use Scenario: Powering 3.3V or 2.5V I/O interfaces and peripheral controllers in clamshell-form-factor notebooks with tight thermal envelopes. IC Role / Device Role / Timing Role: Primary LDO supplying core logic voltage to USB transceivers and embedded controllers, with POK synchronized to system power sequencing. Use Value: 120mV dropout extends usable battery voltage down to 2.62V, increasing runtime by ~8% compared to 200mV-dropout regulators at end-of-discharge. | Use Scenario: Providing clean, regulated 2.5V supply to high-speed USB 2.0 PHYs and hub controllers in compact, bus-powered hubs. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating noisy USB VBUS from sensitive analog/digital circuitry; POK signals upstream host upon undervoltage. Use Value: 115µVRMS output noise and 60dB PSRR at 1kHz ensure signal integrity for 480Mbps data transmission without additional filtering. |
| Cellular Telephones | Docking Stations |
Use Scenario: Supplying 2.5V bias to RF front-end ICs and baseband processors in multi-band GSM/UMTS handsets with aggressive size constraints. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current LDO delivering stable voltage during burst-mode TX/RX cycles; shutdown mode enables rapid system sleep entry. Use Value: 0.1μA shutdown current reduces standby leakage by >99% versus standard LDOs, extending weeks-long idle battery life. | Use Scenario: Regulating 2.5V for PCIe switch logic and SATA bridge ICs in enterprise-grade docking stations with multiple high-power peripherals. IC Role / Device Role / Timing Role: Secondary LDO providing fault-isolated power domain for hot-plug detection circuitry; thermal protection prevents latch-up during connector insertion events. Use Value: 800mW power dissipation rating with proper copper layout supports continuous 500mA delivery even during simultaneous USB/DisplayPort enumeration. |
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 |
|---|---|---|---|
| TPS76325DBVR | 250mA output, 180mV dropout at 250mA, 1.8μA quiescent current - lower current capability but wider input range (2.7–10V). | Suitable for lower-power applications where 500mA headroom is unnecessary; less suitable for USB hub peak loads. | Select if input voltage exceeds 5.5V or if 250mA suffices with higher dropout tolerance. |
| MCP1702T-2502E/MB | 250mA output, 600mV dropout at 250mA, 2.5μA quiescent current - higher dropout and lower current, but AEC-Q100 qualified. | Targeted at automotive infotainment modules requiring qualification; not recommended for portable consumer devices needing 500mA. | Select only for automotive-grade designs where qualification outweighs performance trade-offs. |
Compared with TPS76325DBVR and MCP1702T-2502E/MB, the MAX1818EUT25#TG16 delivers 100% higher output current with 40% lower dropout and <10% of their quiescent current - making it optimal for space- and power-constrained portable electronics requiring robust 500mA delivery at minimal voltage overhead.
Availability
MAX1818EUT25#TG16 is available at Aetrix Electronics and suitable for notebook computers, USB hubs, cellular telephones, docking stations, and palmtop computers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1818EUT25#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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX1818EUT25#TG16 belongs to Maxim's low-dropout linear regulator product line, engineered specifically for battery-powered portable equipment demanding high output current, ultra-low quiescent current, and integrated power-good monitoring in minimal footprint.
FAQ
What is the guaranteed output voltage accuracy of the MAX1818EUT25#TG16 over temperature and load?
The MAX1818EUT25#TG16 guarantees ±3% output voltage accuracy over the full -40°C to +85°C temperature range and 1mA to 500mA load current, with ±1% typical accuracy at 100mA and +25°C. This specification accounts for line, load, and temperature effects, ensuring reliable 2.5V rail generation for logic and interface ICs without external trimming.
Does the MAX1818EUT25#TG16 require external components to operate at its preset 2.5V output?
No, the MAX1818EUT25#TG16 requires only two external capacitors: a 1μF ceramic capacitor from IN to GND and a 3.3μF low-ESR ceramic capacitor from OUT to GND. The 2.5V output is factory-trimmed; SET must be connected directly to GND to activate preset mode - no resistive divider or additional components are needed.
How does the POK output of the MAX1818EUT25#TG16 behave during shutdown?
During shutdown (SHDN = GND), the MAX1818EUT25#TG16 forces POK low regardless of output voltage level, and OUT enters high-impedance state. This behavior ensures deterministic reset signaling to microcontrollers even when VOUT decays slowly due to output capacitance, preventing spurious wakeups or undefined logic states.
What thermal derating applies to the MAX1818EUT25#TG16 in a standard SOT23-6 layout?
The MAX1818EUT25#TG16 has a thermal derating factor of 10mW/°C above +70°C ambient, with 800mW maximum continuous power dissipation at +70°C. With minimal PCB copper, dissipation drops to 712mW; adding a quarter-square-inch copper area raises it to 790mW - all values assume equal copper distribution among IN, OUT, and GND pins.
Can the MAX1818EUT25#TG16 be used with input voltages below 2.5V?
No, the MAX1818EUT25#TG16 specifies a minimum input voltage of 2.5V per absolute maximum ratings and electrical characteristics tables. Operation below this violates the device's UVLO threshold (2.0–2.3V rising) and risks improper regulation or POK assertion; it is not characterized or guaranteed for sub-2.5V operation.
MAX1818EUT25#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 (2.5V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.36V @ 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
MAX1818EUT25#TG16 FAQ
1.How can I place an order for MAX1818EUT25#TG16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT25#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 MAX1818EUT25#TG16 reliable?
The price and inventory of MAX1818EUT25#TG16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT25#TG16 is usually 5 days.
3.What payment methods are accepted for MAX1818EUT25#TG16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT25#TG16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT25#TG16?
MAX1818EUT25#TG16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT25#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 MAX1818EUT25#TG16?
For technical support, including MAX1818EUT25#TG16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT25#TG16 requirements.
6.How does Aetrix verify that MAX1818EUT25#TG16 is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT25#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 MAX1818EUT25#TG16 meets industry standards.
7.What is the process for return or replacement of MAX1818EUT25#TG16?
All MAX1818EUT25#TG16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT25#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 MAX1818EUT25#TG16 part is unused and in its original packaging.
Return procedure for MAX1818EUT25#TG16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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