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Analog Devices Inc./Maxim Integrated MAX1818EUT15#TG16
- Part No.:
- MAX1818EUT15#TG16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT15#TG16.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,119
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Product details
Overview
MAX1818EUT15#TG16 from Maxim Integrated is a 1.5V fixed-output, 500mA low-dropout linear regulator with ±1% output voltage accuracy, 120mV dropout at full load, and 125μA ground current - designed for power management in portable battery-powered systems such as notebook computers and cellular handsets.
For engineers reviewing the MAX1818EUT15#TG16 datasheet, MAX1818EUT15#TG16 pinout, MAX1818EUT15#TG16 application, or MAX1818EUT15#TG16 equivalent, key selection criteria include guaranteed 500mA output under 120mV dropout, active-low open-drain POK output with 93% VOUT threshold, 0.1μA shutdown current, thermal shutdown at +170°C, and SOT23-6 package compatibility with minimal PCB area.
Technical Context
The MAX1818EUT15#TG16 uses an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.25Ω) to achieve low dropout and load-independent quiescent current. Its Dual Mode™ architecture selects between factory-trimmed 1.5V output (via SET = GND) and adjustable mode (via external resistor divider), with VSET threshold of 1.25V ±12.5mV over temperature.
It integrates a 1.25V reference, error amplifier, thermal sensor, current-limit logic (0.55–1.8A short-circuit limit), and open-drain POK output that asserts low when VOUT falls below 93% of nominal - all operating across –40°C to +85°C with no external compensation required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±1% at 100mA, ±3% over full load/temperature range - ensures stable core voltage for low-power microcontrollers. |
| Dropout Voltage | 120mV at 500mA (VOUT = 1.5V) - enables operation down to VIN = 1.62V, extending usable battery life in single-cell Li-ion or Li-poly systems. |
| Ground Current | 125μA typical at light load, ≤140μA at 500mA - minimizes standby power loss without sacrificing regulation performance. |
| Shutdown Current | 0.1μA maximum - supports ultra-low-power sleep modes in portable devices with real-time clock or sensor wake-up. |
| POK Threshold | 93% of nominal VOUT (1.395V), with 3% hysteresis - provides reliable power-good signaling to µC reset logic without false triggering. |
| Thermal Shutdown | Activates at +170°C junction temperature with +20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Short-Circuit Limit | 0.55–1.8A (typ 0.8A), doubling to ~1.6A when VOUT > 96% nominal - improves transient response during sudden load steps without latch-off. |
Pinout & Package
MAX1818EUT15#TG16 is housed in a RoHS-compliant 6-pin SOT23-6 package (package code U6FH-6), rated for 800mW power dissipation at +70°C ambient with standard PCB copper layout.
| 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 noise suppression. |
| 2 POK | Open-drain Power-OK output | Pulls low when VOUT < 93% of 1.5V; requires external 100kΩ pull-up to OUT for logic-level signal to µC. |
| 3 SHDN | Active-low shutdown control | Drives regulator 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, and POK; must be connected with low-inductance trace to minimize noise coupling. |
| 5 SET | Voltage-setting input | Internally tied to GND for 1.5V fixed mode; connects to external resistive 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 transient response. |
Key Features
| Feature | Design Value |
|---|---|
| P-Channel MOSFET Pass Transistor | Eliminates base-drive current loss, enabling 125μA ground current independent of load - critical for battery runtime in always-on applications. |
| Dual Mode™ Output Selection | Factory-trimmed 1.5V output selected by grounding SET pin - avoids external resistor tolerance errors and saves board space vs. adjustable regulators. |
| Power-OK (POK) Monitor | Provides fail-safe indication of output regulation status with precise 93% threshold - enables deterministic system reset and fault logging in embedded controllers. |
| Thermal Foldback Protection | Shuts down pass transistor above +170°C and auto-restarts after 20°C cooldown - sustains safe operation under continuous overload without external circuitry. |
| Low-ESR Capacitor Compatibility | Stable with 3.3µF ceramic output capacitor (ESR < 0.1Ω) - eliminates need for tantalum or polymer capacitors, reducing BOM cost and size. |
Applications
| Notebook Computers | Cellular Telephones |
|---|---|
Use Scenario: Powering low-voltage I/O interfaces and auxiliary processors in clamshell notebooks with dual-battery or USB-C PD input. IC Role / Device Role / Timing Role: Primary 1.5V LDO supplying DDR memory termination, PCIe slot aux power, or touch controller logic rails. Use Value: 120mV dropout extends usable battery voltage down to 1.62V, adding ~8% runtime versus higher-dropout alternatives at end-of-discharge. | Use Scenario: Regulating 1.5V supply for RF transceiver bias circuits and baseband processor peripherals in 4G/LTE handsets. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO isolating sensitive analog RF sections from noisy digital domains. Use Value: 115µVRMS output noise and 60dB PSRR at 1kHz ensure clean bias for LNAs and mixers without additional filtering. |
| Personal Digital Assistants (PDAs) | USB Hubs |
Use Scenario: Delivering regulated 1.5V to ARM-based application processors and NAND flash controllers in legacy PDA platforms. IC Role / Device Role / Timing Role: Core voltage regulator enabling dynamic voltage scaling (DVS) during CPU frequency transitions. Use Value: 8mV load-transient deviation (100mA→500mA) maintains processor stability during burst-mode execution without brownout resets. | Use Scenario: Providing 1.5V auxiliary power to USB 3.0 hub controller ICs and port power switches in desktop docking stations. IC Role / Device Role / Timing Role: Secondary LDO supporting USB suspend/resume sequencing and VBUS detection logic. Use Value: 0.1μA shutdown current meets USB Battery Charging v1.2 deep-sleep requirements while maintaining fast wake-up via POK assertion. |
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 |
|---|---|---|---|
| TPS76315QDBVRQ1 | 1.5V fixed, 150mA output, 220mV dropout at full load, 80μA IQ, SOT23-5 package | Limited to lower current; lacks POK output and thermal foldback | Use only where load ≤150mA and system-level power monitoring is handled externally. |
| MCP1700T-1502E/TT | 1.5V fixed, 250mA output, 178mV dropout at 250mA, 1.6μA IQ, SOT23-3 package | No POK, no shutdown, smaller package with reduced thermal capability | Suitable for space-constrained, ultra-low-IQ applications where 250mA suffices and POK is unnecessary. |
Compared with MAX1818EUT15#TG16, both alternatives offer lower quiescent current but sacrifice 500mA output capability, integrated POK signaling, and robust thermal protection - making them viable only in lower-power, less safety-critical designs.
Availability
MAX1818EUT15#TG16 is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, personal digital assistants (PDAs), and USB hubs requiring stable component supply with guaranteed long-term availability and RoHS compliance.
Supply support for MAX1818EUT15#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 MAX1818 series was designed specifically for portable battery-operated equipment demanding high output current, ultra-low quiescent current, and integrated power-monitoring features in minimal SOT23-6 footprint.
FAQ
What is the output voltage tolerance of MAX1818EUT15#TG16 over temperature and load?
The MAX1818EUT15#TG16 guarantees ±1% output voltage accuracy at 100mA and +25°C. Over the full –40°C to +85°C temperature range and 1mA–500mA load, it maintains ±3% accuracy. This tight tolerance ensures reliable operation of 1.5V logic interfaces without external trimming or calibration.
Does MAX1818EUT15#TG16 require external components for stable operation?
Yes, MAX1818EUT15#TG16 requires a 1µF ceramic capacitor between IN and GND, and a 3.3µF low-ESR (<0.1Ω) ceramic capacitor between OUT and GND. These are mandatory for stability, transient response, and noise suppression across –40°C to +85°C. Larger values improve PSRR but are not required for basic functionality.
How does the POK output of MAX1818EUT15#TG16 function during shutdown?
During shutdown (SHDN = GND), the MAX1818EUT15#TG16 forces POK low regardless of output voltage level. This provides unambiguous power-fail signaling to system controllers, ensuring safe state retention before main power removal. POK returns to high-impedance only after SHDN is released and VOUT rises above 93% of 1.5V.
Can MAX1818EUT15#TG16 be used with input voltages below 2.5V?
No, MAX1818EUT15#TG16 has a minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics. Operation below this violates specification and may cause undervoltage lockout (VUVLO = 2.0–2.3V) or unstable regulation. For sub-2.5V inputs, consider dedicated ultra-low-input LDOs like the MAX1725.
What thermal derating applies to MAX1818EUT15#TG16 in a standard SOT23-6 layout?
With one square-inch of copper on the PCB shared equally among IN, OUT, and GND pins, MAX1818EUT15#TG16 dissipates 800mW at +70°C ambient, derating by 10mW/°C above that. At +85°C ambient, maximum allowable power drops to 650mW - corresponding to ~433mA at 1.5V output with 3.3V input (ΔV = 1.8V).
MAX1818EUT15#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 (1.5V)
- 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
MAX1818EUT15#TG16 FAQ
1.How can I place an order for MAX1818EUT15#TG16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT15#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 MAX1818EUT15#TG16 reliable?
The price and inventory of MAX1818EUT15#TG16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT15#TG16 is usually 5 days.
3.What payment methods are accepted for MAX1818EUT15#TG16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT15#TG16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT15#TG16?
MAX1818EUT15#TG16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT15#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 MAX1818EUT15#TG16?
For technical support, including MAX1818EUT15#TG16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT15#TG16 requirements.
6.How does Aetrix verify that MAX1818EUT15#TG16 is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT15#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 MAX1818EUT15#TG16 meets industry standards.
7.What is the process for return or replacement of MAX1818EUT15#TG16?
All MAX1818EUT15#TG16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT15#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 MAX1818EUT15#TG16 part is unused and in its original packaging.
Return procedure for MAX1818EUT15#TG16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1818EUT15#TG16 Tags
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MIC5504-1.8YM5-TR
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