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Analog Devices Inc./Maxim Integrated MAX1818EUT20#TG16
- Part No.:
- MAX1818EUT20#TG16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT20#TG16.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:3,957
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Product details
Overview
The MAX1818EUT20#TG16 from Maxim Integrated is a 2.0V preset, 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 notebook computers, cellular phones, and USB hubs.
For engineers reviewing the MAX1818EUT20#TG16 datasheet, MAX1818EUT20#TG16 pinout, MAX1818EUT20#TG16 application, or MAX1818EUT20#TG16 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 ≤0.1μA, and SOT23-6 thermal performance up to +85°C.
Technical Context
The MAX1818EUT20#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 2.0V output (via SET = GND) and adjustable mode (via external resistor divider on SET pin).
It integrates a 1.25V reference, error amplifier, thermal shutdown (170°C trip, 20°C hysteresis), short-circuit protection (0.55–1.8A limit), and power-ok comparator with 90–96% VOUT threshold. The POK output is open-drain N-channel, requiring external pull-up to OUT or VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 2.0V ±1% at 100mA, ±2.5% over -40°C to +85°C - ensures stable core logic supply in portable systems. |
| Dropout Voltage | 120mV at 500mA (VOUT = 2.0V) - enables operation down to VIN = 2.12V, extending battery life in Li-ion and multi-cell alkaline applications. |
| Ground Current | 125μA typical at 100μA load, 140μA at 500mA - minimizes standby power loss without load-dependent increase. |
| Shutdown Current | 0.1μA max at VIN = 5.5V - supports ultra-low-power sleep modes in handheld devices. |
| POK Threshold | Rising edge at 90–96% of nominal VOUT - provides reliable power-good signaling for microcontroller reset sequencing. |
| Thermal Shutdown | 170°C trip with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| Short-Circuit Limit | 0.55–1.8A depending on VIN and VOUT - protects against transient faults while sustaining higher current during in-regulation transients. |
Pinout & Package
MAX1818EUT20#TG16 is housed in a RoHS-compliant 6-pin SOT23-6 package (package code U6FH-6), rated for 800mW dissipation at +70°C with derating above that temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Regulator input supply | Accepts 2.5V–5.5V; requires 1μF bypass to GND for stability and noise reduction. |
| 2 - POK | Open-drain power-ok indicator | Pulls low when VOUT < 93% of 2.0V; must be pulled up externally (e.g., 100kΩ to OUT) for logic-level signaling. |
| 3 - SHDN | Active-low shutdown control | Logic low disables regulator, reduces IQ to ≤0.1μA, places OUT in high-impedance state. |
| 4 - GND | Power and signal reference | Common return path; copper area must be equally shared with IN and OUT pins for optimal thermal performance. |
| 5 - SET | Voltage-setting input | Connected to GND for 2.0V preset mode; used with external resistive divider for adjustable outputs (1.25V–5.0V). |
| 6 - OUT | Regulated output | Delivers up to 500mA; requires 3.3μF low-ESR capacitor (≤0.1Ω) to GND; 4.7μF if VOUT < 2.0V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ voltage selection | Factory-trimmed 2.0V output or user-adjustable 1.25V–5.0V via external resistor network - eliminates need for multiple SKUs in design-in phase. |
| P-channel MOSFET pass element | 0.25Ω RDS(ON) enables low dropout and eliminates base-drive current - maintains 125μA ground current across full 0–500mA load range. |
| Integrated thermal protection | 170°C shutdown with 20°C hysteresis - enables safe pulsed operation during overload without latch-off, supporting robust field reliability. |
| Low-noise regulated output | 115μVRMS (10Hz–1MHz) with 3.3μF COUT - meets noise-sensitive analog and RF subsystem requirements in portable devices. |
| High PSRR at low frequencies | 70dB at 100Hz, 50dB at 10kHz - suppresses ripple from switching DC/DC stages upstream of LDO, reducing need for additional filtering. |
Applications
| Notebook Computers | Cellular Telephones |
|---|---|
Use Scenario: Powering 2.0V I/O or memory interface rails in ultraportable notebooks with dual-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary LDO delivering clean, regulated 2.0V from variable 3.0–4.2V battery input during discharge cycle. Use Value: 120mV dropout extends usable battery runtime by enabling regulation until VIN drops to 2.12V, increasing effective capacity by ~8% versus higher-dropout alternatives. | Use Scenario: Supplying 2.0V bias to RF front-end ICs and baseband processors in 4G/LTE handsets. IC Role / Device Role / Timing Role: Low-noise post-regulator stabilizing switched-mode supply outputs to meet stringent RF spectral mask requirements. Use Value: 115μVRMS output noise and 70dB PSRR at 100Hz prevent AM-to-PM distortion in power amplifiers and maintain EVM compliance. |
| USB Hubs | Palmtop Computers |
Use Scenario: Providing 2.0V VCC for USB 2.0 transceivers and hub controller logic in bus-powered desktop hubs. IC Role / Device Role / Timing Role: Load-switch-capable LDO with POK output synchronized to VOUT ramp for hot-plug detection and enumeration timing. Use Value: Active-low POK asserts within 10ms of VOUT reaching 93% of 2.0V, satisfying USB 2.0 suspend/resume timing budgets without external monitoring circuitry. | Use Scenario: Regulating 2.0V for ASIC core logic and display driver interfaces in legacy palmtop PDAs with AA/AAA battery packs. IC Role / Device Role / Timing Role: High-efficiency LDO operating from 2.5V–5.5V input range, supporting both alkaline and NiMH battery chemistries. Use Value: 0.1μA shutdown current preserves battery charge during weeks of standby, critical for always-on PDA functionality with infrequent user interaction. |
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 |
|---|---|---|---|
| TPS76320QDBVRQ1 | 2.0V fixed, 150mA output, 120mV dropout at 150mA, 85μA IQ - lower current rating and no POK output. | Suitable only for sub-150mA loads; lacks power-good signaling needed for microcontroller reset coordination. | Select when cost sensitivity outweighs current and monitoring requirements; not drop-in for 500mA or POK-dependent designs. |
| MCP1702T-2002E/MB | 2.0V fixed, 250mA output, 600mV dropout at 250mA, 2.5μA IQ - higher dropout limits usable input range; no thermal shutdown or POK. | Applicable in low-power sensor nodes where thermal margin is ample and reset sequencing is handled externally. | Choose only for space-constrained, ultra-low-IQ applications with light loads and no fault monitoring needs. |
Compared with TPS76320QDBVRQ1 and MCP1702T-2002E/MB, the MAX1818EUT20#TG16 uniquely delivers 500mA output with integrated POK, thermal shutdown, and 120mV dropout - making it the sole option among the three qualified for thermally demanding, high-current, safety-critical portable power rails.
Availability
MAX1818EUT20#TG16 is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and USB hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1818EUT20#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 battery-powered portable electronics requiring high output current, ultra-low quiescent current, and integrated power-monitoring features in minimal footprint packages.
FAQ
What is the exact output voltage tolerance of the MAX1818EUT20#TG16 over temperature?
The MAX1818EUT20#TG16 guarantees ±2.5% output voltage accuracy over the full -40°C to +85°C operating temperature range at 100mA load. At room temperature (+25°C), it achieves tighter ±1% tolerance for 2.0V nominal output. This specification accounts for initial trim, line/load regulation, and thermal drift - verified across production lots per Maxim's datasheet test conditions.
Does the MAX1818EUT20#TG16 require external components for stable operation?
Yes, the MAX1818EUT20#TG16 requires a 1μF ceramic capacitor between IN and GND, and a 3.3μF low-ESR (≤0.1Ω) ceramic capacitor between OUT and GND for stable operation across temperature and load. For VOUT < 2.0V, a 4.7μF output capacitor is recommended. These values are specified in the datasheet and validated for phase margin >45° and load-transient response <8mV overshoot.
Can the MAX1818EUT20#TG16 be used in adjustable mode despite its 2.0V preset suffix?
Yes, the MAX1818EUT20#TG16 supports adjustable mode via the SET pin. When SET is connected to a resistive divider between OUT and GND (not to GND), the device regulates to VOUT = 1.25V × (1 + R1/R2), enabling outputs from 1.25V to 5.0V. The "20" suffix indicates factory-trimmed 2.0V default, but Dual Mode™ allows seamless reconfiguration without changing the part number.
What is the maximum continuous power dissipation for the MAX1818EUT20#TG16 in its SOT23-6 package?
The MAX1818EUT20#TG16 has a maximum continuous power dissipation of 800mW at +70°C ambient, with 10mW/°C derating above that temperature. This assumes PCB layout with one square-inch of copper shared equally among IN, OUT, and GND pins. With minimal copper, dissipation drops to 712mW at +70°C - a critical constraint when calculating worst-case (VIN – VOUT) × IOUT in thermal design.
How does the POK output of the MAX1818EUT20#TG16 behave during shutdown?
During shutdown (SHDN = GND), the POK output of the MAX1818EUT20#TG16 is actively held low regardless of VOUT level - this is explicitly defined in the datasheet. It does not float or go high-impedance. This behavior ensures deterministic reset signaling to host microcontrollers even when the regulator is disabled, supporting reliable system-level power sequencing.
MAX1818EUT20#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 (2V)
- 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
MAX1818EUT20#TG16 FAQ
1.How can I place an order for MAX1818EUT20#TG16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT20#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 MAX1818EUT20#TG16 reliable?
The price and inventory of MAX1818EUT20#TG16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT20#TG16 is usually 5 days.
3.What payment methods are accepted for MAX1818EUT20#TG16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT20#TG16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT20#TG16?
MAX1818EUT20#TG16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT20#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 MAX1818EUT20#TG16?
For technical support, including MAX1818EUT20#TG16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT20#TG16 requirements.
6.How does Aetrix verify that MAX1818EUT20#TG16 is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT20#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 MAX1818EUT20#TG16 meets industry standards.
7.What is the process for return or replacement of MAX1818EUT20#TG16?
All MAX1818EUT20#TG16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT20#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 MAX1818EUT20#TG16 part is unused and in its original packaging.
Return procedure for MAX1818EUT20#TG16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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