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Analog Devices Inc./Maxim Integrated MAX1818EUT33#TG16
- Part No.:
- MAX1818EUT33#TG16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT33#TG16.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:3,125
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Product details
Overview
MAX1818EUT33#TG16 from Maxim Integrated is a 3.3V fixed-output, 500mA low-dropout linear regulator with ±1% output voltage accuracy, 120mV dropout at full load, and 125μA ground current. It features an active-low open-drain POK output, 0.1μA shutdown current, and thermal/short-circuit protection. Designed for portable battery-powered systems, it powers core logic rails in notebook computers and USB hubs.
For engineers reviewing the MAX1818EUT33#TG16 datasheet, MAX1818EUT33#TG16 pinout, MAX1818EUT33#TG16 application, or MAX1818EUT33#TG16 equivalent, key selection criteria include guaranteed 500mA output under 120mV dropout, preset 3.3V regulation with no external feedback components, RoHS-compliant SOT23-6 packaging, and integrated power-ok monitoring for microcontroller sequencing.
Technical Context
The MAX1818EUT33#TG16 uses an internal P-channel MOSFET pass transistor with 0.25Ω RDS(ON), enabling low quiescent current independent of load. Its Dual Mode™ architecture selects preset regulation when SET is grounded, fixing VOUT at 3.3V per the suffix "33".
Power OK (POK) asserts low when VOUT falls below 93% of nominal (3.099V), with open-drain output requiring external pull-up. 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 | Fixed 3.3V ±1% at 100mA, -3% to +3% over full load/temperature range - ensures stable core rail for 3.3V logic interfaces. |
| Dropout Voltage | 120mV at 500mA (VOUT = 3.3V) - enables operation down to 3.42V input, extending usable battery life in single-cell Li-ion systems. |
| Ground Current | 125μA typical at light 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 (3.069V) with 3% hysteresis - provides reliable power-fail detection for safe microcontroller reset sequencing. |
| Thermal Shutdown | +170°C activation with +20°C hysteresis - protects against sustained overload without latch-off, enabling self-recovery in intermittent fault conditions. |
| Short-Circuit Limit | 0.55–1.8A depending on VOUT condition - prevents damage during output faults while supporting transient current surges up to 1.6A in regulation. |
Pinout & Package
Package: RoHS-compliant 6-pin SOT23-6 (U6FH-6), 800mW power dissipation rating at +70°C ambient, footprint compatible with industry-standard SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply connection | Accepts 2.5V–5.5V input; requires 1μF bypass capacitor to GND for stability and noise suppression. |
| 2 POK | Open-drain power-ok indicator | Pulls low when VOUT < 3.069V; 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; high-impedance OUT and forced-low POK during shutdown. |
| 4 GND | Power and signal reference | Common return path for IN, OUT, SET, and POK; must be connected to low-impedance PCB ground plane. |
| 5 SET | Voltage-setting input | Grounded for 3.3V preset mode; connects to external resistor 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 transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ voltage selection | Factory-trimmed 3.3V output with zero external components; SET pin enables field-adjustable operation (1.25V–5.0V) via resistor divider. |
| P-channel MOSFET pass element | Eliminates base-drive current loss, maintaining 125μA ground current across full 0–500mA load range and in dropout. |
| Integrated POK monitor | Provides deterministic power-fail signaling at 93% VOUT with open-drain output - replaces discrete supervisor ICs in space-constrained designs. |
| Thermal foldback protection | Shuts down at +170°C junction temperature and auto-recovers after 20°C cooldown - prevents permanent damage during sustained overload. |
| Low-noise operation | 115μVRMS output noise (10Hz–1MHz) with 3.3μF COUT - suitable for noise-sensitive analog and RF subsystems powered from same rail. |
Applications
| Notebook Computers | USB Hubs |
|---|---|
Use Scenario: Powering 3.3V PCIe link controllers and USB PHY transceivers in ultraportable notebooks with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator delivering clean, stable voltage with fast transient response to handle burst-mode data traffic. Use Value: 120mV dropout extends runtime by enabling operation until battery voltage drops to 3.42V, while ±1% accuracy ensures compliance with USB 3.x electrical specifications. |
Use Scenario: Supplying 3.3V to USB 2.0 hub controller ICs and downstream port power switches in compact docking stations. IC Role / Device Role / Timing Role: Local point-of-load regulator providing isolated, low-noise 3.3V for USB signaling integrity and ESD robustness. Use Value: 0.1μA shutdown current minimizes quiescent drain when hub is unpowered, and POK output enables host-side power-good confirmation before enumeration. |
| Cellular Telephones | Base Stations |
Use Scenario: Regulating 3.3V for application processors and PMIC interface logic in LTE smartphones with aggressive power cycling. IC Role / Device Role / Timing Role: Always-on auxiliary LDO supplying critical control rails during deep-sleep states with minimal leakage. Use Value: 125μA ground current and 0.1μA shutdown current directly reduce battery discharge rate, extending standby time beyond 72 hours. |
Use Scenario: Providing 3.3V bias to RF front-end amplifiers and digital control circuitry in small-cell base station remote radio units. IC Role / Device Role / Timing Role: High-reliability local regulator with thermal foldback protecting against enclosure overheating in sealed outdoor enclosures. Use Value: +170°C thermal shutdown threshold and 20°C hysteresis prevent latch-up during ambient temperature excursions, ensuring continuous operation in industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P332MR-G | 3.3V fixed, 300mA output, 250mV dropout at full load, no POK output, 1μA shutdown current | Lacks power-ok monitoring and thermal foldback; rated only for 300mA continuous output | Use where lower cost and smaller footprint are prioritized over 500mA capability and system-level fault detection. |
| Analog Devices ADP125ARHZ-3.3-R7 | 3.3V fixed, 500mA output, 135mV dropout at full load, 30μA quiescent current, no POK, no thermal foldback | Higher ground current, no integrated power-fail signaling, relies on external thermal protection | Select when board space allows external supervision and thermal monitoring, or when higher PSRR (>60dB @ 1kHz) is required. |
Compared with MAX1818EUT33#TG16, the XC6206P332MR-G offers lower cost but sacrifices 200mA output headroom and critical system-monitoring functions; the ADP125ARHZ-3.3-R7 matches output current but increases quiescent consumption by 240× and removes autonomous thermal recovery - making MAX1818EUT33#TG16 optimal for battery life and fault resilience in portable infrastructure.
Availability
MAX1818EUT33#TG16 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#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, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX1818 series targets portable battery-operated equipment, delivering high-current LDO regulation with ultra-low quiescent current, integrated supervision, and robust fault protection in minimal SOT23-6 footprint.
FAQ
What is the guaranteed output current for MAX1818EUT33#TG16 under all operating conditions?
The MAX1818EUT33#TG16 guarantees 500mA output current across the full -40°C to +85°C temperature range and input voltage range of 2.5V to 5.5V, provided the input-to-output differential remains above the specified dropout voltage. This rating is validated with proper PCB copper area and thermal management per the datasheet's derating guidelines.
Does MAX1818EUT33#TG16 require external components to operate at its preset 3.3V output?
No, MAX1818EUT33#TG16 operates at its factory-trimmed 3.3V output with only two mandatory external components: a 1μF input capacitor between IN and GND, and a 3.3μF low-ESR output capacitor between OUT and GND. The SET pin must be connected to GND to activate preset mode - no resistors or feedback network needed.
How does the POK output function on MAX1818EUT33#TG16, and what external component is required?
The POK output on MAX1818EUT33#TG16 is an open-drain N-channel driver that pulls low when VOUT falls below 93% of nominal (3.069V). To generate a logic-high signal during regulation, a 100kΩ pull-up resistor from POK to OUT is required. During shutdown, POK is forcibly held low regardless of output voltage.
What thermal protection behavior does MAX1818EUT33#TG16 exhibit during sustained overload?
When junction temperature exceeds +170°C, MAX1818EUT33#TG16 disables the pass transistor and enters thermal shutdown. After cooling by 20°C, it automatically resumes regulation - producing a pulsed output during continuous overload. This foldback behavior prevents permanent damage while allowing self-recovery once thermal stress is relieved.
Is MAX1818EUT33#TG16 compatible with standard SOT23-6 reflow profiles?
No - MAX1818EUT33#TG16 requires a specialized reflow profile compliant with IPC/JEDEC-J-STD-020A paragraph 7.6, Table 3 for IR/VPR and convection reflow. Hand soldering and wave soldering are prohibited. Preheating is mandatory, and peak temperature must not exceed +300°C for 10 seconds to avoid package damage.
MAX1818EUT33#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 (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#TG16 FAQ
1.How can I place an order for MAX1818EUT33#TG16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT33#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 MAX1818EUT33#TG16 reliable?
The price and inventory of MAX1818EUT33#TG16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT33#TG16 is usually 5 days.
3.What payment methods are accepted for MAX1818EUT33#TG16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT33#TG16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT33#TG16?
MAX1818EUT33#TG16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT33#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 MAX1818EUT33#TG16?
For technical support, including MAX1818EUT33#TG16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT33#TG16 requirements.
6.How does Aetrix verify that MAX1818EUT33#TG16 is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT33#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 MAX1818EUT33#TG16 meets industry standards.
7.What is the process for return or replacement of MAX1818EUT33#TG16?
All MAX1818EUT33#TG16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT33#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 MAX1818EUT33#TG16 part is unused and in its original packaging.
Return procedure for MAX1818EUT33#TG16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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