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Analog Devices Inc./Maxim Integrated MAX1806EUA33+T
- Part No.:
- MAX1806EUA33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX1806EUA33+T.pdf
- Description:
- IC REG LIN POS ADJ 500MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,241
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Product details
Overview
MAX1806EUA33+T from Maxim Integrated is a 3.3V fixed-output, 500mA low-dropout linear regulator featuring ±1% output voltage accuracy, 175mV dropout at full load, and 210μA ground current. It uses an internal PMOS pass transistor and includes active-low power-OK (POK) monitoring, thermal shutdown, and 0.02μA shutdown current. It is designed for space-constrained portable power rails in USB hubs, docking stations, and cellular handsets.
For engineers reviewing the MAX1806EUA33+T datasheet, MAX1806EUA33+T pinout, MAX1806EUA33+T application, or MAX1806EUA33+T equivalent, key selection criteria include guaranteed 500mA output under 175mV dropout, preset 3.3V accuracy over -40°C to +85°C, POK threshold at 93% of nominal, and compatibility with 1μF/10μF ceramic input/output capacitors.
Technical Context
The MAX1806EUA33+T implements a dual-mode feedback architecture: when SET is grounded, it operates in factory-preset 3.3V mode using an internal resistive divider referenced to an 800mV bandgap; when external resistors are connected to SET, it regulates to VOUT = 0.8V × (1 + R1/R2). Its P-channel MOSFET pass device eliminates base-drive current, enabling stable low-quiescent operation across load and temperature.
Thermal protection activates at +170°C junction temperature with 20°C hysteresis, and the open-drain POK output asserts low when VOUT falls below 93% of 3.3V (i.e., ≤3.069V), sinking 2mA with VOL ≤50mV. Shutdown is controlled by an active-low SHDN pin with VIH ≥1.6V and VIL ≤0.6V, independent of VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (guaranteed over -40°C to +85°C, 1mA–500mA load) |
| Max Output Current | 500mA RMS continuous; short-circuit protected up to 2.5A peak |
| Dropout Voltage | 175mV at 500mA (measured at VOUT = 3.3V; enables operation down to VIN = 3.475V) |
| Ground Current | 210μA at 1mA load; increases to 575μA at 500mA - enables battery life extension in standby |
| Shutdown Current | 0.02μA typical (max 5μA) - supports ultra-low-power system sleep states |
| Power-OK Threshold | 93% of nominal (3.069V); open-drain POK sinks 2mA with VOL ≤50mV |
| Operating Input Range | +2.25V to +5.5V - compatible with single-cell Li-ion, 3.3V/5V rails, and USB power |
Pinout & Package
MAX1806EUA33+T is housed in an 8-pin Power-μMAX package (1.3W thermal rating) with an exposed metal thermal pad on the underside for PCB heat sinking. The package measures 3mm × 3mm × 0.8mm and requires soldering of both GND pin (5) and the exposed pad to a large copper ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IN | Regulator input supply | Accepts +2.25V to +5.5V; must be bypassed with 1μF ceramic capacitor to GND |
| 3 POK | Open-drain, active-low power-OK output | Asserts low when VOUT < 3.069V; requires 100kΩ pullup to OUT for logic-level signaling |
| 4 SHDN | Active-low shutdown control | Pull low to reduce IQ to 0.02μA; valid up to +6V regardless of VIN/VOUT |
| 5 GND | Power and signal ground | Primary ground return; exposed thermal pad must be soldered to PCB ground for thermal performance |
| 6 SET | Voltage-setting input | Internally tied to 800mV reference; grounded for 3.3V preset mode; used with external divider for adjustable outputs |
| 7, 8 OUT | Regulated 3.3V output | Sources up to 500mA; bypassed with 10μF low-ESR (<0.1Ω) ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.3V output | ±1% accuracy over full temperature and load range - eliminates external resistor calibration |
| P-channel MOSFET pass element | 0.4Ω RDS(ON); enables low dropout without base-drive current penalty - improves efficiency vs. PNP-based LDOs |
| Integrated thermal shutdown | Activates at +170°C with 20°C hysteresis - prevents damage during sustained overload or poor heatsinking |
| Low-noise regulation | 300μVRMS output noise (10Hz–1MHz); PSRR >60dB at 1kHz - suitable for RF and precision analog supplies |
| Dual-mode feedback architecture | Automatic selection between internal preset divider and external SET-resistor network - supports both fixed and flexible designs |
Applications
| Notebook Computers | Cellular Telephones |
|---|---|
Use Scenario: Providing clean 3.3V bias to baseband processors and RF transceivers in clamshell and slider form factors. IC Role / Device Role / Timing Role: Primary core voltage regulator delivering stable 3.3V at up to 500mA with fast load-transient response (≤40mV overshoot). Use Value: Enables extended battery runtime via 210μA quiescent current and seamless transition into 0.02μA shutdown during idle periods. | Use Scenario: Powering USB PHY, camera modules, and touch controllers in multi-rail smartphone power architectures. IC Role / Device Role / Timing Role: Secondary LDO supplying noise-sensitive peripherals from a shared 3.3V system rail. Use Value: Delivers 3.3V ±1% accuracy and 300μVRMS noise - meets USB 2.0 signal integrity requirements and reduces EMI-induced bit errors. |
| USB Hubs | Docking Stations |
Use Scenario: Regulating 3.3V for USB controller ICs, hub repeaters, and status LEDs in bus-powered and self-powered hubs. IC Role / Device Role / Timing Role: Standby-capable LDO with POK monitoring to coordinate upstream port enumeration and fault reporting. Use Value: POK output signals microcontroller when VOUT drops below 3.069V - enables graceful USB disconnect handling and overcurrent recovery. | Use Scenario: Supplying 3.3V to PCIe switch logic, SATA bridge controllers, and hot-swap supervisors in laptop docking solutions. IC Role / Device Role / Timing Role: High-reliability LDO with thermal shutdown and short-circuit protection for high-temperature dock environments. Use Value: 1.3W Power-μMAX package with exposed thermal pad sustains 500mA output at +85°C ambient - avoids derating in compact enclosures. |
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 |
|---|---|---|---|
| TPS76333DBVR | 3.3V fixed, 150mA max output, 120mV dropout at 150mA, SOT-23-5 package | Limited to lower-current peripherals; lacks POK output and thermal hysteresis | Choose only for cost-sensitive, sub-200mA applications where POK monitoring is unnecessary |
| MCP1703T-3302E/MB | 3.3V fixed, 250mA max output, 600mV dropout at 250mA, SOT-23-5 package | Higher dropout limits usable input range; no POK or thermal hysteresis; higher quiescent current (2.5μA) | Select when board space is critical and thermal margin exceeds 30°C; not suitable for USB or docking station loads |
Compared with TPS76333DBVR and MCP1703T-3302E/MB, the MAX1806EUA33+T uniquely supports 500mA at 175mV dropout with integrated POK monitoring and thermal hysteresis - making it the only option qualified for thermally demanding, high-current USB hub and docking station power rails.
Availability
MAX1806EUA33+T 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 MAX1806EUA33+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX1806 product line delivers low-noise, low-quiescent-current LDOs optimized for portable and battery-powered systems where efficiency, small size, and reliable power sequencing are essential.
FAQ
What is the guaranteed output voltage accuracy of the MAX1806EUA33+T over temperature and load?
The MAX1806EUA33+T guarantees ±1% output voltage accuracy over the full operating temperature range (-40°C to +85°C) and load current range (1mA to 500mA), provided VIN ≥ VOUT + 0.5V. At +85°C and 100mA load, accuracy remains within ±1%; worst-case drift across all conditions is ±4% per the datasheet's extended specification table.
Does the MAX1806EUA33+T require external resistors to set its 3.3V output?
No. The MAX1806EUA33+T is factory-trimmed for 3.3V fixed output. The SET pin must be connected directly to GND to activate preset mode - no external resistors are needed. The "33" suffix in the part number explicitly denotes the 3.3V configuration, and internal trimming ensures ±1% accuracy without user calibration.
What is the minimum input voltage required for the MAX1806EUA33+T to maintain regulation at 500mA load?
The MAX1806EUA33+T requires a minimum input voltage of 3.475V to maintain 3.3V regulation at 500mA load, based on its guaranteed 175mV dropout voltage. In practice, the datasheet specifies VIN ≥ VOUT + 0.5V (i.e., ≥3.8V) for full accuracy compliance, but operation down to VIN = 3.475V is functional with minor tolerance relaxation.
How does the POK output of the MAX1806EUA33+T behave during shutdown?
During shutdown (SHDN = GND), the POK output of the MAX1806EUA33+T is actively held low regardless of the output voltage level. This behavior is specified in the datasheet: "When in shutdown, POK is held low independent of the output voltage." It provides unambiguous power-fault signaling to host microcontrollers even when the regulator is disabled.
Can the MAX1806EUA33+T be used with ceramic output capacitors, and what ESR requirement applies?
Yes, the MAX1806EUA33+T is fully compatible with ceramic output capacitors. The datasheet mandates an output capacitor ESR ≤0.1Ω for stability and optimal transient response. A 10μF X5R/X7R ceramic capacitor (typical ESR ≈10–30mΩ) satisfies this requirement and is recommended in the Typical Operating Circuit.
MAX1806EUA33+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V (3.3V)
- Voltage - Output (Max):
- 4.5V
- Voltage Dropout (Max):
- -
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 400 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:
- 8-uMAX-EP|8-uSOP-EP
MAX1806EUA33+T FAQ
1.How can I place an order for MAX1806EUA33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1806EUA33+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 MAX1806EUA33+T reliable?
The price and inventory of MAX1806EUA33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1806EUA33+T is usually 5 days.
3.What payment methods are accepted for MAX1806EUA33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1806EUA33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1806EUA33+T?
MAX1806EUA33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1806EUA33+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 MAX1806EUA33+T?
For technical support, including MAX1806EUA33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1806EUA33+T requirements.
6.How does Aetrix verify that MAX1806EUA33+T is sourced from the original manufacturer or authorized distributors?
All MAX1806EUA33+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 MAX1806EUA33+T meets industry standards.
7.What is the process for return or replacement of MAX1806EUA33+T?
All MAX1806EUA33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1806EUA33+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 MAX1806EUA33+T part is unused and in its original packaging.
Return procedure for MAX1806EUA33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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