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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 LINEAR 500MA LOW VOLT
- Quantity:
- Payment:
- Shipping:
Inventory:4,799
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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, 0.02µA shutdown current, and thermal/short-circuit protection - deployed in portable power rails for 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 operation without external feedback, POK threshold at 93% of nominal output, thermal shutdown at +170°C, and compatibility with 1µF input / 10µF low-ESR output capacitors.
Technical Context
The MAX1806EUA33-T implements a precision 0.8V internal reference with error amplifier control of a 0.4Ω PMOS pass transistor, enabling low-quiescent-current regulation without base-drive losses. Its Dual Mode™ architecture automatically selects preset regulation when SET = GND, eliminating external resistor networks for fixed-voltage use.
Power-OK detection compares VOUT against 93% of nominal (3.069V for 3.3V output) using an open-drain N-channel output requiring external pullup; shutdown logic disconnects IN from OUT while sinking only 0.02µA, and thermal protection cycles the pass device above +170°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over -40°C to +85°C, 1mA–500mA load - ensures stable core I/O rail for USB 2.0 PHYs and baseband processors. |
| Dropout Voltage | 175mV at 500mA - enables operation down to VIN = 3.475V, extending battery life in single-cell Li-ion systems. |
| Ground Current | 210µA at 1mA load, 575µA at 500mA - minimizes standby power loss in always-on subsystems. |
| Shutdown Current | 0.02µA - supports ultra-low-power sleep modes in PDAs and cordless handsets. |
| POK Threshold | 93% of nominal (3.069V), rising-edge detection - provides reliable power-fail warning before brownout resets microcontrollers. |
| Thermal Shutdown | +170°C activation with +20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| Input Voltage Range | +2.25V to +5.5V - supports direct connection to Li-ion batteries (2.7–4.2V), 3.3V/5V system rails, and USB VBUS. |
Pinout & Package
The MAX1806EUA33-T is housed in an 8-pin Power-µMAX package with exposed thermal pad on the underside, rated for 1.3W continuous dissipation at +70°C (derated 17mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IN | Regulator input supply | Dual pins internally connected; accept +2.25V to +5.5V input; require 1µF bypass to GND for stability. |
| 3 POK | Open-drain, active-low power-OK output | Pulls low when VOUT < 3.069V; requires 100kΩ pullup to OUT for logic-level signaling to µC reset or status monitoring. |
| 4 SHDN | Active-low shutdown control | Drives low to reduce supply current to 0.02µA; tolerates up to +6V regardless of VIN/VOUT; connect to IN for normal operation. |
| 5 GND | Power and signal ground | Shared with exposed thermal pad; must be soldered to large PCB ground plane or multiple vias for thermal management. |
| 6 SET | Voltage-setting input | Internally tied to GND for 3.3V preset mode; left unconnected or grounded - no external resistors required for MAX1806EUA33-T. |
| 7, 8 OUT | Regulated 3.3V output | Dual pins internally connected; source up to 500mA; require 10µF low-ESR (≤0.1Ω) capacitor to GND for transient stability. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 500mA output current | Delivers full-rated load across -40°C to +85°C without derating - suitable for powering FPGA I/O banks or RF front-end bias rails. |
| ±1% output voltage accuracy | Tight tolerance maintained over temperature and line/load - eliminates need for post-regulation trimming in USB-compliant 3.3V interfaces. |
| Low 175mV dropout at 500mA | Enables >95% efficiency at 3.3V output with 3.6V Li-ion input - critical for maximizing runtime in handheld medical devices. |
| Active-low POK with 93% threshold | Provides deterministic power-fail indication before system reset thresholds are violated - simplifies firmware power sequencing. |
| 0.02µA shutdown current | Reduces battery drain to nanowatt level during deep-sleep - extends shelf life in remote sensor nodes and IoT edge devices. |
Applications
| USB Hub Power Management | Cellular Handset Baseband Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 3.3V to USB 2.0 transceivers and hub controllers in portable docking stations. IC Role / Device Role / Timing Role: Primary LDO delivering stable VCC_IO for high-speed data interface circuitry with tight noise and transient requirements. Use Value: 300µVRMS output noise and 40mV load-transient overshoot (5mA→500mA) ensure signal integrity and compliance with USB electrical specifications. |
Use Scenario: Supplying 3.3V to baseband processors and audio codecs in dual-mode GSM/CDMA handsets. IC Role / Device Role / Timing Role: Main system LDO supporting dynamic voltage scaling and rapid wake-from-sleep transitions. Use Value: 210µA quiescent current and 0.02µA shutdown current minimize idle power, directly extending talk time and standby duration. |
| Industrial Docking Station Auxiliary Rail | PDAs and Palmtop Computer Core Logic |
|
Use Scenario: Generating isolated 3.3V for peripheral expansion slots and hot-plug detection circuits in ruggedized docking stations. IC Role / Device Role / Timing Role: Fault-tolerant auxiliary regulator with integrated short-circuit and thermal protection for unattended operation. Use Value: Continuous short-circuit capability and +170°C thermal shutdown prevent field failures during connector mating faults or ESD events. |
Use Scenario: Powering ARM-based application processors and SRAM in space-constrained palmtop computers. IC Role / Device Role / Timing Role: Compact, thermally efficient LDO enabling thin form factors via exposed-pad thermal path to PCB ground plane. Use Value: 1.3W power dissipation rating and metal thermal pad allow full 500mA output without external heatsinks in 5mm × 5mm footprint. |
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 output, 220mV dropout at 150mA, SOT-23-5 package | Limited to lower current; lacks POK output and thermal cycling protection | Select when board space is critical and load ≤150mA; not suitable for 500mA USB hub or docking station rails. |
| MCP1825-3302E/DB | 3.3V fixed, 500mA output, 300mV dropout at 500mA, SOT-223-3 package | Higher dropout reduces usable input range; no POK output; 100µA quiescent current | Acceptable for cost-sensitive industrial controls where 3.3V input margin exists, but inferior for battery-powered portables. |
Compared with TPS76333DBVR and MCP1825-3302E/DB, the MAX1806EUA33-T uniquely combines 500mA capability, 175mV dropout, integrated POK monitoring, and sub-µA shutdown - making it the only option among the three qualified for high-current, battery-sensitive, and fault-aware portable power designs.
Availability
MAX1806EUA33-T is available at Aetrix Electronics and suitable for USB hubs, cellular handset baseband supplies, and industrial docking stations requiring stable component supply, long-term lifecycle support, and traceable sourcing.
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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and consumer applications.
The MAX1806 series was developed specifically for ultra-low-power, high-current portable LDO applications - emphasizing minimal dropout, sub-µA shutdown, and integrated power-good signaling in miniature packages.
FAQ
What is the guaranteed output voltage tolerance for MAX1806EUA33-T across temperature and load?
The MAX1806EUA33-T guarantees ±1% output voltage accuracy over -40°C to +85°C and 1mA to 500mA load current, with VIN ≥ VOUT + 0.5V. This specification is verified across production lots and ensures reliable 3.3V rail generation for USB-compliant interfaces without external trimming. The MAX1806EUA33-T achieves this via factory-trimmed internal feedback and a precision 0.8V reference.
Does MAX1806EUA33-T require external resistors to set its 3.3V output?
No, the MAX1806EUA33-T has its 3.3V output preset internally - the "33" suffix indicates factory-trimmed regulation, and the SET pin is internally connected to GND. External resistors are unnecessary; connecting SET to GND (or leaving it unconnected) activates preset mode. The MAX1806EUA33-T is designed for drop-in replacement in fixed-voltage applications without layout changes.
What is the minimum input voltage required for MAX1806EUA33-T to maintain regulation at 500mA?
The MAX1806EUA33-T requires a minimum input voltage of 3.475V to maintain 3.3V output at 500mA, based on its guaranteed 175mV dropout. Below this, output voltage collapses linearly. Input undervoltage lockout activates at ~2.0V (rising), preventing erratic behavior during brownout - a critical safeguard for the MAX1806EUA33-T in battery-powered systems.
How does the POK output of MAX1806EUA33-T interface with a microcontroller?
The POK output of MAX1806EUA33-T is an open-drain N-channel driver that pulls low when VOUT falls below 3.069V (93% of 3.3V). To interface with a microcontroller, connect a 100kΩ pullup resistor from POK to OUT - this yields a clean logic-high when regulated and logic-low during fault. The MAX1806EUA33-T POK signal can trigger µC interrupts or reset lines without additional level-shifting.
Can MAX1806EUA33-T safely operate without the exposed thermal pad soldered to PCB ground?
No - the MAX1806EUA33-T's exposed thermal pad is electrically connected to GND and is essential for thermal performance. Without soldering it to a large PCB ground plane or multiple thermal vias, junction temperature will exceed +150°C under 500mA load, triggering thermal shutdown. The MAX1806EUA33-T datasheet mandates thermal pad connection to maintain 1.3W power dissipation capability and ensure reliability.
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:
- Bulk
- 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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