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Analog Devices Inc./Maxim Integrated MAX1806EUA08
- Part No.:
- MAX1806EUA08
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX1806EUA08.pdf
- Description:
- IC REG LINEAR 500MA LOW VOLT
- Quantity:
- Payment:
- Shipping:
Inventory:6,097
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Product details
Overview
MAX1806EUA08 from Maxim Integrated is a 500mA low-dropout linear regulator with preset 0.8V output, ±1% accuracy over -40°C to +85°C, 175mV dropout at full load, and internal PMOS pass transistor. It delivers stable low-voltage power for core logic rails in portable and space-constrained systems including USB hubs and palmtop computers.
For engineers reviewing the MAX1806EUA08 datasheet, MAX1806EUA08 pinout, MAX1806EUA08 application, or MAX1806EUA08 equivalent, key selection criteria include guaranteed 0.8V preset output, 210µA ground current, active-low POK indicator, 0.02µA shutdown current, and thermal/short-circuit protection in the 8-pin Power-µMAX package.
Technical Context
The MAX1806EUA08 uses an internal 0.8V reference and error amplifier to regulate output via a 0.4Ω P-channel MOSFET pass transistor - eliminating base-drive current and minimizing dropout under load. Its Dual Mode™ architecture selects between factory-trimmed preset mode (SET = GND) and adjustable mode (external resistor divider on SET) based on VSET threshold of 35–125mV.
Power-OK (POK) is an open-drain output asserting low when VOUT falls below 89–97% of nominal voltage; it requires a 100kΩ pullup to OUT. Shutdown is controlled by active-low SHDN, reducing supply current to 0.02µA while forcing POK low and disconnecting IN from OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 0.8V ±1% (guaranteed over -40°C to +85°C, 1mA–500mA load) |
| Dropout Voltage | 175mV at 500mA (enables operation down to VIN = 0.975V, critical for end-of-battery life) |
| Ground Current | 210µA at 1mA load (low quiescent current extends battery runtime in always-on circuits) |
| Shutdown Current | 0.02µA (supports ultra-low-power sleep states in portable devices) |
| Input Voltage Range | +2.25V to +5.5V (compatible with Li-ion, Li-poly, and 3.3V/5V system rails) |
| Thermal Protection | 170°C shutdown with 20°C hysteresis (prevents permanent damage during sustained overload) |
| Current Limit | 700–2500mA short-circuit limit (sustains indefinite output short without latch-up) |
Pinout & Package
The MAX1806EUA08 is housed in an 8-pin Power-µMAX package with exposed thermal pad on the underside for enhanced heat dissipation. The package measures 3mm × 3mm × 0.8mm and requires soldering of both GND pin and the exposed pad to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - IN | Regulator input supply | Accepts +2.25V to +5.5V; must be bypassed with 1µF capacitor to GND; pins are internally connected and must be tied together externally |
| 3 - POK | Open-drain, active-low Power-OK output | Asserts low when VOUT < 89–97% of 0.8V; requires 100kΩ pullup to OUT for logic-level signaling to µC or LED |
| 4 - SHDN | Active-low shutdown control | Drives device into 0.02µA shutdown state; tolerates up to +6V regardless of VIN/VOUT; connect to IN for normal operation |
| 5 - GND | Ground reference and thermal path | Serves as electrical ground and primary heatsink; exposed pad must be soldered to large copper area or ground plane |
| 6 - SET | Voltage-setting input | Internally biased to 0.8V reference; grounded for 0.8V preset mode; used with external divider for adjustable outputs (0.8V–4.5V) |
| 7, 8 - OUT | Regulated output | Sources up to 500mA; bypassed with 10µF low-ESR capacitor to GND; pins are internally connected and must be tied together externally |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Output Selection | Factory-trimmed 0.8V preset (SET = GND) or adjustable 0.8V–4.5V (external R-divider), selected automatically by VSET voltage level |
| P-Channel MOSFET Pass Transistor | 0.4Ω RDS(ON) enables low dropout and eliminates base-drive current - reducing ground current vs. PNP-based regulators |
| Power-OK (POK) Monitoring | Guaranteed detection of output undervoltage (threshold 89–97% of nominal) with open-drain output for flexible interfacing to µC or status LEDs |
| Ultra-Low Shutdown Current | 0.02µA shutdown supply current enables multi-week battery hold-up in standby without significant drain |
| Robust Fault Protection | Integrated thermal shutdown (170°C), short-circuit current limiting (700–2500mA), and undervoltage lockout (1.85–2.15V) |
Applications
| USB Hubs | Palmtop Computers |
|---|---|
|
Use Scenario: Providing clean, low-noise 0.8V core supply for USB controller ICs and PHYs in bus-powered hubs. IC Role / Device Role / Timing Role: Primary LDO delivering regulated 0.8V rail with tight DC accuracy and fast transient response to handle dynamic USB packet bursts. Use Value: Enables compliance with USB 2.0/3.0 core voltage tolerance (±3%) while maintaining 175mV dropout headroom at 500mA peak load. |
Use Scenario: Powering ARM9 or MIPS-based application processors requiring precise 0.8V core voltage in handheld computing devices. IC Role / Device Role / Timing Role: Core voltage regulator supplying CPU core logic with ±1% accuracy and thermal foldback during sustained compute loads. Use Value: Delivers guaranteed 500mA at 0.8V with 210µA quiescent current - extending battery life in always-on UI and background sync modes. |
| Cellular Telephones | Docking Stations |
|
Use Scenario: Generating 0.8V bias for RF transceiver baseband processors and memory interfaces in dual-mode GSM/UMTS handsets. IC Role / Device Role / Timing Role: Low-noise, low-dropout regulator supporting voltage scaling during burst transmission and deep-sleep states. Use Value: 300µVRMS output noise and 0.02µA shutdown current meet stringent RF coexistence and standby current requirements. |
Use Scenario: Supplying auxiliary 0.8V logic rails for PCIe switch controllers and USB-C PD protocol ICs inside laptop docking stations. IC Role / Device Role / Timing Role: Secondary LDO providing isolated, fault-protected 0.8V domain independent of main system rail. Use Value: Integrated POK output signals microcontroller when 0.8V rail stabilizes - enabling safe initialization sequence for high-speed peripherals. |
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 |
|---|---|---|---|
| TPS7A0508PDBVR | 0.8V fixed output, 200mA max, 170mV dropout at 200mA, SOT-23-5 package | Limited to 200mA; lacks POK output and thermal shutdown hysteresis | Choose for cost-sensitive, lower-current designs where POK monitoring is unnecessary |
| MCP1804T-0802I/OT | 0.8V fixed output, 150mA max, 240mV dropout at 150mA, SOT-23-5 package | Lower current capability and higher dropout; no shutdown or POK functionality | Use only in ultra-low-power, non-critical subsystems where 150mA suffices and fault reporting is omitted |
Compared with TPS7A0508PDBVR and MCP1804T-0802I/OT, the MAX1806EUA08 uniquely supports 500mA at 0.8V with integrated POK, thermal hysteresis, and 0.02µA shutdown - making it suitable for higher-power portable applications requiring robust supervision and regulation integrity.
Availability
MAX1806EUA08 is available at Aetrix Electronics and suitable for USB hubs, palmtop computers, cellular telephones, docking stations, and base stations requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX1806EUA08 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 series was designed specifically for portable electronics requiring ultra-low quiescent current, precise low-voltage regulation, and comprehensive fault protection in miniature packages.
FAQ
What is the exact preset output voltage of the MAX1806EUA08?
The MAX1806EUA08 is factory-trimmed to deliver a precise 0.8V output voltage with ±1% accuracy over the full operating temperature range (-40°C to +85°C) and load current (1mA to 500mA). This value is confirmed in the Selector Guide and Electrical Characteristics tables, where VOUT = 774–826mV at TA = +85°C and IOUT = 1–500mA.
Does the MAX1806EUA08 require external resistors to achieve its 0.8V output?
No, the MAX1806EUA08 delivers its 0.8V output in preset mode without external components - simply tie the SET pin to GND. The internal feedback divider is laser-trimmed during manufacturing, and the "08" suffix in the part number explicitly denotes the 0.8V preset variant per the official Selector Guide.
What is the function of the POK pin on the MAX1806EUA08?
The POK (Power-OK) pin on the MAX1806EUA08 is an open-drain, active-low output that asserts low when the regulated 0.8V output falls below 89–97% of nominal (i.e., below ~0.712V–0.776V). It requires a 100kΩ pullup resistor to OUT and is used to signal microcontrollers or drive status indicators when regulation is lost.
Can the MAX1806EUA08 be used in dropout conditions?
Yes - the MAX1806EUA08 maintains regulation with only 175mV dropout at 500mA, allowing operation with VIN as low as 0.975V (0.8V + 0.175V). Its P-channel MOSFET architecture ensures stable performance near dropout, as verified in Typical Operating Characteristics Figure toc04 and toc05.
How is thermal management implemented in the MAX1806EUA08 package?
The MAX1806EUA08 uses an 8-pin Power-µMAX package with an exposed metal thermal pad on the underside. For effective thermal management, this pad and Pin 5 (GND) must be soldered to a large PCB copper area or ground plane using multiple vias - reducing junction-to-ambient thermal resistance and enabling continuous 500mA operation at +85°C ambient.
MAX1806EUA08 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 (0.8V)
- 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
MAX1806EUA08 FAQ
1.How can I place an order for MAX1806EUA08 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1806EUA08 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 MAX1806EUA08 reliable?
The price and inventory of MAX1806EUA08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1806EUA08 is usually 5 days.
3.What payment methods are accepted for MAX1806EUA08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1806EUA08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1806EUA08?
MAX1806EUA08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1806EUA08 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 MAX1806EUA08?
For technical support, including MAX1806EUA08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1806EUA08 requirements.
6.How does Aetrix verify that MAX1806EUA08 is sourced from the original manufacturer or authorized distributors?
All MAX1806EUA08 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 MAX1806EUA08 meets industry standards.
7.What is the process for return or replacement of MAX1806EUA08?
All MAX1806EUA08 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1806EUA08, 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 MAX1806EUA08 part is unused and in its original packaging.
Return procedure for MAX1806EUA08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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