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Analog Devices Inc./Maxim Integrated MAX1806EUA18
- Part No.:
- MAX1806EUA18
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX1806EUA18.pdf
- Description:
- IC REG LINEAR 500MA LOW VOLT
- Quantity:
- Payment:
- Shipping:
Inventory:402
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Product details
Overview
MAX1806EUA18 from Maxim Integrated is a 500mA, low-dropout linear regulator with preset 1.8V output, ±1% accuracy over -40°C to +85°C, 175mV dropout at full load, and 210µA ground current - designed for power rail regulation in portable battery-powered systems such as PDAs, cellular handsets, and USB hubs.
For engineers reviewing the MAX1806EUA18 datasheet, MAX1806EUA18 pinout, MAX1806EUA18 application, or MAX1806EUA18 equivalent, this page delivers verified technical context, package mapping, real-world use cases, and validated alternative options for voltage regulation in space-constrained, low-power embedded designs.
Technical Context
The MAX1806EUA18 uses an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.4Ω) enabling low dropout and eliminating base-drive current loss typical of PNP regulators. Its Dual Mode™ architecture selects between factory-trimmed 1.8V output (SET = GND) or adjustable mode (0.8V–4.5V) via external resistor divider referenced to 800mV SET threshold.
It integrates active-low open-drain POK output asserting when VOUT falls below 93% of nominal, thermal shutdown at +170°C with 20°C hysteresis, short-circuit current limiting (700–2500mA), and 0.02µA shutdown supply current - all within a thermally enhanced 8-pin Power-µMAX package with exposed metal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 1.8V ±1% over -40°C to +85°C - ensures stable core logic or I/O rail without external feedback components. |
| Max Output Current | 500mA RMS - supports moderate-power microcontrollers, RF front-ends, or multi-peripheral USB hubs. |
| Dropout Voltage | 175mV at 500mA - enables operation down to VIN = 1.975V, extending usable battery life in single-cell Li-ion or Li-poly systems. |
| Ground Current | 210µA at 1mA load - minimizes quiescent power loss critical for always-on standby circuits. |
| Shutdown Current | 0.02µA - reduces system-level leakage during deep sleep, meeting ultra-low-power design targets. |
| POK Threshold | 93% of nominal VOUT - provides precise undervoltage detection for host µC reset or fault logging without external comparators. |
| Package Thermal Rating | 1.3W continuous at +70°C (derates 17mW/°C above) - requires PCB copper pour or vias to ground plane for safe 500mA operation at +85°C ambient. |
Pinout & Package
The MAX1806EUA18 is housed in an 8-pin Power-µMAX package (1.3W rating) with an exposed thermal pad on the underside - must be soldered to PCB ground plane for thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IN | Regulator input supply | Accepts +2.25V to +5.5V; both pins must be connected externally to reduce impedance and improve transient response. |
| 3 POK | Open-drain, active-low power-OK output | Signals µC when VOUT ≥ 93% of 1.8V; requires 100kΩ pullup to OUT for logic-high assertion. |
| 4 SHDN | Active-low shutdown control | Drives low to reduce supply current to 0.02µA; tolerates up to +6V regardless of VIN/VOUT. |
| 5 GND | Power and signal ground + thermal pad | Primary return path; exposed pad must be soldered to large ground area for thermal dissipation and noise reduction. |
| 6 SET | Voltage-setting input | Connected to GND for 1.8V preset mode; otherwise forms feedback node for adjustable output (VSET = 800mV). |
| 7, 8 OUT | Regulated output | Sources up to 500mA; both pins must be connected externally to minimize IR drop and improve current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ voltage selection | Factory-trimmed 1.8V output (SET = GND) or adjustable 0.8V–4.5V range - eliminates BOM variants while supporting multiple rail requirements. |
| P-channel MOSFET pass element | 0.4Ω RDS(ON) enables low dropout and zero base-drive current - improves efficiency vs. PNP-based LDOs under heavy load or near dropout. |
| Thermal shutdown with hysteresis | +170°C trip point with 20°C cooldown before restart - prevents latch-up during sustained overload while allowing recovery without manual reset. |
| Integrated current limit | 1.4A typical short-circuit limit - protects downstream circuitry and enables indefinite output shorting without damage. |
| Low-noise operation | 300µVRMS output noise (10Hz–1MHz) with 10µF COUT - suitable for noise-sensitive analog rails or RF subsystems. |
Applications
| Cellular Handset Core Rail | USB Hub VBUS Regulation |
|---|---|
|
Use Scenario: Powers baseband processor core voltage in dual-mode GSM/UMTS handsets operating from single-cell Li-ion battery (2.8V–4.2V). IC Role / Device Role / Timing Role: Low-noise, high-accuracy LDO delivering stable 1.8V core supply independent of battery voltage sag or load transients. Use Value: Enables reliable processor operation down to 1.975V input, extending talk time by >12% versus higher-dropout alternatives. |
Use Scenario: Regulates 5V USB VBUS to clean 1.8V for USB PHY interface logic and hub controller I/O banks. IC Role / Device Role / Timing Role: Primary post-regulator ensuring tight voltage tolerance and fast load-transient response for USB packet timing integrity. Use Value: 40mV typical overshoot during 5mA→500mA load step meets USB 2.0 VBUS ripple spec without additional filtering. |
| Industrial PDA Main Logic Supply | Docking Station Peripheral Interface |
|
Use Scenario: Supplies 1.8V to ARM9-based application processor and NAND flash in ruggedized handheld terminals used in warehouse logistics. IC Role / Device Role / Timing Role: Primary system LDO with POK monitoring for watchdog-triggered safe shutdown during brownout conditions. Use Value: ±1% output accuracy over temperature maintains memory interface timing margins across -20°C to +70°C operating range. |
Use Scenario: Provides isolated 1.8V rail for SDIO/MMC card slots and Bluetooth module interfaces in laptop docking stations. IC Role / Device Role / Timing Role: Secondary LDO decoupling high-speed digital interfaces from noisy main 3.3V/5V supplies. Use Value: 300µVRMS noise floor prevents bit errors in SDIO clock/data paths during concurrent high-bandwidth transfers. |
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 |
|---|---|---|---|
| TPS76318DBVR | 150mA max output, 220mV dropout at 150mA, SOT-23-5 package | Limited to low-current peripherals; lacks POK output and thermal hysteresis | Select only for cost-sensitive, sub-200mA applications where footprint and feature count are secondary. |
| MCP1700T-1802E/MB | 250mA max output, 178mV dropout at 250mA, SOT-23-3 package, no POK or SET pin | Fixed 1.8V only; no power-good signaling or adjustable mode - simpler but less flexible | Choose when board space is critical and system does not require POK monitoring or future voltage scalability. |
Compared with MAX1806EUA18, TPS76318DBVR offers smaller footprint but sacrifices 60% output current and key system-monitoring features; MCP1700T-1802E/MB trades adjustability and POK for ultra-low-cost and minimal pin count - making MAX1806EUA18 the optimal choice for 500mA, thermally demanding, or POK-dependent designs.
Availability
MAX1806EUA18 is available at Aetrix Electronics and suitable for cellular handset power management, USB peripheral regulation, and industrial PDA logic supply applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across temperature.
Supply support for MAX1806EUA18 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer markets.
The MAX1806 series was developed as a family of low-quiescent-current, thermally robust LDOs targeting portable electronics with stringent size, efficiency, and reliability requirements - particularly where battery life extension and system-level fault monitoring are critical.
FAQ
What is the maximum input voltage for the MAX1806EUA18?
The MAX1806EUA18 supports an input voltage range of +2.25V to +5.5V. Absolute maximum rating for IN, SHDN, POK, and SET pins is +6V relative to GND. Operation above +5.5V violates the specified operating conditions and may cause permanent damage or degraded reliability over time. Always ensure VIN remains within the 2.25V–5.5V window for guaranteed 1.8V output regulation and thermal safety.
Does the MAX1806EUA18 require external capacitors, and what values are recommended?
Yes, the MAX1806EUA18 requires two external capacitors: a 1µF ceramic capacitor between IN and GND, and a 10µF low-ESR (≤0.1Ω) capacitor between OUT and GND. These values ensure stability, transient response, and PSRR performance per Maxim's validated layout. Using smaller or higher-ESR capacitors risks oscillation or excessive output ripple - especially under dynamic load conditions like USB enumeration bursts.
How does the POK output function on the MAX1806EUA18?
The POK output on the MAX1806EUA18 is an open-drain N-channel driver that pulls low when VOUT drops below 93% of its nominal 1.8V value (i.e., <1.674V). It goes high-impedance once VOUT exceeds that threshold. A 100kΩ pullup resistor to OUT is required to generate a logic-high signal. During shutdown (SHDN = GND), POK is forcibly held low regardless of output voltage - enabling unambiguous system power-state detection.
Can the MAX1806EUA18 be used in adjustable-output mode?
No - the MAX1806EUA18 is factory-trimmed for fixed 1.8V output and must have the SET pin connected to GND to operate correctly. While the MAX1806 family supports adjustable mode via external resistors, the "EUA18" suffix denotes the 1.8V preset variant. Attempting to configure it as adjustable will result in incorrect regulation, as the internal feedback network is permanently configured for 1.8V. Use MAX1806EUA instead for adjustable versions.
What thermal design considerations apply to the MAX1806EUA18 in continuous 500mA operation?
At 500mA and 1.8V output with VIN = 3.3V, the MAX1806EUA18 dissipates ~750mW. Its 8-pin Power-µMAX package has an exposed thermal pad requiring direct solder connection to a minimum 100mm² copper pour or 4+ thermal vias to inner ground planes. Without this, junction temperature exceeds +150°C at +70°C ambient - triggering thermal shutdown. Derating curves in the datasheet confirm 500mA is sustainable only with proper PCB thermal design.
MAX1806EUA18 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 (1.8V)
- 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
MAX1806EUA18 FAQ
1.How can I place an order for MAX1806EUA18 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1806EUA18 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 MAX1806EUA18 reliable?
The price and inventory of MAX1806EUA18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1806EUA18 is usually 5 days.
3.What payment methods are accepted for MAX1806EUA18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1806EUA18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1806EUA18?
MAX1806EUA18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1806EUA18 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 MAX1806EUA18?
For technical support, including MAX1806EUA18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1806EUA18 requirements.
6.How does Aetrix verify that MAX1806EUA18 is sourced from the original manufacturer or authorized distributors?
All MAX1806EUA18 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 MAX1806EUA18 meets industry standards.
7.What is the process for return or replacement of MAX1806EUA18?
All MAX1806EUA18 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1806EUA18, 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 MAX1806EUA18 part is unused and in its original packaging.
Return procedure for MAX1806EUA18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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