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Analog Devices Inc./Maxim Integrated MAX8888EUK18
- Part No.:
- MAX8888EUK18
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX8888EUK18.pdf
- Description:
- LOW-DROPOUT, 300MILLIAMP LINEAR
- Quantity:
- Payment:
- Shipping:
Inventory:435
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Product details
Overview
MAX8888EUK18 from Maxim Integrated is a fixed-output 1.8V, 300mA low-dropout linear regulator with open-drain POK flag, designed for battery-powered portable systems. It operates from 2.5V to 5.5V input, delivers ≤100mV dropout at 200mA, maintains 55µA no-load quiescent current, and features thermal shutdown, short-circuit protection, and foldback current limiting - used in cellular handsets and notebook computers.
For engineers reviewing the MAX8888EUK18 datasheet, MAX8888EUK18 pinout, MAX8888EUK18 application, or MAX8888EUK18 equivalent, key selection criteria include guaranteed 300mA output under dropout conditions, 90–95% POK trip threshold referenced to VOUT, 0.1µA shutdown current, and compatibility with 2.2µF ceramic input/output capacitors for stable operation in space-constrained SOT23-5 layouts.
Technical Context
The MAX8888EUK18 employs an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.5Ω) enabling load-independent 55µA ground-pin current and eliminating base-drive losses typical of PNP-based LDOs. Its error amplifier compares feedback against a 1.25V reference, with factory-trimmed resistive divider setting nominal 1.8V output.
POK functionality is implemented via an open-drain N-channel output that asserts low when VOUT falls below 92.5% of nominal (typical 93%), with 1% hysteresis; it remains low during shutdown and requires external pullup (e.g., 100kΩ to VOUT) for logic-level interfacing with microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% over load (100µA–300mA) and temperature (−40°C to +85°C) |
| Max Continuous Output Current | 300mA guaranteed - supports core logic rails in handheld devices without thermal derating at TA ≤ +70°C |
| Dropout Voltage | 100mV at 200mA - enables regulation down to VIN = 1.9V, extending usable battery life in Li-ion and Li-poly systems |
| Quiescent Current | 55µA at no load - minimizes standby power loss in always-on subsystems like RTC or sensor interfaces |
| Shutdown Current | 0.1µA max - ensures negligible battery drain during deep sleep modes in portable electronics |
| POK Trip Threshold | 92.5% of VOUT (90–95% min/max) - provides reliable power-on reset signaling before system initialization |
| PSRR @ 1kHz | 40dB - suppresses switching noise from adjacent DC/DC converters feeding shared input rails |
Pinout & Package
MAX8888EUK18 is housed in a thin-profile 5-pin SOT23 package (1mm height), optimized for high-density portable PCB layouts. Pin assignments are validated per Maxim's official pin configuration diagram for MAX8888.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts 2.5V–5.5V; requires 2.2µF ceramic bypass to GND for stability and transient response |
| 2 - GND | Power ground reference | Low-impedance return path for regulator and POK; must be connected directly to system ground plane |
| 3 - SHDN | Active-low enable control | Pulled low to enter 0.1µA shutdown; driven high (≥1.6V) or tied to IN for normal operation |
| 4 - POK | Open-drain power-good flag | Sinks current when VOUT < 92.5% of 1.8V; requires external pullup for µC reset assertion |
| 5 - OUT | Regulated output | Delivers up to 300mA at 1.8V; bypassed with 2.2µF ceramic capacitor (ESR < 0.1Ω) to GND |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain POK output | Enables direct interface with 1.8V/3.3V microcontrollers using simple pullup; eliminates need for level-shifting circuitry |
| 55µA ground-pin current | Remains constant across full load range - simplifies battery life estimation and avoids dynamic current spikes |
| Foldback current limiting | Reduces current limit to 500mA (pulsed) when VOUT drops below 93%, protecting downstream circuits during fault conditions |
| Thermal shutdown with 20°C hysteresis | Prevents permanent damage during sustained overload; auto-recovers after cooling, supporting fault-tolerant designs |
| 0.1µA shutdown current | Allows multi-week battery shelf life in shipped devices - critical for consumer electronics with long distribution cycles |
Applications
| Cellular Handsets | Notebook Computers |
|---|---|
Use Scenario: Powering baseband processor I/O banks and RF transceiver bias rails in dual-mode GSM/UMTS handsets. IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying noise-sensitive analog sections with POK confirmation before RF startup. Use Value: 100mV dropout extends talk time by >12 minutes on single-cell Li-ion; POK ensures clean POR sequencing with BB processor. |
Use Scenario: Supplying DDR memory termination voltage (VTT) and chipset auxiliary rails in ultra-thin notebooks. IC Role / Device Role / Timing Role: Secondary LDO delivering stable 1.8V with fast load-transient response (<10µs recovery) during memory burst access. Use Value: 55µA quiescent current reduces standby power by 85% vs. legacy LDOs; SOT23-5 footprint saves >1.2mm² board area. |
| PDAs and Palmtop Computers | Digital Cameras |
Use Scenario: Regulating image signal processor (ISP) core voltage and touch-screen controller logic in palm-sized PDAs. IC Role / Device Role / Timing Role: Low-noise 1.8V source with POK used to gate clock enable to ISP upon valid rail establishment. Use Value: 40dB PSRR at 1kHz rejects noise from display backlight inverters; 0.1µA shutdown preserves battery during suspend-to-RAM. |
Use Scenario: Powering CMOS image sensor analog front-end and autofocus motor driver ICs in compact digital cameras. IC Role / Device Role / Timing Role: Dedicated 1.8V LDO with thermal protection preventing overheating during continuous video capture. Use Value: Foldback current limiting prevents thermal runaway when AF motor stalls; 1mm-height SOT23 fits stacked camera module assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P182MR | 1.8V fixed, 300mA, no POK output; 150mV dropout at 200mA; 12µA IQ | Lacks power-good signaling - requires external monitoring circuit for POR | Select when POK is unnecessary and ultra-low IQ dominates design priority |
| Analog Devices ADP160ACBZ-1.8-R7 | 1.8V fixed, 150mA max; 195mV dropout at 150mA; includes POK but rated only to 150mA | Lower current capability limits use to low-power peripherals, not core logic rails | Select for space-constrained sub-150mA loads where ADI supply chain preference applies |
Compared with MAX8888EUK18, XC6206P182MR offers lower quiescent current but forfeits POK and has higher dropout, while ADP160ACBZ-1.8-R7 provides POK in a smaller package but cannot sustain 300mA - making MAX8888EUK18 the only option meeting all three requirements: 300mA, 100mV dropout, and integrated POK in SOT23-5.
Availability
MAX8888EUK18 is available at Aetrix Electronics and suitable for cellular handsets, notebook computers, and digital cameras requiring stable component supply with guaranteed long-term manufacturability and lead-free compliance.
Supply support for MAX8888EUK18 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 MAX8887/MAX8888 product line was engineered specifically for portable battery-powered equipment - emphasizing ultra-low quiescent current, minimal dropout, and integrated power-monitoring features in miniature packages.
FAQ
What is the output voltage tolerance of the MAX8888EUK18 over temperature and load?
The MAX8888EUK18 guarantees ±3% output voltage accuracy across the full operating temperature range (−40°C to +85°C) and load current (100µA to 300mA). This specification is confirmed in the Electrical Characteristics table of the official datasheet, where output voltage deviation is bounded between −3% and +3% under those conditions - ensuring reliable operation for 1.8V logic interfaces without external trimming.
Does the MAX8888EUK18 require an external BP capacitor like the MAX8887?
No, the MAX8888EUK18 does not require or support a BP (bypass) capacitor. Unlike the MAX8887, which uses BP for noise filtering, the MAX8888 omits the BP pin entirely - its pin 4 is POK, not BP. The MAX8888EUK18 achieves acceptable noise performance without BP, and adding a capacitor to the POK pin would impair its open-drain functionality. Always refer to the MAX8888-specific pinout diagram.
What is the minimum pullup resistance required for the POK pin on the MAX8888EUK18?
The MAX8888EUK18 POK pin specifies a maximum VOL of 0.1V at 1mA sink current. To ensure reliable logic-high assertion when active, a 100kΩ pullup resistor to VOUT is recommended per Maxim's application guidance. Lower values (e.g., 10kΩ) increase current draw unnecessarily; higher values (>1MΩ) risk slow rise times and noise susceptibility - especially in noisy environments near switching regulators.
Can the MAX8888EUK18 operate with input voltages below 2.5V?
No, the MAX8888EUK18 has a specified absolute minimum input voltage of 2.5V and includes undervoltage lockout (UVLO) that disables regulation if VIN falls below approximately 2.4V (rising threshold). Operation below 2.5V violates Absolute Maximum Ratings and risks unregulated output or undefined behavior - it is not supported for any duration, even transiently.
How does thermal shutdown behave on the MAX8888EUK18 during continuous overload?
When junction temperature exceeds +170°C, the MAX8888EUK18 activates thermal shutdown, turning off the pass transistor. After cooling by 20°C (to ~150°C), it automatically resumes regulation - resulting in pulsed output during sustained overload. This hysteresis prevents oscillation and allows safe fault detection. For continuous operation, keep θJA low via PCB copper pour and avoid exceeding 727mW power dissipation at +70°C ambient.
MAX8888EUK18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX8888EUK18 FAQ
1.How can I place an order for MAX8888EUK18 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8888EUK18 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 MAX8888EUK18 reliable?
The price and inventory of MAX8888EUK18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8888EUK18 is usually 5 days.
3.What payment methods are accepted for MAX8888EUK18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8888EUK18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8888EUK18?
MAX8888EUK18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8888EUK18 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 MAX8888EUK18?
For technical support, including MAX8888EUK18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8888EUK18 requirements.
6.How does Aetrix verify that MAX8888EUK18 is sourced from the original manufacturer or authorized distributors?
All MAX8888EUK18 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 MAX8888EUK18 meets industry standards.
7.What is the process for return or replacement of MAX8888EUK18?
All MAX8888EUK18 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8888EUK18, 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 MAX8888EUK18 part is unused and in its original packaging.
Return procedure for MAX8888EUK18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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