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Analog Devices Inc./Maxim Integrated MAX8888EZK18-T
- Part No.:
- MAX8888EZK18-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8888EZK18-T.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
MAX8888EZK18-T from Maxim Integrated is a low-dropout linear regulator delivering 1.8V fixed output at up to 300mA continuous current, featuring an open-drain power-OK (POK) flag, 100mV dropout at 200mA, 55µA no-load supply current, and thermal/short-circuit protection. It operates from 2.5V–5.5V input and targets battery-powered portable electronics requiring precise, stable low-voltage rails.
For engineers reviewing the MAX8888EZK18-T datasheet, MAX8888EZK18-T pinout, MAX8888EZK18-T application, or MAX8888EZK18-T equivalent, key selection criteria include POK functionality for system power sequencing, low-quiescent-current operation in shutdown (0.1µA), SOT23-5 package compatibility, and guaranteed 1.8V ±3% accuracy across load and temperature.
Technical Context
The MAX8888EZK18-T integrates a p-channel MOSFET pass transistor with 0.5Ω RDS(ON), enabling low dropout and eliminating base-drive current loss typical of PNP-based regulators. Its internal 1.25V reference and error amplifier maintain regulation while supporting foldback current limiting and thermal shutdown at 170°C.
Unlike the noise-optimized MAX8887 variant, the MAX8888EZK18-T substitutes BP (bypass) pin functionality for POK - an open-drain active-low flag asserting when VOUT falls below 92.5% of nominal (1.665V). POK requires external pullup (e.g., 100kΩ to OUT) and remains low during shutdown.
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 - sufficient for core logic rails in handheld devices without derating |
| Dropout Voltage | 100mV at 200mA - enables operation down to VIN = 1.9V while maintaining 1.8V regulation |
| Quiescent Supply Current | 55µA at no load - minimizes battery drain in always-on subsystems |
| Shutdown Current | 0.1µA - supports ultra-low-power sleep modes in portable systems |
| POK Threshold Accuracy | 92.5% of nominal (1.665V) with 1% hysteresis - ensures reliable power-good assertion before microcontroller wake-up |
| Thermal Shutdown | 170°C with 20°C hysteresis - provides self-recovery under sustained overload without latch-up |
Pinout & Package
MAX8888EZK18-T is housed in a thin 5-pin SOT23 package (1mm height, Z5-1 footprint), RoHS-compliant and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 2.5V–5.5V; requires 2.2µF ceramic bypass to GND for stability and transient response |
| 2 - GND | Ground reference | Common return path for input, output, and internal circuitry; must be low-impedance |
| 3 - SHDN | Active-low enable control | Pulled low to enter 0.1µA shutdown; driven high (≥1.6V) for normal operation; tolerates up to 6V |
| 4 - POK | Open-drain power-OK flag | Asserts low when VOUT < 1.665V; requires external pullup (e.g., 100kΩ to OUT); held low in shutdown |
| 5 - OUT | Regulated output | Delivers 1.8V ±3% at up to 300mA; bypassed with 2.2µF ceramic capacitor (ESR < 0.1Ω) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated POK output | Enables hardware-based power-on reset and system-level fault detection without external comparators |
| p-Channel MOSFET pass device | Eliminates base-drive current loss, sustaining 55µA quiescent current even at full 300mA load and in dropout |
| Foldback current limiting | Reduces short-circuit current to ~500mA when VOUT drops below 93%, lowering thermal stress during faults |
| Thermal shutdown with hysteresis | Self-recovering protection at 170°C (±20°C hysteresis) prevents latch-up and supports intermittent overload tolerance |
| Low-noise compatible layout | Supports clean 1.8V rail for RF/analog sections when paired with recommended 2.2µF COUT and proper PCB decoupling |
Applications
| Wireless Handsets | Notebook Computer Subsystem Rails |
|---|---|
|
Use Scenario: Powering baseband processor I/O or memory interface in GSM/UMTS handsets with Li-ion battery input (3.0V–4.2V). IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying digital core logic with tight voltage tolerance and fast load-transient response. Use Value: 100mV dropout extends usable battery life by enabling regulation until cell voltage drops to 1.9V, while POK synchronizes processor boot sequence. |
Use Scenario: Generating 1.8V supply for PCIe controller or USB PHY in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary regulated rail isolated from main DC-DC converter, providing low-noise, low-ripple voltage for high-speed interfaces. Use Value: 55µA quiescent current minimizes standby power draw; thermal shutdown protects against localized hotspots on dense motherboard layouts. |
| Digital Cameras | Hand-Held Instruments |
|
Use Scenario: Supplying image sensor interface or ISP core voltage in compact digital cameras powered by dual AA/AAA cells. IC Role / Device Role / Timing Role: Fixed-output LDO delivering stable 1.8V to timing-critical imaging blocks during burst capture and video streaming. Use Value: Guaranteed 300mA output supports peak sensor current demands; POK confirms rail readiness before frame acquisition begins. |
Use Scenario: Powering microcontroller peripherals (ADC, LCD driver, serial interface) in battery-operated multimeters or data loggers. IC Role / Device Role / Timing Role: Low-quiescent LDO ensuring long shelf life and accurate analog measurements via stable 1.8V reference rail. Use Value: 0.1µA shutdown current preserves battery charge for years in storage; ±3% output accuracy maintains measurement integrity across temperature. |
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-G | 1.8V fixed, 300mA, no POK output; 150mV dropout at 200mA; 1.0µA shutdown current | Lacks power-OK signaling - requires external monitoring for POR or fault detection | Select when POK is unnecessary and lowest possible shutdown current is prioritized over regulation margin |
| Diodes Inc. AP2112K-1.8TRG1 | 1.8V fixed, 600mA, no POK; 250mV dropout at 300mA; 60µA quiescent current; includes reverse-current protection | Higher current capability but larger dropout reduces usable battery range; no integrated POK | Choose for higher load headroom where input voltage margin exceeds 2.05V and POK is handled externally |
Compared with MAX8888EZK18-T, the XC6206P182MR-G offers lower shutdown current but forfeits system-level power sequencing; the AP2112K-1.8TRG1 delivers more current but sacrifices dropout performance and POK integration - making MAX8888EZK18-T optimal for space-constrained, battery-sensitive designs requiring autonomous power-good signaling.
Availability
MAX8888EZK18-T is available at Aetrix Electronics and suitable for wireless handsets, notebook computer subsystems, digital cameras, and hand-held instruments requiring stable component supply, guaranteed 1.8V regulation, and integrated power-OK functionality.
Supply support for MAX8888EZK18-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, automotive, and portable applications.
The MAX8887/MAX8888 product line delivers ultra-low-quiescent, low-dropout regulators optimized for Li-ion–powered portable electronics where battery life, small size, and system-level power supervision are critical.
FAQ
What is the output voltage tolerance of the MAX8888EZK18-T over temperature and load?
The MAX8888EZK18-T guarantees ±3% output voltage accuracy across the full operating temperature range (−40°C to +85°C) and load current range (100µA to 300mA). This specification is validated per the Electrical Characteristics table in the official datasheet, with typical deviation remaining within ±0.05% at room temperature and light loads. The 1.8V nominal output thus stays between 1.746V and 1.854V under all specified conditions, ensuring compatibility with 1.8V logic families.
Does the MAX8888EZK18-T require an external bypass capacitor on the BP pin?
No - the MAX8888EZK18-T does not include a BP (bypass) pin. Unlike the MAX8887 variant, the MAX8888EZK18-T replaces the BP pin with POK (pin 4). Therefore, no BP capacitor is used or required. Instead, a 100kΩ pullup resistor from POK to OUT is recommended to generate a logic-level power-OK signal, and 2.2µF ceramic capacitors are required on both IN and OUT pins for stability and transient performance.
What is the minimum input voltage required for the MAX8888EZK18-T to maintain regulation at 300mA load?
At 300mA load, the MAX8888EZK18-T exhibits a maximum dropout voltage of 150mV (per Electrical Characteristics table, VOUT = +3.3V case; extrapolated to 1.8V using typical RDS(ON)). For 1.8V output, minimum input is therefore 1.8V + 0.15V = 1.95V. However, the absolute minimum input voltage for guaranteed operation is 2.5V per Absolute Maximum Ratings - meaning the device is not specified to regulate below VIN = 2.5V, even if dropout allows it. Always maintain VIN ≥ 2.5V.
How does the POK output behave during shutdown of the MAX8888EZK18-T?
During shutdown (SHDN = GND), the MAX8888EZK18-T drives both OUT and POK low. The POK pin becomes actively pulled low regardless of output voltage level - it does not float or go high-impedance. This behavior ensures unambiguous power-fail signaling to downstream logic during sleep mode. Once SHDN is returned high, POK transitions to high-impedance only after VOUT rises above 92.5% of 1.8V (i.e., >1.665V) and remains there for the internal hysteresis window.
Can the MAX8888EZK18-T be used with ceramic output capacitors having ESR higher than 0.1Ω?
No - the MAX8888EZK18-T requires an output capacitor with ESR ≤ 0.1Ω to ensure stability and optimal transient response, as explicitly stated in the Applications Information section. Ceramic capacitors meeting this ESR requirement (e.g., X5R/X7R 2.2µF in 0603 or 0805 packages) are recommended. Higher-ESR capacitors (e.g., tantalum or aluminum electrolytic) risk oscillation, overshoot, or poor load-step recovery and are not supported by the design.
MAX8888EZK18-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 65 µA
- PSRR:
- 40dB (1kHz)
- 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:
- TSOT-23-5
MAX8888EZK18-T FAQ
1.How can I place an order for MAX8888EZK18-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8888EZK18-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 MAX8888EZK18-T reliable?
The price and inventory of MAX8888EZK18-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8888EZK18-T is usually 5 days.
3.What payment methods are accepted for MAX8888EZK18-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8888EZK18-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8888EZK18-T?
MAX8888EZK18-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8888EZK18-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 MAX8888EZK18-T?
For technical support, including MAX8888EZK18-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8888EZK18-T requirements.
6.How does Aetrix verify that MAX8888EZK18-T is sourced from the original manufacturer or authorized distributors?
All MAX8888EZK18-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 MAX8888EZK18-T meets industry standards.
7.What is the process for return or replacement of MAX8888EZK18-T?
All MAX8888EZK18-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8888EZK18-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 MAX8888EZK18-T part is unused and in its original packaging.
Return procedure for MAX8888EZK18-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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