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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 LIN 1.8V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,965
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Product details
Overview
MAX8888EZK18+T from Maxim Integrated is a low-dropout linear regulator delivering 1.8V at up to 300mA continuous output, featuring an open-drain power-OK (POK) flag, 100mV dropout at 200mA, 55µA no-load supply current, and thermal/short-circuit protection - deployed in portable battery-powered systems such as cellular phones and notebook computers.
For engineers reviewing the MAX8888EZK18+T datasheet, MAX8888EZK18+T pinout, MAX8888EZK18+T application, or MAX8888EZK18+T equivalent, key selection criteria include guaranteed POK functionality, fixed 1.8V output, SOT23-5 package compatibility, dropout performance under pulsed load, and shutdown leakage below 0.2µA.
Technical Context
The MAX8888EZK18+T integrates a p-channel MOSFET pass transistor with 0.5Ω RDS(ON), enabling ultra-low quiescent current independent of load and eliminating base-drive losses typical of PNP-based regulators. Its internal 1.25V reference and error amplifier drive the pass device to maintain regulation across input voltages from 2.5V to 5.5V.
POK operation is tightly referenced to the 1.8V output: it asserts low when VOUT falls below 92.5% of nominal (1.665V), with 1% hysteresis, and remains low during shutdown. The device uses foldback current limiting - reducing trip point from 420mA to 500mA (pulsed) only when VOUT drops below regulation threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% over 0°C to +85°C, enabling direct powering of 1.8V core logic without external feedback. |
| Max Continuous Output Current | 300mA guaranteed - sufficient for baseband processors or RF transceivers in handheld devices. |
| Dropout Voltage | 100mV at 200mA load - allows operation down to 1.9V input, extending usable battery life in single-cell Li-ion systems. |
| Quiescent Current | 55µA at no load - minimizes standby drain in always-on subsystems like real-time clocks or PMIC sequencers. |
| POK Threshold Accuracy | 92.5% of nominal output (1.665V) with ±2.5% tolerance - provides reliable power-fail detection for microcontroller reset sequencing. |
| Shutdown Current | 0.1µA typical - ensures sub-1µW system-level sleep power when SHDN is asserted. |
| Thermal Shutdown | Triggers at +170°C junction temperature with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
MAX8888EZK18+T is housed in a RoHS-compliant, lead-free 5-pin SOT23 package (1mm height), optimized for space-constrained portable designs. Pin assignments are validated per Maxim's official pin configuration diagram for MAX8888.
| 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 | Power ground reference | Common return path for input/output capacitors and internal circuitry; must be low-impedance. |
| 3 - SHDN | Active-low enable control | Pulled low to reduce supply current to <0.2µA; internally pulled up; tolerates 6V max voltage. |
| 4 - POK | Open-drain power-OK flag | Drives low when VOUT < 92.5% of 1.8V; requires external pullup (e.g., 100kΩ to OUT) for logic-level signaling. |
| 5 - OUT | Regulated 1.8V output | Sources up to 300mA; requires 2.2µF ceramic capacitor (ESR <0.2Ω) to GND for stability and noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated POK output | Enables reliable power-on-reset and system monitoring without external comparators or resistive dividers. |
| p-Channel MOSFET pass element | Eliminates base-drive current loss, maintaining 55µA quiescent current even at full 300mA load and in dropout. |
| Foldback current limiting | Reduces short-circuit current to ~500mA when output collapses, lowering power dissipation and thermal stress. |
| Thermal shutdown with hysteresis | Prevents latch-up during overload by cycling on/off with 20°C recovery margin, protecting PCB and adjacent components. |
| Low-noise compatible design | Supports optional BP pin (not used in MAX8888) for future upgrade paths or family migration to MAX8887 variants. |
Applications
| Cellular Phone Baseband Power | Notebook Computer I/O Rail |
|---|---|
Use Scenario: Powers 1.8V digital baseband processor core in GSM/UMTS handsets with dynamic load current ranging from 10µA to 300mA. IC Role / Device Role / Timing Role: Primary LDO supplying regulated 1.8V domain; POK signals MCU when rail enters undervoltage condition during battery sag. Use Value: 100mV dropout extends usable battery range by ~150mV, while 0.1µA shutdown current preserves charge during deep sleep modes. |
Use Scenario: Supplies 1.8V interface rail for USB 2.0 PHY or PCIe clock buffer in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary LDO generating clean, low-noise 1.8V from main 3.3V or 5V rail; POK enables BIOS-controlled power sequencing. Use Value: 60dB PSRR at 1kHz suppresses switching noise from DC-DC converters, preventing data corruption on high-speed serial links. |
| Digital Camera Image Sensor Bias | Wireless Handset RF Front-End |
Use Scenario: Provides stable 1.8V bias to CMOS image sensor analog front-end during burst capture with 100mA pulse loads. IC Role / Device Role / Timing Role: Low-noise auxiliary LDO; POK confirms rail readiness before sensor initialization sequence begins. Use Value: 55µA quiescent current minimizes idle drain on camera battery; 500mA pulsed capability handles sensor startup surges without dropout. |
Use Scenario: Powers 1.8V control logic and bias circuits for PA driver stages in LTE/Wi-Fi modules. IC Role / Device Role / Timing Role: Dedicated LDO for RF subsystem; POK synchronizes RF IC enable with stable supply, avoiding spurious emissions. Use Value: Thermal shutdown protects against RF-induced heating in compact antenna modules; SOT23-5 footprint eases layout near RF shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS78018DDCR | 1.8V fixed, 150mA max, 0.45µA IQ, no POK output | Lacks power-OK flag; insufficient for systems requiring reset signaling or rail monitoring | Select only if POK is unused and load current ≤150mA. |
| MCP1826-1802E/DB | 1.8V fixed, 300mA, 120µA IQ, active-high PGOOD, different pinout (SOT-23-5 but non-compatible) | PGOOD is push-pull (not open-drain); requires board redesign due to SHDN/PGOOD pin swap vs. MAX8888 | Use only with new layout; not drop-in despite same package outline. |
Compared with TPS78018DDCR and MCP1826-1802E/DB, the MAX8888EZK18+T uniquely combines 300mA capability, open-drain POK, 55µA IQ, and validated SOT23-5 pinout - making it the only option supporting both high-current 1.8V rails and hardware reset sequencing in legacy portable designs.
Availability
MAX8888EZK18+T is available at Aetrix Electronics and suitable for cellular phones, notebook computers, digital cameras, and wireless handsets requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.
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, communications, and consumer applications.
The MAX8887/MAX8888 product line delivers ultra-low-quiescent-current LDOs with integrated POK for battery-powered portable electronics - prioritizing extended runtime, small footprint, and robust fault protection.
FAQ
What is the output voltage tolerance of the MAX8888EZK18+T over temperature and load?
The MAX8888EZK18+T guarantees ±2% output voltage accuracy over load current (100µA to 300mA) and temperature (-40°C to +85°C), and ±3% over the full operating range including input voltage variation. This ensures reliable 1.8V operation for 1.8V-tolerant logic without external trimming or calibration - critical for consistent timing and signal integrity in portable systems where the MAX8888EZK18+T is deployed.
Does the MAX8888EZK18+T require an external capacitor on the BP pin?
No - the BP (bypass) pin is present on the MAX8888EZK18+T die but is not connected internally; it is reserved for the MAX8887 variant which uses it for noise reduction. For the MAX8888EZK18+T, the BP pin must be left unconnected or tied to GND. Using a capacitor on BP provides no benefit and may compromise stability, as confirmed in Maxim's application notes for the MAX8888EZK18+T.
Can the POK output of the MAX8888EZK18+T drive a standard CMOS input directly?
No - the POK output is open-drain and requires an external pullup resistor to establish a valid logic-high level. A 100kΩ resistor from POK to OUT is recommended per Maxim's datasheet for the MAX8888EZK18+T, producing ~1.8V high-level compatible with 1.8V CMOS inputs. Driving POK directly into a CMOS gate without pullup results in undefined logic states and potential system boot failures.
What is the maximum allowable input voltage for the MAX8888EZK18+T?
The absolute maximum input voltage for the MAX8888EZK18+T is +7V applied to the IN pin relative to GND, but the functional operating range is strictly 2.5V to 5.5V. Exceeding 5.5V risks violating the specified electrical characteristics and may trigger undervoltage lockout or cause premature thermal shutdown. For automotive or industrial applications with higher transients, external protection circuitry is required before the MAX8888EZK18+T input.
How does the MAX8888EZK18+T behave during thermal shutdown?
When the junction temperature exceeds +170°C, the MAX8888EZK18+T disables the pass transistor and forces POK and OUT low. After cooling by 20°C (to ~150°C), it automatically resumes regulation - resulting in pulsed output during sustained overload. This behavior protects the MAX8888EZK18+T from permanent damage but requires thermal design margins to avoid repeated cycling, especially in sealed enclosures where the MAX8888EZK18+T operates near its 727mW power limit.
MAX8888EZK18+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- 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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