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Analog Devices Inc./Maxim Integrated MAX8888EZK25+
- Part No.:
- MAX8888EZK25+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8888EZK25+.pdf
- Description:
- IC REG LINEAR LDO 300MA
- Quantity:
- Payment:
- Shipping:
Inventory:1,908
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Product details
Overview
MAX8888EZK25+ from Maxim Integrated is a low-dropout linear regulator delivering up to 300mA continuous output current with 100mV dropout at 200mA, 2.5V nominal output voltage, and an open-drain power-OK (POK) flag - designed for battery-powered portable systems including wireless handsets and PDAs.
For engineers reviewing the MAX8888EZK25+ datasheet, MAX8888EZK25+ pinout, MAX8888EZK25+ application, or MAX8888EZK25+ equivalent, key selection criteria include guaranteed 2.5V fixed output, POK functionality for system reset sequencing, thermal/short-circuit protection, and SOT23-5 package compatibility in space-constrained designs.
Technical Context
The MAX8888EZK25+ uses an internal p-channel MOSFET pass transistor with 0.5Ω RDS(ON), enabling ultra-low quiescent current (55µA no-load) independent of load - critical for battery runtime extension. Its POK output asserts low when VOUT falls below 92.5% of nominal (2.313V), with 1% hysteresis and open-drain n-channel structure requiring external pullup.
It operates across 2.5V–5.5V input range and maintains ±2% output voltage accuracy over –40°C to +85°C and 100µA–300mA load. Foldback current limiting reduces trip threshold to 500mA when VOUT drops below regulation, enhancing fault resilience during brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% - eliminates external feedback resistors and ensures stable core logic supply for 2.5V I/O domains. |
| Max Continuous Output Current | 300mA - sufficient to power baseband processors, RF transceivers, or sensor subsystems without thermal derating at ambient ≤70°C. |
| Dropout Voltage | 100mV at 200mA - enables operation down to 2.6V input, extending usable life of single-cell Li-ion (2.7–4.2V) and NiMH batteries. |
| Quiescent Current | 55µA at no load - minimizes standby power loss in always-on subsystems such as real-time clocks or wake-up controllers. |
| POK Threshold Accuracy | 92.5% of VOUT (±2.5%) - provides precise undervoltage detection for microcontroller reset assertion with minimal external components. |
| Shutdown Current | 0.1µA - reduces system leakage to sub-nA levels when paired with high-impedance SHDN control lines. |
| Thermal Shutdown | 170°C with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking while allowing self-recovery. |
Pinout & Package
MAX8888EZK25+ is housed in a RoHS-compliant, thin-profile 5-pin SOT23 package (1mm height), optimized for high-density portable PCB layouts and reflow-compatible assembly.
| 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 current and POK sink; must be connected directly to system ground plane. |
| 3 - SHDN | Active-low enable control | Logic low (<0.6V) disables regulator and forces OUT/POK low; tolerates up to 6V regardless of VIN/VOUT. |
| 4 - POK | Open-drain power-OK flag | Drives low when VOUT < 92.5% of 2.5V; requires external pullup (e.g., 100kΩ to OUT) for logic-level reset signaling. |
| 5 - OUT | Regulated output | Delivers 2.5V ±2% at up to 300mA; requires ≥2.2µF ceramic capacitor (ESR < 0.1Ω) to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.5V output | Eliminates external resistor network, reducing BOM count and layout area while guaranteeing tight DC accuracy across temperature and load. |
| Integrated POK output | Provides system-level power monitoring without external comparators or voltage dividers - simplifies POR implementation for µC-based devices. |
| p-Channel MOSFET pass element | Enables constant 55µA ground current regardless of load or dropout condition - unlike bipolar-based LDOs that increase quiescent current under heavy load. |
| Foldback current limiting | Reduces short-circuit current to 500mA when output collapses, lowering power dissipation and preventing thermal runaway during sustained faults. |
| Thermal shutdown with hysteresis | Auto-recovers after junction cools by 20°C, enabling graceful degradation instead of hard latch-off - improves field reliability in thermally marginal designs. |
Applications
| Wireless Handsets | Notebook Computers |
|---|---|
|
Use Scenario: Powering RF front-end ICs and baseband processors during active call mode with dynamic load steps. IC Role / Device Role / Timing Role: Primary 2.5V supply regulator with fast load-transient response and POK-synchronized reset signaling. Use Value: Maintains 2.5V rail stability within ±2% during 10mA–300mA load transients (10µs rise/fall), preventing RF desense and digital lockup. |
Use Scenario: Supplying USB controller, card reader, or touchpad interface logic in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary LDO for isolated 2.5V I/O domain with independent shutdown control and brownout detection. Use Value: Enables selective subsystem power gating via SHDN while POK ensures clean reset before host processor initialization. |
| PDAs and Palmtop Computers | Digital Cameras |
|
Use Scenario: Regulating power to LCD driver and flash memory interface in handheld computing devices. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current source for mixed-signal peripherals requiring stable 2.5V bias. Use Value: Delivers 55µA no-load current and 100mV dropout - extends battery life beyond 12 hours in standby while supporting burst-mode imaging. |
Use Scenario: Powering image signal processor (ISP) core logic and auto-focus motor drivers in compact camera modules. IC Role / Device Role / Timing Role: Compact-area LDO with thermal protection for thermally constrained optical assemblies. Use Value: Withstands 170°C junction shutdown and recovers autonomously - prevents permanent failure during extended video capture in enclosed housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76325DBVR | 2.5V fixed output, 150mV dropout at 150mA, no POK output, 85µA IQ | Lacks power-OK flag; requires external monitoring circuitry for reset generation | Select when POK is unnecessary and higher dropout tolerance is acceptable for cost-sensitive designs. |
| MCP1702T-2502E/MB | 2.5V fixed output, 600mV dropout at 250mA, no POK, 4µA IQ (ultra-low), SOT23-5 | Higher dropout limits usable input range; lacks fault-flag capability for system supervision | Prefer for ultra-low-power always-on sensors where POK is not required and input voltage remains >3.1V. |
Compared with TPS76325DBVR and MCP1702T-2502E/MB, the MAX8888EZK25+ uniquely combines 100mV dropout, integrated POK, and 55µA quiescent current in SOT23-5 - making it optimal for battery-powered systems needing both efficiency and supervisory functionality without added components.
Availability
MAX8888EZK25+ is available at Aetrix Electronics and suitable for wireless handsets, notebook computers, and PDAs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8888EZK25+ 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 MAX8888EZK25+ belongs to Maxim's precision low-dropout regulator product line, engineered specifically for portable battery-operated equipment demanding high accuracy, low quiescent current, and integrated power supervision.
FAQ
What is the exact output voltage tolerance of the MAX8888EZK25+ over temperature and load?
The MAX8888EZK25+ guarantees ±2% output voltage accuracy across –40°C to +85°C ambient temperature and 100µA to 300mA load current, as specified in the Electrical Characteristics table under "Output Voltage Accuracy" with VIN = VOUT + 1V. This tolerance holds for the full operating range without requiring external trimming or calibration - ensuring reliable 2.5V supply for logic interfaces and ADC references.
Does the MAX8888EZK25+ require an external bypass capacitor on the BP pin?
No - the BP (bypass) pin is specific to the MAX8887 variant for noise reduction and is not present on the MAX8888EZK25+. The MAX8888EZK25+ does not include a BP pin; its pinout is IN-GND-SHDN-POK-OUT. Therefore, no BP capacitor is needed or supported for the MAX8888EZK25+.
Can the POK output of the MAX8888EZK25+ drive a microcontroller reset pin directly?
Yes - the POK output of the MAX8888EZK25+ is an open-drain n-channel output that can sink ≥1mA at 0.1V. When pulled up to the microcontroller's VDD (e.g., 2.5V or 3.3V) via a 100kΩ resistor, it delivers a valid logic-high reset release signal and logic-low assertion when VOUT drops below 92.5% of 2.5V. No level-shifting or buffering is required for standard CMOS reset inputs.
What is the maximum allowable input voltage for the MAX8888EZK25+?
The absolute maximum input voltage for the MAX8888EZK25+ is +7V referenced to GND, but the recommended operating range is strictly 2.5V to 5.5V per the Electrical Characteristics table. Exceeding 5.5V risks violating functional specifications and may trigger internal protection circuits - sustained operation above 5.5V is not guaranteed and voids parametric performance.
How does the MAX8888EZK25+ behave during thermal shutdown?
When the MAX8888EZK25+ junction temperature exceeds +170°C, thermal shutdown disables the pass transistor, dropping output current to near zero. After the die cools by 20°C (to ~150°C), the device automatically resumes regulation - resulting in pulsed output during continuous overload. This behavior protects the MAX8888EZK25+ from permanent damage while maintaining visibility of fault conditions through POK and output collapse.
MAX8888EZK25+ 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):
- 2.5V
- 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
MAX8888EZK25+ FAQ
1.How can I place an order for MAX8888EZK25+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8888EZK25+ 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 MAX8888EZK25+ reliable?
The price and inventory of MAX8888EZK25+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8888EZK25+ is usually 5 days.
3.What payment methods are accepted for MAX8888EZK25+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8888EZK25+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8888EZK25+?
MAX8888EZK25+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8888EZK25+ 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 MAX8888EZK25+?
For technical support, including MAX8888EZK25+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8888EZK25+ requirements.
6.How does Aetrix verify that MAX8888EZK25+ is sourced from the original manufacturer or authorized distributors?
All MAX8888EZK25+ 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 MAX8888EZK25+ meets industry standards.
7.What is the process for return or replacement of MAX8888EZK25+?
All MAX8888EZK25+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8888EZK25+, 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 MAX8888EZK25+ part is unused and in its original packaging.
Return procedure for MAX8888EZK25+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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