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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
- Quantity:
- Payment:
- Shipping:
Inventory:1,015
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Product details
Overview
MAX8888EZK25 from Maxim Integrated is a low-dropout linear regulator delivering 2.5V fixed output at up to 300mA continuous current, featuring an open-drain 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 power management in space-constrained portable electronics.
For engineers reviewing the MAX8888EZK25 datasheet, MAX8888EZK25 pinout, MAX8888EZK25 application, or MAX8888EZK25 equivalent, key selection criteria include guaranteed 300mA load capability, POK monitoring for system reset sequencing, SOT23-5 footprint compatibility, and 2.5V output accuracy over temperature and line variation.
Technical Context
The MAX8888EZK25 uses an internal P-channel MOSFET pass transistor with ~0.5Ω RDS(ON), enabling low dropout and load-independent 55µA quiescent current. Its error amplifier compares feedback from a factory-trimmed resistive divider against a 1.25V reference to regulate output.
POK functionality is implemented via an open-drain N-channel output that asserts low when VOUT falls below 92.5% of nominal (2.313V), with 1% hysteresis; it remains low during shutdown and requires external pullup for logic-level interfacing with microcontrollers or PMICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±3% over -40°C to +85°C, enabling direct replacement of 2.5V logic rails without external feedback. |
| Max Continuous Output Current | 300mA - sufficient to power baseband processors, RF transceivers, or sensor subsystems in handheld devices. |
| Dropout Voltage | 100mV at 200mA - allows operation down to VIN = 2.6V, extending usable battery life in single-cell Li-ion or Li-poly systems. |
| Supply Current (No Load) | 55µA - minimizes standby power loss in always-on circuits such as real-time clocks or wake-up controllers. |
| POK Threshold Accuracy | 92.5% of nominal (2.313V) ±2.5% - ensures reliable power-good assertion before microcontroller initialization sequences begin. |
| PSRR @ 1kHz | 40dB - suppresses switching noise from adjacent DC-DC converters, preserving analog signal integrity in mixed-signal SoCs. |
| Shutdown Current | 0.1µA - enables deep sleep modes in battery-backed systems with multi-year shelf life requirements. |
Pinout & Package
MAX8888EZK25 is housed in a thin 5-pin SOT23 package (1mm height), optimized for high-density portable PCB layouts. The pinout is fully validated per Maxim's official pin configuration diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 2.5V–5.5V; requires 2.2µF ceramic bypass capacitor to GND for stability and transient response. |
| 2 - GND | Ground reference | Common return path for input, output, and internal circuitry; must be low-impedance connection to minimize noise coupling. |
| 3 - SHDN | Active-low shutdown control | Pulled low to reduce supply current to 0.1µA; driven high (≥1.6V) for normal operation; tolerates up to 6V regardless of VIN/VOUT. |
| 4 - POK | Open-drain power-ok indicator | Asserts low when VOUT < 92.5% of 2.5V; requires external pullup (e.g., 100kΩ to OUT) for logic-compatible reset signaling. |
| 5 - OUT | Regulated 2.5V output | Sources up to 300mA; bypassed with 2.2µF ceramic capacitor (ESR < 0.1Ω) to ensure stability and low-noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.5V output | Eliminates external resistor network, reducing BOM count and layout area while guaranteeing ±3% accuracy across temperature. |
| Integrated POK flag | Provides deterministic power-good status for µC reset sequencing without requiring external supervisor ICs or discrete comparators. |
| Thermal shutdown with hysteresis | Shuts down at +170°C junction temperature and re-enables after 20°C cooldown, preventing latch-up during sustained overload conditions. |
| Foldback current limiting | Reduces current limit from 500mA to 420mA when VOUT drops below 93%, protecting downstream loads during brownout events. |
| SOT23-5 footprint | Enables drop-in replacement in existing designs using industry-standard 5-pin SOT packages; compatible with standard reflow profiles. |
Applications
| Wireless Handsets | Digital Cameras |
|---|---|
|
Use Scenario: Powering baseband processor I/O banks and RF front-end bias circuits in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Primary LDO supplying stable 2.5V rail with fast transient response to handle burst-mode transmission current spikes. Use Value: 100mV dropout extends talk time by enabling regulation until battery voltage drops to 2.6V, while POK ensures clean boot sequencing. |
Use Scenario: Supplying image sensor interface and flash controller logic in compact digital still cameras. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current regulator for precision analog front-end and timing-critical memory interfaces. Use Value: 55µA no-load current preserves battery charge during standby; 40dB PSRR at 1kHz prevents switching noise from DC-DC converters corrupting image data. |
| Notebook Computers | Hand-Held Instruments |
|
Use Scenario: Providing auxiliary 2.5V supply for USB PHY, card reader controllers, or embedded security modules in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary LDO supporting isolated subsystems requiring independent power domain control and fault reporting. Use Value: POK output directly interfaces with EC (Embedded Controller) for hardware-based power state validation, eliminating software polling overhead. |
Use Scenario: Powering precision ADC references, op-amp signal chains, and display drivers in battery-operated test meters and analyzers. IC Role / Device Role / Timing Role: High-accuracy, low-drift voltage source maintaining tight regulation under variable load and temperature conditions. Use Value: ±3% output accuracy over -40°C to +85°C ensures measurement repeatability; thermal shutdown protects against overheating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P252MR | 2.5V fixed output, 300mA, 150mV dropout at 200mA, no POK output, 1.8µA IQ | Lacks power-good signaling; suited for simpler systems where reset coordination is handled externally. | Select when POK is unnecessary and ultra-low IQ (<2µA) is prioritized over dropout performance. |
| Analog Devices ADP160ACBZ-2.5-R7 | 2.5V fixed output, 150mA max, 195mV dropout at 150mA, no POK, 570nA IQ in shutdown | Lower current rating and higher dropout; includes soft-start but no fault flag. | Choose only for low-power sensor nodes where 150mA suffices and minimal shutdown leakage is critical. |
Compared with XC6206P252MR and ADP160ACBZ-2.5-R7, the MAX8888EZK25 uniquely combines 300mA drive, 100mV dropout, and integrated POK in a SOT23-5 package-making it the only option among the three capable of powering demanding RF or processing blocks while providing hardware reset assurance.
Availability
MAX8888EZK25 is available at Aetrix Electronics and suitable for wireless handsets, digital cameras, and notebook computers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
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 MAX8887/MAX8888 family was designed specifically for battery-powered portable equipment requiring low quiescent current, small footprint, and reliable power-good signaling-targeting PDAs, cellular handsets, and ultraportable computing platforms.
FAQ
What is the output voltage tolerance of MAX8888EZK25 over temperature and load?
The MAX8888EZK25 guarantees ±3% output voltage accuracy across the full operating range of -40°C to +85°C and for load currents from 100µA to 300mA. This specification is confirmed in the Electrical Characteristics table of the official datasheet and applies directly to the MAX8888EZK25 variant with its factory-trimmed 2.5V output setting.
Does 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 pinout omits BP and instead includes the POK pin at position 4; therefore, no BP capacitor is used or required for MAX8888EZK25 operation.
What is the minimum input voltage required for MAX8888EZK25 to maintain regulation at 300mA load?
At 300mA load, the MAX8888EZK25 exhibits a typical dropout voltage of 150mV (per Electrical Characteristics table). Therefore, the minimum input voltage to sustain 2.5V regulation is 2.65V. This value is validated in the Typical Operating Characteristics curve "DROPOUT VOLTAGE vs. LOAD CURRENT" for the MAX8888 family.
Can MAX8888EZK25 be used in place of MAX8887EZK25 in an existing design?
MAX8888EZK25 and MAX8887EZK25 share identical pinout, output voltage, and electrical specs except for the BP vs. POK pin swap. Replacing MAX8887EZK25 with MAX8888EZK25 requires routing the BP net to GND or leaving it unconnected, and connecting the POK net to a pullup resistor - no PCB redesign is needed if those modifications are accommodated.
What is the maximum allowable power dissipation for MAX8888EZK25 in a SOT23-5 package?
The MAX8888EZK25 has a maximum continuous power dissipation of 727mW at +70°C ambient, derating by 9.1mW/°C above that temperature. This limit is defined by the SOT23-5 package thermal resistance and is specified in the Absolute Maximum Ratings section of the datasheet for the MAX8888EZK25 device.
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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