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Analog Devices Inc./Maxim Integrated MAX8888EZK22+T
- Part No.:
- MAX8888EZK22+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8888EZK22+T.pdf
- Description:
- IC REG LIN 2.2V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,128
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Product details
Overview
MAX8888EZK22+T from Maxim Integrated is a low-dropout linear regulator delivering 300mA continuous output at 2.2V with 100mV dropout at 200mA, featuring an active-low open-drain POK flag and 55µA no-load quiescent current. It operates from 2.5V–5.5V input and targets power management in portable battery-powered systems including wireless handsets and PDAs.
For engineers reviewing the MAX8888EZK22+T datasheet, MAX8888EZK22+T pinout, MAX8888EZK22+T application, or MAX8888EZK22+T equivalent, key selection criteria include guaranteed 2.2V output accuracy (±3%), thermal/short-circuit protection, SOT23-5 package compatibility, and POK flag timing behavior under load transients and undervoltage conditions.
Technical Context
The MAX8888EZK22+T integrates a p-channel MOSFET pass transistor with 0.5Ω RDS(ON), enabling low dropout and load-independent 55µA ground current. Its error amplifier compares feedback from an internal voltage divider against a 1.25V reference to regulate output.
POK functionality uses a comparator monitoring VOUT against 92.5%–95% of nominal voltage with 1% hysteresis; the open-drain output requires external pullup and asserts low during startup, dropout, or shutdown. Thermal shutdown activates at +170°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.2V ±3% over -40°C to +85°C, factory-preset - eliminates external resistor network and calibration effort. |
| Max Continuous Output Current | 300mA - supports core logic rails in handheld devices without derating at +70°C ambient. |
| Dropout Voltage | 100mV at 200mA - enables operation down to 2.4V input for 2.2V output, extending usable battery life in Li-ion discharge profiles. |
| Quiescent Current | 55µA at no load - maintains ultra-low standby power in always-on subsystems like real-time clocks or sensor interfaces. |
| POK Threshold Accuracy | 92.5% to 95% of nominal VOUT - provides reliable power-good assertion for µC reset sequencing with minimal external components. |
| Shutdown Current | 0.1µA - reduces system leakage to sub-nA levels when paired with high-impedance SHDN pullup. |
| PSRR @ 1kHz | 40dB - suppresses switching noise from adjacent DC-DC converters feeding the LDO input rail. |
Pinout & Package
MAX8888EZK22+T is housed in a RoHS-compliant, thin-profile 5-pin SOT23 package (1mm height), optimized for space-constrained portable PCB layouts.
| 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 indicator | Drives low when VOUT < 92.5% of 2.2V; requires external pullup (e.g., 100kΩ to VOUT) for logic-level signaling. |
| 5 - OUT | Regulated output | Delivers 2.2V ±3% at up to 300mA; requires ≥2.2µF ceramic capacitor (ESR < 0.1Ω) to GND for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| p-Channel MOSFET pass element | Enables 100mV dropout at 200mA and eliminates base-drive current loss - critical for efficiency in low-VIN battery scenarios. |
| Integrated foldback current limiting | Reduces short-circuit current to 420mA when VOUT drops below 93% of 2.2V - protects downstream circuitry during fault events. |
| Thermal shutdown with hysteresis | Disables output at +170°C junction temperature and re-enables only after cooling by 20°C - prevents thermal runaway in enclosed enclosures. |
| 0.1µA shutdown supply current | Minimizes battery drain during deep sleep modes - extends shelf life and runtime in IoT edge nodes and wearables. |
| POK flag with 1% hysteresis | Provides clean, bounce-free power-good signal for microcontroller reset timing - avoids false resets during brownout recovery. |
Applications
| Wireless Handsets | Digital Cameras |
|---|---|
Use Scenario: Powering RF transceiver bias rails and baseband processor I/O banks during burst transmission. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO supplying stable 2.2V to sensitive analog front-end circuitry. Use Value: 100mV dropout allows operation through full Li-ion discharge curve (4.2V → 3.0V), while POK ensures clean wake-up sequencing after sleep mode. |
Use Scenario: Supplying image sensor interface and ISP core logic in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Primary 2.2V rail regulator with integrated POK for coordinated power-up of sensor and processing subsystems. Use Value: 55µA quiescent current minimizes standby drain; thermal shutdown prevents overheating during extended video capture sessions. |
| Notebook Subsystems | Hand-Held Instruments |
Use Scenario: Regulating auxiliary 2.2V supply for USB controller PHY or embedded security module. IC Role / Device Role / Timing Role: Secondary LDO with independent enable and POK signaling for modular power domain control. Use Value: SHDN pin enables dynamic power gating; POK output synchronizes firmware initialization with rail stabilization. |
Use Scenario: Providing precision 2.2V reference for ADC front-end and display driver in battery-operated multimeters. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage source ensuring measurement repeatability across temperature and battery state. Use Value: ±3% output accuracy and 40dB PSRR at 1kHz reduce measurement error from supply ripple and digital noise coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P222MR-G | 2.2V fixed output, 150mA max, no POK, 350mV dropout at 100mA | Lacks power-good signaling and higher current capability - suitable only for non-critical, low-power sensor rails. | Select when POK is unnecessary and board space permits larger dropout margin; not drop-in due to lower current and missing POK pin. |
| Diodes Inc. AP2204K-2.2TRG1 | 2.2V fixed output, 300mA, no POK, 250mV dropout at 300mA, 65µA IQ | Higher dropout and no POK flag - requires external monitoring circuitry for reset generation. | Choose if cost sensitivity outweighs need for integrated POK and ultra-low dropout; pinout differs (SOT-23-5 vs. SOT-25). |
Compared with XC6206P222MR-G and AP2204K-2.2TRG1, the MAX8888EZK22+T uniquely combines 300mA capability, 100mV dropout, and integrated POK in a standard SOT23-5 footprint - enabling simpler, more robust power sequencing in space- and performance-constrained portable designs.
Availability
MAX8888EZK22+T is available at Aetrix Electronics and suitable for wireless handsets, digital cameras, notebook subsystems, and hand-held instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8888EZK22+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 family delivers ultra-low-quiescent-current LDOs with integrated POK for battery-powered equipment - targeting extended runtime, reliable power sequencing, and minimal PCB area in handheld and wearable electronics.
FAQ
What is the output voltage tolerance of the MAX8888EZK22+T over temperature and load?
The MAX8888EZK22+T guarantees ±3% output voltage accuracy across the full operating range of -40°C to +85°C and for load currents from 100µA to 300mA. At +25°C and 100mA load, typical deviation is ±1.2%. This tolerance is maintained without external trimming components due to factory-set internal feedback resistors.
Does the MAX8888EZK22+T 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 MAX8888EZK22+T. The MAX8888EZK22+T uses a different internal architecture that omits the BP pin; its pinout is IN-GND-SHDN-POK-OUT. Refer to the MAX8888 functional diagram and pin description for correct layout.
How does the POK output behave during shutdown of the MAX8888EZK22+T?
During shutdown (SHDN = low), the MAX8888EZK22+T drives both OUT and POK low. The POK pin remains actively pulled low regardless of output voltage level - it does not float or go high-impedance. This ensures deterministic reset behavior in systems where POK feeds a microcontroller's reset input.
What is the minimum input voltage required for regulation at 2.2V output with 300mA load?
At 300mA load, the MAX8888EZK22+T exhibits a maximum dropout voltage of 150mV (per Electrical Characteristics table). Therefore, the minimum input voltage for regulation is 2.2V + 0.15V = 2.35V. For guaranteed 100mV dropout, limit load to 200mA - enabling stable 2.2V output down to 2.4V input.
Can the MAX8888EZK22+T be used with ceramic output capacitors having ESR above 0.1Ω?
No - the MAX8888EZK22+T requires an output capacitor with ESR ≤ 0.1Ω to ensure loop stability and optimal transient response. Ceramic capacitors meeting this specification (e.g., X5R/X7R 2.2µF in 0603 or 0805) are recommended. Higher-ESR capacitors such as tantalum or aluminum electrolytic may cause oscillation or excessive overshoot during load steps.
MAX8888EZK22+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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.2V
- 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
MAX8888EZK22+T FAQ
1.How can I place an order for MAX8888EZK22+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8888EZK22+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 MAX8888EZK22+T reliable?
The price and inventory of MAX8888EZK22+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8888EZK22+T is usually 5 days.
3.What payment methods are accepted for MAX8888EZK22+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8888EZK22+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8888EZK22+T?
MAX8888EZK22+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8888EZK22+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 MAX8888EZK22+T?
For technical support, including MAX8888EZK22+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8888EZK22+T requirements.
6.How does Aetrix verify that MAX8888EZK22+T is sourced from the original manufacturer or authorized distributors?
All MAX8888EZK22+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 MAX8888EZK22+T meets industry standards.
7.What is the process for return or replacement of MAX8888EZK22+T?
All MAX8888EZK22+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8888EZK22+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 MAX8888EZK22+T part is unused and in its original packaging.
Return procedure for MAX8888EZK22+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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