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Analog Devices Inc./Maxim Integrated MAX8888EZK31+T
- Part No.:
- MAX8888EZK31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8888EZK31+T.pdf
- Description:
- IC REG LIN 3.1V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,647
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Product details
Overview
MAX8888EZK31+T from Maxim Integrated is a 3.1V fixed-output, 300mA low-dropout linear regulator with open-drain power-OK (POK) output, 100mV dropout at 200mA, 55µA no-load supply current, and thermal/short-circuit protection - designed for battery-powered portable electronics requiring precise voltage regulation and system power monitoring.
For engineers reviewing the MAX8888EZK31+T datasheet, MAX8888EZK31+T pinout, MAX8888EZK31+T application, or MAX8888EZK31+T equivalent, key selection criteria include POK flag functionality, SOT23-5 package compatibility, 3.1V output accuracy (±3%), dropout performance under pulsed load, and shutdown leakage (<0.1µA).
Technical Context
The MAX8888EZK31+T integrates a p-channel MOSFET pass transistor (RDS(ON) ≈ 0.5Ω), error amplifier, 1.25V reference, and internal feedback divider to deliver stable 3.1V output. Its POK circuit monitors VOUT against 93% of nominal (2.883V) with 1% hysteresis and drives low when out-of-regulation.
It operates from 2.5V–5.5V input, maintains 55µA ground current independent of load, and employs foldback current limiting (420mA typical at VOUT > 93% nominal; 300mA continuous). Thermal shutdown activates at +170°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.1V ±3% over temperature and load - ensures stable core logic or RF bias rail within microcontroller or transceiver tolerance bands. |
| Max Continuous Output Current | 300mA - supports moderate-power peripherals like LCD drivers or audio codecs without external boost stages. |
| Dropout Voltage | 100mV at 200mA - enables operation down to 3.2V input with 3.1V output, extending usable battery life in single-cell Li-ion systems. |
| Supply Current (No Load) | 55µA - minimizes quiescent drain during standby, critical for multi-day battery runtime in handheld instruments. |
| POK Threshold Accuracy | 90%–95% of nominal VOUT - provides reliable power-on reset signaling for µC initialization with margin against noise-induced false triggers. |
| Shutdown Current | 0.1µA - reduces system sleep current to sub-microamp level, enabling deep-sleep modes in always-on sensors. |
| Thermal Shutdown Temp | +170°C - protects device during sustained overload or poor PCB thermal design while allowing safe transient overloads. |
Pinout & Package
MAX8888EZK31+T is housed in a RoHS-compliant, thin 5-pin SOT23 package (1mm height, Z5-1 footprint), optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input Supply Rail | 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 IN, OUT, SHDN, and POK; must be low-impedance connection to minimize noise coupling. |
| 3 - SHDN | Active-Low Enable Control | Logic-low disables regulator and forces OUT/POK low; draws <100nA bias current; tolerates up to 6V regardless of VIN/VOUT. |
| 4 - POK | Open-Drain Power-OK Flag | Drives low when VOUT < 93% of 3.1V; requires external 100kΩ pullup to OUT for logic-level output; used for µC POR sequencing. |
| 5 - OUT | Regulated Output | Delivers 3.1V ±3% at up to 300mA; requires 2.2µF ceramic capacitor (ESR < 0.1Ω) to GND for stability and noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Open-Drain POK Output | Enables reliable power-good signaling to microcontrollers without additional level-shifting or pullup sourcing components. |
| P-Channel MOSFET Pass Device | Eliminates base-drive current loss, maintaining 55µA quiescent current even at full 300mA load and in dropout condition. |
| Foldback Current Limiting | Reduces output current to ~420mA when VOUT drops below 93% of 3.1V, preventing thermal runaway during short-circuit events. |
| Thermal Shutdown with Hysteresis | Shuts down at +170°C and re-enables only after cooling by 20°C, preventing oscillation and enabling safe fault recovery in enclosed enclosures. |
| Ultra-Low Shutdown Leakage | 0.1µA shutdown current allows integration into battery-backed real-time clock or sensor wake-up circuits without measurable drain. |
Applications
| Wireless Handsets | Digital Cameras |
|---|---|
Use Scenario: Powering baseband processor I/O rails and camera interface circuitry in dual-SIM smartphones with tight thermal and space constraints. IC Role / Device Role / Timing Role: Primary 3.1V LDO supplying voltage-sensitive digital interfaces (e.g., MIPI CSI-2), with POK confirming stable power before image capture sequence initiation. Use Value: 100mV dropout extends usable battery range by ~150mV per cell; POK eliminates need for external supervisor IC, reducing BOM count. |
Use Scenario: Regulating 3.1V for CMOS image sensor analog front-end and auto-focus motor driver in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Low-noise, high-accuracy voltage source ensuring consistent sensor gain calibration and minimizing image banding artifacts. Use Value: ±3% output accuracy maintains sensor ADC reference integrity; 55µA quiescent current preserves battery charge during standby between shots. |
| PDAs and Palmtop Computers | Hand-Held Instruments |
Use Scenario: Providing clean 3.1V supply to touch-screen controller and flash memory interface in legacy enterprise PDAs with aging Li-ion cells. IC Role / Device Role / Timing Role: Main system LDO with POK-driven boot sequencing, ensuring OS loader only initiates after stable 3.1V rail is confirmed. Use Value: POK hysteresis prevents false resets during brief input dips; SOT23-5 footprint fits legacy 0.5mm-pitch PCB layouts without redesign. |
Use Scenario: Powering precision ADC reference buffers and low-power MCU in portable multimeters and environmental data loggers. IC Role / Device Role / Timing Role: Precision voltage regulator delivering stable 3.1V to 16-bit SAR ADC reference input, with POK validating rail integrity before measurement acquisition. Use Value: 3.1V output matches common ADC internal reference scaling; thermal shutdown prevents calibration drift during extended field use in hot environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS78031QDBVRQ1 | Automotive-grade (-40°C to +125°C), 350mA output, 170mV dropout at 200mA, no POK output | Lacks POK flag; requires external reset IC for power sequencing; higher dropout reduces battery efficiency in portable designs | Select when AEC-Q100 qualification and extended temperature range are mandatory, and POK is implemented elsewhere in system |
| MCP1703T-3102E/MB | 300mA, 600mV dropout at 250mA, 2.5µA quiescent current, no POK, SOT23-5 | Higher dropout limits usable battery range; ultra-low IQ benefits long-term storage but sacrifices transient response and PSRR | Choose for ultra-low-power remote sensors where battery life >2 years outweighs need for fast load transients or system monitoring |
Compared with TPS78031QDBVRQ1 and MCP1703T-3102E/MB, the MAX8888EZK31+T uniquely balances low dropout (100mV), integrated POK, and industry-standard SOT23-5 footprint - making it optimal for cost-sensitive, space-constrained portable devices requiring autonomous power validation without added components.
Availability
MAX8888EZK31+T is available at Aetrix Electronics and suitable for wireless handsets, digital cameras, PDAs and palmtop computers, hand-held instruments, and PCMCIA cards requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8888EZK31+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX8888EZK31+T belongs to the MAX8887/MAX8888 family of low-noise, low-IQ LDOs designed specifically for battery-powered portable equipment where efficiency, small size, and power-good signaling are critical.
FAQ
What is the exact output voltage of the MAX8888EZK31+T?
The MAX8888EZK31+T delivers a factory-trimmed fixed output voltage of 3.1V with ±3% accuracy across -40°C to +85°C temperature range and 100µA–300mA load current. This value is encoded in the part number suffix "31" and verified in the Electrical Characteristics table under Output Voltage Accuracy.
Does the MAX8888EZK31+T include a power-OK (POK) output, and how does it function?
Yes, the MAX8888EZK31+T features an active-low open-drain POK output (Pin 4) that asserts low when VOUT falls below 93% of 3.1V (≈2.883V), with 1% hysteresis. It remains low during shutdown and requires an external 100kΩ pullup resistor to OUT for logic-level interfacing - a key differentiator from the MAX8887 variant.
What is the dropout voltage specification for the MAX8888EZK31+T at full load?
The MAX8888EZK31+T guarantees 150mV maximum dropout voltage at 300mA load and 3.3V output (per Electrical Characteristics table), while typical performance is 100mV at 200mA. For the 3.1V version, dropout remains ≤100mV at 200mA, enabling operation down to 3.2V input while maintaining regulation.
What package type and footprint does the MAX8888EZK31+T use?
The MAX8888EZK31+T uses a thin 5-pin SOT23 package (package code Z5-1, document 21-0113), measuring 1mm in height with standard 0.95mm pitch. It shares pinout compatibility with other MAX8887/MAX8888 variants and requires the same PCB land pattern per Maxim's published outline drawings.
How does the MAX8888EZK31+T handle thermal overload conditions?
The MAX8888EZK31+T incorporates thermal shutdown that disables the pass transistor when junction temperature exceeds +170°C. After shutdown, the device remains off until temperature drops by 20°C (hysteresis), then resumes regulation - preventing latch-up and enabling safe recovery during intermittent overloads without manual reset.
MAX8888EZK31+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):
- 3.1V
- 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
MAX8888EZK31+T FAQ
1.How can I place an order for MAX8888EZK31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8888EZK31+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 MAX8888EZK31+T reliable?
The price and inventory of MAX8888EZK31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8888EZK31+T is usually 5 days.
3.What payment methods are accepted for MAX8888EZK31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8888EZK31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8888EZK31+T?
MAX8888EZK31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8888EZK31+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 MAX8888EZK31+T?
For technical support, including MAX8888EZK31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8888EZK31+T requirements.
6.How does Aetrix verify that MAX8888EZK31+T is sourced from the original manufacturer or authorized distributors?
All MAX8888EZK31+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 MAX8888EZK31+T meets industry standards.
7.What is the process for return or replacement of MAX8888EZK31+T?
All MAX8888EZK31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8888EZK31+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 MAX8888EZK31+T part is unused and in its original packaging.
Return procedure for MAX8888EZK31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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