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Analog Devices Inc./Maxim Integrated MAX8887EZK31-T
- Part No.:
- MAX8887EZK31-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8887EZK31-T.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX8887EZK31-T from Maxim Integrated is a low-noise, 3.1V fixed-output, 300mA low-dropout linear regulator with 100mV dropout at 200mA, 55µA no-load supply current, and 42µVRMS output noise - designed for power-sensitive portable electronics including cellular handsets and PDAs.
For engineers reviewing the MAX8887EZK31-T datasheet, MAX8887EZK31-T pinout, MAX8887EZK31-T application, or MAX8887EZK31-T equivalent, this page delivers verified electrical specs, SOT23-5 pin mapping, thermal/short-circuit protection behavior, and real-world use context for battery-powered system design.
Technical Context
The MAX8887EZK31-T uses an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.5Ω) enabling load-independent 55µA quiescent current and stable operation down to 100mV dropout at 200mA. It features a 1.25V internal reference and error amplifier with factory-trimmed feedback divider for ±2% output accuracy over temperature and load.
No BP pin is used in the MAX8887EZK31-T variant - unlike MAX8887 variants requiring 0.01µF bypass for noise reduction, this part's 42µVRMS noise is specified with COUT = 2.2µF and standard layout; it lacks POK functionality, distinguishing it from MAX8888 series parts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.1V ±2% over -40°C to +85°C, enabling direct replacement of 3.1V rails without external resistors. |
| Max Continuous Output Current | 300mA guaranteed - sufficient to power baseband processors or RF transceivers in handheld devices. |
| Dropout Voltage | 100mV at 200mA - allows regulation down to VIN = 3.2V, extending usable life of single-cell Li-ion batteries. |
| Ground-Pin Current | 55µA at no load, rising to 65µA at 300mA - enables >100-hour standby in always-on portable systems. |
| Output Noise | 42µVRMS (10Hz–100kHz) - low enough for noise-sensitive analog circuits like ADC references or RF VCO supplies. |
| PSRR | 60dB at 1kHz - suppresses switching noise from adjacent DC/DC converters in mixed-signal PCBs. |
| Shutdown Current | 0.1µA - reduces battery drain during deep sleep modes in cellular handsets and wearables. |
Pinout & Package
MAX8887EZK31-T is housed in a thin 5-pin SOT23 package (1mm height), optimized for space-constrained portable designs. Pinout matches the MAX8887 family and is not compatible with MAX8888 due to BP/POK pin assignment differences.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 2.5V–5.5V; requires 2.2µF ceramic capacitor to GND for stability and transient response. |
| 2 - GND | Power ground reference | Low-impedance return path; must be connected directly to PCB ground plane for noise control. |
| 3 - SHDN | Active-low enable control | Pulled high to IN for normal operation; driven low to reduce supply current to 0.1µA and disconnect OUT. |
| 4 - BP | Bypass reference node | Not internally connected in MAX8887EZK31-T - leave unconnected or float; no 0.01µF capacitor required. |
| 5 - OUT | Regulated output | Delivers up to 300mA at 3.1V; requires 2.2µF ceramic capacitor (ESR < 0.2Ω) to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise LDO architecture | 42µVRMS output noise enables clean power for precision analog blocks without added filtering. |
| P-channel MOSFET pass element | Eliminates base-drive current loss, maintaining 55µA quiescent current even at full 300mA load. |
| Foldback current limiting | Reduces output current to ~500mA pulsed under fault conditions, protecting both IC and downstream circuitry. |
| Thermal shutdown with hysteresis | Shuts down at 170°C junction temperature and re-enables only after cooling by 20°C - prevents thermal cycling damage. |
| Factory-trimmed output voltage | 3.1V preset with ±2% accuracy across -40°C to +85°C eliminates need for external feedback resistors. |
Applications
| Cellular Handsets | Digital Cameras |
|---|---|
|
Use Scenario: Powering baseband processor core voltage in GSM/UMTS handsets with single-cell Li-ion battery input. IC Role / Device Role / Timing Role: Primary 3.1V LDO supplying CPU I/O and memory interface logic. Use Value: 100mV dropout extends usable battery range to 3.2V, while 42µVRMS noise avoids digital-to-analog crosstalk in audio subsystems. |
Use Scenario: Supplying image sensor analog front-end and CCD driver circuitry in compact digital cameras. IC Role / Device Role / Timing Role: Low-noise bias source for precision analog signal chain components. Use Value: 60dB PSRR at 1kHz rejects noise from high-frequency DC/DC converters powering digital logic, preserving SNR in captured images. |
| PDAs and Palmtop Computers | PCMCIA Cards |
|
Use Scenario: Regulating 3.1V rail for touch controller, flash memory interface, and LCD driver in palm-sized computing devices. IC Role / Device Role / Timing Role: Main system LDO delivering stable voltage during burst-mode data transfers. Use Value: 55µA quiescent current enables multi-day standby without compromising wake-up responsiveness. |
Use Scenario: Providing regulated 3.1V to PCMCIA Type II card logic and interface buffers in laptops and industrial hosts. IC Role / Device Role / Timing Role: Hot-swap compliant local regulator isolating card power from host bus transients. Use Value: Thermal shutdown and short-circuit protection prevent host port damage during insertion faults or card overloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8860EZK31-T | Same 3.1V output, but higher 120mV dropout at 200mA and 75µA quiescent current. | Lacks BP pin and noise optimization - unsuitable for ultra-low-noise analog rails. | Select when cost sensitivity outweighs noise performance and dropout margin is acceptable. |
| TCS2103-3.1V | 3.1V output, 110mV dropout at 200mA, 60µA quiescent current, no BP pin, no POK. | Lower PSRR (45dB @ 1kHz) and higher noise (65µVRMS) - less effective in noisy mixed-signal environments. | Choose for legacy designs where footprint compatibility exists and noise budget allows 23µVRMS margin. |
Compared with MAX8860EZK31-T and TCS2103-3.1V, the MAX8887EZK31-T delivers superior noise performance and tighter dropout, making it preferred for battery-powered systems where analog integrity and runtime efficiency are critical.
Availability
MAX8887EZK31-T is available at Aetrix Electronics and suitable for cellular handsets, digital cameras, PDAs, PCMCIA cards, and handheld instruments requiring stable component supply and long-term production continuity.
Supply support for MAX8887EZK31-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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX8887/MAX8888 product line was engineered specifically for portable battery-powered equipment - emphasizing ultra-low quiescent current, low dropout, and low-noise operation in minimal SOT23-5 footprint.
FAQ
What is the output voltage tolerance of the MAX8887EZK31-T over temperature and load?
The MAX8887EZK31-T maintains ±2% output voltage accuracy across the full -40°C to +85°C operating temperature range and for load currents from 100µA to 300mA. This specification is guaranteed by design and confirmed in the Electrical Characteristics table of the official datasheet. The MAX8887EZK31-T achieves this via factory-trimmed internal feedback, eliminating drift-prone external resistor networks.
Does the MAX8887EZK31-T include a power-OK (POK) output?
No, the MAX8887EZK31-T does not include a POK output. That feature is exclusive to the MAX8888 series (e.g., MAX8888EZK31-T). The MAX8887EZK31-T has a BP (bypass) pin instead, though it is not connected internally in this variant - leaving it unconnected is correct per the datasheet. Confusion may arise from shared packaging and naming conventions, but pin functionality is strictly model-dependent.
What is the recommended input and output capacitance for stable operation of the MAX8887EZK31-T?
The MAX8887EZK31-T requires a minimum 2.2µF X5R/X7R ceramic capacitor between IN and GND, and another 2.2µF ceramic capacitor between OUT and GND. Both capacitors must have ESR ≤ 0.2Ω. For improved PSRR and transient response, a 4.7µF output capacitor is acceptable. Placement must be within 2mm of the IC pins to minimize trace inductance - critical for stability in high-frequency portable designs.
How does thermal protection operate in the MAX8887EZK31-T during continuous overload?
The MAX8887EZK31-T activates thermal shutdown at 170°C junction temperature, turning off the pass transistor until the die cools by 20°C (to ~150°C), then automatically resumes regulation. This hysteresis prevents destructive thermal cycling. During sustained overload, the device enters pulsed operation - observable as intermittent output - protecting against permanent damage while maintaining safe junction temperatures below the 150°C absolute maximum rating.
Can the MAX8887EZK31-T be used with a 2.8V input supply?
No - the MAX8887EZK31-T requires a minimum input voltage of 2.5V, but to maintain 3.1V regulation, VIN must exceed VOUT by at least the dropout voltage. At 200mA, dropout is 100mV, so VIN ≥ 3.2V is required. At 300mA, typical dropout rises to 150mV, demanding VIN ≥ 3.25V. A 2.8V input would cause immediate dropout and unregulated output - the device cannot sustain 3.1V from 2.8V under any load.
MAX8887EZK31-T 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):
- 3.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 65 µA
- PSRR:
- 60dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MAX8887EZK31-T FAQ
1.How can I place an order for MAX8887EZK31-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8887EZK31-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 MAX8887EZK31-T reliable?
The price and inventory of MAX8887EZK31-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8887EZK31-T is usually 5 days.
3.What payment methods are accepted for MAX8887EZK31-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8887EZK31-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8887EZK31-T?
MAX8887EZK31-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8887EZK31-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 MAX8887EZK31-T?
For technical support, including MAX8887EZK31-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8887EZK31-T requirements.
6.How does Aetrix verify that MAX8887EZK31-T is sourced from the original manufacturer or authorized distributors?
All MAX8887EZK31-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 MAX8887EZK31-T meets industry standards.
7.What is the process for return or replacement of MAX8887EZK31-T?
All MAX8887EZK31-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8887EZK31-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 MAX8887EZK31-T part is unused and in its original packaging.
Return procedure for MAX8887EZK31-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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