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Analog Devices Inc./Maxim Integrated MAX8887EZK31
- Part No.:
- MAX8887EZK31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8887EZK31.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:1,058
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Product details
Overview
MAX8887EZK31 from Maxim Integrated is a low-noise, 300mA low-dropout linear regulator with fixed +3.1V output, optimized for battery-powered portable electronics. It operates from +2.5V to +5.5V input, delivers 100mV dropout at 200mA load, draws only 55µA no-load supply current, and achieves 42µVRMS output noise with BP bypass capacitor - enabling clean power for RF sections and precision analog circuitry in handheld devices.
For engineers reviewing the MAX8887EZK31 datasheet, MAX8887EZK31 pinout, MAX8887EZK31 application, or MAX8887EZK31 equivalent, this page provides verified technical context, validated SOT23-5 pin mapping, confirmed low-noise LDO specifications, and real-world selection guidance for portable power management designs requiring stable 3.1V rail generation.
Technical Context
The MAX8887EZK31 uses an internal P-channel MOSFET pass transistor (RDS(ON) ≈ 0.5Ω) to achieve ultra-low quiescent current independent of load - critical for battery runtime extension. Its error amplifier compares feedback from an internal 1.25V reference against a factory-trimmed resistive divider to maintain ±2% output accuracy over temperature and load.
Noise reduction is implemented via dedicated BP pin: a 0.01µF ceramic capacitor between BP and GND forms a low-pass filter that suppresses reference noise, yielding 42µVRMS integrated output noise (10Hz–100kHz). The device lacks POK functionality - distinguishing it from MAX8888 variants - and relies on active-low SHDN for micropower shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +3.1V fixed - factory-trimmed, no external resistor required; enables compact layout for single-rail systems. |
| Max Output Current | 300mA continuous - sufficient for baseband processors, audio codecs, or sensor subsystems in handheld devices. |
| Dropout Voltage | 100mV at 200mA - allows operation down to VIN = 3.2V, extending usable battery life in Li-ion and Li-poly systems. |
| Ground Pin Current | 55µA no-load - remains constant across load and input voltage, minimizing standby power loss. |
| Output Noise | 42µVRMS (10Hz–100kHz) - achieved with 0.01µF BP bypass; suitable for powering PLLs, ADCs, and RF front-ends. |
| PSRR | 60dB at 1kHz - rejects switching noise from DC/DC converters upstream, improving signal integrity in mixed-signal designs. |
| Shutdown Current | 0.1µA - reduces system-level leakage during sleep modes; SHDN pin accepts up to 6V logic regardless of VIN. |
Pinout & Package
MAX8887EZK31 is housed in a thin 5-pin SOT23 package (1mm height), compatible with standard SOT23-5 footprints and reflow processes. The package supports high-density PCB layouts and thermal performance up to 727mW at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts +2.5V to +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 core and bypass capacitors; must be connected directly to PCB ground plane. |
| 3 - SHDN | Active-low enable control | Pull low to disable output and reduce supply current to 0.1µA; pull high (≥1.6V) or tie to IN for normal operation. |
| 4 - BP | Reference bypass node | Connect 0.01µF ceramic capacitor to GND to reduce reference noise and achieve 42µVRMS output noise specification. |
| 5 - OUT | Regulated output terminal | Delivers +3.1V at up to 300mA; requires ≥2.2µF ceramic capacitor (ESR ≤ 0.1Ω) to GND for loop stability and load transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 42µVRMS output noise with BP bypass - enables direct powering of sensitive RF/analog circuits without additional filtering. |
| P-channel pass transistor | 0.5Ω RDS(ON) - eliminates base-drive current loss, maintaining 55µA quiescent current even at full 300mA load and in dropout. |
| Thermal & short-circuit protection | 170°C shutdown with 20°C hysteresis - prevents damage during sustained overload or poor heatsinking; foldback current limiting activates below 93% VOUT. |
| Micropower shutdown | 0.1µA supply current in shutdown - preserves battery charge during extended idle periods in portable instrumentation and wearables. |
| High PSRR at low frequency | 60dB at 1kHz - suppresses ripple from upstream switching regulators, reducing need for post-regulation LC filters. |
Applications
| Wireless Handsets | Digital Cameras |
|---|---|
|
Use Scenario: Powering RF transceiver ICs and baseband processors during active transmission/reception cycles. IC Role / Device Role / Timing Role: Primary 3.1V LDO supplying noise-sensitive RF sections and digital core logic. Use Value: 42µVRMS noise and 60dB PSRR prevent AM modulation of RF carriers and reduce bit-error rates in GSM/EDGE bands. |
Use Scenario: Providing stable 3.1V bias to CMOS image sensors and ISP (image signal processor) cores during burst capture. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO delivering regulated power to analog front-end and pixel readout circuitry. Use Value: 100mV dropout at 200mA enables operation until battery reaches 3.2V, maximizing usable capacity per charge cycle. |
| Notebook Subsystems | Hand-Held Instruments |
|
Use Scenario: Supplying 3.1V to embedded controller (EC) or keyboard controller (KBC) in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary LDO generating isolated 3.1V rail for always-on microcontroller domains. Use Value: 55µA no-load current and 0.1µA shutdown current minimize parasitic drain on main battery during suspend-to-RAM states. |
Use Scenario: Powering precision ADCs, op-amps, and display drivers in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Precision voltage source ensuring stable reference and analog signal chain performance. Use Value: ±2% output accuracy over -40°C to +85°C and low thermal drift preserve measurement repeatability across environmental conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8860EUK31 | Same 3.1V output, but 150mA max current and higher 200mV dropout at 100mA; no BP pin or noise optimization. | Limited to lower-power peripherals (e.g., I²C sensors); unsuitable for RF or high-current analog loads. | Select MAX8887EZK31 when >200mA load capability, <100mV dropout, or sub-50µVRMS noise is required. |
| TLS850F3TAV50 | Automotive-grade 3.1V LDO with 500mA rating, but 200µA quiescent current and no BP pin; AEC-Q100 qualified. | Designed for automotive infotainment and body electronics; not optimized for portable battery life or RF noise. | Choose MAX8887EZK31 for consumer portables where micropower operation and ultra-low noise are mandatory. |
Compared with MAX8860EUK31 and TLS850F3TAV50, the MAX8887EZK31 uniquely balances 300mA delivery, 100mV dropout, 55µA quiescent current, and 42µVRMS noise - making it the only option among the three suited for RF-sensitive, battery-constrained handheld applications.
Availability
MAX8887EZK31 is available at Aetrix Electronics and suitable for wireless handsets, digital cameras, notebook subsystems, and hand-held instruments requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX8887EZK31 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 series was designed specifically for portable battery-powered equipment - emphasizing micropower operation, low noise, and small-footprint packaging to extend runtime and simplify power architecture in space-constrained devices.
FAQ
What is the output voltage tolerance of the MAX8887EZK31 over temperature and load?
The MAX8887EZK31 guarantees ±2% output voltage accuracy across the full -40°C to +85°C operating temperature range and for load currents from 100µA to 300mA. At +25°C and 100mA load, typical deviation is ±1.2%. This tight tolerance ensures reliable operation of downstream logic and analog components without external trimming or calibration - a key requirement for the MAX8887EZK31 in production-grade portable designs.
Does the MAX8887EZK31 include a power-good (POK) output?
No, the MAX8887EZK31 does not include a POK output. That feature is exclusive to the MAX8888 family variants (e.g., MAX8888EZK31). The MAX8887EZK31 is optimized for low-noise operation and omits the open-drain POK pin to reduce complexity and cost. If system-level power monitoring is required, external supervision ICs or µC GPIO polling of the MAX8887EZK31 output must be used instead.
What capacitor values and types are required for stable operation of the MAX8887EZK31?
The MAX8887EZK31 requires a 2.2µF ceramic capacitor (ESR ≤ 0.1Ω) between OUT and GND, and a 2.2µF ceramic capacitor between IN and GND. Additionally, a 0.01µF ceramic capacitor must be placed between BP and GND to achieve the specified 42µVRMS output noise. All capacitors must be placed as close as possible to their respective pins to minimize trace inductance and ensure stability across load transients.
Can the MAX8887EZK31 be used with lithium-ion battery input?
Yes, the MAX8887EZK31 is explicitly designed for lithium-ion and lithium-polymer battery-powered systems. Its +2.5V to +5.5V input range accommodates fully charged (4.2V) down to end-of-discharge (~3.2V) battery voltages while maintaining regulation at +3.1V output. The 100mV dropout at 200mA ensures usable runtime extends to lower battery voltages - a critical advantage for the MAX8887EZK31 in portable applications where battery efficiency is paramount.
How does the MAX8887EZK31 achieve low quiescent current under heavy load?
The MAX8887EZK31 achieves 55µA quiescent current independent of load by using an internal P-channel MOSFET pass transistor instead of a bipolar PNP. Unlike PNP-based LDOs, the PMOS device requires no gate/base drive current - eliminating load-dependent quiescent current rise. This architecture allows the MAX8887EZK31 to maintain micropower operation even at full 300mA output, directly enhancing battery life in always-on portable devices.
MAX8887EZK31 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 FAQ
1.How can I place an order for MAX8887EZK31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8887EZK31 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 reliable?
The price and inventory of MAX8887EZK31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8887EZK31 is usually 5 days.
3.What payment methods are accepted for MAX8887EZK31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8887EZK31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8887EZK31?
MAX8887EZK31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8887EZK31 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?
For technical support, including MAX8887EZK31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8887EZK31 requirements.
6.How does Aetrix verify that MAX8887EZK31 is sourced from the original manufacturer or authorized distributors?
All MAX8887EZK31 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 meets industry standards.
7.What is the process for return or replacement of MAX8887EZK31?
All MAX8887EZK31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8887EZK31, 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 part is unused and in its original packaging.
Return procedure for MAX8887EZK31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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