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Analog Devices Inc./Maxim Integrated MAX8887EZK28+T
- Part No.:
- MAX8887EZK28+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8887EZK28+T.pdf
- Description:
- IC REG LIN 2.8V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,506
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Product details
Overview
MAX8887EZK28+T from Maxim Integrated is a low-noise, 300mA low-dropout linear regulator with fixed 2.85V output, optimized for battery-powered portable electronics. It operates from 2.5V to 5.5V input, delivers 100mV dropout at 200mA, features 42µVRMS output noise (with BP bypass), and draws only 55µA quiescent current - enabling extended runtime in PDAs, wireless handsets, and digital cameras.
For engineers reviewing the MAX8887EZK28+T datasheet, MAX8887EZK28+T pinout, MAX8887EZK28+T application, or MAX8887EZK28+T equivalent, key selection criteria include guaranteed 300mA output under dropout conditions, ±2% output voltage accuracy over temperature and load, micropower shutdown (0.1µA), thermal/short-circuit protection, and SOT23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX8887EZK28+T uses an internal PMOS pass transistor (RDS(ON) ≈ 0.5Ω) to achieve low dropout and load-independent 55µA supply current. Its error amplifier compares the regulated output against a 1.25V reference, with factory-trimmed feedback for 2.85V nominal output.
Noise reduction is enabled via the BP pin: a 0.01µF ceramic capacitor between BP and GND forms a low-pass filter, reducing output noise to 42µVRMS (10Hz–100kHz). Unlike the MAX8888, it lacks POK functionality and instead prioritizes ultra-low noise performance for sensitive analog or RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85V ±2% over -40°C to +85°C and 100µA–300mA load - ensures stable core voltage for 2.8V logic rails without external resistors. |
| Dropout Voltage | 100mV at 200mA - allows operation down to VIN = 2.95V, extending usable battery life in single-cell Li-ion or dual-cell alkaline systems. |
| Output Noise | 42µVRMS (10Hz–100kHz, CBP = 0.01µF) - suitable for powering ADC references, RF synthesizers, or audio codecs requiring clean DC. |
| Quiescent Current | 55µA at no load, independent of output current - minimizes standby power loss in always-on subsystems. |
| Shutdown Current | 0.1µA when SHDN = GND - enables deep-sleep modes in portable devices without compromising wake-up latency. |
| PSRR | 60dB at 1kHz (CBP = 0.01µF, COUT = 4.7µF) - suppresses switching noise from upstream DC/DC converters feeding the LDO. |
| Protection Features | Thermal shutdown (170°C trip, 20°C hysteresis), short-circuit foldback limiting, and output current limit (~420mA at VOUT > 93% of 2.85V) - ensures robustness during fault conditions. |
Pinout & Package
MAX8887EZK28+T is housed in a thin 5-pin SOT23 package (1mm height), RoHS-compliant and lead-free. Pin assignments are validated per Maxim's official pin configuration diagram for MAX8887.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply connection | Accepts 2.5V–5.5V; requires 2.2µF ceramic bypass to GND near pin for stability and transient response. |
| 2 GND | Power ground reference | Common return path for IN, OUT, SHDN, and BP; must be low-impedance plane for noise control. |
| 3 SHDN | Active-low enable control | Pull low to disable regulator (0.1µA IQ); pull high to IN for normal operation; supports up to 6V logic levels. |
| 4 BP | Reference bypass terminal | Connect 0.01µF ceramic capacitor to GND to reduce reference noise and achieve 42µVRMS output noise. |
| 5 OUT | Regulated output | Delivers up to 300mA at 2.85V; requires 2.2µF ceramic capacitor (ESR < 0.1Ω) to GND for stability and PSRR optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 42µVRMS output noise enabled by dedicated BP pin and 0.01µF bypass - critical for precision analog signal chains. |
| PMOS pass architecture | Eliminates base-drive current; maintains 55µA IQ across full 0–300mA load range - unlike PNP-based LDOs that increase IQ in dropout. |
| Ultra-low dropout | 100mV at 200mA (typical) - enables use with aging batteries or low-headroom supplies where VIN may dip close to VOUT. |
| Micropower shutdown | 0.1µA shutdown current with fast wake-up - preserves battery charge during system sleep without sacrificing responsiveness. |
| Factory-trimmed output | 2.85V ±2% accuracy over full temperature and load range - eliminates need for external feedback components or calibration. |
Applications
| Wireless Handsets | Digital Cameras |
|---|---|
Use Scenario: Powering RF transceiver bias circuits and baseband processor I/O rails in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Low-noise local LDO delivering clean 2.85V to sensitive RF front-end stages and ADC drivers. Use Value: 42µVRMS noise and 60dB PSRR at 1kHz prevent AM-to-PM distortion and maintain EVM performance under noisy DC/DC switching conditions. |
Use Scenario: Supplying image sensor analog front-end (AFE) and CCD driver circuitry in compact digital still cameras. IC Role / Device Role / Timing Role: Primary 2.85V analog rail regulator with tight load/temperature regulation for pixel-level signal integrity. Use Value: ±2% output accuracy and 100mV dropout ensure consistent sensor bias across battery discharge, preserving dynamic range and SNR. |
| PDAs and Palmtop Computers | PCMCIA Cards |
Use Scenario: Providing core voltage to ARM-based application processors and memory interfaces in handheld PDAs. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent LDO supporting dynamic voltage scaling and deep-sleep states. Use Value: 55µA no-load IQ and 0.1µA shutdown current extend battery life during idle periods without compromising wake-up speed. |
Use Scenario: Regulating 2.85V for PCMCIA card controller logic and interface buffers in laptop expansion slots. IC Role / Device Role / Timing Role: Compact, thermally robust LDO meeting PCMCIA thermal envelope constraints in confined card-edge spaces. Use Value: SOT23-5 footprint and 1mm height enable direct placement on thin PCMCIA cards; thermal shutdown prevents overheating during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P282MR | 2.8V fixed output, 150mV dropout at 100mA, 25µVRMS noise (no BP pin), 12µA IQ | Lacks BP pin for noise filtering; lower noise but less configurable; rated for 150mA only. | Select when ultra-low IQ and moderate load (<150mA) outweigh need for 300mA capability and BP-enabled noise tailoring. |
| Analog Devices ADP121-ACBZ-2.85-R7 | 2.85V output, 135mV dropout at 150mA, 40µVRMS noise (no BP), 30µA IQ, includes soft-start | No BP pin; lower max current (150mA); adds soft-start but no thermal hysteresis spec. | Prefer for cost-sensitive designs needing soft-start and tighter initial accuracy (±1%), but not for 300mA pulsed loads or BP-driven noise optimization. |
Compared with XC6206P282MR and ADP121-ACBZ-2.85-R7, the MAX8887EZK28+T uniquely combines 300mA output, BP-enabled 42µVRMS noise control, and 100mV dropout - making it the only option among the three qualified for high-current, ultra-low-noise portable analog rails.
Availability
MAX8887EZK28+T is available at Aetrix Electronics and suitable for notebook computers, wireless handsets, and digital cameras requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8887EZK28+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 series was designed specifically for ultra-low-noise, micropower regulation in space- and battery-constrained portable electronics - emphasizing dropout efficiency, output accuracy, and integrated protection without external components.
FAQ
What is the exact output voltage tolerance of the MAX8887EZK28+T over temperature and load?
The MAX8887EZK28+T guarantees ±2% output voltage accuracy across the full operating range: -40°C to +85°C ambient temperature and 100µA to 300mA load current. This specification is verified per Maxim's Electrical Characteristics table and applies directly to the MAX8887EZK28+T, not the broader MAX8887 family.
Does the MAX8887EZK28+T include a power-OK (POK) output?
No, the MAX8887EZK28+T does not include a POK output. That feature is exclusive to the MAX8888 variant. The MAX8887EZK28+T is the low-noise version and substitutes the POK pin with the BP (bypass) pin for noise filtering - confirmed by the pin configuration diagram and "Features" section in the datasheet.
What capacitor values are required for stable operation of the MAX8887EZK28+T?
The MAX8887EZK28+T 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 values validated in the "Capacitor Selection and Regulator Stability" section.
Can the MAX8887EZK28+T operate with a 2.5V input when regulating 2.85V output?
No - the MAX8887EZK28+T cannot regulate 2.85V output from a 2.5V input. Its minimum input voltage is VOUT + dropout. With 100mV dropout at 200mA, the absolute minimum VIN is 2.95V. At light loads, dropout decreases, but the device enters unregulated operation below ~2.88V input - confirmed by the "Operating Region and Power Dissipation" section and typical curves.
Is the MAX8887EZK28+T pin-compatible with other MAX8887 variants like MAX8887EZK33+T?
Yes, all MAX8887 variants including MAX8887EZK28+T and MAX8887EZK33+T share identical pinout, package (SOT23-5), and electrical interface - differing only in factory-trimmed output voltage. This allows drop-in replacement across the MAX8887 family for design flexibility without PCB changes.
MAX8887EZK28+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):
- 2.8V
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MAX8887EZK28+T FAQ
1.How can I place an order for MAX8887EZK28+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8887EZK28+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 MAX8887EZK28+T reliable?
The price and inventory of MAX8887EZK28+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8887EZK28+T is usually 5 days.
3.What payment methods are accepted for MAX8887EZK28+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8887EZK28+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8887EZK28+T?
MAX8887EZK28+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8887EZK28+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 MAX8887EZK28+T?
For technical support, including MAX8887EZK28+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8887EZK28+T requirements.
6.How does Aetrix verify that MAX8887EZK28+T is sourced from the original manufacturer or authorized distributors?
All MAX8887EZK28+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 MAX8887EZK28+T meets industry standards.
7.What is the process for return or replacement of MAX8887EZK28+T?
All MAX8887EZK28+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8887EZK28+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 MAX8887EZK28+T part is unused and in its original packaging.
Return procedure for MAX8887EZK28+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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