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Analog Devices Inc./Maxim Integrated MAX8877EUK39-T
- Part No.:
- MAX8877EUK39-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8877EUK39-T.pdf
- Description:
- IC REG LINEAR LOW NOISE LDO
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX8877EUK39-T from Maxim Integrated is a low-noise, low-dropout linear regulator with preset 3.9V output, delivering up to 150mA from 2.5V–6.5V input. It features 30µVRMS output noise, 165mV dropout at 150mA, and 100µA operating supply current - designed for battery-powered portable electronics requiring stable, clean voltage rails.
For engineers reviewing the MAX8877EUK39-T datasheet, MAX8877EUK39-T pinout, MAX8877EUK39-T application, or MAX8877EUK39-T equivalent, key selection criteria include output accuracy (±1.4%), thermal shutdown (155°C), reverse battery protection, and SOT23-5 regular package compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8877EUK39-T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current independent of load or dropout condition. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
Noise reduction is achieved via a dedicated BP pin with external 0.01µF capacitor forming an 80Hz low-pass filter; shutdown is logic-controlled (active-low SHDN) with 10nA standby current and includes reverse battery protection that limits reverse current to 1mA when VIN or SHDN falls below ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.9V ±1.4% - factory-preset, stable across -40°C to +85°C and 0.1–120mA load |
| Max Output Current | 150mA - continuous delivery without thermal shutdown under proper PCB layout |
| Dropout Voltage | 165mV at 150mA - enables operation down to VIN = 4.065V while maintaining regulated 3.9V |
| Output Noise | 30µVRMS (10Hz–100kHz) - minimized by 0.01µF BP capacitor; suitable for RF/ADC power domains |
| Quiescent Current | 100µA - constant across load, dropout, and temperature; extends battery life in always-on systems |
| Shutdown Current | 10nA - enables deep-sleep modes in portable devices with minimal leakage impact |
| Thermal Shutdown | 155°C with 15°C hysteresis - self-recovering pulsed operation prevents permanent damage during overload |
Pinout & Package
MAX8877EUK39-T is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical reference and thermal path. Recommended PCB layout includes soldering GND to a large copper area for heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply connection | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND for stability and line-transient suppression |
| 2 GND | Ground reference and thermal pad | Electrical return path and primary heat conduction route; must connect to large PCB copper area |
| 3 SHDN | Active-low enable control | Pull low to enter 10nA shutdown; pull high (≥2.0V) or tie to IN for normal operation |
| 4 BP | Bypass capacitor terminal | Connects to 0.01µF ceramic cap to reduce reference noise; determines startup time and output spectral purity |
| 5 OUT | Regulated output | Delivers 3.9V at up to 150mA; requires ≥1µF (ESR <0.2Ω) ceramic cap for VOUT ≥2.5V stability |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss; maintains 100µA IQ even in dropout or heavy-load conditions |
| Reverse battery protection | Blocks >99% of reverse current (<1mA) when VIN or SHDN goes negative - prevents system damage |
| Internal current limiting | Guarantees ≥160mA minimum current limit; allows indefinite short-circuit without device failure |
| Low-noise BP filtering | 0.01µF capacitor on BP pin reduces output noise to 30µVRMS - critical for sensitive analog/RF stages |
| Thermal overload recovery | Hysteresis-based restart (155°C trip / 140°C resume) enables safe, autonomous fault recovery |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
Use Scenario: Powering baseband processor core voltage in GSM/CDMA handsets with Li-ion battery input. IC Role / Device Role / Timing Role: Primary LDO supplying clean 3.9V rail to CPU subsystem during active and sleep cycles. Use Value: 100µA quiescent current extends standby time; 30µVRMS noise avoids digital switching coupling into RF front-end. |
Use Scenario: Regulating 3.3V/3.9V auxiliary supply for PCMCIA card interface logic and memory controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling host bus noise from card peripherals. Use Value: Pin-compatible '2982 footprint simplifies legacy design upgrades; 165mV dropout supports full battery discharge range. |
| Hand-Held Instruments | Electronic Planners |
Use Scenario: Providing stable 3.9V supply to precision ADCs and op-amps in portable multimeters or data loggers. IC Role / Device Role / Timing Role: Low-noise analog rail generator isolating measurement circuitry from digital switching noise. Use Value: 30µVRMS output noise ensures sub-LSB ADC accuracy; thermal shutdown protects against enclosure overheating. |
Use Scenario: Powering microcontroller and LCD driver in battery-operated PDAs and scheduling assistants. IC Role / Device Role / Timing Role: Main system regulator managing dynamic load transitions during button press and display update events. Use Value: Fast 300µs shutdown exit delay enables responsive wake-up; reverse battery protection prevents user-insertion faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8878EUK39-T | Includes auto-discharge function (300Ω discharge path); otherwise identical specs and pinout | Required where rapid output discharge during shutdown is needed (e.g., multi-rail sequencing) | Select MAX8878EUK39-T only if active output discharge is mandatory; MAX8877EUK39-T saves board space when unused |
| MCP1700T-3902E/TT | Lower max current (250mA), higher dropout (600mV @ 250mA), no BP pin or reverse battery protection | Suitable for cost-sensitive, non-battery-critical applications; lacks noise performance and protection features | Choose only for non-portable, low-noise tolerance designs; not drop-in due to different pinout and missing protections |
Compared with MAX8877EUK39-T, the MAX8878EUK39-T adds auto-discharge without sacrificing noise or efficiency, while the MCP1700T-3902E/TT trades protection and noise performance for lower cost and higher current - making it unsuitable for battery-powered precision systems.
Availability
MAX8877EUK39-T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, hand-held instruments, and electronic planners requiring stable component supply across industrial temperature range (-40°C to +85°C).
Supply support for MAX8877EUK39-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, medical, and portable applications.
The MAX8877/MAX8878 product line targets battery-powered portable electronics needing ultra-low noise, low IQ, and robust protection - optimized for long runtime and signal integrity in space-constrained designs.
FAQ
What is the output voltage tolerance of the MAX8877EUK39-T over temperature and load?
The MAX8877EUK39-T guarantees ±1.4% output voltage accuracy across -40°C to +85°C ambient temperature and 0.1mA–120mA load current. At +25°C and 0.1mA load, typical deviation is ±1.4%; worst-case drift remains within specification limits under full operating conditions. This accuracy is maintained without external components due to factory-trimmed internal feedback resistors.
Does the MAX8877EUK39-T require an external bypass capacitor on the BP pin?
Yes - the MAX8877EUK39-T requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µVRMS output noise. Omitting this capacitor increases noise significantly; using >0.1µF extends startup time without meaningful noise improvement. The BP pin connects internally to a 200kΩ resistor forming an 80Hz low-pass filter critical for reference stability.
Can the MAX8877EUK39-T be used with input voltages below 2.5V?
No - the MAX8877EUK39-T has a minimum input voltage rating of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V is undefined and may result in unregulated output, increased dropout, or failure to start. For sub-2.5V inputs, consider alternative regulators such as the MAX1726 series.
How does reverse battery protection work in the MAX8877EUK39-T?
The MAX8877EUK39-T monitors polarity at both IN and SHDN pins; if either falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to <1mA. This prevents damage during incorrect battery insertion or accidental reverse connection - a key reliability feature for consumer handheld devices where field failures must be avoided.
Is the MAX8877EUK39-T pin-compatible with the industry-standard '2982 regulator?
Yes - the MAX8877EUK39-T uses the same 5-pin SOT23-5 pinout as the industry-standard '2982 family, with identical IN, GND, SHDN, BP, and OUT assignments. This enables direct replacement in existing layouts without PCB modification, while delivering improved dropout (165mV vs. typical 350mV) and lower noise (30µVRMS vs. ~100µVRMS).
MAX8877EUK39-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 3.9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX8877EUK39-T FAQ
1.How can I place an order for MAX8877EUK39-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8877EUK39-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 MAX8877EUK39-T reliable?
The price and inventory of MAX8877EUK39-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8877EUK39-T is usually 5 days.
3.What payment methods are accepted for MAX8877EUK39-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8877EUK39-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8877EUK39-T?
MAX8877EUK39-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8877EUK39-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 MAX8877EUK39-T?
For technical support, including MAX8877EUK39-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8877EUK39-T requirements.
6.How does Aetrix verify that MAX8877EUK39-T is sourced from the original manufacturer or authorized distributors?
All MAX8877EUK39-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 MAX8877EUK39-T meets industry standards.
7.What is the process for return or replacement of MAX8877EUK39-T?
All MAX8877EUK39-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8877EUK39-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 MAX8877EUK39-T part is unused and in its original packaging.
Return procedure for MAX8877EUK39-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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