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Analog Devices Inc./Maxim Integrated MAX8877EUK42-T
- Part No.:
- MAX8877EUK42-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8877EUK42-T.pdf
- Description:
- IC REG LINEAR LOW NOISE LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX8877EUK42-T from Maxim Integrated is a low-noise, low-dropout linear regulator with 4.2V preset output, 150mA maximum output current, 165mV dropout at full load, 30µVRMS output noise, and 100µA operating supply current. It serves as a primary voltage regulator in battery-powered portable electronics requiring stable, low-noise power for analog or RF circuitry.
For engineers reviewing the MAX8877EUK42-T datasheet, MAX8877EUK42-T pinout, MAX8877EUK42-T application, or MAX8877EUK42-T equivalent, key selection criteria include dropout performance at 150mA, shutdown current (10nA), reverse battery protection, thermal shutdown behavior, and BP-capacitor–dependent noise reduction.
Technical Context
The MAX8877EUK42-T uses an internal P-channel MOSFET pass transistor to achieve 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, enabling precise regulation without external resistors.
It integrates reverse battery protection that limits reverse supply current to 1mA when VIN or SHDN falls below ground, plus thermal shutdown at +155°C with 15°C hysteresis. The BP pin accepts a 0.01µF ceramic capacitor to form an 80Hz low-pass filter, reducing output noise to 30µVRMS (10Hz–100kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.2V ±1.4% (factory-preset; no external feedback required) |
| Max Output Current | 150mA (supports moderate-power microcontrollers and sensors) |
| Dropout Voltage | 165mV at 150mA (enables operation down to VIN = 4.365V for 4.2V output) |
| Output Noise | 30µVRMS (10Hz–100kHz, with 0.01µF BP cap; suitable for RF/ADC supplies) |
| Quiescent Current | 100µA (constant across load and dropout; extends battery life) |
| Shutdown Current | 10nA (logic-controlled active-low SHDN; enables ultra-low-power sleep modes) |
| Input Voltage Range | 2.5V to 6.5V (compatible with single Li-ion, dual Alkaline, or regulated DC sources) |
| Protection Features | Thermal shutdown (+155°C), short-circuit limit (160–390mA), reverse battery protection (≤1mA reverse current) |
Pinout & Package
MAX8877EUK42-T is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with exposed pad not electrically connected. The GND pin serves as both circuit return and thermal path-requires soldering to a large copper area for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input supply | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND for stability and line rejection |
| 2 GND | Ground reference and thermal sink | Electrical return path; must connect to large PCB copper area to dissipate heat and maintain <150°C junction temp |
| 3 SHDN | Active-low shutdown control | Pulls to GND to enter 10nA shutdown; on MAX8877 (not MAX8878), no auto-discharge function |
| 4 BP | Bypass capacitor connection | Connects to internal 200kΩ resistor forming 80Hz LPF; 0.01µF ceramic cap reduces output noise to 30µVRMS |
| 5 OUT | Regulated output | Delivers up to 150mA at 4.2V; requires ≥1µF (ESR <0.2Ω) ceramic cap for VOUT ≥2.5V |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current; maintains 100µA IQ across all load and dropout conditions |
| Factory-preset 4.2V output | ±1.4% accuracy over -40°C to +85°C; eliminates external resistor network and layout sensitivity |
| Reverse battery protection | Blocks >1mA reverse current when VIN or SHDN < GND; prevents damage in miswired battery compartments |
| Thermal shutdown with hysteresis | Shuts down at +155°C; restarts only after cooling by 15°C-prevents thermal oscillation during sustained overload |
| Low-noise BP filtering | 0.01µF capacitor at BP pin reduces broadband output noise to 30µVRMS without compromising start-up time |
| Industry-standard '2982 pinout | Direct replacement for legacy regulators in existing SOT23-5 layouts; no PCB redesign required |
Applications
| Cellular Handset Power | PCMCIA Card Regulation |
|---|---|
Use Scenario: Supplying 4.2V rail to RF transceiver and baseband processor in GSM/UMTS handsets with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 4.2V power; replaces switching converter output to reduce EMI near sensitive RF sections. Use Value: 30µVRMS noise ensures minimal phase noise degradation in VCOs; 165mV dropout extends usable battery life to ~3.8V cutoff. | Use Scenario: Providing regulated 4.2V to PCMCIA card logic and interface circuitry in laptop expansion slots. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating card circuitry from noisy host system rails. Use Value: Reverse battery protection prevents damage during hot-swap insertion; 10nA shutdown enables zero-power state when card is ejected. |
| Hand-Held Instrument Supply | Palmtop Computer Core Rail |
Use Scenario: Powering precision ADC front-end and microcontroller in portable multimeters or data loggers. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from digital switching noise. Use Value: 30µVRMS noise contributes <0.01% error in 16-bit ADC measurements; 100µA IQ supports multi-week battery life in sleep mode. | Use Scenario: Delivering 4.2V core voltage to ARM-based application processor and SRAM in palmtop PDAs. IC Role / Device Role / Timing Role: Main system regulator supporting dynamic voltage scaling and deep-sleep states. Use Value: 10nA shutdown current enables real-time clock and memory retention during extended standby; thermal shutdown protects against enclosure overheating. |
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 |
|---|---|---|---|
| TPS76342DBVR | 4.2V fixed output, 150mA, 220mV dropout at 150mA, 35µVRMS noise, 85µA IQ | Higher dropout reduces usable battery range; slightly higher noise affects RF-sensitive designs | Preferred where TI supply chain preference exists and marginally higher dropout is acceptable |
| MCP1703T-4202E/MB | 4.2V fixed output, 250mA, 600mV dropout at 250mA, 40µVRMS noise, 4µA IQ | Lower IQ benefits ultra-long-life applications; higher dropout and noise limit use in RF/analog circuits | Best for cost-sensitive, low-power MCU-only systems where noise and dropout are secondary |
Compared with TPS76342DBVR and MCP1703T-4202E/MB, the MAX8877EUK42-T delivers superior noise performance (30µVRMS vs. ≥35µVRMS) and lower dropout (165mV vs. ≥220mV), making it optimal for RF and precision analog loads-while maintaining competitive quiescent current and integrated protection features.
Availability
MAX8877EUK42-T is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, hand-held instruments, and palmtop computers requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance over -40°C to +85°C.
Supply support for MAX8877EUK42-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 MAX8877/MAX8878 product line was designed specifically for battery-powered portable electronics needing ultra-low-noise, low-quiescent-current regulation with robust protection-targeting cellular handsets, PCMCIA, and handheld instrumentation markets.
FAQ
What is the exact output voltage tolerance of the MAX8877EUK42-T over temperature?
The MAX8877EUK42-T has a factory-preset output voltage of 4.2V with ±1.4% accuracy across the full operating temperature range of -40°C to +85°C, as specified in the Electrical Characteristics table under "Output Voltage Accuracy" for loads from 0.1mA to 120mA. This tolerance includes initial calibration, line/load regulation, and thermal drift-no additional external trimming is required or supported.
Does the MAX8877EUK42-T include auto-discharge functionality during shutdown?
No, the MAX8877EUK42-T does not include auto-discharge functionality. That feature is exclusive to the MAX8878 family (e.g., MAX8878EUK42-T). When the MAX8877EUK42-T enters shutdown via the SHDN pin, the output remains floating at its last regulated voltage; external discharge circuitry is required if rapid output decay is needed.
What capacitor values are required for stable operation of the MAX8877EUK42-T?
For stable operation, the MAX8877EUK42-T requires a minimum 1µF ceramic input capacitor (X5R/X7R dielectric) and a minimum 1µF ceramic output capacitor with ESR <0.2Ω for VOUT ≥2.5V (which applies to the 4.2V output). A 0.01µF ceramic capacitor must be placed directly at the BP pin. Larger output capacitance (e.g., 3.3µF–10µF) improves transient response and PSRR but is not mandatory for stability.
How does reverse battery protection work in the MAX8877EUK42-T?
The MAX8877EUK42-T monitors polarity at both the IN and SHDN pins. If either pin falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to ≤1mA-preventing damage during incorrect battery installation. This protection operates independently of device enable state and requires no external components.
Is the MAX8877EUK42-T pin-compatible with the industry-standard '2982 regulator?
Yes, the MAX8877EUK42-T is explicitly designed as a pin-compatible upgrade to the industry-standard '2982 series in the same SOT23-5 package. Pin assignments (IN, GND, SHDN, BP, OUT) match exactly, enabling drop-in replacement without PCB modification-while offering improved dropout voltage, lower noise, and enhanced protection features.
MAX8877EUK42-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):
- 4.2V
- 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
MAX8877EUK42-T FAQ
1.How can I place an order for MAX8877EUK42-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8877EUK42-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 MAX8877EUK42-T reliable?
The price and inventory of MAX8877EUK42-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8877EUK42-T is usually 5 days.
3.What payment methods are accepted for MAX8877EUK42-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8877EUK42-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8877EUK42-T?
MAX8877EUK42-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8877EUK42-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 MAX8877EUK42-T?
For technical support, including MAX8877EUK42-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8877EUK42-T requirements.
6.How does Aetrix verify that MAX8877EUK42-T is sourced from the original manufacturer or authorized distributors?
All MAX8877EUK42-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 MAX8877EUK42-T meets industry standards.
7.What is the process for return or replacement of MAX8877EUK42-T?
All MAX8877EUK42-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8877EUK42-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 MAX8877EUK42-T part is unused and in its original packaging.
Return procedure for MAX8877EUK42-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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