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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 4.2V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,543
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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 voltage, 150mA maximum output current, 165mV dropout at full load, 30µVRMS output noise, and 100µA operating supply current. It employs an internal P-channel MOSFET pass transistor and operates from 2.5V to 6.5V input, targeting battery-powered handheld instruments and portable communication devices.
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 a 1.25V bandgap reference and error amplifier to regulate output via an internal P-channel MOSFET pass transistor with ~1.1Ω RDS(ON). Its feedback network is fully internal, eliminating external resistor networks and enabling fixed 4.2V output with ±1.4% accuracy across temperature and load.
It integrates logic-controlled active-low shutdown (SHDN), reverse-battery protection limiting reverse current to 1mA, thermal shutdown at +155°C with 15°C hysteresis, and current limiting set to 160mA (min) to 390mA (max). The BP pin accepts a 0.01µF ceramic capacitor to form an 80Hz low-pass filter that reduces reference noise, directly enabling its 30µVRMS output noise specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.2V preset (±1.4% over -40°C to +85°C); eliminates need for external feedback resistors. |
| Max Output Current | 150mA continuous; supports power rails for microcontrollers and RF front-ends in portable systems. |
| Dropout Voltage | 165mV at 150mA; enables operation down to 4.365V input when regulating 4.2V - critical for Li-ion end-of-discharge voltage utilization. |
| Output Noise | 30µVRMS (10Hz–100kHz); achieved with 0.01µF BP capacitor - suitable for noise-sensitive analog/RF circuitry. |
| Quiescent Current | 100µA over full load and dropout range; ensures minimal battery drain during active operation. |
| Shutdown Current | 10nA typical; reduces system standby power to negligible levels in always-on portable devices. |
| Input Voltage Range | 2.5V to 6.5V; compatible with single-cell Li-ion (2.7–4.2V), dual-cell alkaline (up to 3.2V), and regulated 5V supplies. |
Pinout & Package
SOT23-5 regular package (5-pin, surface-mount, JEDEC MO-178AA compliant); GND pin serves as electrical ground and primary thermal path - requires soldering to large copper area for thermal management.
| 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-transient suppression. |
| 2 - GND | Ground reference and thermal sink | Electrical return path and primary heat conduction route; must connect to large PCB copper area for thermal reliability. |
| 3 - SHDN | Active-low shutdown control | Pulls to GND to enter 10nA shutdown; on MAX8877 (not MAX8878), no auto-discharge - output remains floating. |
| 4 - BP | Bypass for internal reference | Connects 0.01µF ceramic capacitor to reduce reference noise; determines output noise floor and startup time. |
| 5 - OUT | Regulated output | Delivers up to 150mA at 4.2V; requires ≥1µF (ESR < 0.2Ω) ceramic capacitor for VOUT ≥ 2.5V stability. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss; maintains 100µA quiescent current regardless of load or dropout condition. |
| Reverse battery protection | Clamps reverse supply current to ≤1mA if VIN or SHDN falls below GND - prevents damage in miswired battery compartments. |
| Thermal shutdown with hysteresis | Shuts down at +155°C and re-enables only after cooling by 15°C - avoids oscillation during sustained overload. |
| Internal feedback divider | Enables factory-preset 4.2V output with no external components - reduces BOM count and layout area in space-constrained designs. |
| Low-noise BP filtering | 0.01µF capacitor at BP forms 80Hz RC filter on reference node - achieves 30µVRMS noise without requiring LDO post-regulation. |
Applications
| Hand-Held Instruments | Cellular Telephones |
|---|---|
|
Use Scenario: Portable multimeter or data logger powered by single Li-ion cell with dynamic load switching between ADC, display, and wireless transceiver. IC Role / Device Role / Timing Role: Primary 4.2V rail regulator supplying precision analog front-end and low-power MCU core. Use Value: 165mV dropout extends usable battery life by enabling regulation until cell voltage drops to 4.365V; 30µVRMS noise avoids ADC quantization errors. |
Use Scenario: Power management for baseband processor and PMIC interface in GSM/EDGE handset with tight PCB area constraints. IC Role / Device Role / Timing Role: Standby-mode LDO delivering clean 4.2V to real-time clock and memory retention circuits. Use Value: 10nA shutdown current minimizes battery drain during sleep; SOT23-5 footprint fits alongside high-density RF modules. |
| PCMCIA Cards | Electronic Planners |
|
Use Scenario: Hot-pluggable PCMCIA modem card drawing burst current up to 120mA while maintaining stable 4.2V for UART and PHY ICs. IC Role / Device Role / Timing Role: Input-stage LDO isolating host 5V bus from card's internal 4.2V domain with reverse polarity protection. Use Value: Reverse battery protection prevents latch-up during insertion/removal; 1.1Ω RDS(ON) limits voltage drop under transient load. |
Use Scenario: Powering LCD controller and flash memory in palm-sized organizer with coin-cell backup and main Li-ion primary. IC Role / Device Role / Timing Role: Main 4.2V regulator supporting simultaneous display refresh and data logging operations. Use Value: 100µA quiescent current preserves runtime during idle periods; ±1.4% output accuracy ensures consistent LCD contrast and memory write margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, low-dropout LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76342DBVR | 4.2V fixed output, 150mA, 250mV dropout at 150mA, 35µVRMS noise, 85µA IQ, SOT23-5 | Higher dropout reduces usable battery range; lacks reverse battery protection | Choose when lower quiescent current is prioritized over dropout and reverse-polarity robustness. |
| MCP1703T-4202E/MB | 4.2V fixed output, 250mA, 600mV dropout at 250mA, 45µVRMS noise, 4µA IQ, SOT23-5 | Higher dropout and noise; ultra-low IQ suits long-term battery-only operation, not high-current bursts | Prefer for energy-harvesting or coin-cell–powered devices where peak current < 50mA and dropout is non-critical. |
Compared with TPS76342DBVR and MCP1703T-4202E/MB, the MAX8877EUK42+T delivers superior dropout performance (165mV vs. ≥250mV) and integrated reverse-battery protection - making it uniquely suited for consumer handhelds with exposed battery contacts and aggressive battery utilization requirements.
Availability
MAX8877EUK42+T is available at Aetrix Electronics and suitable for cellular telephones, hand-held instruments, PCMCIA cards, and electronic planners requiring stable component supply, long-lifecycle support, and guaranteed traceability for industrial and consumer OEM programs.
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 requiring ultra-low noise, low dropout, and robust protection features - targeting space-constrained, cost-sensitive, and reliability-critical handheld platforms.
FAQ
What is the output voltage tolerance of the MAX8877EUK42+T over temperature and load?
The MAX8877EUK42+T guarantees ±1.4% output voltage accuracy across -40°C to +85°C ambient temperature and 0.1mA to 120mA load current for 4.2V output. This specification is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy" and applies to both regular and thin SOT23-5 packages.
Does the MAX8877EUK42+T include reverse battery protection?
Yes, the MAX8877EUK42+T includes integrated reverse battery protection that limits reverse current to ≤1mA when either IN or SHDN falls below GND. This feature is explicitly documented in the Absolute Maximum Ratings and Detailed Description sections, and distinguishes it from many competing LDOs lacking this safeguard.
What capacitor values are required for stable operation of the MAX8877EUK42+T?
For stable operation, the MAX8877EUK42+T requires a minimum 1µF ceramic capacitor (ESR < 0.2Ω) on OUT for 4.2V output, and a 1µF capacitor on IN. A 0.01µF ceramic capacitor is mandatory on BP to achieve the specified 30µVRMS noise. These values are validated across -40°C to +85°C per the Applications Information section.
How does the MAX8877EUK42+T behave during thermal overload?
When junction temperature exceeds +155°C, the MAX8877EUK42+T activates thermal shutdown, turning off the pass transistor. It remains off until junction temperature cools by 15°C, then resumes regulation. This hysteresis prevents oscillation and is verified in the Thermal Protection section of the Electrical Characteristics table.
Is the MAX8877EUK42+T pin-compatible with the industry-standard '2982 regulator?
Yes, the MAX8877EUK42+T is explicitly pin-compatible with the industry-standard µA78Lxx and MC78Lxx series (collectively referenced as '2982 in the datasheet). Pin mapping (IN, GND, SHDN, BP, OUT) matches the standard 5-pin SOT23-5 configuration used by those legacy regulators.
MAX8877EUK42+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Product Status:
- Obsolete
- 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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