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Analog Devices Inc./Maxim Integrated MAX8877EUK50
- Part No.:
- MAX8877EUK50
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8877EUK50.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:10,176
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Product details
Overview
MAX8877EUK50 from Maxim Integrated is a low-noise, low-dropout linear regulator with fixed 5.0V output, delivering up to 150mA from a 2.5V–6.5V input. It features 30µVRMS output noise, 165mV dropout at 150mA, and 100µA operating supply current independent of load or dropout condition. It is used in battery-powered handheld instruments requiring stable, ultra-low-noise 5V rail generation.
For engineers reviewing the MAX8877EUK50 datasheet, MAX8877EUK50 pinout, MAX8877EUK50 application, or MAX8877EUK50 equivalent, this page delivers verified electrical parameters, SOT23-5 terminal mapping, thermal and short-circuit protection behavior, and real-world selection guidance for portable power management designs.
Technical Context
The MAX8877EUK50 uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) to achieve low dropout and eliminate base-drive current loss. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
It integrates reverse-battery protection (limits reverse current to 1mA), thermal shutdown at +155°C with 15°C hysteresis, and a 10nA logic-controlled shutdown mode. 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 performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.4% over -40°C to +85°C - ensures stable logic-level supply for microcontrollers and analog circuitry without external feedback. |
| Max Output Current | 150mA continuous - sufficient to power core logic, sensors, and RF front-ends in compact portable devices. |
| Dropout Voltage | 165mV at 150mA - enables operation down to 5.165V input, extending usable battery life in single-cell Li-ion or dual-cell alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) with 0.01µF BP cap - low enough to avoid interference in ADC references, PLLs, and audio signal chains. |
| Quiescent Current | 100µA across full load and dropout range - preserves battery runtime during standby and light-load operation. |
| Shutdown Current | 10nA typical - reduces system leakage to negligible levels during deep sleep modes. |
| Thermal Protection | Shuts down at +155°C with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
MAX8877EUK50 is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical return and thermal path. The package supports standard reflow and is compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND for stability and line-transient immunity. |
| 2 - GND | Ground reference and thermal sink | Must be connected to large copper area or ground plane to maintain junction temperature below +150°C under full load. |
| 3 - SHDN | Active-low enable control | Pulled low to enter 10nA shutdown; pulled high (≥2.0V) to enable regulation; no auto-discharge (MAX8878 feature only). |
| 4 - BP | Bypass for internal reference | Connects to 0.01µF low-leakage ceramic capacitor to reduce output noise by filtering reference voltage ripple. |
| 5 - OUT | Regulated 5.0V output | Sources up to 150mA; requires ≥1µF ceramic capacitor (ESR <0.2Ω) for stability with VOUT ≥2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss, enabling constant 100µA IQ across all load and dropout conditions - critical for battery longevity. |
| Reverse battery protection | Clamps reverse current to ≤1mA when VIN or SHDN falls below GND - prevents damage in miswired or hot-swap battery scenarios. |
| Internal current limiting | Guarantees minimum 160mA current limit (typical 390mA) - allows safe indefinite short-circuit operation without latch-up or thermal runaway. |
| Low-noise BP pin architecture | Combines internal 200kΩ resistor with external 0.01µF capacitor to create 80Hz reference filter - achieves 30µVRMS noise without complex external circuitry. |
| Thermal shutdown with hysteresis | Turns off pass transistor at +155°C and re-enables only after cooling to +140°C - provides self-recovering fault protection during transient overloads. |
Applications
| Hand-Held Instruments | Palmtop Computers |
|---|---|
|
Use Scenario: Portable multimeters and data loggers powered by two AA/AAA cells or single Li-ion battery. IC Role / Device Role / Timing Role: Primary 5.0V LDO supplying microcontroller, display driver, and precision ADC reference. Use Value: 30µVRMS noise avoids digitization errors; 165mV dropout extends measurement runtime until battery reaches 5.165V. |
Use Scenario: Compact computing devices with integrated LCD, flash memory, and serial interfaces. IC Role / Device Role / Timing Role: Fixed 5.0V rail generator for USB-peripheral interface ICs and SRAM I/O buffers. Use Value: 100µA quiescent current minimizes standby drain; SOT23-5 footprint enables dense layout in space-constrained clamshell designs. |
| Electronic Planners | PCMCIA Cards |
|
Use Scenario: Battery-backed organizers with real-time clock, touch screen, and IR transceiver. IC Role / Device Role / Timing Role: Low-noise 5.0V source for RTC crystal oscillator buffer and capacitive touch controller analog front-end. Use Value: Reverse battery protection prevents damage during user battery replacement; thermal shutdown guards against enclosure overheating. |
Use Scenario: Hot-pluggable PC Card peripherals such as modems or network adapters. IC Role / Device Role / Timing Role: Local 5.0V regulator isolating card logic from host bus voltage variations and noise. Use Value: Pin compatibility with industry-standard '2982 simplifies legacy design migration; 150mA output supports dual-interface (serial + parallel) implementations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76350DBVR | Higher 220mV dropout at 150mA; 50µVRMS noise; 85µA IQ; no reverse-battery protection. | Lacks reverse-polarity hardening - unsuitable for field-replaceable battery compartments without external diode. | Choose if lower cost and TI supply-chain alignment outweigh noise and protection trade-offs. |
| MCP1700T-5002E/TT | 175mV dropout at 250mA; 35µVRMS noise; 1.6µA IQ; no thermal shutdown or current limit. | No built-in fault protection - requires external thermal monitoring and current sense for robustness. | Prefer for ultra-low-IQ applications where peak load is <100mA and board-level protection exists. |
Compared with TPS76350DBVR and MCP1700T-5002E/TT, the MAX8877EUK50 uniquely combines ultra-low noise (30µVRMS), reverse-battery protection, thermal shutdown, and consistent 100µA IQ - making it optimal for unattended, battery-critical portable instrumentation.
Availability
MAX8877EUK50 is available at Aetrix Electronics and suitable for hand-held instruments, palmtop computers, electronic planners, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for MAX8877EUK50 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 demanding industrial and portable applications.
The MAX8877/MAX8878 family was designed specifically for battery-powered handheld equipment needing ultra-low-noise, low-quiescent-current, and fault-protected 5V/3.3V/2.5V rails - with emphasis on drop-in compatibility and thermal resilience.
FAQ
What is the output voltage tolerance of the MAX8877EUK50 over temperature and load?
The MAX8877EUK50 guarantees ±1.4% output voltage accuracy across -40°C to +85°C and 0.1mA–120mA load range for VOUT ≥2.5V. At +25°C and 0.1mA load, tolerance tightens to ±1.4% (not ±1%). This specification ensures reliable logic-level compatibility with 5V-tolerant microcontrollers and interface ICs without external trimming.
Does the MAX8877EUK50 include auto-discharge functionality during shutdown?
No, the MAX8877EUK50 does not include auto-discharge. That feature is exclusive to the MAX8878 variant (e.g., MAX8878EUK50). When the MAX8877EUK50 enters shutdown via the SHDN pin, the output remains floating at its last regulated voltage; external discharge circuitry is required if rapid VOUT decay is needed.
What capacitor values are required for stable operation of the MAX8877EUK50?
For stable operation, the MAX8877EUK50 requires a minimum 1µF ceramic capacitor (ESR <0.2Ω) on the OUT pin and a 1µF ceramic capacitor on the IN pin. For VOUT = 5.0V (≥2.5V), 1µF suffices; for lower outputs, 3.3µF is recommended. A 0.01µF ceramic capacitor must be placed on the BP pin to achieve specified 30µVRMS noise performance.
Can the MAX8877EUK50 operate with a 2.5V input while regulating 5.0V output?
No - the MAX8877EUK50 cannot regulate 5.0V output from a 2.5V input. Its minimum input voltage is defined as VOUT + dropout voltage. With 5.0V output and 165mV dropout at full load, the absolute minimum input is 5.165V. The 2.5V–6.5V input range applies only to versions with VOUT ≤2.5V (e.g., MAX8877EUK25).
How does the MAX8877EUK50 handle thermal overload conditions?
When the MAX8877EUK50 junction temperature exceeds +155°C, its internal thermal sensor triggers shutdown, turning off the pass transistor. After cooling by 15°C (to +140°C), regulation automatically resumes. This pulsed operation prevents permanent damage but indicates inadequate PCB thermal design or excessive power dissipation - verify θJA and copper area per the datasheet's derating curves.
MAX8877EUK50 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):
- 5V
- 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
MAX8877EUK50 FAQ
1.How can I place an order for MAX8877EUK50 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8877EUK50 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 MAX8877EUK50 reliable?
The price and inventory of MAX8877EUK50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8877EUK50 is usually 5 days.
3.What payment methods are accepted for MAX8877EUK50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8877EUK50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8877EUK50?
MAX8877EUK50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8877EUK50 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 MAX8877EUK50?
For technical support, including MAX8877EUK50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8877EUK50 requirements.
6.How does Aetrix verify that MAX8877EUK50 is sourced from the original manufacturer or authorized distributors?
All MAX8877EUK50 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 MAX8877EUK50 meets industry standards.
7.What is the process for return or replacement of MAX8877EUK50?
All MAX8877EUK50 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8877EUK50, 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 MAX8877EUK50 part is unused and in its original packaging.
Return procedure for MAX8877EUK50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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