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Analog Devices Inc./Maxim Integrated MAX8878EUK50+T
- Part No.:
- MAX8878EUK50+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8878EUK50+T.pdf
- Description:
- IC REG LINEAR 5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,485
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Product details
Overview
MAX8878EUK50+T 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. Designed for battery-powered portable electronics requiring stable, quiet voltage regulation.
For engineers reviewing the MAX8878EUK50+T datasheet, MAX8878EUK50+T pinout, MAX8878EUK50+T application, or MAX8878EUK50+T equivalent, key selection criteria include its auto-discharge function, ±1.4% output accuracy over temperature, reverse battery protection, and SOT23-5 regular package compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8878EUK50+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling low quiescent current across all operating conditions-including dropout-without base-drive losses. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
It integrates logic-controlled shutdown (10nA ISHDN), thermal shutdown at +155°C with 15°C hysteresis, short-circuit protection, and-uniquely versus MAX8877-a dedicated auto-discharge circuit (300Ω discharge path) that actively pulls OUT to GND during shutdown. The BP pin accepts a 0.01µF ceramic capacitor to form an 80Hz low-pass filter reducing reference noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.4% over -40°C to +85°C; enables direct replacement of 5V logic rails without external feedback. |
| Max Output Current | 150mA continuous; supports microcontrollers, RF front-ends, and sensor interfaces in space-constrained portable designs. |
| Dropout Voltage | 165mV at 150mA; allows operation down to VIN = 5.165V, extending usable battery life in single-cell Li-ion or dual-cell alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz); sufficiently low for analog signal chains, ADC references, and RF power amplifiers. |
| Quiescent Current | 100µA at full load and in dropout; ensures minimal standby drain in always-on subsystems like real-time clocks or wake-up controllers. |
| Shutdown Current | 10nA typical; reduces system-level leakage during deep sleep modes in handheld instruments and modems. |
| Auto-Discharge | Active 300Ω discharge path on OUT during SHDN; eliminates residual voltage hold-up, critical for safe hot-swap or reset sequencing. |
Pinout & Package
MAX8878EUK50+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 electrical return and primary thermal path; soldering to a large PCB copper area is required for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND near pin for stability and line-transient suppression. |
| 2 - GND | Ground reference and thermal sink | Must be connected to large PCB ground plane; directly impacts thermal resistance (θJB = 140°C/W) and maximum power dissipation. |
| 3 - SHDN | Active-low enable/disable control | Pulled low disables regulator and triggers auto-discharge; pulled high (≥2.0V) enables operation; 0.4V max threshold ensures TTL/CMOS compatibility. |
| 4 - BP | Bypass node for reference noise filtering | Connects to 0.01µF ceramic capacitor; forms RC filter with internal 200kΩ resistor to suppress 1.25V reference noise before error amplifier. |
| 5 - OUT | Regulated output terminal | Delivers 5.0V at up to 150mA; requires ≥1µF ceramic capacitor (ESR < 0.2Ω) for stability; auto-discharged to GND when SHDN is asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | 300Ω active discharge path on OUT during shutdown-eliminates need for external bleed resistors in reset-critical applications. |
| Reverse battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND-prevents damage during incorrect battery insertion in consumer handsets. |
| P-channel MOSFET pass element | 1.1Ω typical RDS(ON) enables 100µA IQ independent of load or dropout-extends battery runtime vs. PNP-based LDOs. |
| Thermal shutdown with hysteresis | +155°C trip with +15°C hysteresis-enables self-recovering fault response during sustained overload without latch-up. |
| Low-noise BP pin architecture | 0.01µF BP capacitor reduces output noise to 30µVRMS-meets stringent noise requirements for precision analog and RF ICs. |
Applications
| Cellular Telephones | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering baseband processor core voltage and SIM interface in GSM/CDMA handsets with single Li-ion cell. IC Role / Device Role / Timing Role: Primary 5V LDO supplying clean, regulated voltage to digital logic and communication peripherals. Use Value: 165mV dropout extends usable battery range to ~5.165V; auto-discharge ensures rapid, deterministic power-down during call termination. |
Use Scenario: Providing isolated 5V rail for PCMCIA card controller and memory interface in laptop expansion slots. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling host bus noise and enabling hot-plug compliance. Use Value: 30µVRMS noise prevents data corruption in high-speed memory transfers; reverse battery protection safeguards against misinsertion. |
| Modems | Hand-Held Instruments |
|
Use Scenario: Regulating 5V supply for V.34/V.90 analog front-end and DSP in embedded dial-up/fax modems. IC Role / Device Role / Timing Role: Low-noise analog supply rail ensuring SNR integrity in audio-band signal processing. Use Value: BP-filtered reference noise minimizes spurious tones in modem line drivers; 10nA shutdown current preserves backup battery life. |
Use Scenario: Powering microcontroller, LCD driver, and sensor signal chain in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Main system regulator supporting mixed-signal operation with tight voltage tolerance. Use Value: ±1.4% output accuracy maintains ADC reference stability across temperature; thermal shutdown prevents overheating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, 5V LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8877EUK50+T | No auto-discharge; identical pinout, specs, and package-but OUT remains floating in shutdown. | Suitable where residual output voltage is acceptable (e.g., non-reset-critical logic rails). | Select MAX8878EUK50+T when active discharge is required for safe reset or hot-swap; choose MAX8877EUK50+T for cost-sensitive, non-discharge applications. |
| MCP1700T-5002E/TT | Higher 170mV dropout at 250mA; no BP pin or auto-discharge; 2.3µA quiescent current but no reverse battery protection. | Targeted at ultra-low-IQ applications where noise <30µVRMS is not required. | Prefer MAX8878EUK50+T for battery-powered systems needing low noise, reverse protection, and controlled shutdown discharge. |
Compared with MAX8877EUK50+T and MCP1700T-5002E/TT, the MAX8878EUK50+T uniquely combines 5V regulation, 30µVRMS noise, reverse battery protection, and active output discharge-making it optimal for safety- and noise-critical portable designs where predictable shutdown behavior is mandatory.
Availability
MAX8878EUK50+T is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, modems, and hand-held instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8878EUK50+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 demanding ultra-low noise, low dropout, and robust protection features in miniature SOT23 packages.
FAQ
What is the output voltage tolerance of the MAX8878EUK50+T over temperature?
The MAX8878EUK50+T guarantees ±1.4% output voltage accuracy across the full operating temperature range of -40°C to +85°C. This specification is confirmed in the Electrical Characteristics table under "Output Voltage Accuracy" with test conditions covering IOUT = 0.1mA to 120mA and all output voltages ≥2.5V. At +25°C, typical deviation is tighter, but design margin must be based on the worst-case ±1.4% limit for reliable 5.0V rail operation.
Does the MAX8878EUK50+T require an external BP capacitor, and what value is recommended?
Yes, the MAX8878EUK50+T requires a 0.01µF ceramic capacitor between the BP pin and GND to achieve its specified 30µVRMS output noise. This capacitor forms a low-pass filter with an internal 200kΩ resistor, suppressing reference noise before the error amplifier. Values above 0.1µF increase startup time without meaningful noise reduction and are not recommended per the datasheet's Shutdown Exit Delay graphs.
How does the auto-discharge function operate in the MAX8878EUK50+T?
When the SHDN pin is driven low, the MAX8878EUK50+T activates an internal 300Ω discharge path between the OUT pin and GND. This actively pulls the output voltage to ground within microseconds-unlike passive discharge via load leakage. The feature is exclusive to the MAX8878 family (not present in MAX8877) and eliminates residual voltage that could interfere with system reset or hot-swap sequencing.
What thermal considerations apply to the MAX8878EUK50+T in SOT23-5 regular package?
The MAX8878EUK50+T in SOT23-5 regular has a junction-to-board thermal resistance (θJB) of 140°C/W. To maintain TJ ≤ +150°C, the GND pin must be soldered to a large PCB copper area acting as a heatsink. Continuous power dissipation is limited to 571mW at +70°C ambient, derating by 7.1mW/°C above that. Exceeding thermal limits triggers +155°C shutdown with 15°C hysteresis.
Is the MAX8878EUK50+T pin-compatible with the industry-standard '2982 regulator?
Yes, the MAX8878EUK50+T is explicitly designed as a pin-compatible upgrade to the industry-standard µA78Lxx and MC78Lxx series (collectively referenced as '2982). Pin assignments-IN, GND, SHDN, BP, OUT-match the standard 5-pin SOT23 layout, enabling drop-in replacement while improving dropout voltage, noise, and adding auto-discharge and reverse battery protection not found in legacy parts.
MAX8878EUK50+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- 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
MAX8878EUK50+T FAQ
1.How can I place an order for MAX8878EUK50+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EUK50+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 MAX8878EUK50+T reliable?
The price and inventory of MAX8878EUK50+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EUK50+T is usually 5 days.
3.What payment methods are accepted for MAX8878EUK50+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EUK50+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EUK50+T?
MAX8878EUK50+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EUK50+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 MAX8878EUK50+T?
For technical support, including MAX8878EUK50+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EUK50+T requirements.
6.How does Aetrix verify that MAX8878EUK50+T is sourced from the original manufacturer or authorized distributors?
All MAX8878EUK50+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 MAX8878EUK50+T meets industry standards.
7.What is the process for return or replacement of MAX8878EUK50+T?
All MAX8878EUK50+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EUK50+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 MAX8878EUK50+T part is unused and in its original packaging.
Return procedure for MAX8878EUK50+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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