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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 LDO
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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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, it integrates reverse-battery protection, thermal shutdown, short-circuit protection, and auto-discharge functionality.
For engineers reviewing the MAX8878EUK50-T datasheet, MAX8878EUK50-T pinout, MAX8878EUK50-T application, or MAX8878EUK50-T equivalent, key selection criteria include its SOT23-5 regular package, 5.0V ±1.4% output accuracy, 10nA logic-controlled shutdown, and auto-discharge capability-critical for power-sensitive handheld and communication devices.
Technical Context
The MAX8878EUK50-T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current (100µA) across all operating conditions-including dropout-and eliminating base-drive losses inherent in PNP-based regulators. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
It incorporates dedicated circuitry for auto-discharge (exclusive to MAX8878 variants), where a logic-low SHDN actively pulls OUT to GND via a 300Ω internal discharge path. Noise reduction is achieved via a BP pin with external 0.01µF capacitor forming an 80Hz low-pass filter, yielding 30µVRMS (10Hz–100kHz) output noise with COUT = 10µF.
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 microcontroller cores, RF front-ends, and sensor interfaces in compact portable systems. |
| Dropout Voltage | 165mV at 150mA; allows operation down to 5.165V input when regulating 5.0V-extending usable battery life in single-cell Li-ion or multi-cell alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz); sufficiently low for noise-sensitive analog circuits like ADC references or RF synthesizers. |
| Quiescent Current | 100µA at full load and in dropout; ensures minimal standby drain during light-load or partial-load operation. |
| Shutdown Current | 10nA typical; reduces system leakage to negligible levels during deep sleep modes. |
| Auto-Discharge | 300Ω internal discharge path on SHDN assert; clears output capacitance rapidly-preventing unintended wake-up or latch-up in sequenced power-down systems. |
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 dual function as electrical ground 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-transient suppression. |
| 2 GND | Ground reference and thermal sink | Must connect to PCB ground plane or large thermal pad; critical for thermal dissipation and noise immunity. |
| 3 SHDN | Active-low enable/disable control | Logic-low (<0.4V) disables regulation and triggers auto-discharge; logic-high (>2.0V) enables normal operation. |
| 4 BP | Bypass for reference noise reduction | Connects to 0.01µF ceramic capacitor; forms 80Hz RC filter to suppress reference noise before error amplifier. |
| 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 | 1.1Ω typical RDS(ON); eliminates base-drive current, enabling constant 100µA IQ regardless of load or dropout state. |
| Auto-discharge function | 300Ω internal discharge path activated on SHDN assert; discharges output capacitance without external components-essential for controlled power sequencing. |
| Reverse battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND; prevents damage during incorrect battery insertion in consumer handhelds. |
| Thermal shutdown with hysteresis | Triggers at +155°C junction temperature with +15°C hysteresis; provides self-recovering fault protection during sustained overload or poor heatsinking. |
| Low-noise BP pin architecture | Internal 200kΩ resistor + external 0.01µF capacitor creates dedicated 80Hz noise filter for reference; isolates error amplifier from supply noise. |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering baseband processor I/O banks and RF transceiver bias rails in GSM/UMTS handsets with single-cell Li-ion battery (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary 5.0V LDO supplying noise-sensitive analog sections; maintains stable rail during burst-mode transmission. Use Value: 30µVRMS noise and 165mV dropout ensure clean power delivery even as battery voltage drops near end-of-life, preventing data corruption or RF desense. |
Use Scenario: Providing regulated 5.0V to PCMCIA card controllers and interface logic in laptop expansion slots. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling host bus voltage; enables hot-plug compatibility and fast power-up sequencing. Use Value: 10nA shutdown current and auto-discharge prevent backfeeding into host when card is ejected, meeting PCMCIA 2.1 power management requirements. |
| Modems | Hand-Held Instruments |
|
Use Scenario: Supplying isolated 5.0V to modem DSP, line-driver, and analog front-end in embedded dial-up or DSL modems. IC Role / Device Role / Timing Role: Low-noise post-regulator after DC-DC converter; rejects switching noise from upstream buck stage. Use Value: 63dB PSRR at low frequencies and BP-filtered reference suppress ripple from switching supplies-ensuring clean ADC sampling and low BER. |
Use Scenario: Powering precision op-amps, LCD bias, and microcontroller peripherals in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Main system rail regulator; interfaces directly with battery and enables rapid wake-from-sleep transitions. Use Value: 100µA constant IQ and 300µs typical startup delay support long battery life and responsive user interface-even under varying load conditions. |
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 |
|---|---|---|---|
| TPS76350DBVR | 5.0V fixed, 150mA, 220mV dropout at 150mA; no auto-discharge; 50µVRMS noise; SOT23-5 package. | Lacks active output discharge-requires external circuitry for controlled shutdown sequencing. | Choose when auto-discharge is unnecessary and higher PSRR (65dB @ 1kHz) is prioritized over lowest noise. |
| MCP1700T-5002E/TT | 5.0V fixed, 250mA, 178mV dropout at 250mA; 35µVRMS noise; no BP pin or auto-discharge; SOT23-3 package (no SHDN). | 3-pin package omits shutdown control; higher max current but larger dropout and no discharge path. | Choose for cost-sensitive, always-on applications where shutdown control and fast discharge are not required. |
Compared with TPS76350DBVR and MCP1700T-5002E/TT, the MAX8878EUK50-T uniquely combines 30µVRMS noise, 10nA shutdown, and integrated auto-discharge in a pin-compatible '2982 footprint-making it optimal for space-constrained, battery-powered systems requiring precise power sequencing and ultra-low noise.
Availability
MAX8878EUK50-T is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, and hand-held instruments requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across industrial temperature range (-40°C to +85°C).
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 quiescent current, and robust protection features-including reverse-battery tolerance and thermal shutdown-in miniature SOT23 packages.
FAQ
What is the output voltage tolerance of the MAX8878EUK50-T over temperature and load?
The MAX8878EUK50-T delivers 5.0V output with ±1.4% accuracy across the full operating range: -40°C to +85°C ambient temperature and 0.1mA to 120mA load current. This specification is guaranteed by production testing and statistical correlation-not just typical values-ensuring consistent performance in real-world portable equipment deployments where battery voltage and temperature vary widely.
Does the MAX8878EUK50-T require an external BP capacitor, and what happens if it's omitted?
Yes, the MAX8878EUK50-T requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µVRMS output noise. Omitting it increases output noise significantly-up to 100µVRMS or more-due to unfiltered reference noise coupling into the error amplifier. The BP pin is not optional; it is integral to the device's low-noise architecture and must be used per the datasheet layout guidelines.
How does the auto-discharge function of the MAX8878EUK50-T operate, and what is its resistance value?
The MAX8878EUK50-T activates its auto-discharge function when the SHDN pin is driven low: an internal 300Ω switch connects the OUT pin to GND, actively discharging output capacitance. This feature is exclusive to the MAX8878 family (not present in MAX8877) and eliminates need for external discharge FETs or resistors-reducing BOM count and PCB area in power-sequenced systems such as modems or handheld instruments.
Can the MAX8878EUK50-T be used with input voltages below 2.5V?
No-the MAX8878EUK50-T has a minimum input voltage rating of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V violates specifications and may result in loss of regulation, increased dropout, or undefined behavior. For sub-2.5V inputs, alternative regulators such as the MAX8860 (1.8V min input) should be evaluated.
What thermal derating applies to the MAX8878EUK50-T in SOT23-5 regular package?
In the SOT23-5 regular package, the MAX8878EUK50-T has a thermal resistance θJB of 140°C/W and a maximum continuous power dissipation of 571mW at +70°C ambient. Above +70°C, power dissipation must be linearly derated by 7.1mW/°C-meaning at +85°C ambient, max allowable dissipation drops to ~465mW. Proper GND pad thermal connection is mandatory to meet these ratings.
MAX8878EUK50-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):
- 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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