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Analog Devices Inc./Maxim Integrated MAX8878EUK27+
- Part No.:
- MAX8878EUK27+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8878EUK27+.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
MAX8878EUK27+ from Maxim Integrated is a low-noise, low-dropout linear regulator with a preset 2.7V 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, and an auto-discharge function active during shutdown.
For engineers reviewing the MAX8878EUK27+ datasheet, MAX8878EUK27+ pinout, MAX8878EUK27+ application, or MAX8878EUK27+ equivalent, key selection criteria include its 2.7V fixed output accuracy (±1.4%), SOT23-5 regular package compatibility with '2982 footprint, auto-discharge capability, and ultra-low 10nA shutdown current - critical for power-sensitive handheld instrumentation and telecom devices.
Technical Context
The MAX8878EUK27+ uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling low dropout and eliminating 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, maintaining regulation across temperature and load.
It incorporates dedicated circuitry for auto-discharge (unique to MAX8878 variants), a 10nA logic-controlled SHDN input, and a BP pin with internal 200kΩ resistor forming an 80Hz low-pass filter when paired with a 0.01µF ceramic capacitor - directly reducing output voltage noise to 30µVRMS (10Hz–100kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.7V ±1.4% over -40°C to +85°C - ensures stable rail for 2.7V-tolerant microcontrollers and RF front-ends. |
| Max Output Current | 150mA continuous - sufficient for single-core MCUs, Bluetooth modules, or sensor signal chains in compact portable designs. |
| Dropout Voltage | 165mV at 150mA - enables operation down to 2.865V input, extending usable battery life in single-cell Li-ion or alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) with 0.01µF BP cap - meets low-noise requirements for ADC references and precision analog circuits. |
| Supply Current | 100µA operating (load-independent); 10nA in shutdown - minimizes quiescent drain during sleep modes in always-on devices. |
| Shutdown Discharge | 300Ω active pull-down (MAX8878 only) - rapidly discharges output capacitance to ground upon SHDN assertion, preventing latch-up or backfeed. |
| Protection Features | Thermal shutdown (155°C), short-circuit limit (160–390mA), reverse-battery protection (<1mA reverse current) - ensures robustness in unregulated power environments. |
Pinout & Package
MAX8878EUK27+ is housed in a RoHS-compliant 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical reference and thermal path. The package is pin-compatible with industry-standard '2982 regulators and supports standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply connection | 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 be soldered to large PCB copper area to manage power dissipation up to 571mW at +70°C ambient. |
| 3 SHDN | Active-low enable/disable control | Pulled low disables regulator and activates auto-discharge; pulled high (≥2.0V) enables operation; draws ≤0.5µA at +85°C. |
| 4 BP | Bypass node for noise reduction | Connects internally to 200kΩ resistor; 0.01µF ceramic cap here reduces output noise by filtering reference noise before error amp. |
| 5 OUT | Regulated output terminal | Delivers 2.7V @ up to 150mA; requires ≥1µF ceramic cap (ESR <0.2Ω) for VOUT ≥2.5V; stable with COUT ESR 0.01–10Ω. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Active 300Ω discharge path from OUT to GND during SHDN - eliminates residual voltage that could interfere with system reset sequencing. |
| P-channel MOSFET pass element | 1.1Ω typical RDS(ON) enables 165mV dropout at full load without base-drive current loss - extends battery runtime vs. PNP-based LDOs. |
| Ultra-low shutdown current | 10nA max at +25°C - allows multi-year shelf life in battery-backed memory or real-time clock circuits without significant self-discharge. |
| Reverse-battery protection | Limits reverse current to <1mA when 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; re-enables after 15°C cooldown - provides safe, self-recovering fault handling under sustained overload. |
Applications
| Hand-Held Instruments | Cellular Telephones |
|---|---|
|
Use Scenario: Portable multimeter or gas detector powered by single AA/AAA cells with intermittent high-current LCD backlight pulses. IC Role / Device Role / Timing Role: Primary 2.7V supply for MCU, ADC, and display driver - maintains regulation during rapid load transients. Use Value: 12mV typical load-step deviation (0→50mA) and 30µVRMS noise ensure accurate 16-bit ADC conversions without external filtering. |
Use Scenario: Powering baseband processor I/O rails in GSM handset during burst transmission mode. IC Role / Device Role / Timing Role: Low-noise 2.7V bias for level-shifting interfaces and RF synthesizer VCO tuning lines. Use Value: 63dB PSRR at low frequencies suppresses switching noise from PMIC DC-DC converters sharing the same battery source. |
| PCMCIA Cards | Electronic Planners |
|
Use Scenario: Compact flash adapter requiring clean 2.7V for NAND controller and interface logic during hot-plug events. IC Role / Device Role / Timing Role: Isolated, protected 2.7V regulator decoupled from host 3.3V supply - prevents backfeed and ensures safe enumeration. Use Value: Reverse-battery protection and auto-discharge prevent latch-up when card is inserted into miswired or damaged slots. |
Use Scenario: Power management in pen-based PDAs with lithium coin cell backup and main alkaline battery. IC Role / Device Role / Timing Role: Main 2.7V supply for touch-screen controller and SRAM retention - enabled only during active use via SHDN. Use Value: 10nA shutdown current enables >5-year data retention on coin cell; 100µA operating current supports weeks of active use per alkaline set. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8877EUK27+ | No auto-discharge; identical pinout, specs, and package - differs only in absence of active OUT discharge path. | Suitable where output hold-up is required during shutdown (e.g., preserving state in volatile memory). | Select MAX8877EUK27+ if auto-discharge is undesirable; verify system reset timing does not require rapid VOUT collapse. |
| MCP1700T-2702E/TT | 250mA rating, 6µA quiescent current, no BP pin or auto-discharge; SOT23-3 package (3-pin, no SHDN/BP). | Lacks shutdown control and noise optimization - limited to always-on, low-power sensor nodes without transient-sensitive loads. | Choose MCP1700T-2702E/TT only for cost-sensitive, non-shutdown applications where 30µVRMS noise and 10nA shutdown are unnecessary. |
Compared with MAX8877EUK27+, the MAX8878EUK27+ adds auto-discharge for safer system-level power sequencing, while the MCP1700T-2702E/TT trades noise performance, shutdown control, and package compatibility for lower quiescent current and cost - making it unsuitable as a drop-in replacement.
Availability
MAX8878EUK27+ is available at Aetrix Electronics and suitable for hand-held instruments, cellular telephones, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX8878EUK27+ 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, minimal quiescent current, and robust protection - targeting space-constrained, single-cell systems where efficiency and reliability are critical.
FAQ
What is the output voltage tolerance of the MAX8878EUK27+ over temperature and load?
The MAX8878EUK27+ delivers a nominal 2.7V output with ±1.4% accuracy across the full -40°C to +85°C operating range and for output currents from 0.1mA to 120mA. At +25°C and 0.1mA load, the tolerance tightens to ±1.4% (±37.8mV). This specification is production-tested and guaranteed via Statistical Quality Control methods, ensuring consistent performance in battery-powered portable devices.
Does the MAX8878EUK27+ require external capacitors, and what values are recommended?
Yes, the MAX8878EUK27+ requires three external capacitors: a minimum 1µF ceramic capacitor (ESR <0.2Ω) between IN and GND; a 1µF–10µF ceramic capacitor between OUT and GND (1µF minimum for 2.7V output); and a 0.01µF ceramic capacitor between BP and GND. These values ensure stability across temperature, minimize output noise to 30µVRMS, and maintain adequate PSRR and transient response - as validated in the device's Typical Operating Characteristics.
How does the auto-discharge feature of the MAX8878EUK27+ operate, and what is its resistance value?
The MAX8878EUK27+ auto-discharge feature activates when the SHDN pin is driven low, connecting the OUT pin to GND through an internal 300Ω switch. This actively pulls down output capacitance - for example, discharging a 10µF capacitor from 2.7V to <100mV in under 33ms. Unlike passive bleed resistors, this controlled discharge prevents backfeed, ensures deterministic reset behavior, and eliminates floating outputs during power-down sequences.
Can the MAX8878EUK27+ be used with input voltages below 2.5V?
No - the MAX8878EUK27+ has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V is not characterized or guaranteed; regulation fails and output collapses as VIN approaches VOUT. For sub-2.5V operation, alternative regulators such as the MAX1726 (1.8V min VIN) must be evaluated - the MAX8878EUK27+ is strictly intended for 2.5V–6.5V input battery or adapter sources.
What thermal protection mechanisms are built into the MAX8878EUK27+?
The MAX8878EUK27+ includes thermal-overload protection that disables the pass transistor when junction temperature exceeds +155°C, then re-enables it after cooling by 15°C hysteresis. This pulsed operation prevents permanent damage during sustained overload. Combined with its SOT23-5 regular package (θJB = 140°C/W), the device supports up to 571mW continuous dissipation at +70°C ambient - provided the GND pin is soldered to an adequate PCB copper area for heat spreading.
MAX8878EUK27+ 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):
- 2.7V
- 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
MAX8878EUK27+ FAQ
1.How can I place an order for MAX8878EUK27+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EUK27+ 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 MAX8878EUK27+ reliable?
The price and inventory of MAX8878EUK27+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EUK27+ is usually 5 days.
3.What payment methods are accepted for MAX8878EUK27+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EUK27+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EUK27+?
MAX8878EUK27+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EUK27+ 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 MAX8878EUK27+?
For technical support, including MAX8878EUK27+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EUK27+ requirements.
6.How does Aetrix verify that MAX8878EUK27+ is sourced from the original manufacturer or authorized distributors?
All MAX8878EUK27+ 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 MAX8878EUK27+ meets industry standards.
7.What is the process for return or replacement of MAX8878EUK27+?
All MAX8878EUK27+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EUK27+, 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 MAX8878EUK27+ part is unused and in its original packaging.
Return procedure for MAX8878EUK27+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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