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Analog Devices Inc./Maxim Integrated MAX8878EUK25+
- Part No.:
- MAX8878EUK25+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8878EUK25+.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,289
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Product details
Overview
MAX8878EUK25+ from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.5V fixed output, 150mA max output current, 165mV dropout at full load, 30µVRMS output noise, and 10nA shutdown current. It uses an internal P-channel MOSFET pass device and delivers stable power to RF-sensitive analog circuitry in portable battery-powered systems.
For engineers reviewing the MAX8878EUK25+ datasheet, MAX8878EUK25+ pinout, MAX8878EUK25+ application, or MAX8878EUK25+ equivalent, key selection criteria include dropout performance at 150mA, BP-capacitor–dependent noise reduction, auto-discharge functionality, and SOT23-5 compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8878EUK25+ integrates a 1.25V bandgap reference, error amplifier, and P-channel MOSFET pass transistor with RDS(ON) ≈ 1.1Ω. Its feedback network is fully internal, setting VOUT = 2.5V ±1.4% across -40°C to +85°C without external resistors.
It features active auto-discharge via a 300Ω internal discharge path from OUT to GND during SHDN assertion, thermal shutdown at +155°C with 15°C hysteresis, reverse-battery protection limiting reverse current to ≤1mA, and a dedicated BP pin for 80Hz noise filtering using a 0.01µF ceramic capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.4% over -40°C to +85°C - eliminates need for external feedback resistors and ensures precision rail for ADC references or RF biasing. |
| Max Output Current | 150mA continuous - supports moderate-power microcontrollers, sensors, and RF front-end ICs in compact handheld devices. |
| Dropout Voltage | 165mV at 150mA - enables operation down to VIN = 2.665V, extending usable battery life in single-cell Li-ion or alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz, CBP = 0.01µF, COUT = 10µF) - low enough for noise-sensitive analog signal chains including audio codecs and precision op-amps. |
| Quiescent Current | 100µA at full load and in dropout - constant supply current independent of load or input voltage, optimizing battery runtime under dynamic load conditions. |
| Shutdown Current | 10nA typical - reduces system standby power to negligible levels, critical for always-on wake-on-event applications. |
| Auto-Discharge | Active 300Ω discharge path from OUT to GND when SHDN = low - prevents floating outputs and ensures safe reset sequencing in multi-rail systems. |
Pinout & Package
MAX8878EUK25+ is housed in a RoHS-compliant, lead-free 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical return and thermal path. The package measures 2.9mm × 1.6mm × 1.1mm and is optimized for high-density PCB layouts.
| 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 immunity. |
| 2 GND | Power ground and thermal pad | Electrical reference and primary heat conduction path; must connect to large copper area for thermal management. |
| 3 SHDN | Active-low enable/discharge control | Logic low (≤0.4V) disables regulation and activates auto-discharge; tied to IN for always-on operation. |
| 4 BP | Bypass reference noise filter node | Connects to 0.01µF ceramic capacitor to form 80Hz low-pass filter; determines output noise floor and startup time. |
| 5 OUT | Regulated output | Delivers up to 150mA at 2.5V; 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 - extends battery life vs. PNP-based regulators. |
| Auto-discharge function | 300Ω internal discharge path actively pulls OUT to GND during shutdown - prevents unintended biasing of downstream circuitry and simplifies power sequencing. |
| Reverse battery protection | Limits reverse current to ≤1mA when VIN or SHDN falls below GND - protects IC and system from damage due to incorrect battery insertion. |
| Thermal shutdown with hysteresis | Triggers at +155°C and re-enables only after cooling by 15°C - provides robust fault recovery without latch-up during sustained overload. |
| BP-pin noise filtering | Internal 200kΩ resistor + external 0.01µF capacitor forms calibrated 80Hz filter - reduces reference noise contribution to output, achieving 30µVRMS total noise. |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering RF transceiver bias rails and baseband analog sections in GSM/EDGE handsets with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Low-noise 2.5V LDO supplying VBB and VRF domains; maintains PSRR >63dB below 10kHz to suppress switching noise from PMIC. Use Value: 30µVRMS noise and 165mV dropout allow clean, efficient operation down to 2.665V - extends talk time by ~12% versus higher-dropout alternatives. |
Use Scenario: Providing regulated 2.5V supply to smart-card interface logic and EEPROM in hot-pluggable PCMCIA Type II cards. IC Role / Device Role / Timing Role: Primary post-regulator delivering stable rail during card insertion/removal transients and host bus voltage fluctuations. Use Value: Auto-discharge ensures rapid VOUT collapse on SHDN assertion - meets PCMCIA 2.01 hot-swap timing requirements and prevents data corruption. |
| Hand-Held Instruments | Electronic Planners |
|
Use Scenario: Supplying precision ADC reference and op-amp rails in portable multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Low-drift, low-noise 2.5V source for 16-bit SAR ADC reference buffers and signal-conditioning stages. Use Value: ±1.4% output accuracy and <0.04%/mA load regulation minimize measurement offset drift across battery discharge cycle. |
Use Scenario: Powering real-time clock (RTC), SRAM backup, and touch-screen controller in battery-backed PDAs and organizers. IC Role / Device Role / Timing Role: Always-on LDO maintaining 2.5V for RTC/SRAM during main system sleep; enabled via microcontroller GPIO. Use Value: 10nA shutdown current reduces annual battery drain to <1% - enables 5+ year coin-cell lifetime in RTC backup mode. |
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 |
|---|---|---|---|
| TPS76325DBVR | 250mA rated, 220mV dropout at 150mA, 50µVRMS noise, no auto-discharge, SOT23-5 pinout | Lacks active output discharge; higher noise limits use in RF/analog sections | Choose when higher output current is required and auto-discharge is unnecessary. |
| MCP1702T-2502E/MB | 250mA rated, 600mV dropout at 150mA, 30µVRMS noise, 1.6µA quiescent, no auto-discharge, SOT23-5 | Higher dropout limits usable battery range; ultra-low IQ suits long-term standby but not dynamic loads | Prefer for ultra-low-power sensor nodes where dropout is not critical and discharge is handled externally. |
Compared with TPS76325DBVR and MCP1702T-2502E/MB, MAX8878EUK25+ uniquely combines 165mV dropout, 30µVRMS noise, and integrated auto-discharge in a '2982-compatible SOT23-5 - making it optimal for space-constrained, battery-critical RF and precision analog designs requiring safe power-down behavior.
Availability
MAX8878EUK25+ is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, hand-held instruments, and electronic planners requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for MAX8878EUK25+ 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 dropout, and intelligent power-control features like auto-discharge and reverse-battery protection.
FAQ
What is the output voltage tolerance of the MAX8878EUK25+ over temperature and load?
The MAX8878EUK25+ delivers 2.5V output with ±1.4% accuracy across -40°C to +85°C and for load currents from 0.1mA to 120mA. At 25°C and 0.1mA load, tolerance tightens to ±1.4% min/max; this specification ensures reliable operation for precision analog circuits without external trimming. The MAX8878EUK25+ maintains this accuracy even as battery voltage declines into dropout region.
Does the MAX8878EUK25+ require external feedback resistors to set its output voltage?
No, the MAX8878EUK25+ has a factory-preset 2.5V output implemented via internal resistor divider - no external components are needed. This simplifies layout, improves reliability, and eliminates resistor tolerance and temperature drift errors. All variants in the MAX8877/MAX8878 family, including MAX8878EUK25+, use this fixed-output architecture.
How does the auto-discharge function work in the MAX8878EUK25+?
When SHDN is pulled low, the MAX8878EUK25+ activates an internal 300Ω switch between OUT and GND, actively discharging the output capacitor. This ensures VOUT collapses rapidly (within microseconds depending on COUT), preventing floating nodes and unsafe biasing of downstream ICs. The MAX8877EUK25+ lacks this feature - only MAX8878 variants include auto-discharge.
What capacitor values are recommended for stable operation of the MAX8878EUK25+?
For stable operation, use ≥1µF X7R/X5R ceramic capacitor (ESR < 0.2Ω) on OUT and ≥1µF ceramic on IN. For VOUT = 2.5V, 1µF suffices; for lower voltages, 3.3µF is recommended. A 0.01µF ceramic capacitor on BP is mandatory for 30µVRMS noise performance. Larger COUT improves transient response but must stay within ESR stability region shown in datasheet Figure 17.
Is the MAX8878EUK25+ pin-compatible with the industry-standard '2982 regulator?
Yes, the MAX8878EUK25+ uses the exact same SOT23-5 pinout as the industry-standard µA78Lxx and '2982 family: Pin 1 = IN, Pin 2 = GND, Pin 3 = SHDN, Pin 4 = BP, Pin 5 = OUT. This allows drop-in replacement in existing '2982 layouts while delivering improved dropout (165mV vs. ~350mV), lower noise (30µVRMS vs. ~100µVRMS), and added features like auto-discharge.
MAX8878EUK25+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- 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
MAX8878EUK25+ FAQ
1.How can I place an order for MAX8878EUK25+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EUK25+ 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 MAX8878EUK25+ reliable?
The price and inventory of MAX8878EUK25+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EUK25+ is usually 5 days.
3.What payment methods are accepted for MAX8878EUK25+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EUK25+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EUK25+?
MAX8878EUK25+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EUK25+ 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 MAX8878EUK25+?
For technical support, including MAX8878EUK25+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EUK25+ requirements.
6.How does Aetrix verify that MAX8878EUK25+ is sourced from the original manufacturer or authorized distributors?
All MAX8878EUK25+ 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 MAX8878EUK25+ meets industry standards.
7.What is the process for return or replacement of MAX8878EUK25+?
All MAX8878EUK25+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EUK25+, 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 MAX8878EUK25+ part is unused and in its original packaging.
Return procedure for MAX8878EUK25+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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