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Analog Devices Inc./Maxim Integrated MAX8877EUK25
- Part No.:
- MAX8877EUK25
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8877EUK25.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,217
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Product details
Overview
The MAX8877EUK25 from Maxim Integrated is a low-noise, low-dropout linear regulator with fixed 2.5V output, delivering up to 150mA from a 2.5V–6.5V input. It features 30µVRMS output noise, 165mV dropout at 150mA, ±1.4% output voltage accuracy, and 100µA operating supply current independent of load or dropout condition. It serves as a precision power source for battery-powered RF and analog signal chains in portable communications equipment.
For engineers reviewing the MAX8877EUK25 datasheet, MAX8877EUK25 pinout, MAX8877EUK25 application, or MAX8877EUK25 equivalent, key selection criteria include dropout performance under 150mA load, ultra-low shutdown current (10nA), reverse-battery protection, BP-capacitor–dependent noise reduction, and SOT23-5 compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8877EUK25 employs 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 integrates thermal shutdown (155°C trip, 15°C hysteresis), short-circuit protection, and reverse-battery protection that limits reverse current to 1mA. Unlike the MAX8878, it lacks auto-discharge - shutdown places the output in high-impedance state without active discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.4% over -40°C to +85°C; enables direct replacement of 2.5V logic rails without external resistors. |
| Max Output Current | 150mA continuous; supports moderate-power RF ICs, ADCs, and microcontroller cores in compact portable designs. |
| Dropout Voltage | 165mV at 150mA; allows operation down to VIN = 2.665V, extending usable battery life in single-cell Li-ion or alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) with 0.01µF BP capacitor; meets stringent noise requirements for RF front-ends and precision analog sensors. |
| Quiescent Current | 100µA over full load and dropout range; ensures minimal standby drain in always-on subsystems like real-time clocks or wake-up monitors. |
| Shutdown Current | 10nA logic-controlled shutdown; reduces system-level leakage to negligible levels during deep sleep modes. |
| Input Voltage Range | 2.5V to 6.5V; compatible with single-cell Li-ion (2.7–4.2V), dual-cell alkaline (3–6V), and 5V rail-sourced applications. |
Pinout & Package
MAX8877EUK25 is housed in a 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 assembly.
| 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 | Power ground and thermal pad | Primary return path; must be soldered to large copper area to manage 571mW max dissipation at +70°C ambient. |
| 3 - SHDN | Active-low enable control | Logic low (≤0.4V) disables regulator and reduces IQ to 10nA; connect to IN or pull-high for always-on operation. |
| 4 - BP | Bypass capacitor connection | Connects to internal 200kΩ resistor forming 80Hz low-pass filter; 0.01µF ceramic here reduces output noise by >50%. |
| 5 - OUT | Regulated 2.5V output | Sources up to 150mA; requires ≥1µF ceramic (ESR <0.2Ω) for VOUT ≥2.5V; stable across -40°C to +85°C. |
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 runtime predictability. |
| Reverse battery protection | Limits reverse current to ≤1mA when VIN or SHDN falls below GND, preventing damage in miswired or hot-plug scenarios without external diodes. |
| Thermal shutdown with hysteresis | Shuts down at 155°C junction temperature and re-enables only after 15°C cooldown, preventing thermal oscillation during sustained overload. |
| Current limiting | Guarantees minimum 160mA current limit and withstands indefinite short-circuit to GND without latch-up or degradation. |
| '2982 pinout compatibility | Direct drop-in replacement for legacy 5-pin regulators in existing PCB layouts - no redesign or footprint change required. |
Applications
| Cellular Handset RF Power Amplifier Bias | Portable Medical Sensor Signal Chain |
|---|---|
|
Use Scenario: Providing clean 2.5V bias to GaAs RF power amplifiers in GSM/EDGE handsets where supply ripple directly modulates output spectrum. IC Role / Device Role / Timing Role: Low-noise voltage source regulating PA collector voltage; operates in dropout during battery sag to maintain transmit power. Use Value: 30µVRMS noise prevents AM-to-PM conversion in PA stage; 165mV dropout extends talk time by >12 minutes on single-cell Li-ion. |
Use Scenario: Powering 24-bit delta-sigma ADCs and low-noise instrumentation amplifiers in handheld ECG or pulse oximeters. IC Role / Device Role / Timing Role: Precision analog supply decoupled from noisy digital rails; maintains SNR >105dB across full operating temperature range. Use Value: ±1.4% output accuracy eliminates need for post-regulation trimming; 100µA IQ enables >7-day battery life in continuous monitoring mode. |
| PCMCIA Card 2.5V I/O Interface | Industrial Hand-Held Data Logger |
|
Use Scenario: Generating 2.5V for JEDEC-compliant PCMCIA Type II card interface logic and flash memory I/O buffers. IC Role / Device Role / Timing Role: Hot-swap–capable LDO supplying regulated I/O voltage during card insertion; reverse-battery protection prevents bus damage. Use Value: 10nA shutdown current isolates card power during ejection; '2982 pinout allows reuse of legacy socket designs without layout revision. |
Use Scenario: Powering microcontroller, EEPROM, and RS-485 transceiver in battery-operated environmental data loggers deployed in remote field sites. IC Role / Device Role / Timing Role: Primary system regulator managing duty-cycled operation - active during sensor readout, shut down between samples. Use Value: Thermal shutdown protects against enclosure overheating in solar-heated enclosures; 571mW power dissipation rating supports 85°C ambient operation. |
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 | Higher 220mV dropout at 150mA; 40µVRMS noise; 120µA IQ; no reverse-battery protection. | Lacks reverse-polarity hardening - requires external diode in battery-fed systems. | Choose when cost sensitivity outweighs reverse-protection need and board space permits added diode. |
| MCP1702T-2502E/MB | Lower 175mV dropout at 250mA; 45µVRMS noise; 2.5µA IQ (no shutdown); no BP pin or adjustable noise filtering. | No logic-controlled shutdown or BP-based noise optimization - unsuitable for ultra-low-power sleep modes. | Prefer for always-on, non-battery applications where lowest quiescent current is secondary to cost and simplicity. |
Compared with TPS76325DBVR and MCP1702T-2502E/MB, the MAX8877EUK25 uniquely combines sub-200mV dropout, 30µVRMS noise with BP tuning, 10nA shutdown, and integrated reverse-battery protection - making it optimal for space-constrained, battery-powered RF and precision analog systems requiring robust fault tolerance.
Availability
MAX8877EUK25 is available at Aetrix Electronics and suitable for cellular handset RF biasing, portable medical sensor powering, PCMCIA I/O regulation, industrial data logging, and handheld instrument power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX8877EUK25 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 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 requiring ultra-low noise, low dropout, and robust fault protection - targeting RF front-ends, precision analog subsystems, and space-constrained embedded power rails.
FAQ
What is the guaranteed output voltage tolerance for MAX8877EUK25 over temperature and load?
The MAX8877EUK25 guarantees ±1.4% output voltage accuracy across the full -40°C to +85°C operating temperature range and for load currents from 0.1mA to 120mA. This specification holds for VOUT ≥ 2.5V and is confirmed in the Electrical Characteristics table of the official datasheet. The MAX8877EUK25 achieves this via laser-trimmed internal feedback resistors and a stable 1.25V bandgap reference, ensuring consistent 2.5V regulation without external components.
Does MAX8877EUK25 include auto-discharge functionality during shutdown?
No, the MAX8877EUK25 does not include auto-discharge. That feature is exclusive to the MAX8878 family members. When the MAX8877EUK25 enters shutdown (SHDN ≤ 0.4V), its output goes into high-impedance state - the output voltage decays only through external load or leakage paths. For active discharge to ground during shutdown, the MAX8878EUK25 must be selected instead.
What is the recommended BP capacitor value for optimal noise performance in MAX8877EUK25?
The recommended BP capacitor for the MAX8877EUK25 is 0.01µF ceramic (X7R or C0G dielectric). This value creates an 80Hz low-pass filter with the internal 200kΩ resistor, reducing output noise to 30µVRMS (10Hz–100kHz). Larger values (e.g., 0.1µF) marginally lower noise but increase startup time and shutdown exit delay - values above 0.1µF provide no measurable benefit and are not recommended per the datasheet.
Can MAX8877EUK25 operate with input voltages below 2.5V?
No, the MAX8877EUK25 has a minimum input voltage rating of 2.5V as specified in Absolute Maximum Ratings and Electrical Characteristics. Operation below 2.5V is not guaranteed 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 VIN) should be evaluated.
Is MAX8877EUK25 pin-compatible with the industry-standard '2982 regulator?
Yes, the MAX8877EUK25 is explicitly designed as a pin-compatible upgrade to the industry-standard '2982 regulator. Its SOT23-5 pinout matches exactly: Pin 1 (IN), Pin 2 (GND), Pin 3 (SHDN), Pin 4 (BP), Pin 5 (OUT). This allows direct replacement in existing designs without PCB modification while delivering improved dropout voltage, lower noise, and enhanced protection features.
MAX8877EUK25 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):
- 2.5V
- 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
MAX8877EUK25 FAQ
1.How can I place an order for MAX8877EUK25 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8877EUK25 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 MAX8877EUK25 reliable?
The price and inventory of MAX8877EUK25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8877EUK25 is usually 5 days.
3.What payment methods are accepted for MAX8877EUK25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8877EUK25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8877EUK25?
MAX8877EUK25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8877EUK25 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 MAX8877EUK25?
For technical support, including MAX8877EUK25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8877EUK25 requirements.
6.How does Aetrix verify that MAX8877EUK25 is sourced from the original manufacturer or authorized distributors?
All MAX8877EUK25 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 MAX8877EUK25 meets industry standards.
7.What is the process for return or replacement of MAX8877EUK25?
All MAX8877EUK25 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8877EUK25, 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 MAX8877EUK25 part is unused and in its original packaging.
Return procedure for MAX8877EUK25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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