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Analog Devices Inc./Maxim Integrated MAX8878EUK33+
- Part No.:
- MAX8878EUK33+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8878EUK33+.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,332
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Product details
Overview
MAX8878EUK33+ from Maxim Integrated is a low-noise, low-dropout linear regulator with fixed 3.3V output, delivering up to 150mA from 2.5V–6.5V input. It features 30µVRMS output noise, 165mV dropout at 150mA, and 100µA operating supply current - all enabled by an internal P-channel MOSFET pass transistor. It serves as a precision power source for battery-powered RF and digital baseband circuits in portable communications equipment.
For engineers reviewing the MAX8878EUK33+ datasheet, MAX8878EUK33+ pinout, MAX8878EUK33+ application, or MAX8878EUK33+ equivalent, key selection criteria include its auto-discharge function (exclusive to MAX8878), ±1.4% output voltage accuracy over temperature, 10nA shutdown current, reverse battery protection, and SOT23-5 regular package compatibility with industry-standard '2982 footprints.
Technical Context
The MAX8878EUK33+ uses a P-channel MOSFET pass element with ~1.1Ω RDS(ON), enabling ultra-low quiescent current (100µA) independent of load or dropout condition. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin, maintaining regulation across -40°C to +85°C.
It integrates thermal shutdown (155°C trip, 15°C hysteresis), short-circuit current limiting (160–390mA), and reverse battery protection that limits reverse current to 1mA. The MAX8878 variant uniquely adds active output discharge via a 300Ω internal path to GND during SHDN assertion - a feature absent in MAX8877.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.4% (0.1mA–120mA, -40°C to +85°C); enables direct replacement of 3.3V logic rails without external resistors. |
| Max Output Current | 150mA continuous; supports microcontroller cores, RF transceivers, and sensor interfaces in space-constrained portable designs. |
| Dropout Voltage | 165mV at 150mA; allows operation down to 3.465V input for 3.3V output - critical for extending Li-ion battery runtime to <3.5V. |
| Output Noise | 30µVRMS (10Hz–100kHz, CBP=0.01µF, COUT=10µF); meets stringent noise requirements for ADC references and PLL VCO supplies. |
| Quiescent Current | 100µA under full load and in dropout; ensures minimal battery drain during active operation, unlike PNP-based regulators. |
| Shutdown Current | 10nA typical (25°C); reduces system standby power to nanowatt levels - essential for always-on wake-up circuitry. |
| Auto-Discharge | 300Ω internal discharge path to GND when SHDN = LOW; prevents floating outputs and unintended biasing of downstream circuitry. |
Pinout & Package
MAX8878EUK33+ is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND pin serving dual electrical and thermal functions - requiring connection to a large copper pour for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND for stability and line-transient suppression. |
| 2 GND | Ground and thermal pad | Primary return path and heat sink; must be soldered to ≥100mm² copper area to maintain TJ ≤150°C at full load. |
| 3 SHDN | Active-low enable/disable control | Pulls output to GND via internal 300Ω resistor when LOW; connect to IN or logic HIGH for normal operation. |
| 4 BP | Bypass capacitor terminal | Connects to 0.01µF ceramic cap to reduce reference noise; forms 80Hz low-pass filter with internal 200kΩ resistor. |
| 5 OUT | Regulated output | Delivers 3.3V/150mA; requires ≥1µF (ESR <0.2Ω) ceramic cap for VOUT ≥2.5V; stable with 1–10µF range. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on shutdown | 300Ω internal discharge path actively pulls OUT to GND within microseconds - eliminates need for external bleed resistors in battery-backed systems. |
| Reverse battery protection | Limits reverse current to ≤1mA when VIN or SHDN falls below GND - prevents damage and leakage in miswired battery compartments. |
| P-channel MOSFET pass device | Eliminates base-drive current; maintains 100µA IQ regardless of load or dropout - extends battery life vs. PNP alternatives. |
| Low-noise reference architecture | 1.25V bandgap + BP pin filtering achieves 30µVRMS noise - suitable for noise-sensitive analog signal chains without additional LDO staging. |
| '2982 pin-compatible footprint | Direct mechanical and electrical replacement for legacy 5-pin regulators - enables drop-in upgrade without PCB rework. |
Applications
| Cellular Handset Baseband | PCMCIA Card Power |
|---|---|
|
Use Scenario: Powering ARM9 application processor core and DDR memory interface in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying noise-sensitive digital logic and memory I/O with tight voltage tolerance. Use Value: 165mV dropout preserves usable battery range down to 3.465V; 30µVRMS noise avoids bit errors in high-speed data transfers. |
Use Scenario: Providing regulated 3.3V to Type II PCMCIA cards in laptops and industrial terminals. IC Role / Device Role / Timing Role: Hot-swap capable power rail with reverse polarity protection and fast startup. Use Value: Reverse battery protection prevents card damage during insertion; 10nA shutdown enables zero-power card ejection detection. |
| Hand-Held Test Instrument | Palmtop Computer System Rail |
|
Use Scenario: Supplying precision analog front-end (AFE) and 12-bit SAR ADC in portable multimeters. IC Role / Device Role / Timing Role: Low-noise 3.3V reference rail decoupled from noisy digital supplies via BP capacitor. Use Value: 30µVRMS noise ensures <0.01% measurement error floor; auto-discharge prevents AFE latch-up during power cycling. |
Use Scenario: Powering main logic board including CPU, LCD controller, and flash memory in Windows CE palmtops. IC Role / Device Role / Timing Role: Main system LDO with thermal shutdown and current limiting for robust field operation. Use Value: 155°C thermal shutdown with 15°C hysteresis prevents thermal runaway during extended use; 150mA capacity covers peak CPU loads. |
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 |
|---|---|---|---|
| MAX8877EUK33+ | No auto-discharge; identical pinout, specs, and package - same 3.3V output, 150mA, 30µVRMS noise, and 165mV dropout. | Preferred where output discharge is unnecessary (e.g., non-battery-backed systems); lower cost due to missing discharge circuit. | Select MAX8877EUK33+ only if auto-discharge is not required - avoids paying for unused functionality. |
| Torex XC6206P332MR-G | 300mA output, 250mV dropout at 300mA, 40µVRMS noise, no auto-discharge, SOT23-5 pinout but different pin assignment (IN/GND/EN/OUT). | Higher current capability suits more demanding loads, but lacks reverse battery protection and requires layout change due to non-'2982' pin mapping. | Choose XC6206P332MR-G only when >150mA is needed and PCB redesign is acceptable - not a drop-in replacement. |
Compared with MAX8877EUK33+, the MAX8878EUK33+ adds critical auto-discharge for battery safety but shares identical regulation performance; versus XC6206P332MR-G, it offers superior noise, reverse protection, and true '2982' pin compatibility - making it optimal for retrofitting legacy designs with enhanced safety.
Availability
MAX8878EUK33+ 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 traceable sourcing.
Supply support for MAX8878EUK33+ 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, automotive, and communications markets.
The MAX8877/MAX8878 family was designed specifically for battery-powered portable electronics needing ultra-low noise, low IQ, and robust protection - targeting cellular handsets, PDAs, and modular peripherals where size, efficiency, and reliability are paramount.
FAQ
What is the output voltage tolerance of the MAX8878EUK33+ over temperature and load?
The MAX8878EUK33+ delivers 3.3V with ±1.4% accuracy across the full -40°C to +85°C operating range and for output currents from 0.1mA to 120mA. This specification is guaranteed by production testing and statistical correlation - ensuring consistent 3.3V rail integrity in battery-powered devices exposed to wide ambient conditions.
Does the MAX8878EUK33+ require external components for stable operation?
Yes - the MAX8878EUK33+ requires three external capacitors: a 1µF ceramic capacitor on IN to GND, a 1µF (minimum, ESR <0.2Ω) ceramic capacitor on OUT to GND, and a 0.01µF ceramic capacitor on BP to GND. These ensure stability, low noise, and proper transient response per the datasheet's capacitor selection guidelines.
How does the auto-discharge function work in the MAX8878EUK33+?
When the SHDN pin is driven LOW, the MAX8878EUK33+ activates an internal 300Ω switch between OUT and GND, actively discharging the output capacitor. This occurs within microseconds and eliminates residual voltage - preventing unintended operation of downstream circuitry during shutdown or battery removal.
Can the MAX8878EUK33+ replace the industry-standard '2982 regulator?
Yes - the MAX8878EUK33+ is explicitly designed as a pin-compatible upgrade to the industry-standard '2982 family. It uses the identical SOT23-5 regular footprint, matching pin assignments (IN, GND, SHDN, BP, OUT), and improves upon dropout voltage and noise performance without requiring PCB changes.
What protection features are integrated into the MAX8878EUK33+?
The MAX8878EUK33+ integrates thermal shutdown (155°C trip, 15°C hysteresis), short-circuit current limiting (160–390mA), reverse battery protection (≤1mA reverse current), and output overcurrent protection. These features operate autonomously without external circuitry - enhancing system reliability in unattended portable applications.
MAX8878EUK33+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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
MAX8878EUK33+ FAQ
1.How can I place an order for MAX8878EUK33+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EUK33+ 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 MAX8878EUK33+ reliable?
The price and inventory of MAX8878EUK33+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EUK33+ is usually 5 days.
3.What payment methods are accepted for MAX8878EUK33+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EUK33+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EUK33+?
MAX8878EUK33+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EUK33+ 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 MAX8878EUK33+?
For technical support, including MAX8878EUK33+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EUK33+ requirements.
6.How does Aetrix verify that MAX8878EUK33+ is sourced from the original manufacturer or authorized distributors?
All MAX8878EUK33+ 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 MAX8878EUK33+ meets industry standards.
7.What is the process for return or replacement of MAX8878EUK33+?
All MAX8878EUK33+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EUK33+, 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 MAX8878EUK33+ part is unused and in its original packaging.
Return procedure for MAX8878EUK33+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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