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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 LDO
- Quantity:
- Payment:
- Shipping:
Inventory:9,560
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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, 100µA operating supply current, and integrated auto-discharge functionality. It serves as a precision power source for battery-powered portable electronics requiring stable, clean voltage rails.
For engineers reviewing the MAX8878EUK33 datasheet, MAX8878EUK33 pinout, MAX8878EUK33 application, or MAX8878EUK33 equivalent, key selection criteria include its 3.3V preset accuracy (±1.4%), thermal/short-circuit protection, reverse-battery immunity, and SOT23-5 thin-package compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8878EUK33 uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling low quiescent current 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.
It integrates logic-controlled shutdown (10nA ISHDN), thermal shutdown at +155°C with 15°C hysteresis, 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 resistance when SHDN is asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.4% over -40°C to +85°C - ensures stable rail for 3.3V logic and analog circuitry without external resistors. |
| Max Output Current | 150mA continuous - sufficient for microcontrollers, RF front-ends, and sensor interfaces in compact portable systems. |
| Dropout Voltage | 165mV at 150mA - enables operation down to VIN = 3.465V, extending usable battery life in single-cell Li-ion or multi-cell alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) with 0.01µF BP cap - minimizes interference in noise-sensitive analog/RF stages like ADCs or VCOs. |
| Quiescent Current | 100µA at full load and in dropout - maintains efficiency during light-load or brownout conditions without sacrificing regulation. |
| Shutdown Current | 10nA typical - reduces system standby power to negligible levels, critical for always-on battery-backed functions. |
| Protection Features | Thermal shutdown (+155°C), short-circuit immunity, reverse-battery protection (≤1mA reverse current) - ensures robustness in unregulated or miswired environments. |
Pinout & Package
MAX8878EUK33 is housed in a 5-pin SOT23-5 thin package (JEDEC MO-178AA), optimized for space-constrained PCB layouts and thermal performance (θJB = 110°C/W). The GND pin serves dual roles: electrical reference and primary heat path - requires connection to a large copper pour or ground plane.
| 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 pad | Electrical return path and primary heat dissipation route; must be soldered to ≥10mm² copper area for rated power handling. |
| 3 - SHDN | Active-low enable/disable control | Logic-low (<0.4V) places device in shutdown; on MAX8878EUK33, also activates 300Ω output-to-GND discharge path. |
| 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 ≥3.3µF ceramic cap (ESR <0.2Ω) for stability at VOUT < 2.5V - here, 3.3V mandates ≥3.3µF. |
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 runtime vs. PNP-based regulators. |
| Auto-discharge function (MAX8878 only) | 300Ω internal discharge path actively pulls OUT to GND during shutdown - prevents floating outputs and unintended wake-up in systems with hold-up capacitance. |
| Reverse-battery protection | Blocks reverse current to ≤1mA if VIN or SHDN falls below GND - protects downstream circuitry without external diodes or FETs. |
| Low-noise BP pin architecture | 0.01µF capacitor at BP reduces output noise to 30µVRMS by filtering reference noise before error amplifier - avoids need for post-regulation LDO filtering. |
| '2982 pin-compatible footprint | Direct replacement for legacy industry-standard regulators - enables drop-in upgrade path without PCB redesign or layout changes. |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
Use Scenario: Powering baseband processor core voltage and RF transceiver bias rails in GSM/CDMA handsets with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying noise-sensitive analog sections and digital I/O domains. Use Value: 30µVRMS noise and 165mV dropout preserve signal integrity and extend talk time by enabling operation down to 3.465V battery voltage. |
Use Scenario: Providing regulated 3.3V to PCMCIA Type II card controllers and interface logic in laptop expansion slots. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating card power from noisy host bus voltage. Use Value: Reverse-battery protection prevents damage during hot-swap insertion; 10nA shutdown current eliminates parasitic drain when card is ejected. |
| Palmtop Computers | Electronic Planners |
Use Scenario: Supplying 3.3V to ARM-based application processors and touchscreen controllers in handheld PDAs. IC Role / Device Role / Timing Role: Main system LDO managing dynamic load steps during CPU frequency scaling and display backlight activation. Use Value: Load-transient response <12mV (0→50mA step) and auto-discharge prevent brownout resets and ensure clean power-down sequencing. |
Use Scenario: Delivering stable 3.3V to real-time clock (RTC), memory backup, and LCD driver circuits in battery-backed organizers. IC Role / Device Role / Timing Role: Always-on power source maintaining RTC accuracy and SRAM retention during main system sleep. Use Value: 100µA quiescent current and 10nA shutdown mode minimize annual battery depletion - supports >5-year shelf life on CR2032. |
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 - differs only in absence of active output discharge path. | Suitable where output discharge is unnecessary (e.g., no hold-up capacitance or isolated loads). | Select MAX8877EUK33 when cost sensitivity outweighs need for controlled shutdown discharge behavior. |
| Torex XC6206P332MR | 300mA rating, 250mV dropout at 300mA, 40µVRMS noise, SOT-23-5 package - higher current but higher noise and dropout. | Better for higher-current loads; less suitable for ultra-low-noise analog rails or tight dropout margins. | Choose XC6206P332MR only if >150mA output is required and 30µVRMS noise is not critical. |
Compared with MAX8877EUK33, the MAX8878EUK33 adds essential auto-discharge for systems with output capacitance, while XC6206P332MR trades noise and dropout performance for higher current capacity - making MAX8878EUK33 optimal for precision 3.3V battery-powered analog/digital co-supply applications.
Availability
MAX8878EUK33 is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, palmtop computers, and electronic planners 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) designs high-performance analog, mixed-signal, and power-management ICs for demanding industrial, communications, and consumer applications.
The MAX8877/MAX8878 product line delivers ultra-low-noise, low-quiescent-current LDOs optimized for battery-powered portable electronics where runtime, signal integrity, and board space are critical constraints.
FAQ
What is the output voltage tolerance of the MAX8878EUK33 over temperature and load?
The MAX8878EUK33 provides a factory-preset 3.3V output with ±1.4% accuracy across the full operating range of -40°C to +85°C and load currents from 0.1mA to 120mA. At 25°C and 0.1mA load, tolerance tightens to ±1.4%; worst-case deviation remains within specification under all validated conditions per the datasheet's Electrical Characteristics table.
Does the MAX8878EUK33 require external components to operate stably?
Yes - the MAX8878EUK33 requires three external capacitors: a ≥1µF ceramic CIN from IN to GND, a ≥3.3µF ceramic COUT from OUT to GND (due to 3.3V output), and a 0.01µF ceramic CBP from BP to GND. These ensure stability, low noise, and proper transient response; omitting any compromises regulation integrity.
How does the auto-discharge function work in the MAX8878EUK33?
When the SHDN pin is driven low, the MAX8878EUK33 activates an internal 300Ω discharge path between OUT and GND. This actively pulls the output voltage to ground within microseconds, preventing residual charge from causing unintended behavior in downstream circuitry - a feature absent in the MAX8877EUK33 variant.
Can the MAX8878EUK33 be used with input voltages below 2.5V?
No - the MAX8878EUK33 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, consider alternative regulators designed for ultra-low VIN.
What thermal derating applies to the MAX8878EUK33 in its SOT23-5 thin package?
The MAX8878EUK33 in the thin SOT23-5 package has a junction-to-board thermal resistance (θJB) of 110°C/W and a maximum continuous power dissipation of 727mW at +70°C ambient. Above +70°C, power must be derated at 9.1mW/°C - e.g., at +85°C ambient, max dissipation drops to 591mW.
MAX8878EUK33 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):
- 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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