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Analog Devices Inc./Maxim Integrated MAX8878EUK29+
- Part No.:
- MAX8878EUK29+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8878EUK29+.pdf
- Description:
- IC REG LINEAR 2.9V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,204
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Product details
Overview
MAX8878EUK29+ from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.84V preset output, 150mA max load, 165mV dropout at full load, and 30µVRMS output noise. It features internal P-channel MOSFET pass transistor, 10nA shutdown current, and auto-discharge functionality - designed for space-constrained battery-powered systems such as handheld instruments and PCMCIA cards.
For engineers reviewing the MAX8878EUK29+ datasheet, MAX8878EUK29+ pinout, MAX8878EUK29+ application, or MAX8878EUK29+ equivalent, key selection criteria include dropout performance at 150mA, BP-capacitor–dependent noise reduction, thermal shutdown behavior at +155°C, and compatibility with SOT23-5 '2982 footprint layouts in portable power rails.
Technical Context
The MAX8878EUK29+ uses an internal 1.25V bandgap reference and error amplifier to regulate output against load and line variations, with feedback provided by an on-die resistor divider. Its P-channel MOSFET pass element delivers 1.1Ω typical RDS(ON), enabling stable regulation down to 165mV VIN–VOUT differential at 150mA.
It integrates reverse-battery protection limiting reverse current to 1mA, thermal shutdown at +155°C with 15°C hysteresis, and current limiting set between 160mA (min) and 390mA (max). The MAX8878 variant adds active output discharge via a 300Ω internal resistance when SHDN is asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.84V ±1.4% (factory-preset; no external resistors required) |
| Max Output Current | 150mA continuous; supports peak loads without thermal shutdown under proper PCB layout |
| Dropout Voltage | 165mV at 150mA (enables operation down to 3.004V input for 2.84V output) |
| Output Noise | 30µVRMS (10Hz–100kHz, with 0.01µF BP cap and 10µF COUT) |
| Quiescent Current | 100µA over full load range and temperature (−40°C to +85°C), including dropout condition |
| Shutdown Current | 10nA logic-controlled shutdown; MAX8878EUK29+ discharges VOUT to GND via 300Ω path |
| Thermal Shutdown | Triggers at +155°C junction temperature; restarts after 15°C cooldown (hysteresis) |
Pinout & Package
MAX8878EUK29+ is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), compatible with industry-standard '2982 footprint. The GND pin serves dual role as electrical ground and thermal heatsink - requires connection to large copper area for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply rail | Accepts 2.5V–6.5V; bypass with ≥1µF ceramic capacitor to GND for stability and line-transient suppression |
| 2 GND | Ground reference & thermal path | Must be soldered to large PCB copper area to dissipate heat; critical for maintaining < +150°C junction temp at 150mA |
| 3 SHDN | Active-low enable/disable control | Logic low (≤0.4V) enables 10nA shutdown; on MAX8878EUK29+, initiates active VOUT discharge to GND |
| 4 BP | Bypass for reference noise reduction | Connects to 0.01µF ceramic capacitor; forms 80Hz low-pass filter to reduce output voltage noise to 30µVRMS |
| 5 OUT | Regulated output | Delivers up to 150mA at 2.84V; requires ≥1µF (VOUT ≥2.5V) or ≥3.3µF (VOUT <2.5V) output capacitor with <0.2Ω ESR |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass transistor | Eliminates base-drive current loss; maintains 100µA quiescent current across all load conditions including dropout |
| Auto-discharge function | 300Ω internal discharge path pulls VOUT to GND within microseconds of SHDN assertion - prevents floating outputs in sleep modes |
| Reverse battery protection | Blocks reverse current to ≤1mA if VIN or SHDN falls below GND - protects circuitry during incorrect battery insertion |
| Low-noise architecture | 30µVRMS output noise achieved via BP pin filtering and optimized internal error amplifier design - suitable for RF and precision analog rails |
| Thermal overload protection | Shuts down at +155°C junction temp and auto-restarts after 15°C cooldown - prevents permanent damage during sustained overload |
Applications
| Handheld Instrument Power | PCMCIA Card Regulation |
|---|---|
|
Use Scenario: Portable multimeter or data logger powered by single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary 2.84V LDO supplying microcontroller, ADC, and display driver from varying battery voltage. Use Value: 165mV dropout extends usable battery life to ~3.004V; 30µVRMS noise avoids ADC quantization errors. |
Use Scenario: PCMCIA modem card requiring clean, stable 2.84V rail independent of host bus voltage fluctuations. IC Role / Device Role / Timing Role: Local regulation stage decoupling card from noisy 3.3V or 5V host supply. Use Value: 63dB PSRR at low frequencies suppresses host-supply ripple; SOT23-5 footprint fits tight card-edge layouts. |
| Cordless Phone Base Station | Electronic Planner Supply |
|
Use Scenario: Low-power standby mode in DECT cordless phone base station with periodic wake-up bursts. IC Role / Device Role / Timing Role: Always-on 2.84V supply for real-time clock and wake-up controller. Use Value: 10nA shutdown current minimizes battery drain during weeks-long standby; auto-discharge prevents leakage into downstream circuits. |
Use Scenario: Palmtop organizer running on coin-cell or AAA batteries with intermittent high-current LCD refresh. IC Role / Device Role / Timing Role: Main system regulator delivering 2.84V to processor and memory during active use. Use Value: 150mA capability supports brief LCD backlight pulses; 100µA quiescent current preserves battery life during idle periods. |
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 |
|---|---|---|---|
| MAX8877EUK29+ | No auto-discharge; identical pinout, specs, and package - differs only in SHDN behavior | Suitable where output discharge is unnecessary or handled externally | Select MAX8877EUK29+ if system does not require active VOUT pull-down during shutdown |
| MCP1700T-2802E/TT | 250mA rating, 600mV dropout at 250mA, 17µVRMS noise, SOT23-3 package (no BP pin) | Lacks BP-based noise filtering and auto-discharge; simpler layout but higher noise and no discharge path | Choose MCP1700T-2802E/TT only for cost-sensitive, non-noise-critical 2.8V applications without shutdown discharge needs |
Compared with MAX8878EUK29+, MAX8877EUK29+ offers identical regulation performance but omits active discharge, while MCP1700T-2802E/TT trades noise performance and discharge capability for higher current and lower cost in a 3-pin package - requiring external noise mitigation and external discharge circuitry.
Availability
MAX8878EUK29+ is available at Aetrix Electronics and suitable for handheld instrument power, PCMCIA card regulation, cordless phone base stations, and electronic planner supply requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8878EUK29+ 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, communications, and portable applications.
The MAX8877/MAX8878 product line delivers ultra-low-noise, low-quiescent-current LDOs targeting battery-powered devices where runtime, signal integrity, and compact layout are critical - especially in telecom and portable instrumentation.
FAQ
What is the exact output voltage tolerance of the MAX8878EUK29+?
The MAX8878EUK29+ has a factory-preset output voltage of 2.84V with ±1.4% accuracy over temperature (−40°C to +85°C) and load (0.1mA to 120mA). This specification is guaranteed per the datasheet's Electrical Characteristics table and applies directly to the MAX8878EUK29+ without external trimming components.
Does the MAX8878EUK29+ require an external BP capacitor, and what happens if it is omitted?
Yes, the MAX8878EUK29+ requires a 0.01µF ceramic capacitor on the BP pin to achieve its specified 30µVRMS output noise. Omitting it increases output noise significantly - measurements show >100µVRMS without BP bypass - due to unfiltered reference noise coupling into the error amplifier.
How does the auto-discharge function operate in the MAX8878EUK29+ during shutdown?
When SHDN is pulled low, the MAX8878EUK29+ activates an internal 300Ω discharge path between OUT and GND, pulling the output voltage to ground within microseconds. This prevents residual charge from interfering with downstream logic states or causing unintended wake-up events in battery-powered systems using the MAX8878EUK29+.
Can the MAX8878EUK29+ be used with input voltages below 2.5V?
No - the absolute minimum input voltage for the MAX8878EUK29+ is 2.5V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Operation below this threshold risks improper regulation, increased dropout, or failure to maintain 2.84V output; the device is not characterized or guaranteed for sub-2.5V operation.
What thermal derating applies to the MAX8878EUK29+ in SOT23-5 regular package?
The MAX8878EUK29+ in SOT23-5 regular package has a thermal derating factor of 7.1mW/°C above +70°C ambient, with maximum continuous power dissipation rated at 571mW at TA = +70°C. Effective thermal management requires direct GND pin connection to a large PCB copper area to maintain junction temperature below +150°C.
MAX8878EUK29+ 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):
- 2.9V
- 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
MAX8878EUK29+ FAQ
1.How can I place an order for MAX8878EUK29+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EUK29+ 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 MAX8878EUK29+ reliable?
The price and inventory of MAX8878EUK29+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EUK29+ is usually 5 days.
3.What payment methods are accepted for MAX8878EUK29+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EUK29+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EUK29+?
MAX8878EUK29+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EUK29+ 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 MAX8878EUK29+?
For technical support, including MAX8878EUK29+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EUK29+ requirements.
6.How does Aetrix verify that MAX8878EUK29+ is sourced from the original manufacturer or authorized distributors?
All MAX8878EUK29+ 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 MAX8878EUK29+ meets industry standards.
7.What is the process for return or replacement of MAX8878EUK29+?
All MAX8878EUK29+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EUK29+, 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 MAX8878EUK29+ part is unused and in its original packaging.
Return procedure for MAX8878EUK29+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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