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Analog Devices Inc./Maxim Integrated MAX8878EUK28+
- Part No.:
- MAX8878EUK28+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8878EUK28+.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,776
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Product details
Overview
MAX8878EUK28+ from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.8V preset output, 150mA maximum output current, 165mV dropout at full load, 30µVRMS output noise, and 10nA logic-controlled shutdown. It uses an internal P-channel MOSFET pass device and operates from 2.5V to 6.5V input, serving as a precision power source for battery-powered portable electronics.
For engineers reviewing the MAX8878EUK28+ datasheet, MAX8878EUK28+ pinout, MAX8878EUK28+ application, or MAX8878EUK28+ equivalent, key selection criteria include dropout performance at 150mA, auto-discharge functionality during shutdown, BP-capacitor–dependent noise reduction, and SOT23-5 regular package compatibility with industry-standard '2982 footprints.
Technical Context
The MAX8878EUK28+ integrates a 1.25V bandgap reference, error amplifier, and P-channel MOSFET pass transistor with 1.1Ω typical RDS(ON). Its feedback loop uses an internal resistor divider to maintain 2.8V output with ±1.4% accuracy across temperature and load.
It features dedicated BP pin with 200kΩ internal resistor forming an 80Hz low-pass filter when paired with 0.01µF capacitor, enabling 30µVRMS noise performance. The MAX8878 variant adds active output discharge via 300Ω internal resistance during SHDN assertion - a capability absent in MAX8877.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8V preset (±1.4% over -40°C to +85°C), factory-trimmed, no external resistors required |
| Max Output Current | 150mA continuous; current limit activates at ≥160mA to protect against shorts |
| Dropout Voltage | 165mV at 150mA load - enables operation down to VIN = 2.965V while sustaining regulated 2.8V |
| Output Noise | 30µVRMS (10Hz–100kHz) with 0.01µF BP cap and 10µF COUT - suitable for RF and precision analog circuitry |
| Quiescent Current | 100µA over full load range and dropout condition - ensures minimal battery drain in active mode |
| Shutdown Current | 10nA typical - reduces system standby power to negligible levels; MAX8878 discharges VOUT to GND |
| Input Voltage Range | 2.5V to 6.5V - supports single-cell Li-ion (2.7–4.2V), two-cell alkaline (2.4–3.2V), and 3.3V/5V rails |
Pinout & Package
MAX8878EUK28+ is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with thermal pad connected to GND for enhanced power dissipation. Pin 2 (GND) serves dual role as electrical ground and primary heatsink - requires soldering to large PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Regulator input supply | Accepts 2.5V–6.5V; bypass with 1µF ceramic capacitor to GND for stability and line-transient suppression |
| 2 - GND | Ground reference and thermal path | Electrical return and primary heat conduction path; must connect to large PCB ground plane |
| 3 - SHDN | Active-low enable/disable control | Logic low (≤0.4V) disables regulator and triggers auto-discharge of VOUT to GND (MAX8878 only) |
| 4 - BP | Bypass node for reference noise filtering | Connects to 0.01µF ceramic capacitor to reduce output voltage noise; forms 80Hz RC filter with 200kΩ internal resistor |
| 5 - OUT | Regulated output terminal | Delivers up to 150mA at 2.8V; requires 1µF (≥2.5V) or 3.3µF (<2.5V) output capacitor with ESR <0.2Ω for stability |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on shutdown | 300Ω internal discharge path actively pulls VOUT to GND within microseconds - prevents floating outputs in power-managed systems |
| P-channel MOSFET pass element | Eliminates base-drive current; maintains 100µA quiescent current independent of load or dropout state - extends battery life |
| Reverse battery protection | Limits reverse supply current to ≤1mA if VIN or SHDN falls below GND - protects IC and upstream circuitry without external diodes |
| Thermal shutdown with hysteresis | Shuts down at +155°C junction temperature and re-enables after 15°C cooldown - prevents thermal runaway during sustained overload |
| Pin-compatible with '2982 | Direct replacement for legacy regulators in existing SOT23-5 layouts - no PCB redesign needed for upgrade to lower noise/dropout |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering RF transceivers and baseband processors in GSM/CDMA handsets with single Li-ion cell. IC Role / Device Role / Timing Role: Primary LDO delivering clean 2.8V bias to sensitive analog front-end and PLL circuits. Use Value: 30µVRMS noise and 165mV dropout allow uninterrupted operation down to 2.965V input - maximizing usable battery capacity. |
Use Scenario: Providing regulated 2.8V supply to memory and I/O controllers in hot-pluggable PCMCIA Type II cards. IC Role / Device Role / Timing Role: Standby-power LDO with 10nA shutdown current and fast wake-up for instant card recognition. Use Value: Auto-discharge ensures VOUT collapses rapidly upon ejection, preventing back-driving host bus or data corruption. |
| Palmtop Computers | Electronic Planners |
|
Use Scenario: Supplying core logic and display driver ICs in ARM-based palmtops powered by dual AA/AAA cells. IC Role / Device Role / Timing Role: Main system LDO with reverse-battery protection to survive accidental cell reversal during battery swaps. Use Value: 100µA quiescent current and thermal shutdown enable reliable long-term operation without forced ventilation or derating. |
Use Scenario: Regulating power to real-time clock (RTC), SRAM, and touch controller in low-power electronic organizers. IC Role / Device Role / Timing Role: Always-on LDO maintaining 2.8V rail during deep-sleep modes with sub-100nA effective system leakage. Use Value: BP-capacitor–filtered reference ensures RTC accuracy remains unaffected by switching noise from other system blocks. |
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 |
|---|---|---|---|
| MAX8877EUK28+ | No auto-discharge; identical pinout, noise, dropout, and quiescent current | Suitable where output discharge is not required; lower cost where MAX8878-specific feature is unused | Select MAX8877EUK28+ only if auto-discharge is unnecessary - avoids paying premium for unused functionality |
| MCP1700T-2802E/TT | 250mA rating, 6µA quiescent current, no BP pin or auto-discharge; SOT23-3 package | Higher current but lacks noise optimization and shutdown discharge - better for ultra-low-IQ non-RF apps | Choose MCP1700T-2802E/TT only for cost-sensitive, non-noise-critical designs requiring >150mA or <10µA IQ |
Compared with MAX8877EUK28+, the MAX8878EUK28+ adds critical auto-discharge for safe power sequencing; versus MCP1700T-2802E/TT, it delivers 5× lower output noise and guaranteed 150mA performance in the same footprint - making it optimal for RF and precision analog subsystems.
Availability
MAX8878EUK28+ is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, palmtop computers, and electronic planners requiring stable component supply, long-lifecycle support, and guaranteed parametric compliance over industrial temperature range (-40°C to +85°C).
Supply support for MAX8878EUK28+ 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, low dropout, and intelligent power control - targeting cellular, handheld, and PC-card markets where efficiency and signal integrity are critical.
FAQ
What is the output voltage tolerance of the MAX8878EUK28+ over temperature and load?
The MAX8878EUK28+ provides a factory-preset 2.8V output with ±1.4% accuracy over the full operating range of -40°C to +85°C and 0.1mA to 120mA load current. This specification is guaranteed by production testing and statistical correlation - ensuring consistent regulation without external trimming components in the target applications.
Does the MAX8878EUK28+ require an external BP capacitor, and what happens if it's omitted?
Yes, the MAX8878EUK28+ requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µVRMS output noise. Omitting this capacitor increases output noise significantly - typically exceeding 100µVRMS - due to unfiltered reference voltage noise. The BP pin must not be left floating or shorted to GND.
How does the auto-discharge function operate in the MAX8878EUK28+ during shutdown?
When SHDN is pulled low, the MAX8878EUK28+ activates an internal 300Ω discharge path between OUT and GND, collapsing the output voltage rapidly. This behavior is exclusive to the MAX8878 family - the MAX8877 variants lack this feature. Discharge time depends on output capacitance but typically completes within tens of microseconds for ≤1µF loads.
Can the MAX8878EUK28+ be used with input voltages below 2.5V?
No - the absolute minimum input voltage for the MAX8878EUK28+ 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 2.8V output. For sub-2.5V inputs, alternative regulators such as the MAX1726 series must be considered.
What thermal considerations apply to the MAX8878EUK28+ in SOT23-5 regular package?
The MAX8878EUK28+ in SOT23-5 regular package has θJB = 140°C/W and a 571mW maximum power dissipation at +70°C ambient. To avoid thermal shutdown, the GND pin must be soldered to a large PCB copper area acting as a heatsink. Derating is required above +70°C - 7.1mW per °C - and junction temperature must remain below +150°C for reliable operation.
MAX8878EUK28+ 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):
- 2.8V
- 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
MAX8878EUK28+ FAQ
1.How can I place an order for MAX8878EUK28+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EUK28+ 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 MAX8878EUK28+ reliable?
The price and inventory of MAX8878EUK28+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EUK28+ is usually 5 days.
3.What payment methods are accepted for MAX8878EUK28+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EUK28+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EUK28+?
MAX8878EUK28+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EUK28+ 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 MAX8878EUK28+?
For technical support, including MAX8878EUK28+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EUK28+ requirements.
6.How does Aetrix verify that MAX8878EUK28+ is sourced from the original manufacturer or authorized distributors?
All MAX8878EUK28+ 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 MAX8878EUK28+ meets industry standards.
7.What is the process for return or replacement of MAX8878EUK28+?
All MAX8878EUK28+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EUK28+, 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 MAX8878EUK28+ part is unused and in its original packaging.
Return procedure for MAX8878EUK28+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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