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Analog Devices Inc./Maxim Integrated MAX8878EUK18+T
- Part No.:
- MAX8878EUK18+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8878EUK18+T.pdf
- Description:
- IC REG LINEAR 1.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,285
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Product details
Overview
MAX8878EUK18+T from Maxim Integrated is a low-noise, low-dropout linear regulator with 1.8V preset output, 150mA maximum output current, 165mV dropout at full load, 30µVRMS output noise, and 100µA operating supply current - designed for battery-powered portable electronics requiring stable, ultra-low-noise power delivery.
For engineers reviewing the MAX8878EUK18+T datasheet, MAX8878EUK18+T pinout, MAX8878EUK18+T application, or MAX8878EUK18+T equivalent, key selection criteria include its SOT23-5 regular package, auto-discharge shutdown function, ±1.4% output voltage accuracy, reverse battery protection, and compatibility with 1µF ceramic output capacitors for VOUT ≥ 2.5V (note: 1.8V requires 3.3µF).
Technical Context
The MAX8878EUK18+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) to achieve low dropout and load-independent quiescent current. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
It integrates thermal shutdown (155°C trip, 15°C hysteresis), short-circuit protection, 10nA logic-controlled shutdown, and - uniquely versus MAX8877 - active output discharge via a 300Ω internal resistance when SHDN is asserted. The BP pin enables noise reduction via a 0.01µF capacitor forming an 80Hz low-pass filter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V ±1.4% (factory-preset; no external resistors required) |
| Max Output Current | 150mA continuous; supports handheld devices with burst loads |
| Dropout Voltage | 165mV at 150mA (enables operation down to VIN = 1.965V) |
| Output Noise | 30µVRMS (10Hz–100kHz); suitable for RF and precision analog circuitry |
| Quiescent Current | 100µA (load- and dropout-independent; extends battery life) |
| Shutdown Current | 10nA (logic-low SHDN); enables deep-sleep modes in portable systems |
| Input Voltage Range | 2.5V to 6.5V; compatible with single Li-ion, dual Alkaline, or regulated DC supplies |
Pinout & Package
MAX8878EUK18+T is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical reference and thermal path. PCB layout must use a large copper pour under the GND pad for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.5V–6.5V; requires 1µF bypass to GND for stability and line-transient suppression |
| 2 GND | Ground and thermal pad | Primary return path and heatsink; must connect to large PCB ground plane |
| 3 SHDN | Active-low shutdown control | Pulls output to ground via 300Ω resistor when low (MAX8878-specific auto-discharge) |
| 4 BP | Bypass reference node | Connects to 0.01µF ceramic capacitor to reduce reference noise and total output noise |
| 5 OUT | Regulated output | Delivers 1.8V up to 150mA; requires 3.3µF ceramic capacitor (ESR < 0.2Ω) for stability at 1.8V |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on shutdown | 300Ω internal discharge path actively pulls OUT to GND - eliminates residual voltage during sleep, critical for system-level power sequencing |
| Reverse battery protection | Limits reverse current to ≤1mA if VIN or SHDN falls below GND - prevents damage in misinserted battery scenarios |
| P-channel MOSFET pass element | 1.1Ω RDS(ON); eliminates base-drive current loss, enabling constant 100µA IQ across all load and dropout conditions |
| Low-noise BP filtering | 0.01µF capacitor at BP forms 80Hz RC filter with internal 200kΩ resistor - reduces reference noise contribution to total output noise |
| Thermal shutdown with hysteresis | 155°C trip / 140°C recovery; enables safe pulsed operation during sustained overload without latch-off |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering RF transceiver LDO rails and baseband processor I/O banks in GSM/EDGE handsets with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Primary 1.8V LDO delivering clean, low-noise bias to sensitive RF front-end and digital I/O domains. Use Value: 30µVRMS noise and 165mV dropout enable full battery utilization (down to ~1.96V) while maintaining RF EVM and digital timing margins. |
Use Scenario: Providing regulated 1.8V supply to PCMCIA card controllers and interface logic in laptop expansion slots. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring stable voltage during hot-plug insertion and dynamic bus loading. Use Value: Auto-discharge clears residual output voltage upon card ejection, preventing backfeed into host controller and meeting PCMCIA power sequencing requirements. |
| Palmtop Computers | Electronic Planners |
|
Use Scenario: Supplying core logic voltage to ARM-based palmtop SoCs with intermittent high-current bursts during display refresh or data sync. IC Role / Device Role / Timing Role: Low-quiescent LDO supporting deep-sleep states while enabling fast wake-up via minimal startup delay. Use Value: 100µA IQ (independent of load/dropout) maximizes standby time; 12mV load transient response (0→50mA) maintains CPU clock stability during activity bursts. |
Use Scenario: Powering real-time clock (RTC), SRAM backup, and microcontroller peripherals in battery-critical organizer devices. IC Role / Device Role / Timing Role: Always-on LDO with ultra-low shutdown current preserving coin-cell or primary battery life over multi-year deployments. Use Value: 10nA shutdown current minimizes self-discharge; ±1.4% output accuracy ensures RTC timing integrity and memory retention voltage compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8877EUK18+T | No auto-discharge; identical pinout, specs, and package - same 1.8V output, 150mA, 30µVRMS noise, but OUT floats in shutdown | Suitable where output hold is acceptable (e.g., non-sequenced subsystems), but not for hot-swap or strict power-rail collapse requirements | Select MAX8877EUK18+T only if auto-discharge is unnecessary and cost sensitivity favors the non-8878 variant |
| MCP1700T-1802E/MB | 250mA rating, 6µA IQ, 600mV dropout at 250mA; SOT23-3, no BP or SHDN pins - simpler but less feature-rich | Lacks shutdown control and noise-reduction BP pin; used in cost-sensitive, low-complexity applications without sequencing needs | Choose MCP1700T-1802E/MB for basic 1.8V regulation where ultra-low IQ dominates over noise performance and control features |
Compared with MAX8877EUK18+T, the MAX8878EUK18+T adds mandatory auto-discharge for safe power-down sequencing; versus MCP1700T-1802E/MB, it trades higher IQ for dramatically lower noise, precise accuracy, and integrated protection - making it optimal for RF and portable systems demanding clean, controllable 1.8V rails.
Availability
MAX8878EUK18+T 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 traceable sourcing.
Supply support for MAX8878EUK18+T 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-dropout LDOs optimized for battery-powered portable electronics - emphasizing extended runtime, RF-clean power, and robust fault protection in space-constrained SOT23 packages.
FAQ
What is the output voltage tolerance of the MAX8878EUK18+T over temperature and load?
The MAX8878EUK18+T guarantees ±1.4% output voltage accuracy across -40°C to +85°C and 0.1mA to 120mA load range for 1.8V output. At 25°C and 0.1mA load, tolerance tightens to ±1.4%; worst-case drift remains within specification limits per the Electrical Characteristics table. This accuracy ensures reliable operation of 1.8V I/O interfaces and memory in portable systems.
Does the MAX8878EUK18+T require an external BP capacitor, and what happens if it's omitted?
Yes, the MAX8878EUK18+T requires a 0.01µF ceramic capacitor between BP and GND to achieve its specified 30µVRMS output noise. Omitting it increases output noise significantly - measurements show >2× higher RMS noise without BP bypass. The BP pin connects internally to the reference amplifier; the capacitor stabilizes the reference node and suppresses high-frequency noise coupling.
How does the auto-discharge function work in the MAX8878EUK18+T during shutdown?
When SHDN is pulled low, the MAX8878EUK18+T activates an internal 300Ω discharge path from OUT to GND, actively pulling the output voltage to ground within microseconds. This differs from the MAX8877, which leaves OUT floating. The discharge path is explicitly confirmed in the Electrical Characteristics table and functional diagram - critical for systems requiring rail collapse before entering low-power states.
What output capacitor value is required for stable operation of the MAX8878EUK18+T at 1.8V?
For stable operation at 1.8V output, the MAX8878EUK18+T requires a minimum 3.3µF ceramic capacitor on OUT with ESR < 0.2Ω. This is explicitly stated in the Pin Description section and Applications Information - unlike higher-output-voltage variants (≥2.5V) that specify 1µF. Using 1µF at 1.8V risks instability, especially across temperature and load extremes.
Is the MAX8878EUK18+T pin-compatible with the industry-standard '2982 regulator?
Yes, the MAX8878EUK18+T is explicitly documented as pin-compatible with the industry-standard '2982 family in the General Description and Pin Configuration sections. It shares identical SOT23-5 pinout (IN, GND, SHDN, BP, OUT), enabling drop-in replacement in existing '2982 designs - provided the auto-discharge behavior and 1.8V output meet system requirements.
MAX8878EUK18+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- 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
MAX8878EUK18+T FAQ
1.How can I place an order for MAX8878EUK18+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8878EUK18+T 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 MAX8878EUK18+T reliable?
The price and inventory of MAX8878EUK18+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8878EUK18+T is usually 5 days.
3.What payment methods are accepted for MAX8878EUK18+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8878EUK18+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8878EUK18+T?
MAX8878EUK18+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8878EUK18+T 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 MAX8878EUK18+T?
For technical support, including MAX8878EUK18+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8878EUK18+T requirements.
6.How does Aetrix verify that MAX8878EUK18+T is sourced from the original manufacturer or authorized distributors?
All MAX8878EUK18+T 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 MAX8878EUK18+T meets industry standards.
7.What is the process for return or replacement of MAX8878EUK18+T?
All MAX8878EUK18+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8878EUK18+T, 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 MAX8878EUK18+T part is unused and in its original packaging.
Return procedure for MAX8878EUK18+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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