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Analog Devices Inc./Maxim Integrated MAX8877EUK38-T
- Part No.:
- MAX8877EUK38-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8877EUK38-T.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX8877EUK38-T from Maxim Integrated is a low-noise, low-dropout linear regulator with 3.8V preset output voltage, 150mA maximum output current, 165mV dropout at full load, and 30µVRMS output noise. It features an internal P-channel MOSFET pass transistor, 100µA operating supply current (independent of load or dropout), and logic-controlled shutdown with 10nA quiescent current - designed for battery-powered portable electronics requiring stable, clean power under tight input headroom constraints.
For engineers reviewing the MAX8877EUK38-T datasheet, MAX8877EUK38-T pinout, MAX8877EUK38-T application, or MAX8877EUK38-T equivalent, key selection criteria include dropout performance at 150mA, output voltage accuracy (±1.4%), BP-capacitor–dependent noise reduction, thermal shutdown behavior (155°C), and SOT23-5 regular package compatibility with industry-standard '2982 footprints.
Technical Context
The MAX8877EUK38-T uses a 1.25V bandgap reference and error amplifier to regulate output via an internal P-channel MOSFET pass transistor (typical RDS(ON) = 1.1Ω). Its feedback network is fully internal, eliminating external resistor networks and ensuring ±1.4% output voltage accuracy across temperature and load.
It integrates reverse-battery protection (limits reverse current to 1mA), thermal shutdown with 15°C hysteresis, short-circuit protection, and a dedicated BP pin for noise filtering via a 0.01µF ceramic capacitor - enabling 30µVRMS integrated noise (10Hz–100kHz) without requiring complex external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.8V preset (±1.4% accuracy over -40°C to +85°C); no external resistors required. |
| Max Output Current | 150mA continuous; current limit minimum 160mA ensures safe operation into short circuits. |
| Dropout Voltage | 165mV at 150mA load; enables operation down to VIN = 3.965V for full-rated output. |
| Output Noise | 30µVRMS (10Hz–100kHz) with 0.01µF BP capacitor; supports noise-sensitive analog/RF circuitry. |
| Quiescent Current | 100µA during regulation (load-independent); maintains efficiency in light-load and dropout conditions. |
| Shutdown Current | 10nA logic-controlled shutdown; extends battery life in standby modes of portable devices. |
| Input Voltage Range | 2.5V to 6.5V; compatible with single Li-ion, Li-polymer, and dual Alkaline/NiMH battery stacks. |
Pinout & Package
MAX8877EUK38-T is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with exposed pad not electrically connected. The GND pin serves as both circuit return and primary thermal path - requires soldering to a large PCB copper area for optimal power dissipation (θJB = 140°C/W).
| 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 immunity. |
| 2. GND | Ground reference and thermal sink | Electrical ground return; must be connected to large PCB copper area to manage thermal dissipation up to 571mW. |
| 3. SHDN | Active-low shutdown control | Logic low (≤0.4V) disables regulator and reduces supply current to 10nA; connect to IN for always-on operation. |
| 4. BP | Bypass for reference noise reduction | Connects to internal 200kΩ resistor forming 80Hz low-pass filter; 0.01µF ceramic capacitor reduces output noise to 30µVRMS. |
| 5. OUT | Regulated output | Delivers up to 150mA at 3.8V; bypass with ≥1µF (ESR <0.2Ω) ceramic capacitor for VOUT ≥2.5V applications. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass transistor | Eliminates base-drive current loss; enables constant 100µA IQ across all load and dropout conditions. |
| Reverse battery protection | Blocks reverse current to ≤1mA when VIN or SHDN falls below GND - prevents damage in miswired battery compartments. |
| Thermal shutdown with hysteresis | Shuts down at 155°C junction temperature and re-enables only after cooling by 15°C - prevents thermal runaway during sustained overload. |
| Internal feedback divider | Enables factory-preset 3.8V output with ±1.4% accuracy; removes external resistor tolerance and layout sensitivity. |
| Low-noise BP pin architecture | 0.01µF capacitor on BP reduces integrated output noise to 30µVRMS - critical for powering ADCs, RF synthesizers, and precision sensors. |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering RF transceiver ICs and baseband processors in GSM/CDMA handsets with single-cell Li-ion battery input. IC Role / Device Role / Timing Role: Primary LDO delivering clean 3.8V bias to sensitive analog front-end circuitry while maintaining regulation down to end-of-life battery voltage (~3.2V). Use Value: 165mV dropout ensures >3.6V output until battery drops below 3.965V; 30µVRMS noise prevents phase noise degradation in local oscillators. |
Use Scenario: Providing regulated 3.8V supply to memory controllers and interface logic in hot-pluggable PCMCIA Type II cards. IC Role / Device Role / Timing Role: Standby-power LDO with 10nA shutdown mode, enabling fast wake-up and zero-current draw when card is ejected. Use Value: Pin-compatible replacement for '2982-based designs; 100µA IQ minimizes standby drain on host system's auxiliary rail. |
| Hand-Held Instruments | Electronic Planners |
|
Use Scenario: Supplying precision analog signal chain (op-amps, ADCs, DACs) in portable multimeters and data loggers powered by AA/AAA batteries. IC Role / Device Role / Timing Role: Low-noise, high-accuracy voltage source ensuring stable reference and bias rails independent of battery discharge curve. Use Value: ±1.4% output accuracy and <0.04%/mA load regulation maintain measurement integrity across 0–150mA load swings and battery voltage decay. |
Use Scenario: Regulating power to microcontroller core and LCD driver in battery-operated PDAs and organizers with tight board space. IC Role / Device Role / Timing Role: Compact SOT23-5 LDO replacing larger SO-8 regulators while delivering identical 3.8V output with improved thermal performance. Use Value: GND pin doubles as thermal pad - enables 571mW dissipation without heatsink; supports 150mA peak loads during display refresh bursts. |
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 |
|---|---|---|---|
| MAX8878EUK38-T | Includes auto-discharge function (300Ω pull-down on OUT during shutdown); otherwise identical specs and pinout. | Required where rapid output discharge is needed to prevent back-powering downstream circuitry during sleep mode. | Select MAX8878EUK38-T only if active output discharge is mandatory; MAX8877EUK38-T is preferred for lowest shutdown current (10nA vs. 0.2µA). |
| MCP1700T-3802E/MB | Higher dropout (280mV @ 150mA), higher noise (60µVRMS), but lower IQ (1.6µA no-load); SOT23-3, not pin-compatible. | Acceptable for cost-sensitive, non-noise-critical applications where board redesign is feasible and 3.8V accuracy tolerance is relaxed. | Choose only if footprint change is acceptable and 165mV dropout/30µVRMS noise are not design-critical; MAX8877EUK38-T offers superior performance in constrained battery systems. |
Compared with MAX8878EUK38-T, the MAX8877EUK38-T provides lower shutdown current and simpler control (no auto-discharge), while differing from MCP1700T-3802E/MB in pin count, dropout, noise, and thermal performance - making it the optimal choice for space-constrained, noise-sensitive, battery-endurance–critical designs requiring exact '2982 pinout compatibility.
Availability
MAX8877EUK38-T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, and hand-held instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8877EUK38-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) 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 engineered specifically for ultra-low-noise, low-quiescent-current regulation in portable battery-powered systems - prioritizing dropout voltage, output accuracy, and thermal robustness in miniature SOT23-5 packages.
FAQ
What is the output voltage tolerance of the MAX8877EUK38-T over temperature and load?
The MAX8877EUK38-T delivers 3.8V with ±1.4% accuracy across the full operating range of -40°C to +85°C and for output currents from 0.1mA to 120mA. This specification is guaranteed by production testing and statistical correlation - meaning actual units will remain within this band without requiring external trimming or calibration.
Does the MAX8877EUK38-T require an external BP capacitor, and what happens if it's omitted?
Yes, the MAX8877EUK38-T requires a 0.01µF ceramic capacitor on the BP pin to achieve its specified 30µVRMS output noise. Without it, output noise increases significantly - typically exceeding 100µVRMS - due to unfiltered reference voltage noise. Omission also degrades PSRR above 1kHz and may cause instability under certain load transients.
Can the MAX8877EUK38-T operate with a 2.7V input while delivering 3.8V output?
No - the MAX8877EUK38-T cannot regulate 3.8V output from a 2.7V input. Its minimum input voltage is the sum of output voltage plus dropout: 3.8V + 0.165V = 3.965V minimum. At 2.7V input, the device enters dropout and cannot sustain regulated 3.8V output; it will follow the input minus pass transistor losses, yielding ~2.5V–2.6V at the OUT pin.
How does reverse battery protection work in the MAX8877EUK38-T, and what is its failure threshold?
The MAX8877EUK38-T monitors polarity on both IN and SHDN pins. If either falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to ≤1mA - protecting downstream components. This protection remains effective down to -7V reverse bias and is intrinsic to the IC's architecture; no external diodes or FETs are needed.
Is the MAX8877EUK38-T pin-compatible with the industry-standard '2982 regulator?
Yes - the MAX8877EUK38-T is explicitly designed as a pin-compatible upgrade to the industry-standard '2982 family. It uses identical SOT23-5 pinout (IN, GND, SHDN, BP, OUT), same footprint, and same mounting orientation. Engineers can drop it into existing '2982 layouts without PCB modification while gaining lower dropout, lower noise, and improved accuracy.
MAX8877EUK38-T 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):
- 3.8V
- 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
MAX8877EUK38-T FAQ
1.How can I place an order for MAX8877EUK38-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8877EUK38-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 MAX8877EUK38-T reliable?
The price and inventory of MAX8877EUK38-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8877EUK38-T is usually 5 days.
3.What payment methods are accepted for MAX8877EUK38-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8877EUK38-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8877EUK38-T?
MAX8877EUK38-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8877EUK38-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 MAX8877EUK38-T?
For technical support, including MAX8877EUK38-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8877EUK38-T requirements.
6.How does Aetrix verify that MAX8877EUK38-T is sourced from the original manufacturer or authorized distributors?
All MAX8877EUK38-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 MAX8877EUK38-T meets industry standards.
7.What is the process for return or replacement of MAX8877EUK38-T?
All MAX8877EUK38-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8877EUK38-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 MAX8877EUK38-T part is unused and in its original packaging.
Return procedure for MAX8877EUK38-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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