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Analog Devices Inc./Maxim Integrated MAX8877EUK39+T
- Part No.:
- MAX8877EUK39+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8877EUK39+T.pdf
- Description:
- IC REG LINEAR 3.9V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,893
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Product details
Overview
MAX8877EUK39+T from Maxim Integrated is a low-noise, low-dropout linear regulator with fixed 3.9V output, delivering up to 150mA from a 2.5V–6.5V input. It features 30µVRMS output noise, 165mV dropout at 150mA, ±1.4% output voltage accuracy, and 100µA operating supply current independent of load or dropout condition. It serves as a precision power source for battery-powered portable electronics requiring stable, clean voltage rails.
For engineers reviewing the MAX8877EUK39+T datasheet, MAX8877EUK39+T pinout, MAX8877EUK39+T application, or MAX8877EUK39+T equivalent, key selection criteria include dropout performance at full load, ultra-low quiescent current in active and shutdown modes, reverse-battery protection integrity, and BP-capacitor–dependent noise reduction behavior under varying load and temperature conditions.
Technical Context
The MAX8877EUK39+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling low dropout and eliminating base-drive current loss. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin, maintaining regulation without external resistors.
It integrates thermal shutdown (155°C trip, 15°C hysteresis), short-circuit protection, and reverse-battery protection limiting reverse current to 1mA. Unlike the MAX8878 variant, it lacks auto-discharge - shutdown reduces supply current to 10nA but leaves the output floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.9V ±1.4% over -40°C to +85°C - ensures stable rail for 3.3V/3.6V logic interfaces without external feedback. |
| Max Output Current | 150mA continuous - sufficient for RF front-ends, microcontroller cores, or sensor signal chains in compact handheld devices. |
| Dropout Voltage | 165mV at 150mA - enables operation down to 4.065V input when powering 3.9V loads, extending usable battery life in single-cell Li-ion systems. |
| Output Noise | 30µVRMS (10Hz–100kHz, CBP = 0.01µF, COUT = 10µF) - low enough to avoid interference in ADC references or RF synthesizer VCO supplies. |
| Quiescent Current | 100µA at full load and in dropout - constant across operating range, critical for long-term battery runtime in always-on subsystems. |
| Shutdown Current | 10nA typical - reduces system standby power to negligible levels, supporting multi-week shelf life in remote sensors. |
| Input Voltage Range | 2.5V to 6.5V - compatible with single-cell Li-ion (2.7–4.2V), LiFePO4 (2.0–3.6V with margin), and dual-cell alkaline (up to 3.2V fresh). |
Pinout & Package
MAX8877EUK39+T is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical reference and thermal path. The package supports soldering to PCB ground planes for enhanced thermal dissipation (θJB = 140°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Regulator input supply | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND for stability and line-transient suppression. |
| 2 - GND | Ground reference and thermal sink | Must connect to large copper area or ground plane to manage power dissipation up to 571mW at +70°C ambient. |
| 3 - SHDN | Active-low enable control | Pulled low to enter 10nA shutdown; pulled high (≥2.0V) or tied to IN for normal operation; no auto-discharge function. |
| 4 - BP | Bypass capacitor connection | Connects to 0.01µF ceramic capacitor to reduce reference noise; forms 80Hz low-pass filter with internal 200kΩ resistor. |
| 5 - OUT | Regulated output | Delivers up to 150mA; requires ≥1µF ceramic capacitor (ESR <0.2Ω) for VOUT ≥2.5V; stable with COUT ESR ≤1Ω at 150mA. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss, enabling 100µA quiescent current regardless of load or dropout - extends battery life vs. PNP-based regulators. |
| Reverse battery protection | Limits reverse current to ≤1mA when VIN or SHDN falls below GND - prevents damage during incorrect battery insertion in consumer handhelds. |
| Thermal shutdown with hysteresis | Shuts down at 155°C junction temperature and re-enables after cooling by 15°C - provides safe, self-recovering fault handling during sustained overload. |
| Low-noise BP pin architecture | 0.01µF capacitor at BP reduces output noise to 30µVRMS - avoids need for post-regulation LDO filtering in noise-sensitive analog signal paths. |
| Current limit protection | Guarantees ≥160mA minimum current limit (typ. 390mA) - allows safe short-circuit testing and prevents catastrophic failure during board-level faults. |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering baseband processor I/O banks and RF transceiver bias rails in GSM/EDGE handsets with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Primary 3.9V LDO supplying noise-sensitive RF sections and digital I/O, replacing switching regulators to avoid EMI coupling into antenna paths. Use Value: 30µVRMS noise and 165mV dropout preserve signal integrity and extend talk time by minimizing voltage headroom loss near battery end-of-life. |
Use Scenario: Providing regulated 3.9V to PCMCIA card controllers and interface logic in laptop expansion slots. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling host bus voltage, ensuring stable timing margins for CardBus data transfers. Use Value: 100µA quiescent current minimizes standby drain when cards are inserted but inactive; reverse-battery protection guards against hot-swap misinsertion. |
| Hand-Held Instruments | Electronic Planners |
|
Use Scenario: Supplying precision analog front-end (AFE) and microcontroller core in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Clean 3.9V rail for ADC reference buffers and op-amp signal conditioning stages requiring low PSRR and minimal ripple. Use Value: 63dB PSRR at low frequencies suppresses switching noise from shared DC-DC converters; BP pin enables <30µVRMS noise floor for 16-bit measurement accuracy. |
Use Scenario: Powering real-time clock (RTC), memory backup, and touch-screen controller in PDAs and early smartphones. IC Role / Device Role / Timing Role: Always-on LDO maintaining RTC voltage during main system sleep, with shutdown mode reducing leakage to 10nA. Use Value: Ultra-low shutdown current enables >3-year battery backup life using coin cells; ±1.4% output accuracy ensures reliable RTC oscillator frequency stability. |
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 |
|---|---|---|---|
| TPS76339DBVR | 3.9V fixed output, 150mA, 220mV dropout at 150mA, 50µVRMS noise, 85µA IQ - higher dropout and noise than MAX8877EUK39+T. | Lacks reverse-battery protection and thermal hysteresis; requires external shutdown pull-up. | Choose when cost sensitivity outweighs noise/dropout requirements and reverse protection is handled externally. |
| MCP1703T-3902E/MB | 3.9V fixed output, 250mA, 600mV dropout at 250mA, 30µVRMS noise, 4µA IQ - much lower quiescent current but significantly higher dropout. | No reverse-battery protection; rated only to +125°C junction, not automotive-grade. | Prefer for ultra-low-power wake-on-event systems where input voltage裕度 is ample and reverse polarity risk is absent. |
Compared with TPS76339DBVR and MCP1703T-3902E/MB, the MAX8877EUK39+T uniquely balances ultra-low noise, industry-leading dropout, and integrated reverse-battery protection - making it optimal for space-constrained, battery-critical designs where reliability and efficiency must coexist.
Availability
MAX8877EUK39+T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, hand-held instruments, and electronic planners requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MAX8877EUK39+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 family was designed specifically for battery-powered portable electronics needing ultra-low-noise, low-quiescent-current regulation with robust fault protection - targeting extended runtime and field reliability in handheld and wearable devices.
FAQ
What is the exact output voltage tolerance of the MAX8877EUK39+T across temperature and load?
The MAX8877EUK39+T delivers 3.9V with ±1.4% accuracy over the full -40°C to +85°C operating temperature range and for output currents from 0.1mA to 120mA. At +25°C and 0.1mA load, tolerance tightens to ±1.4% (±54.6mV). This specification is production-tested and guaranteed via SQC correlation across temperature extremes, ensuring predictable rail stability in battery-powered systems.
Does the MAX8877EUK39+T include auto-discharge functionality during shutdown?
No, the MAX8877EUK39+T does not include auto-discharge. That feature is exclusive to the MAX8878 variant. When the MAX8877EUK39+T enters shutdown (SHDN ≤ 0.4V), its supply current drops to 10nA, but the output remains floating and retains its voltage until discharged externally. This behavior is confirmed in the Functional Diagram and Pin Description sections of the official datasheet.
What capacitor values are required for stable operation of the MAX8877EUK39+T?
For stable operation, the MAX8877EUK39+T requires a 1µF ceramic capacitor (ESR < 0.2Ω) on the OUT pin and a 1µF ceramic capacitor on the IN pin. The BP pin requires a 0.01µF ceramic capacitor for optimal noise reduction. For VOUT = 3.9V (≥2.5V), the minimum recommended COUT is 1µF; larger values (e.g., 10µF) improve PSRR and transient response without compromising stability.
How does the MAX8877EUK39+T achieve low dropout with a P-channel MOSFET?
The MAX8877EUK39+T uses an internal P-channel MOSFET with 1.1Ω typical RDS(ON). Dropout voltage equals ILOAD × RDS(ON), resulting in only 165mV at 150mA. Unlike NPN/PNP regulators, it requires no base/gate drive current - enabling constant 100µA quiescent current even in dropout, which directly improves battery runtime in deep-discharge conditions.
Is reverse-battery protection active on both IN and SHDN pins of the MAX8877EUK39+T?
Yes, reverse-battery protection operates on both IN and SHDN pins. If either pin falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to ≤1mA. This dual-pin protection is explicitly documented in the Absolute Maximum Ratings and Applications Information sections, safeguarding the device during incorrect battery installation or accidental polarity reversal in field-deployed equipment.
MAX8877EUK39+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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 3.9V
- 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
MAX8877EUK39+T FAQ
1.How can I place an order for MAX8877EUK39+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8877EUK39+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 MAX8877EUK39+T reliable?
The price and inventory of MAX8877EUK39+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8877EUK39+T is usually 5 days.
3.What payment methods are accepted for MAX8877EUK39+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8877EUK39+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8877EUK39+T?
MAX8877EUK39+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8877EUK39+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 MAX8877EUK39+T?
For technical support, including MAX8877EUK39+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8877EUK39+T requirements.
6.How does Aetrix verify that MAX8877EUK39+T is sourced from the original manufacturer or authorized distributors?
All MAX8877EUK39+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 MAX8877EUK39+T meets industry standards.
7.What is the process for return or replacement of MAX8877EUK39+T?
All MAX8877EUK39+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8877EUK39+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 MAX8877EUK39+T part is unused and in its original packaging.
Return procedure for MAX8877EUK39+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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