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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 3.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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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, 150mA maximum output current, 165mV dropout at full load, 30µVRMS output noise, and 100µA operating supply current. It uses an internal P-channel MOSFET pass device and delivers stable voltage for battery-powered portable electronics requiring tight regulation and minimal quiescent power.
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, shutdown current (10nA), output voltage accuracy (±1.4%), thermal protection (155°C trip), and SOT23-5 package compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8877EUK38+T employs a 1.25V bandgap reference and error amplifier driving a 1.1Ω typical P-channel MOSFET pass transistor - enabling ultra-low quiescent current independent of load or dropout condition. Its BP pin integrates a 200kΩ resistor with external 0.01µF capacitor to form an 80Hz low-pass filter for noise reduction.
It features active reverse-battery protection limiting reverse current to 1mA, thermal shutdown at 155°C with 15°C hysteresis, and current limiting set to 160–390mA. Unlike the MAX8878 variant, it lacks auto-discharge functionality - shutdown places output in high-impedance state without active discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.8V ±1.4% (factory-preset; stable over -40°C to +85°C and 0.1–120mA load) |
| Max Output Current | 150mA (continuous; current limit activates ≥160mA to protect device) |
| Dropout Voltage | 165mV at 150mA (enables operation down to VIN = 3.965V; critical for end-of-battery-life support) |
| Output Noise | 30µVRMS (10Hz–100kHz; reduced further with 0.01µF BP capacitor) |
| Quiescent Current | 100µA (constant across load, input voltage, and dropout - extends battery runtime) |
| Shutdown Current | 10nA (logic-controlled active-low SHDN; enables deep sleep in portable systems) |
| PSRR | 63dB at low frequency (improves immunity to upstream supply ripple; rolls off >10kHz) |
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 dual role as circuit ground and thermal path - requires soldering to large copper area for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply connection | Accepts 2.5V–6.5V; bypass with 1µF ceramic capacitor to GND for stability and line-transient suppression |
| 2 GND | Ground reference and thermal sink | Electrical return path; must connect to large PCB copper area to dissipate heat and maintain <150°C junction temperature |
| 3 SHDN | Active-low enable control | Pull low to enter 10nA shutdown; pull high (≥2.0V) or tie to IN for normal operation; no auto-discharge function |
| 4 BP | Bypass node for reference noise filtering | Connect 0.01µF ceramic capacitor to GND; forms 80Hz RC filter to reduce output voltage noise |
| 5 OUT | Regulated output terminal | Delivers 3.8V up to 150mA; bypass with 1µF (ESR <0.2Ω) ceramic capacitor for VOUT ≥2.5V |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss - maintains 100µA IQ across all load and dropout conditions |
| Reverse battery protection | Clamps reverse current to ≤1mA when IN or SHDN falls below GND - prevents damage in miswired battery installations |
| Thermal shutdown with hysteresis | Shuts down at 155°C; re-enables only after cooling by 15°C - prevents thermal oscillation during sustained overload |
| Pin-compatible with '2982 | Direct drop-in replacement for legacy 5-pin regulators - no PCB redesign required for upgrade paths |
| Low-noise BP filtering | External 0.01µF capacitor on BP reduces output noise to 30µVRMS - suitable for RF, ADC, and precision analog circuits |
Applications
| Cellular Handsets | PCMCIA Cards |
|---|---|
|
Use Scenario: Powering RF transceiver bias rails and baseband processor I/O supplies in GSM/CDMA handsets with single-cell Li-ion battery input. IC Role / Device Role / Timing Role: Low-noise 3.8V LDO delivering clean power to sensitive RF sections while maintaining regulation down to 3.965V input during battery discharge. Use Value: 30µVRMS noise avoids reciprocal mixing in receiver front-end; 100µA quiescent current extends standby time without compromising RF performance. |
Use Scenario: Providing regulated 3.8V supply to PCMCIA card controllers and interface logic in laptop expansion slots. IC Role / Device Role / Timing Role: Primary voltage regulator for hot-pluggable peripheral cards requiring fast transient response and reverse-polarity protection. Use Value: 12mV load-step transient (0→50mA) ensures stable logic levels during card enumeration; reverse battery protection safeguards host system during insertion/removal. |
| 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: Stable 3.8V rail for ADC reference and op-amp biasing, with minimal load-dependent drift. Use Value: ±1.4% output accuracy and <0.04%/mA load regulation ensure measurement repeatability; thermal shutdown prevents field failure during extended use. |
Use Scenario: Powering real-time clock (RTC), memory, and display driver in battery-backed PDAs and scheduling assistants. IC Role / Device Role / Timing Role: Always-on LDO supporting RTC and SRAM retention during main system sleep. Use Value: 10nA shutdown current enables multi-year backup battery life; 165mV dropout allows full utilization of coin-cell voltage range. |
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; otherwise identical specs and pinout | Required where output must be actively pulled to GND during shutdown (e.g., to prevent back-powering downstream logic) | Select MAX8878EUK38+T only if auto-discharge is needed; MAX8877EUK38+T is preferred for zero-output-leakage shutdown |
| MCP1703T-3802E/MB | Higher 250mV dropout at 150mA; 40µVRMS noise; 2µA IQ (no shutdown) | Lacks shutdown control and reverse-battery protection; suited for cost-sensitive non-battery applications | Choose only for fixed-voltage, non-shutdown, non-reverse-protected use cases; not suitable for portable or safety-critical designs |
Compared with MAX8877EUK38+T, the MAX8878EUK38+T adds auto-discharge at identical cost and footprint, while the MCP1703T-3802E/MB trades noise, protection, and controllability for lower quiescent current - making MAX8877EUK38+T optimal for battery-powered systems needing robustness, low noise, and precise shutdown behavior.
Availability
MAX8877EUK38+T is available at Aetrix Electronics and suitable for cellular handsets, PCMCIA cards, hand-held instruments, and electronic planners 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 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 minimal quiescent current - targeting cellular telephones, handheld instruments, and PCMCIA peripherals.
FAQ
What is the exact output voltage tolerance of the MAX8877EUK38+T?
The MAX8877EUK38+T has a factory-trimmed output voltage of 3.8V with ±1.4% accuracy over temperature (-40°C to +85°C) and load (0.1mA to 120mA). This specification is guaranteed across the full operating range and is confirmed in the Electrical Characteristics table of the official datasheet.
Does the MAX8877EUK38+T include thermal shutdown protection?
Yes, the MAX8877EUK38+T includes thermal-overload protection that disables the pass transistor when junction temperature exceeds +155°C. It re-enables automatically after cooling by 15°C, providing pulsed operation under sustained overload - protecting the device without requiring external circuitry.
Can the MAX8877EUK38+T be used with input voltages below 2.5V?
No - the absolute minimum input voltage for the MAX8877EUK38+T is 2.5V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Operation below this threshold is not guaranteed and may result in loss of regulation or undefined behavior.
What capacitor values are recommended for stable operation of the MAX8877EUK38+T?
For stable operation, use a 1µF ceramic capacitor (ESR <0.2Ω) on IN, a 1µF ceramic capacitor on OUT (since VOUT = 3.8V ≥2.5V), and a 0.01µF ceramic capacitor on BP. These values ensure stability across -40°C to +85°C and up to 150mA load per the Capacitor Selection section of the datasheet.
Is the MAX8877EUK38+T pin-compatible with the industry-standard '2982 regulator?
Yes - the MAX8877EUK38+T uses the same 5-pin SOT23-5 pinout as the industry-standard '2982 family. Pin assignments (IN, GND, SHDN, BP, OUT) match exactly, enabling direct replacement without PCB modification or layout changes.
MAX8877EUK38+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):
- 3.8V
- 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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