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Analog Devices Inc./Maxim Integrated MAX8863REUK
- Part No.:
- MAX8863REUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8863REUK.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:1,511
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Product details
Overview
MAX8863REUK from Maxim Integrated is a low-dropout linear regulator with fixed 2.80V output, delivering up to 120mA from a +2.5V to +6.5V input. It features an internal P-channel MOSFET pass transistor, 55mV dropout at 50mA, 80µA operating supply current independent of load, and reverse battery protection - designed for space-constrained, battery-powered portable electronics including cordless phones and modems.
For engineers reviewing the MAX8863REUK datasheet, MAX8863REUK pinout, MAX8863REUK application, or MAX8863REUK equivalent, key selection criteria include its fixed 2.80V output, SOT23-5 package compatibility, thermal shutdown (170°C), 350µVRMS output noise, and Dual Mode™ capability (though preset mode is active when SET = GND).
Technical Context
The MAX8863REUK uses a 1.25V bandgap reference and error amplifier to regulate output via a P-channel MOSFET pass transistor with ~1.1Ω RDS(ON). Its feedback path is selected by a Dual Mode™ comparator that detects SET pin voltage: below 60mV enables internal resistor divider for fixed 2.80V output (R version). No external resistors are required in this configuration.
Shutdown is active-low on SHDN; during shutdown, supply current drops to 0.1nA and the pass transistor, reference, and bias circuits are fully disabled. Unlike the MAX8864, the MAX8863REUK does not provide auto-discharge - output remains floating when shut down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.80V (±3% over -40°C to +85°C); enables direct replacement of 2.8V logic rails without external components. |
| Dropout Voltage | 55mV @ 50mA load; allows operation down to VIN = 2.855V while maintaining regulation - critical for end-of-life alkaline or Li-ion battery use. |
| Quiescent Current | 80µA across full load range (0–120mA) and dropout; ensures minimal battery drain in standby and active modes. |
| Output Noise | 350µVRMS (10Hz–1MHz); suitable for powering analog circuitry such as ADCs and RF front-ends without additional filtering. |
| Thermal Shutdown | Triggers at +170°C with 20°C hysteresis; protects against sustained overload or poor PCB thermal design without requiring external thermal management. |
| Reverse Battery Protection | Limits reverse current to <1mA if VIN or SHDN falls below GND; prevents battery damage and IC overheating in miswired portable systems. |
| Max Output Current | 120mA continuous; supports moderate-power peripherals like LCD backlights or baseband processors in handheld instruments. |
Pinout & Package
Package: SOT23-5 (5-pin, surface-mount, RoHS-compliant), 2.9mm × 1.6mm footprint with exposed pad for thermal conduction. GND pin serves dual role as electrical ground and primary heatsink - requires connection to large copper area for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control | Logic low disables regulator and reduces IQ to 0.1nA; connect to IN for always-on operation; no auto-discharge function (MAX8864 only). |
| 2 - GND | Ground reference and thermal path | Must be soldered to ≥100mm² copper pour to maintain junction temperature within limits under 120mA load. |
| 3 - IN | Input power supply | Accepts +2.5V to +6.5V; requires ≥1µF ceramic bypass capacitor to GND near pin for stability and transient immunity. |
| 4 - OUT | Regulated output | Delivers fixed 2.80V up to 120mA; requires ≥1µF ceramic output capacitor with ESR <0.2Ω for stable operation across temperature and load. |
| 5 - SET | Feedback mode selector | Tied to GND to activate internal 2.80V divider; floating or >60mV forces adjustable mode - not used in MAX8863REUK default configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Operation | Hardware-selectable fixed (2.80V) or adjustable (1.25V–6.5V) output via SET pin voltage - eliminates need for separate part numbers for different VOUT requirements. |
| P-Channel MOSFET Pass Element | ~1.1Ω RDS(ON) enables ultra-low quiescent current (80µA) independent of load or dropout condition - extends battery life in intermittent-use devices. |
| Reverse Battery Protection | Integrated circuitry blocks reverse current <1mA when VIN or SHDN is negative relative to GND - removes need for external series diode and associated voltage drop. |
| Thermal Overload Protection | Self-resetting shutdown at +170°C with 20°C hysteresis - maintains safe operation during momentary overloads without manual reset or system intervention. |
| Low-Noise Regulation | 350µVRMS integrated noise (10Hz–1MHz) meets requirements for powering precision analog sensors and 12-bit+ ADCs without post-regulation filtering. |
Applications
| Cordless Telephones | Modems |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver in DECT 6.0 cordless handsets with single-cell Li-ion or NiMH battery. IC Role / Device Role / Timing Role: Primary 2.80V LDO supplying core logic and memory interface; replaces less efficient switching solutions where low noise and small size are mandatory. Use Value: 55mV dropout extends usable battery voltage down to 2.855V, increasing talk time by ~12% versus higher-dropout alternatives; 80µA IQ minimizes standby drain. |
Use Scenario: Regulating 2.8V supply for DSL line driver ICs and analog front-end in residential broadband modems. IC Role / Device Role / Timing Role: Low-noise local regulator for sensitive analog signal chain; decouples noisy digital sections from precision line drivers. Use Value: 350µVRMS noise avoids SNR degradation in ADSL2+ receivers; SOT23-5 footprint fits tight layout constraints near RJ-11 interface. |
| Hand-Held Instruments | Electronic Planners |
Use Scenario: Providing stable 2.80V rail for microcontroller, LCD controller, and sensor interface in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Main system regulator with reverse battery protection - critical for field-replaceable battery compartments prone to insertion errors. Use Value: Reverse battery protection prevents >1mA fault current and thermal runaway; 120mA output supports backlight LED drive without secondary regulators. |
Use Scenario: Powering real-time clock (RTC), SRAM, and touch controller in battery-backed PDAs and electronic organizers. IC Role / Device Role / Timing Role: Always-on LDO maintaining 2.80V for RTC/SRAM retention during main system sleep; leverages 80µA IQ for multi-week backup. Use Value: 80µA supply current remains constant even in dropout - ensures reliable RTC operation as battery discharges from 3.0V to 2.855V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout, fixed-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76328DBVR | Fixed 2.8V output, 150mA rating, 125µA IQ, 170mV dropout @ 150mA; SOT23-5 package. | Higher dropout and IQ reduce battery life in low-voltage, low-power portable designs. | Select when higher output current margin is needed and 170mV dropout is acceptable (e.g., systems with >3.0V minimum VIN). |
| MCP1700T-2802E/TT | Fixed 2.8V output, 250mA rating, 1.6µA IQ, 600mV dropout @ 250mA; SOT23-3 package (no SHDN). | No shutdown pin or reverse battery protection; higher dropout limits usable battery range. | Select for ultra-low-IQ applications where shutdown and reverse protection are unnecessary and board space permits larger dropout margin. |
Compared with TPS76328DBVR and MCP1700T-2802E/TT, the MAX8863REUK delivers superior battery efficiency via 55mV dropout and 80µA load-independent IQ, while integrating reverse battery protection and active shutdown - making it optimal for compact, safety-critical portable equipment.
Availability
MAX8863REUK is available at Aetrix Electronics and suitable for cordless telephones, modems, and hand-held instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8863REUK 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 MAX8863 family was designed specifically for battery-powered portable electronics demanding ultra-low quiescent current, low dropout, and integrated protection - targeting cellular handsets, modems, and handheld instrumentation.
FAQ
What is the output voltage tolerance of the MAX8863REUK over temperature and load?
The MAX8863REUK delivers a nominal 2.80V output with ±3% tolerance across the full operating range of -40°C to +85°C and 0mA to 120mA load. This specification is production-tested at +25°C and guaranteed over temperature via Statistical Quality Control correlation - ensuring consistent performance in battery-powered handheld devices where voltage stability directly impacts system reliability.
Does the MAX8863REUK include auto-discharge functionality during shutdown?
No, the MAX8863REUK does not include auto-discharge. That feature is exclusive to the MAX8864 series. When SHDN is pulled low on the MAX8863REUK, the output floats; the pass transistor and internal circuitry are disabled, reducing supply current to 0.1nA, but no active discharge path to GND is provided. Designers requiring output discharge must select MAX8864REUK or add external circuitry.
What is the minimum input voltage required for regulation with the MAX8863REUK?
The minimum input voltage for regulation is VOUT + dropout voltage. For the MAX8863REUK at 50mA load, dropout is 55mV, so minimum VIN = 2.80V + 0.055V = 2.855V. At 120mA, dropout rises proportionally with RDS(ON); typical maximum dropout is 120mV, setting absolute minimum VIN at 2.92V. Below these thresholds, output voltage drops linearly with input.
Can the MAX8863REUK be used with input voltages above 5.5V?
Yes, but a minimum load current of 20µA is required to maintain regulation when VIN > 5.5V in preset (fixed) mode. This ensures stable operation of the internal reference and error amplifier. The requirement is specified in the Applications Information section of the MAX8863REUK datasheet and applies regardless of output load - designers must verify sufficient minimum load exists in all operating conditions.
What capacitor values are recommended for stable operation of the MAX8863REUK?
Maxim specifies 1µF X7R ceramic capacitors for both input (CIN) and output (COUT), placed as close as possible to the respective pins. COUT must have ESR <0.2Ω for stability across temperature and load. Larger values (e.g., 10µF input) improve transient response for fast load steps, but 1µF remains the minimum validated value for full-range stability per the MAX8863REUK datasheet.
MAX8863REUK 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:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 1.25V (2.8V)
- Voltage - Output (Max):
- 6.5V
- Voltage Dropout (Max):
- 0.12V @ 50mA
- Current - Output:
- 120mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- -
- PSRR:
- 62dB (300Hz)
- 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
MAX8863REUK FAQ
1.How can I place an order for MAX8863REUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8863REUK 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 MAX8863REUK reliable?
The price and inventory of MAX8863REUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8863REUK is usually 5 days.
3.What payment methods are accepted for MAX8863REUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8863REUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8863REUK?
MAX8863REUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8863REUK 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 MAX8863REUK?
For technical support, including MAX8863REUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8863REUK requirements.
6.How does Aetrix verify that MAX8863REUK is sourced from the original manufacturer or authorized distributors?
All MAX8863REUK 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 MAX8863REUK meets industry standards.
7.What is the process for return or replacement of MAX8863REUK?
All MAX8863REUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX8863REUK, 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 MAX8863REUK part is unused and in its original packaging.
Return procedure for MAX8863REUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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