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Analog Devices Inc./Maxim Integrated MAX8863SEUK
- Part No.:
- MAX8863SEUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8863SEUK.pdf
- Description:
- LOW-DROPOUT, 120MA, LINEAR REGUL
- Quantity:
- Payment:
- Shipping:
Inventory:2,700
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Product details
Overview
MAX8863SEUK from Maxim Integrated is a low-dropout linear regulator with fixed 2.84V output, delivering up to 120mA from a +2.5V to +6.5V input. It features 55mV dropout at 50mA, 68µA no-load supply current, 350µVRMS output noise, and Dual Mode™ operation (fixed or adjustable). Designed for battery-powered portable electronics including cordless phones and modems.
For engineers reviewing the MAX8863SEUK datasheet, MAX8863SEUK pinout, MAX8863SEUK application, or MAX8863SEUK equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts for fixed-output LDO selection.
Technical Context
The MAX8863SEUK uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current (80µA across load and dropout conditions) and eliminating base-drive losses inherent in PNP-based regulators. Its error amplifier compares a 1.25V bandgap reference against feedback from either internal resistors (for fixed 2.84V output) or an external SET-pin divider.
Dual Mode™ logic selects regulation path based on SET pin voltage: below 60mV enables internal feedback and fixed output; above 60mV activates external resistor network for 1.25V–6.5V adjustability. Shutdown reduces supply current to 0.1nA, and thermal protection triggers at +170°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.84V (±3% over -40°C to +85°C); ensures stable core voltage for 2.8V logic rails without external resistors. |
| Dropout Voltage | 55mV @ 50mA load; allows operation down to VIN = 2.895V, extending usable battery life in single-cell Li-ion or NiMH systems. |
| Quiescent Current | 68µA no-load / 80µA operating (load-independent); minimizes standby power loss in always-on portable devices. |
| Output Noise | 350µVRMS (10Hz–1MHz); compatible with 12-bit ADCs when combined with proper bypassing and layout. |
| Max Output Current | 120mA continuous; sufficient for RF front-ends, microcontroller peripherals, and sensor signal chains in compact hand-held instruments. |
| Input Voltage Range | +2.5V to +6.5V; supports single-cell Li-ion (2.7–4.2V), dual-cell alkaline (2.4–3.2V), and regulated 3.3V/5V supplies. |
| Shutdown Current | 0.1nA typical; enables multi-year shelf life in battery-backed memory or real-time clock circuits. |
Pinout & Package
MAX8863SEUK is housed in a RoHS-compliant 5-pin SOT23-5 package (top mark AABF), with GND serving as both electrical return and thermal dissipation path. Recommended PCB layout uses a large copper pour connected to Pin 2 (GND) for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control | Pulling low disables regulator and reduces IQ to 0.1nA; on MAX8864 only, it also discharges VOUT-MAX8863SEUK does not provide auto-discharge. |
| 2 - GND | Power ground and thermal pad | Primary current return path and main heat sink; must be soldered to ≥100mm² copper area for safe 120mA operation at +85°C ambient. |
| 3 - IN | Regulator input supply | Accepts +2.5V to +6.5V; requires ≥1µF ceramic capacitor to GND within 5mm for stability and transient immunity. |
| 4 - OUT | Regulated output | Delivers fixed 2.84V up to 120mA; requires ≥1µF ceramic capacitor (ESR < 0.2Ω) directly at pin for loop stability and noise suppression. |
| 5 - SET | Feedback mode selector | Connected to GND to enable fixed 2.84V output; floating or >60mV enables adjustable mode-must be ≤100kΩ to GND in fixed mode to avoid spurious switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ operation | Single-pin (SET) selection between factory-trimmed 2.84V output and 1.25V–6.5V adjustable range-eliminates BOM variants for mixed-voltage designs. |
| Reverse battery protection | Limits reverse current to <1mA if VIN or SHDN falls below GND-prevents battery drain and IC damage in miswired portable assemblies. |
| Thermal shutdown with hysteresis | Shuts down at +170°C junction temperature and re-enables after cooling by 20°C-enables safe intermittent overload handling without latch-up. |
| Low-noise P-channel architecture | 350µVRMS noise and 62dB PSRR at DC–300Hz-reduces need for post-regulation filtering in analog-sensor and RF bias applications. |
| Current limit protection | ~280mA foldback limit (120mA min / 420mA max); sustains indefinite short-circuit without damage while limiting power dissipation during fault conditions. |
Applications
| Cordless Telephones | Modems |
|---|---|
|
Use Scenario: Powering RF transceiver ICs and audio codec circuitry in DECT 6.0 handsets with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary 2.84V LDO supplying clean, low-noise voltage to sensitive RF sections and PLLs. Use Value: 55mV dropout extends talk time by 12–15 minutes per charge cycle compared to standard 200mV-dropout regulators. |
Use Scenario: Regulating 2.84V for UART interface, line-driver ICs, and flash memory in DSL/cable modems. IC Role / Device Role / Timing Role: Fixed-output LDO providing stable I/O rail for serial communication peripherals and nonvolatile storage. Use Value: 68µA quiescent current reduces standby power by >40% versus legacy bipolar LDOs, meeting Energy Star sleep-mode requirements. |
| Hand-Held Instruments | PCMCIA Cards |
|
Use Scenario: Supplying precision analog front-end (AFE) and microcontroller core in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise 2.84V source for ADC reference buffers and op-amp signal conditioning stages. Use Value: 350µVRMS noise ensures <1 LSB error in 12-bit ADC conversions without additional RC filtering. |
Use Scenario: Generating 2.84V for card controller logic and SRAM in PCMCIA Type II peripheral cards (e.g., wireless LAN adapters). IC Role / Device Role / Timing Role: Compact, thermally robust LDO fitting tight board space constraints while supporting hot-plug insertion. Use Value: SOT23-5 footprint and GND-as-thermal-pad design allow full 120mA delivery in 12mm × 12mm card area without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76328DBVR | Fixed 2.8V output, 150mA rating, 120µA IQ, 250mV dropout @ 150mA; SOT23-5 package. | Higher dropout and quiescent current; suitable where 2.8V (vs. 2.84V) is acceptable and load exceeds 120mA. | Select TPS76328DBVR only if system tolerates 40mV lower output and higher standby power; verify thermal margin at 120mA in same PCB layout. |
| MCP1700T-2802E/TT | Fixed 2.8V output, 250mA rating, 1.6µA IQ, 600mV dropout @ 250mA; SOT23-3 package (no SET/SHDN pins). | No shutdown or mode-select capability; ultra-low IQ ideal for energy-harvesting or coin-cell applications, but lacks flexibility. | Choose MCP1700T-2802E/TT only for always-on, ultra-low-power systems needing 2.8V and no control signals; incompatible pinout prevents drop-in replacement. |
Compared with MAX8863SEUK, TPS76328DBVR trades lower cost for higher dropout and quiescent current, while MCP1700T-2802E/TT sacrifices control features and output accuracy for nanoamp-level standby-neither matches the 2.84V precision, 55mV dropout, and 68µA IQ combination of MAX8863SEUK in space-constrained portable designs.
Availability
MAX8863SEUK is available at Aetrix Electronics and suitable for cordless telephones, modems, and hand-held instruments requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX8863SEUK 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 high-performance analog and mixed-signal ICs for power, sensing, and connectivity applications, with emphasis on efficiency, integration, and reliability.
The MAX8863SEUK belongs to Maxim's low-quiescent-current LDO family, engineered specifically for battery longevity and noise-sensitive operation in portable communications and instrumentation equipment.
FAQ
What is the exact output voltage tolerance of the MAX8863SEUK over temperature?
The MAX8863SEUK delivers a nominal 2.84V output with ±3% tolerance over the full -40°C to +85°C operating range, as specified in the Electrical Characteristics table. This tolerance includes initial accuracy, line regulation, load regulation, and temperature drift-verified across production lots using Statistical Quality Control methods. The MAX8863SEUK maintains this specification without external trimming or calibration.
Does the MAX8863SEUK include auto-discharge functionality during shutdown?
No, the MAX8863SEUK does not include auto-discharge. That feature is exclusive to the MAX8864 series (e.g., MAX8864SEUK). When the SHDN pin is pulled low on the MAX8863SEUK, the output remains floating at its last regulated voltage; external circuitry is required to discharge the output capacitor if needed.
Can the MAX8863SEUK be used with input voltages above 5.5V?
Yes, but a minimum load current of 20µA is required to maintain regulation when VIN exceeds 5.5V in fixed-output mode. This ensures stable feedback loop operation and prevents output voltage drift. The requirement is documented in the Applications Information section and applies specifically to the MAX8863SEUK and other MAX8863 variants.
What is the maximum allowable ESR for the output capacitor on the MAX8863SEUK?
The MAX8863SEUK requires an output capacitor with ESR less than 0.2Ω (typical) for guaranteed stability across all load and temperature conditions. The device is optimized for 1µF ceramic capacitors; higher-ESR tantalum or aluminum electrolytics may cause oscillation or poor transient response and are not recommended.
How does reverse battery protection work on the MAX8863SEUK?
The MAX8863SEUK monitors polarity on both IN and SHDN pins; if either falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to under 1mA. This protects both the IC and the battery from damage due to incorrect installation-confirmed in Absolute Maximum Ratings and Detailed Description sections of the official datasheet.
MAX8863SEUK 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 (2.84V)
- Voltage - Output (Max):
- 6.5V
- Voltage Dropout (Max):
- 0.12V @ 50mA
- Current - Output:
- 120mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 80 µA
- 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
MAX8863SEUK FAQ
1.How can I place an order for MAX8863SEUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8863SEUK 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 MAX8863SEUK reliable?
The price and inventory of MAX8863SEUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8863SEUK is usually 5 days.
3.What payment methods are accepted for MAX8863SEUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8863SEUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8863SEUK?
MAX8863SEUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8863SEUK 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 MAX8863SEUK?
For technical support, including MAX8863SEUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8863SEUK requirements.
6.How does Aetrix verify that MAX8863SEUK is sourced from the original manufacturer or authorized distributors?
All MAX8863SEUK 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 MAX8863SEUK meets industry standards.
7.What is the process for return or replacement of MAX8863SEUK?
All MAX8863SEUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX8863SEUK, 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 MAX8863SEUK part is unused and in its original packaging.
Return procedure for MAX8863SEUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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