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Analog Devices Inc./Maxim Integrated MAX8867EUK25
- Part No.:
- MAX8867EUK25
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8867EUK25.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:6,663
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Product details
Overview
MAX8867EUK25 from Maxim Integrated is a low-noise, low-dropout linear regulator with 2.5V fixed output, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load. It uses an internal P-channel MOSFET pass transistor and operates from 2.5V to 6.5V input, targeting battery-powered handheld instruments and PCMCIA cards requiring stable, quiet voltage regulation.
For engineers reviewing the MAX8867EUK25 datasheet, MAX8867EUK25 pinout, MAX8867EUK25 application, or MAX8867EUK25 equivalent, key selection criteria include output noise performance, shutdown current (10nA), thermal protection behavior, BP capacitor dependency for noise reduction, and SOT23-5 package compatibility with legacy MAX8863/64 designs.
Technical Context
The MAX8867EUK25 implements a bandgap-referenced error amplifier driving a P-channel MOSFET pass element, enabling ultra-low quiescent current (100µA) independent of load or dropout condition. Its BP pin connects to an internal 200kΩ resistor forming an 80Hz low-pass filter with an external 0.01µF capacitor, directly reducing output voltage noise.
Thermal shutdown activates at +155°C with +15°C hysteresis, and reverse battery protection limits reverse current to 1mA when IN or SHDN falls below GND. The device lacks auto-discharge - that feature is exclusive to MAX8868 variants - and its output voltage is factory-trimmed to 2.5V ±1.4% over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.4% over -40°C to +85°C - ensures stable logic supply for 2.5V I/O systems without external feedback. |
| Max Output Current | 150mA continuous - sufficient for powering baseband processors or RF front-end ICs in portable devices. |
| Dropout Voltage | 165mV at 150mA - enables operation down to 2.665V input, extending usable battery life in single-cell Li-ion or alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) with 0.01µF BP cap - meets stringent noise requirements for ADC reference supplies or RF synthesizer VCOs. |
| Quiescent Current | 100µA operating / 10nA shutdown - minimizes standby power loss in always-on subsystems like real-time clocks or wake-up controllers. |
| Input Voltage Range | 2.5V to 6.5V - supports direct connection to single-cell Li-ion (2.7–4.2V), two-cell alkaline (3.0–3.6V), or regulated 5V rails. |
| Protection Features | Thermal shutdown (+155°C), short-circuit limit (min 160mA), reverse battery protection (1mA max reverse current) - enables robust deployment in unattended portable equipment. |
Pinout & Package
SOT23-5 regular package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, GND pin serves as thermal pad - requires soldering to large copper area for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable control | Logic low disables regulator and reduces supply current to 10nA; must be tied to IN for always-on operation. |
| 2 - GND | Power ground and thermal path | Electrical return and primary heat dissipation path - requires PCB copper pour for >571mW power handling. |
| 3 - IN | Input voltage supply | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass capacitor close to pin to suppress input ripple and transients. |
| 4 - OUT | Regulated output | Delivers up to 150mA at 2.5V; requires ≥1µF low-ESR output capacitor for stability and transient response. |
| 5 - BP | Noise-reduction bypass node | Connects to internal 200kΩ resistor; 0.01µF ceramic capacitor here reduces output noise by filtering reference noise. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current, enabling constant 100µA IQ across all load and dropout conditions - extends battery runtime vs. PNP-based LDOs. |
| BP pin noise filtering | External 0.01µF capacitor forms 80Hz RC filter with internal 200kΩ resistor, achieving 30µVRMS output noise - critical for precision analog signal chains. |
| Reverse battery protection | Active circuitry limits reverse current to ≤1mA when IN or SHDN goes <0V - prevents damage during incorrect battery insertion in consumer handhelds. |
| Thermal shutdown with hysteresis | Triggers at +155°C and re-enables only after cooling by +15°C - prevents thermal oscillation during sustained overload in enclosed enclosures. |
| Preset 2.5V output accuracy | ±1.4% over full temperature range (-40°C to +85°C) - eliminates need for external resistive divider and associated layout sensitivity. |
Applications
| Hand-Held Instruments | PCMCIA Cards |
|---|---|
Use Scenario: Portable multimeters and data loggers powered by two AA batteries (3.0V–3.6V) requiring clean 2.5V supply for 16-bit ADC reference. IC Role / Device Role / Timing Role: Low-noise voltage regulator providing stable 2.5V reference rail isolated from battery impedance and switching noise. Use Value: 30µVRMS noise ensures <1 LSB error in 16-bit conversions; 165mV dropout allows operation until battery drops to 2.665V. | Use Scenario: PCMCIA modem card drawing burst current up to 120mA while maintaining 2.5V core logic voltage from host 3.3V supply. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling host rail and delivering low-impedance 2.5V for UART and DSP cores. Use Value: 100µA quiescent current minimizes standby drain; thermal shutdown protects against connector hot-plug faults. |
| Palmtop Computers | Modems |
Use Scenario: Palmtop PDA with ARM7 processor requiring tightly regulated 2.5V I/O voltage from variable 3.0V–4.2V Li-ion battery. IC Role / Device Role / Timing Role: Primary I/O voltage regulator ensuring GPIO and memory interface compliance across battery discharge curve. Use Value: ±1.4% output accuracy maintains timing margin for synchronous peripherals; SOT23-5 footprint saves board space. | Use Scenario: External USB modem housing GSM baseband IC needing 2.5V supply with fast load-transient response to RF transmit bursts. IC Role / Device Role / Timing Role: High-stability LDO supplying clean power to RF synthesizer and analog front-end during TX/RX switching. Use Value: 12mV load transient (0–50mA step) meets GSM spectral mask requirements; BP capacitor optimizes phase noise floor. |
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 |
|---|---|---|---|
| MAX8863EUK25 | Same pinout and 2.5V output, but higher 50µVRMS noise and no BP pin - lacks integrated noise filtering path. | Acceptable where noise <50µVRMS suffices; unsuitable for ADC reference or VCO supply. | Select MAX8863EUK25 only if cost sensitivity outweighs noise requirement and BP capacitor routing is undesirable. |
| MCP1700T-2502E/MB | 2.5V fixed output, 250mA rating, 30µVRMS noise, but uses NPN pass transistor - higher 2.5µA quiescent current in dropout. | Better for higher-current loads; less suitable for ultra-low-power battery hold-up due to higher IQ in dropout. | Choose MCP1700T-2502E/MB when >150mA is needed and 2.5µA dropout IQ is acceptable - not drop-in due to different pinout (SOT23-3). |
Compared with MAX8863EUK25, the MAX8867EUK25 delivers 40% lower output noise via BP filtering and maintains 100µA IQ in dropout; versus MCP1700T-2502E/MB, it offers superior quiescent current efficiency and pin compatibility with legacy Maxim designs, though at lower max current.
Availability
MAX8867EUK25 is available at Aetrix Electronics and suitable for handheld instrumentation, PCMCIA peripheral design, and palmtop computing applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance over industrial temperature range.
Supply support for MAX8867EUK25 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 precision analog, mixed-signal, and power management ICs for industrial, medical, automotive, and communications systems.
The MAX8867/MAX8868 product line targets battery-powered portable electronics requiring ultra-low noise, low IQ, and robust protection - optimized for space-constrained handhelds where reliability and efficiency are critical.
FAQ
What is the maximum input voltage rating for the MAX8867EUK25?
The MAX8867EUK25 has an absolute maximum input voltage of +7V on the IN pin, but its recommended operating range is 2.5V to 6.5V. Exceeding 6.5V may degrade long-term reliability or trigger overvoltage stress not covered by production testing. Always maintain VIN within 2.5V–6.5V for guaranteed performance per the datasheet specifications of the MAX8867EUK25.
Does the MAX8867EUK25 include auto-discharge functionality during shutdown?
No, the MAX8867EUK25 does not provide auto-discharge. That feature is exclusive to the MAX8868 family (e.g., MAX8868EUK25). When the MAX8867EUK25 enters shutdown mode, the output remains floating at its last regulated voltage; external circuitry is required to actively discharge the output capacitor if needed.
What capacitor value is required on the BP pin of the MAX8867EUK25 for optimal noise performance?
A 0.01µF ceramic capacitor is required on the BP pin of the MAX8867EUK25 to achieve the specified 30µVRMS output noise. Larger values (e.g., 0.1µF) marginally reduce noise but increase startup time and shutdown exit delay; values above 0.1µF provide no measurable benefit and are not recommended per the MAX8867EUK25 datasheet.
Can the MAX8867EUK25 replace the MAX8863EUK25 in an existing design without modifications?
Yes, the MAX8867EUK25 is pin-compatible with the MAX8863EUK25 except for the BP pin, which is unused on the MAX8863EUK25. Leaving the BP pin unconnected maintains full functionality, though noise performance will match the MAX8863EUK25 (50µVRMS). To leverage the MAX8867EUK25's lower noise, add a 0.01µF capacitor from BP to GND.
What is the thermal shutdown threshold and hysteresis for the MAX8867EUK25?
Thermal shutdown activates at +155°C junction temperature with +15°C hysteresis, meaning the MAX8867EUK25 resumes regulation only after cooling to +140°C. This behavior is confirmed across the -40°C to +85°C ambient range and is integral to the MAX8867EUK25's protection architecture - no external components are needed to implement this safeguard.
MAX8867EUK25 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):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 63dB (10kHz)
- 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
MAX8867EUK25 FAQ
1.How can I place an order for MAX8867EUK25 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8867EUK25 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 MAX8867EUK25 reliable?
The price and inventory of MAX8867EUK25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8867EUK25 is usually 5 days.
3.What payment methods are accepted for MAX8867EUK25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8867EUK25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8867EUK25?
MAX8867EUK25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8867EUK25 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 MAX8867EUK25?
For technical support, including MAX8867EUK25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8867EUK25 requirements.
6.How does Aetrix verify that MAX8867EUK25 is sourced from the original manufacturer or authorized distributors?
All MAX8867EUK25 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 MAX8867EUK25 meets industry standards.
7.What is the process for return or replacement of MAX8867EUK25?
All MAX8867EUK25 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8867EUK25, 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 MAX8867EUK25 part is unused and in its original packaging.
Return procedure for MAX8867EUK25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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