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Analog Devices Inc./Maxim Integrated MAX8868EUK25+T
- Part No.:
- MAX8868EUK25+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8868EUK25+T.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,063
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Product details
Overview
MAX8868EUK25+T 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 - designed for battery-powered portable electronics requiring stable, clean power under light-to-moderate load conditions.
For engineers reviewing the MAX8868EUK25+T datasheet, MAX8868EUK25+T pinout, MAX8868EUK25+T application, or MAX8868EUK25+T equivalent, key selection criteria include its auto-discharge function, reverse battery protection, thermal shutdown behavior, and SOT23-5 package compatibility with legacy MAX8863/64 designs.
Technical Context
The MAX8868EUK25+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) to achieve ultra-low quiescent current (100µA across all load and dropout conditions) and eliminate base-drive losses common in PNP-based LDOs. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to OUT.
Unlike the MAX8867, the MAX8868EUK25+T integrates an active auto-discharge circuit that pulls the output to GND during shutdown via a dedicated discharge path - enabled only when SHDN is logic-low and independent of external components. It also includes reverse battery protection limiting reverse current to ≤1mA when VIN or SHDN falls below GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.4% over -40°C to +85°C - ensures stable core/peripheral rail without external resistors. |
| Max Output Current | 150mA continuous - supports moderate-power RF modules, LCD bias, or microcontroller peripherals. |
| 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, CBP=0.01µF, COUT=10µF) - suitable for noise-sensitive analog circuits like ADC references or RF VCO supplies. |
| Quiescent Current | 100µA operating / 10nA shutdown - preserves battery capacity during sleep modes in handheld instruments and modems. |
| Shutdown Discharge | Active discharge path to GND (MAX8868-specific) - eliminates residual output voltage after shutdown, preventing unintended wake-up or leakage paths. |
| Thermal Shutdown | Triggers at +155°C with +15°C hysteresis - protects device during sustained overload or poor PCB thermal design. |
Pinout & Package
SOT23-5 regular package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body height, 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/discharge control | Logic-low disables regulator and activates internal discharge FET; connect to IN for always-on operation. |
| 2 - GND | Power ground and thermal sink | Must be connected to PCB ground plane with ≥25mm² copper area to maintain TJ < +150°C at 150mA. |
| 3 - IN | Input supply (2.5V–6.5V) | Requires 1µF ceramic bypass to GND; reverse-battery protected - tolerates VIN < 0V up to -7V. |
| 4 - OUT | Regulated 2.5V output | Sources up to 150mA; requires 1–10µF low-ESR ceramic capacitor; stable with ESR ≤0.2Ω at 150mA. |
| 5 - BP | Noise-reduction bypass node | Connects internally to 200kΩ resistor; 0.01µF ceramic cap reduces output noise by filtering reference noise. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on shutdown | MAX8868-exclusive active pull-down to GND - eliminates need for external bleed resistor in battery-critical systems. |
| Reverse battery protection | Limits reverse current to ≤1mA when VIN or SHDN < 0V - prevents damage and data corruption in field-replaceable battery packs. |
| P-channel MOSFET pass element | 1.1Ω RDS(ON) enables 100µA IQ independent of load or dropout - extends shelf life and runtime in always-on sensors. |
| Low-noise architecture | 30µVRMS noise with 0.01µF BP cap - meets stringent requirements for precision analog front-ends and RF power amplifiers. |
| Thermal and short-circuit protection | Self-limiting operation at +155°C with 15°C hysteresis and indefinite short-circuit tolerance - enables robust deployment in unattended devices. |
Applications
| Cellular Telephones | Hand-Held Instruments |
|---|---|
Use Scenario: Powering baseband processor I/O rails and SIM card interface in GSM/GPRS handsets. IC Role / Device Role / Timing Role: Low-noise 2.5V supply for digital logic and level-shifting circuits with fast transient response. Use Value: Auto-discharge prevents SIM card latch-up during battery swap; 30µVRMS noise avoids bit errors in high-speed serial links. |
Use Scenario: Supplying ADC reference and sensor signal conditioning in portable multimeters and thermal imagers. IC Role / Device Role / Timing Role: Precision 2.5V reference source with minimal PSRR-induced ripple on analog measurement paths. Use Value: 1.4% output accuracy and low thermal drift ensure calibrated measurement stability across -20°C to +60°C ambient. |
| PCMCIA Cards | Palmtop Computers |
Use Scenario: Providing isolated 2.5V VCC for PC Card controller ASICs during hot-insertion events. IC Role / Device Role / Timing Role: Input-tolerant LDO with reverse-battery protection and fast startup (<300µs). Use Value: Withstands accidental reverse-polarity insertion and maintains regulated output during card detect transitions. |
Use Scenario: Delivering main system voltage to ARM7-based application processors and SRAM in sub-200g PDAs. IC Role / Device Role / Timing Role: Primary 2.5V power rail with low quiescent current to maximize standby time between charges. Use Value: 100µA operating IQ and 10nA shutdown current extend battery life to >100 hours in suspend mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8867EUK25+T | No auto-discharge; identical pinout, specs, and package - differs only in SHDN behavior. | Preferred where output hold-up is required post-shutdown (e.g., memory retention). | Select MAX8867EUK25+T if discharge is undesirable; verify SHDN logic timing matches host MCU. |
| MCP1700T-2502E/TT | Higher 170mV dropout at 250mA, 40µVRMS noise, no reverse-battery protection, SOT23-3 package. | Suitable for cost-sensitive, non-battery-reverse scenarios with relaxed noise and thermal requirements. | Choose MCP1700T-2502E/TT only if board space allows SOT23-3 rework and reverse polarity is physically prevented. |
Compared with MAX8867EUK25+T, the MAX8868EUK25+T adds critical auto-discharge for safety-critical battery systems; versus MCP1700T-2502E/TT, it delivers superior noise performance, reverse protection, and thermal robustness - justifying use in premium portable instrumentation and telecom modules.
Availability
MAX8868EUK25+T is available at Aetrix Electronics and suitable for cellular telephones, hand-held instruments, PCMCIA cards, and palmtop computers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8868EUK25+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 MAX8867/MAX8868 family was designed specifically for battery-powered portable electronics needing ultra-low noise, low IQ, and robust fault protection - targeting cellular handsets, modems, and handheld test equipment.
FAQ
What is the output voltage tolerance of the MAX8868EUK25+T over temperature?
The MAX8868EUK25+T guarantees ±1.4% output voltage accuracy over the full -40°C to +85°C operating range. Typical output voltage drift vs. temperature is less than ±0.5mV/°C, as shown in Figure MAX8867/8-07 of the datasheet. This tight tolerance ensures reliable operation of 2.5V-tolerant logic and analog interfaces without external trimming.
Does the MAX8868EUK25+T require an external BP capacitor to function?
Yes, the MAX8868EUK25+T requires a 0.01µF ceramic capacitor connected between BP and GND to achieve its specified 30µVRMS output noise. Omitting this capacitor increases output noise significantly - up to 200µVRMS - due to unfiltered bandgap reference noise. The BP pin must not be left floating or shorted to GND.
How does the auto-discharge feature of the MAX8868EUK25+T operate?
When SHDN is pulled low, the MAX8868EUK25+T activates an internal NMOS discharge switch between OUT and GND, pulling the output voltage to within 100mV of GND in <1ms (depending on COUT). This function is exclusive to the MAX8868 series and is disabled in the MAX8867EUK25+T. No external components are needed.
Can the MAX8868EUK25+T be used with input voltages below 2.5V?
No - the absolute minimum input voltage for the MAX8868EUK25+T is 2.5V, as specified in the Absolute Maximum Ratings table. Operation below 2.5V may cause regulation loss, increased dropout, or undefined behavior. For sub-2.5V inputs, consider alternative regulators such as the MAX1726 or MAX8881 with lower VIN(MIN).
What thermal derating applies to the MAX8868EUK25+T in SOT23-5 package?
The MAX8868EUK25+T in SOT23-5 regular package has a θJB of 140°C/W and a maximum continuous power dissipation of 571mW at +70°C ambient. Above +70°C, power must be derated by 7.1mW/°C. To sustain 150mA at 2.5V output with 4.5V input (PD = 300mW), PCB thermal design must keep junction temperature below +150°C.
MAX8868EUK25+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:
- 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
MAX8868EUK25+T FAQ
1.How can I place an order for MAX8868EUK25+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8868EUK25+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 MAX8868EUK25+T reliable?
The price and inventory of MAX8868EUK25+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EUK25+T is usually 5 days.
3.What payment methods are accepted for MAX8868EUK25+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EUK25+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8868EUK25+T?
MAX8868EUK25+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8868EUK25+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 MAX8868EUK25+T?
For technical support, including MAX8868EUK25+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EUK25+T requirements.
6.How does Aetrix verify that MAX8868EUK25+T is sourced from the original manufacturer or authorized distributors?
All MAX8868EUK25+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 MAX8868EUK25+T meets industry standards.
7.What is the process for return or replacement of MAX8868EUK25+T?
All MAX8868EUK25+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EUK25+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 MAX8868EUK25+T part is unused and in its original packaging.
Return procedure for MAX8868EUK25+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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