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Monolithic Power Systems Inc. MP8903DJ-2.5-LF-Z
- Part No.:
- MP8903DJ-2.5-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP8903DJ-2.5-LF-Z.pdf
- Description:
- IC REG LIN POS ADJ 150MA TSOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,478
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Product details
Overview
MP8903DJ-2.5-LF-Z from Monolithic Power Systems is a 150mA low-dropout linear regulator in TSOT23-5 package, delivering fixed 2.5V output with ±2% accuracy across –40°C to +85°C. It operates from 2.7V to 6.5V input, achieves 100mV dropout at 100mA, and integrates thermal shutdown protection. Used for powering mobile handset PLLs and audio codecs where compact size and stable low-noise bias are critical.
For engineers reviewing the MP8903DJ-2.5-LF-Z datasheet, MP8903DJ-2.5-LF-Z pinout, MP8903DJ-2.5-LF-Z application, or MP8903DJ-2.5-LF-Z equivalent, key selection criteria include dropout voltage at 150mA load, FB threshold tolerance (1.222V ±0.027V), thermal shutdown trigger (155°C), EN logic compatibility (1.5V high / 0.4V low), and stability with 1µF–10µF X5R/X7R output capacitors.
Technical Context
The MP8903DJ-2.5-LF-Z employs a PMOS pass transistor architecture enabling low dropout and inherent reverse-current blocking. Its internal bandgap reference (1.222V) feeds a precision error amplifier that regulates output via feedback from the FB pin, supporting both fixed-output and adjustable configurations.
Thermal protection uses a dedicated junction-sensing circuit with 30°C hysteresis, ensuring safe shutdown before reaching 150°C absolute maximum junction temperature. The EN pin provides active-high enable control with sub-1μA shutdown current, allowing precise power sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% over full temperature and load range - ensures stable bias for sensitive analog blocks like VCOs. |
| Dropout Voltage | 100mV at 100mA load - enables operation down to 2.6V input while maintaining regulation. |
| Input Voltage Range | 2.7V to 6.5V - compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and 3.3V/5V system rails. |
| FB Reference Voltage | 1.222V ±0.027V - sets minimum adjustable output to 1.25V and defines R1/R2 divider ratio accuracy. |
| PSRR | 50dB at 1kHz, 20dB at 1MHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | Triggers at 155°C with 30°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Shutdown Current | 0.1–1μA at VEN = 0V - minimizes battery drain in always-on subsystems during sleep mode. |
Pinout & Package
MP8903DJ-2.5-LF-Z is housed in a RoHS-compliant TSOT23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable designs. Exposed pad is not electrically connected; thermal performance relies on PCB copper area under pin 2 (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Power Input | Supplies pass transistor and internal circuitry; requires ≥1μF X5R/X7R ceramic bypass to GND within 2mm. |
| 2 - GND | Ground Reference | Primary return path for load current and internal bias; must connect directly to low-impedance ground plane. |
| 3 - EN | Enable Control | Active-high logic input; tie to IN for automatic startup or drive externally for sequenced power control. |
| 4 - FB | Feedback Input | Senses output via resistor divider; internal 1.222V reference determines regulation point for adjustable configurations. |
| 5 - OUT | Regulated Output | Delivers 2.5V to load; requires ≥1μF X5R/X7R ceramic capacitor to GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Architecture | PMOS pass element enables 100mV dropout at 100mA - extends battery runtime in low-VIN conditions. |
| Precision Feedback Reference | 1.222V ±0.027V bandgap reference - supports accurate 1.25V–5V adjustable outputs with minimal external component drift. |
| Thermal Protection with Hysteresis | 155°C trip with 30°C recovery gap - avoids oscillation during thermal stress and ensures reliable fault recovery. |
| Stability with Low-ESR Capacitors | Compatible with 1µF–10µF X5R/X7R ceramics - eliminates need for costly tantalum or aluminum electrolytics. |
| Ultra-Low Shutdown Current | ≤1μA shutdown leakage - preserves battery charge in standby for >1 year in typical IoT sensor nodes. |
Applications
| Mobile Handset PLL Power | Audio Codec Bias Supply |
|---|---|
Use Scenario: Providing clean, low-noise 2.5V bias to phase-locked loop circuits in LTE/WCDMA transceivers. IC Role / Device Role / Timing Role: LDO delivers ripple-free VCO tuning voltage independent of noisy system rails. Use Value: PSRR of 50dB at 1kHz suppresses switching noise from PMIC DC/DC converters, reducing PLL phase jitter by up to 30%. | Use Scenario: Supplying reference voltage to stereo audio codecs in smartphones and wearables. IC Role / Device Role / Timing Role: Regulator powers DAC/ADC analog sections requiring <10mV output ripple for 95dB SNR performance. Use Value: 2% output accuracy and low thermal drift ensure consistent full-scale conversion across –40°C to +85°C ambient. |
| 802.11 PC Card Core Logic | IoT Sensor Node MCU Core Rail |
Use Scenario: Delivering 2.5V to WLAN baseband processors in mini-PCIe Wi-Fi modules. IC Role / Device Role / Timing Role: LDO supplies core logic voltage with fast load transient response (<10µs settling) to handle burst-mode processing. Use Value: 100mV dropout allows operation from partially discharged 3.0V Li-ion cells, extending usable battery life by 12%. | Use Scenario: Powering ARM Cortex-M0+ microcontrollers in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Provides always-on core rail with EN-controlled shutdown during deep-sleep cycles. Use Value: Sub-1μA shutdown current enables 10-year battery life in applications drawing 10µA average system current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2502E/MB | 100mA rating, 600mV max dropout at 250mA, no EN pin, SOT23-3 package | Lacks enable control and thermal shutdown; limited to ultra-low-power, non-sequenced rails | Select only when EN and thermal protection are unnecessary and load current stays ≤100mA. |
| Torex XC6206P252MR-G | 150mA rating, 160mV dropout at 100mA, no EN pin, SOT23-5 package, ±2% accuracy | Missing enable function and thermal hysteresis; lower PSRR (40dB @1kHz) | Choose if board space permits larger dropout margin and sequencing is handled externally. |
Compared with MCP1700T-2502E/MB and XC6206P252MR-G, MP8903DJ-2.5-LF-Z uniquely combines 150mA capability, EN control, thermal hysteresis, and 50dB PSRR - making it optimal for sequenced, noise-sensitive, thermally constrained portable designs.
Availability
MP8903DJ-2.5-LF-Z is available at Aetrix Electronics and suitable for mobile handset PLL power, audio codec bias supply, and 802.11 PC card core logic requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MP8903DJ-2.5-LF-Z 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
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, motor drive, and interface applications.
The MP8903 product line targets space-constrained, battery-powered devices requiring ultra-small footprint, low quiescent current, and robust thermal behavior - especially in wireless communications and portable audio subsystems.
FAQ
What is the maximum continuous output current for MP8903DJ-2.5-LF-Z?
The MP8903DJ-2.5-LF-Z is rated for 150mA maximum continuous output current under specified thermal conditions. At 150mA load with 2.7V input and 2.5V output, power dissipation reaches ~30mW; derating is required above +60°C ambient due to θJA = 220°C/W. Full 150mA operation is guaranteed only when PCB layout provides adequate copper area for heat spreading.
Can MP8903DJ-2.5-LF-Z be used in adjustable-output configuration?
Yes - although configured as fixed 2.5V, MP8903DJ-2.5-LF-Z supports adjustable output from 1.25V to 5V using an external resistor divider on the FB pin. The internal 1.222V reference remains active; R1 and R2 must sum to ≤100kΩ, and R2 should be 10kΩ ±1% for best accuracy. No internal resistor is disconnected in this mode.
Does MP8903DJ-2.5-LF-Z require an input capacitor?
Yes - a minimum 1μF X5R or X7R ceramic capacitor must be placed between IN and GND, located within 2mm of the pins. This stabilizes input impedance, reduces high-frequency noise coupling, and improves line transient response. Larger values (up to 10μF) further enhance immunity to upstream DC/DC ripple but increase board area.
What is the purpose of the NC pin in QFN8 variants, and does TSOT23-5 have one?
The QFN8 variant has Pin 7 marked "NC" (No Connect), which is internally unconnected and must remain floating or grounded per PCB layout guidelines - it is not bonded. The TSOT23-5 package (used by MP8903DJ-2.5-LF-Z) has no NC pin; all five pins are functional: IN, GND, EN, FB, and OUT.
How does thermal shutdown behave during sustained overload?
When junction temperature reaches 155°C, the MP8903DJ-2.5-LF-Z disables the pass transistor and holds output at 0V until temperature falls to ~125°C (155°C – 30°C hysteresis). During shutdown, EN remains functional - asserting EN low forces immediate disable, while releasing EN allows automatic restart once cooled, preventing thermal cycling instability.
Is the 2.5V output trimmed at final test, and what is its initial accuracy?
Yes - the 2.5V output is factory-trimmed using laser or fuse-based calibration. Initial accuracy is ±1.0% at TA = +25°C and IOUT = 1mA, degrading to ±2.0% across –40°C to +85°C and full 150mA load range. This includes line, load, and temperature effects per Electrical Characteristics table on page 3 of Rev. 1.11 datasheet.
Can MP8903DJ-2.5-LF-Z drive a 10µF output capacitor without instability?
Yes - the MP8903DJ-2.5-LF-Z is explicitly characterized for stability with 1µF to 10µF X5R/X7R ceramic output capacitors. Phase margin remains >45° across this range when using recommended ESR (≤10mΩ). Avoid Y5V or Z5U dielectrics due to capacitance loss at temperature and bias, which may induce oscillation.
MP8903DJ-2.5-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 1.25V (2.5V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.125V @ 150mA, -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 50dB ~ 20dB (1kHz ~ 1MHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MP8903DJ-2.5-LF-Z FAQ
1.How can I place an order for MP8903DJ-2.5-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8903DJ-2.5-LF-Z 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 MP8903DJ-2.5-LF-Z reliable?
The price and inventory of MP8903DJ-2.5-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP8903DJ-2.5-LF-Z is usually 5 days.
3.What payment methods are accepted for MP8903DJ-2.5-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8903DJ-2.5-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8903DJ-2.5-LF-Z?
MP8903DJ-2.5-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8903DJ-2.5-LF-Z 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 MP8903DJ-2.5-LF-Z?
For technical support, including MP8903DJ-2.5-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8903DJ-2.5-LF-Z requirements.
6.How does Aetrix verify that MP8903DJ-2.5-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP8903DJ-2.5-LF-Z 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 MP8903DJ-2.5-LF-Z meets industry standards.
7.What is the process for return or replacement of MP8903DJ-2.5-LF-Z?
All MP8903DJ-2.5-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP8903DJ-2.5-LF-Z, 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 MP8903DJ-2.5-LF-Z part is unused and in its original packaging.
Return procedure for MP8903DJ-2.5-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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