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Monolithic Power Systems Inc. MP8903DJ-2.85-LF-Z
- Part No.:
- MP8903DJ-2.85-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP8903DJ-2.85-LF-Z.pdf
- Description:
- IC REG LIN POS ADJ 150MA TSOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,380
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Product details
Overview
MP8903DJ-2.85-LF-Z from Monolithic Power Systems is a 150mA low-dropout linear regulator in TSOT23-5 package, delivering fixed 2.85V output with ±2% accuracy across –40°C to +85°C. It operates from 2.7V–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-2.85-LF-Z datasheet, MP8903DJ-2.85-LF-Z pinout, MP8903DJ-2.85-LF-Z application, or MP8903DJ-2.85-LF-Z equivalent, key selection criteria include dropout voltage at 150mA load, FB threshold (1.222V), EN logic compatibility (1.5V high/0.4V low), thermal shutdown trigger (155°C), and stability with 1µF–10µF X5R/X7R output capacitors.
Technical Context
The MP8903DJ-2.85-LF-Z uses a PMOS pass transistor architecture enabling low dropout and inherent reverse-current blocking. Its internal 1.222V bandgap reference feeds a precision error amplifier that regulates output via feedback from the FB pin - configured as fixed 2.85V by factory-trimmed resistor divider.
Thermal protection activates at 155°C junction temperature with 30°C hysteresis, and the EN pin supports controlled startup or power sequencing. The device requires no external compensation and remains stable with low-ESR ceramic capacitors as small as 1µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85V ±2% over –40°C to +85°C; enables direct replacement of 2.8V–2.9V rail without resistor tuning. |
| Dropout Voltage | 100mV at 100mA load; allows operation down to 2.95V input while maintaining regulation - critical for single-cell Li-ion systems. |
| Input Voltage Range | 2.7V to 6.5V; supports wide-input battery-powered and USB-fed applications without external pre-regulation. |
| Quiescent Current | Typical 135µA at no load; minimizes standby power loss in always-on subsystems like PLL bias rails. |
| 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. |
| Enable Threshold | EN high ≥1.5V, low ≤0.4V; compatible with 1.8V/3.3V GPIOs and supports simple pull-up-to-IN startup. |
Pinout & Package
MP8903DJ-2.85-LF-Z is housed in a RoHS-compliant TSOT23-5 package (2.9mm × 1.6mm × 1.0mm), optimized for space-constrained portable designs. Exposed pad is not present; thermal dissipation relies on PCB copper area connected to GND pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Power Input | Primary supply source (2.7V–6.5V); must be bypassed with ≥1µF X5R/X7R capacitor near pin. |
| 2 - GND | Ground Reference | Analog and power ground return; connects internally to exposed thermal pad (not present in TSOT23-5). |
| 3 - EN | Enable Control | Active-high digital enable; tie to IN for automatic startup or drive with MCU GPIO for sequenced power control. |
| 4 - FB | Feedback Input | Senses regulated output via internal 2.85V divider; unused in fixed-version but must remain unconnected per datasheet. |
| 5 - OUT | Regulated Output | Delivers 2.85V ±2%; requires ≥1µF X5R/X7R output capacitor placed adjacent to pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Architecture | PMOS pass element enables 100mV dropout at 100mA - extends usable battery life in 2.85V rail applications. |
| Precision Fixed Output | Factory-trimmed 2.85V output with ±2% tolerance eliminates external resistor selection and layout complexity. |
| Thermal Protection with Hysteresis | 155°C shutdown with 30°C recovery margin prevents thermal cycling and ensures safe fault recovery. |
| Stability with Small Capacitors | Guaranteed stable with 1µF–10µF X5R/X7R ceramic output caps - reduces BOM count and board area vs. electrolytic solutions. |
| Low-Noise Operation | 50dB PSRR at 1kHz suppresses ripple from noisy switchers, making it suitable for sensitive analog circuitry like PLL VCOs. |
Applications
| Mobile Handset PLL Power | Audio Codec Bias Supply |
|---|---|
Use Scenario: Powers phase-locked loop (PLL) circuits in cellular handsets requiring ultra-low-noise, tightly regulated 2.85V bias. IC Role / Device Role / Timing Role: Provides clean, low-ripple VCO tuning voltage and reference bias for frequency synthesis blocks. Use Value: 50dB PSRR at 1kHz and ±2% output accuracy ensure minimal phase noise degradation and stable lock time. | Use Scenario: Supplies bias voltage to stereo audio codecs in smartphones and wearables operating from single Li-ion cells. IC Role / Device Role / Timing Role: Delivers stable 2.85V reference for ADC/DAC analog front-ends and headphone amplifiers. Use Value: 100mV dropout enables full codec operation down to 2.95V input - extending usable battery range before brownout. |
| 802.11 PC Card Power | IoT Sensor Node Core Rail |
Use Scenario: Regulates 2.85V supply for IEEE 802.11b/g/n WLAN baseband and RF transceivers in mini-PCIe modules. IC Role / Device Role / Timing Role: Acts as primary low-noise post-regulator for RF ICs sensitive to supply-induced jitter and EVM degradation. Use Value: Thermal shutdown (155°C) protects against overheating during high-throughput data bursts in enclosed enclosures. | Use Scenario: Powers ultra-low-power microcontrollers and environmental sensors in battery-operated IoT edge nodes. IC Role / Device Role / Timing Role: Serves as main system rail for ARM Cortex-M0+ MCUs and I²C/SPI sensor interfaces. Use Value: 135µA quiescent current and 0.1µA shutdown current minimize self-discharge during multi-year sleep cycles. |
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 |
|---|---|---|---|
| Torex XC6206P282MR | 2.8V fixed output, 100mA rating, 150mV dropout at 100mA, SOT-23-5 package | Limited to 100mA load; insufficient for 150mA peak demands in audio codec burst modes | Select only if load never exceeds 100mA and 0.1V higher dropout is acceptable. |
| Diodes Inc. AP2204K-2.8TRG1 | 2.8V fixed output, 150mA rating, 300mV dropout at 150mA, SOT-23-5 package | Higher dropout reduces usable input range - requires ≥3.1V input to sustain 2.8V output at full load | Prefer when thermal margin is abundant and input voltage consistently exceeds 3.3V. |
Compared with XC6206P282MR and AP2204K-2.8TRG1, MP8903DJ-2.85-LF-Z delivers tighter 2.85V output matching common PLL reference requirements, lower dropout for wider input headroom, and integrated thermal hysteresis for robust fault recovery - making it optimal for space- and noise-sensitive portable RF/analog subsystems.
Availability
MP8903DJ-2.85-LF-Z is available at Aetrix Electronics and suitable for mobile handset PLL power, audio codec bias supply, and 802.11 PC card applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MP8903DJ-2.85-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 power ICs, with core expertise in DC/DC converters, LDOs, motor drivers, and LED drivers.
The MP8903 belongs to MPS's precision low-noise LDO product line, engineered specifically for powering noise-sensitive RF and audio circuits in portable and wireless devices where regulation accuracy, PSRR, and thermal reliability are non-negotiable.
FAQ
Can MP8903DJ-2.85-LF-Z be used in adjustable-output mode?
No. MP8903DJ-2.85-LF-Z is factory-configured for fixed 2.85V output using an internal resistor divider. The FB pin is not functional in this variant and must remain unconnected. For adjustable operation, select MP8903DJ-XX versions marked "-X.X" without fixed-voltage suffix or use MP8903DX series with QFN8 package.
What is the minimum input voltage required to maintain 2.85V output at 150mA load?
Based on the 125mV dropout at 150mA (VOUT = 4V condition) and typical 130mV at 2.85V output, the minimum input is 2.98V. However, the datasheet specifies guaranteed operation only above 2.7V input - so 2.98V is the practical minimum for full-load regulation at room temperature.
Is an input capacitor mandatory, and what value is recommended?
Yes. A ceramic capacitor of 1µF–10µF (X5R or X7R dielectric) is mandatory between IN and GND. Values ≥2.2µF improve line transient response. Placement within 2mm of the IN pin is required to prevent oscillation and ensure stability under dynamic load conditions.
Does MP8903DJ-2.85-LF-Z require an output capacitor, and what type is supported?
Yes. A 1µF–10µF X5R or X7R ceramic capacitor is required between OUT and GND for stability. Other dielectrics (e.g., Y5V) are not recommended due to large capacitance drift over temperature and bias, which may cause instability or poor transient response.
How does the EN pin behave during power-up, and can it be left floating?
The EN pin must never be left floating. It has 0.01–1µA bias current and undefined logic state when unconnected. For automatic startup, connect EN directly to IN. For controlled enable, drive with a clean 1.8V/3.3V GPIO - logic high ≥1.5V enables, ≤0.4V disables.
What is the thermal resistance θJA for MP8903DJ-2.85-LF-Z in TSOT23-5 package?
The junction-to-ambient thermal resistance is 220°C/W on a standard 4-layer JEDEC test board. This value assumes 1in² of 1oz copper connected to the GND pin. Real-world PCB layout - especially GND copper area and airflow - strongly affects actual thermal performance.
Is MP8903DJ-2.85-LF-Z compliant with automotive AEC-Q200 standards?
No. MP8903DJ-2.85-LF-Z is rated for industrial temperature range (–40°C to +85°C) and is not qualified to AEC-Q200. For automotive applications, consult MPS's automotive-grade LDO portfolio such as MPQ8903 series, which undergo extended temperature and stress testing.
MP8903DJ-2.85-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 (2.85V)
- 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-2.85-LF-Z FAQ
1.How can I place an order for MP8903DJ-2.85-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8903DJ-2.85-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-2.85-LF-Z reliable?
The price and inventory of MP8903DJ-2.85-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-2.85-LF-Z is usually 5 days.
3.What payment methods are accepted for MP8903DJ-2.85-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8903DJ-2.85-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8903DJ-2.85-LF-Z?
MP8903DJ-2.85-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8903DJ-2.85-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-2.85-LF-Z?
For technical support, including MP8903DJ-2.85-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8903DJ-2.85-LF-Z requirements.
6.How does Aetrix verify that MP8903DJ-2.85-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP8903DJ-2.85-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-2.85-LF-Z meets industry standards.
7.What is the process for return or replacement of MP8903DJ-2.85-LF-Z?
All MP8903DJ-2.85-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP8903DJ-2.85-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-2.85-LF-Z part is unused and in its original packaging.
Return procedure for MP8903DJ-2.85-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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