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Monolithic Power Systems Inc. MP8903DG-2.85-LF-Z
- Part No.:
- MP8903DG-2.85-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP8903DG-2.85-LF-Z.pdf
- Description:
- IC REG LIN POS ADJ 150MA 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,603
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Product details
Overview
MP8903DG-2.85-LF-Z from Monolithic Power Systems is a fixed-output 2.85V, 150mA low-dropout linear regulator with 2% output accuracy, 100mV dropout at 100mA, thermal shutdown protection, and operation from 2.7V to 6.5V input-designed for powering mobile handset PLLs and audio codecs where stable low-noise bias is critical.
For engineers reviewing the MP8903DG-2.85-LF-Z datasheet, MP8903DG-2.85-LF-Z pinout, MP8903DG-2.85-LF-Z application, or MP8903DG-2.85-LF-Z equivalent, key selection criteria include dropout voltage under load, FB threshold stability (1.222V), thermal shutdown threshold (155°C), PSRR at 1MHz (20dB), and compatibility with low-ESR ceramic output capacitors (1–10µF).
Technical Context
The MP8903DG-2.85-LF-Z uses a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current blocking. Its internal bandgap reference (1.222V ±0.028V) feeds a precision error amplifier that regulates output via feedback from the FB pin, supporting both fixed-output (2.85V) and adjustable configurations.
Thermal protection activates at 155°C with 30°C hysteresis, and the device remains stable with X5R/X7R ceramic output capacitors ≥1µF-no external compensation required. Shutdown current is ≤1μA when EN is pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85V ±2% - ensures consistent bias for RF PLL VCOs without external resistor network. |
| Dropout Voltage | 100mV at 100mA - enables regulation down to VIN = 2.95V, critical for single-cell Li-ion (3.0V min) systems. |
| Input Voltage Range | 2.7V to 6.5V - supports direct connection to USB 5V, Li-ion battery rails, or post-regulated 3.3V/5V supplies. |
| PSRR @ 1MHz | 20dB - suppresses high-frequency switching noise from adjacent DC-DC converters feeding shared input rails. |
| FB Threshold Voltage | 1.222V ±0.028V - sets precise output via R1/R2 divider; enables accurate adjustable outputs from 1.25V to 5V. |
| Thermal Shutdown | 155°C with 30°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Quiescent Current | Typical 135μA at no load - minimizes standby power in always-on audio codec or sensor bias circuits. |
Pinout & Package
MP8903DG-2.85-LF-Z is housed in a thermally enhanced QFN8 (2mm × 2mm, 0.4mm height) package with exposed thermal pad. The 8-pin layout optimizes thermal dissipation and EMI performance for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | GND | Power ground return path; must be connected to large copper pour for thermal conduction and noise rejection. |
| 3, 4 | IN | Main input supply (2.7–6.5V); requires ≥1µF X5R/X7R ceramic bypass capacitor placed adjacent to pin. |
| 5, 6 | OUT | Regulated 2.85V output; connects to load and ≥1µF output capacitor; trace routing affects transient response. |
| 7 | NC | No-connect pin - left unconnected per datasheet; not internally bonded or electrically active. |
| 8 | FB | Feedback input referenced to 1.222V; tied directly to OUT for fixed 2.85V operation; open for adjustable mode. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Architecture | PMOS pass element enables 100mV dropout at 100mA - extends usable battery life in brownout conditions. |
| Stable with Low-ESR Capacitors | Operates reliably with 1–10µF X5R/X7R ceramics - eliminates need for costly tantalum or aluminum electrolytics. |
| Enable Control Logic | EN pin (pin 3) accepts 1.5V logic-high to activate regulator - supports system-level power sequencing and sleep-mode control. |
| Thermal Protection with Hysteresis | Shuts down at 155°C and re-enables at 125°C - prevents thermal runaway while allowing safe recovery after cooling. |
| Precision Reference | 1.222V ±0.028V FB threshold - enables <±1% output accuracy across temperature when using 1% resistors in adjustable mode. |
Applications
| Mobile Handset PLL Power | Audio Codec Bias Supply |
|---|---|
Use Scenario: Providing clean, low-noise 2.85V bias to phase-locked loop (PLL) circuits in LTE/Wi-Fi transceivers. IC Role / Device Role / Timing Role: Low-noise LDO delivering stable reference voltage to VCO tuning port and charge pump circuitry. Use Value: 20dB PSRR at 1MHz suppresses switching noise from nearby buck converters, reducing PLL phase jitter by up to 30%. | Use Scenario: Powering analog front-end (AFE) and DAC sections of stereo audio codecs in smartphones and wearables. IC Role / Device Role / Timing Role: Primary analog supply rail decoupling sensitive audio signal paths from noisy digital domains. Use Value: 2% output accuracy and <135μA quiescent current ensure consistent SNR performance and extended battery runtime. |
| 802.11 PC Card Power | IoT Sensor Node Reference |
Use Scenario: Regulating 2.85V for RF front-end ICs and baseband processors in legacy PCMCIA Wi-Fi cards. IC Role / Device Role / Timing Role: Compact, thermally robust LDO replacing larger TO-92 regulators in space-limited add-in cards. Use Value: QFN8 (2×2mm) footprint saves >60% board area vs. TSOT23-5; 1.6W θJA = 80°C/W enables full 150mA load at +70°C ambient. | Use Scenario: Supplying precision reference voltage to low-power environmental sensors (e.g., humidity, temperature) in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Always-on bias source maintaining sensor calibration stability during deep-sleep cycles. Use Value: 0.1–1μA shutdown current (VEN = 0V) extends 10-year battery life in coin-cell-powered deployments. |
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-285I/TT | 100mA max output, 6μA IQ, SOT-23-3 package - lacks EN pin and FB adjustability. | Suitable only for ultra-low-power always-on rails; cannot support enable-controlled sequencing. | Select when minimum quiescent current is primary requirement and 150mA load headroom is unnecessary. |
| Torex XC6206P282MR-G | 150mA output, 2.8V fixed, 1.2V FB threshold, SOT-25 package - lower PSRR (15dB @ 1MHz) and no thermal hysteresis. | Limited noise rejection in RF-sensitive designs; thermal shutdown recovery may cause oscillation under marginal heatsinking. | Select for cost-sensitive consumer applications where RF performance and thermal reliability are secondary. |
Compared with MCP1700T-285I/TT and XC6206P282MR-G, MP8903DG-2.85-LF-Z uniquely combines 150mA capability, 20dB 1MHz PSRR, EN control, and thermally robust hysteresis-making it optimal for RF-bias and audio AFE applications demanding simultaneous performance, density, and reliability.
Availability
MP8903DG-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, RoHS-compliant packaging, and long-term lifecycle continuity.
Supply support for MP8903DG-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP8903 belongs to MPS's low-noise LDO product line, engineered specifically for noise-sensitive RF and audio subsystems in portable electronics where compact size, thermal resilience, and precision regulation are mandatory.
FAQ
What is the maximum continuous output current for MP8903DG-2.85-LF-Z?
The MP8903DG-2.85-LF-Z delivers up to 150mA continuously under recommended operating conditions (TA ≤ +85°C, θJA = 80°C/W on 4-layer board). At 100mA, dropout is guaranteed ≤100mV. Exceeding 150mA triggers thermal shutdown at 155°C.
Can MP8903DG-2.85-LF-Z be used in adjustable-output mode?
Yes - though configured as 2.85V fixed, the FB pin allows conversion to adjustable mode by connecting an external resistor divider (R1/R2) between OUT and FB. The FB threshold is 1.222V, and R1+R2 must not exceed 100kΩ for accuracy.
What is the recommended input and output capacitor configuration?
Use ≥1µF X5R or X7R ceramic capacitors for both IN and OUT pins, placed as close as possible to the respective pins. For improved transient response, add a 100nF feed-forward capacitor in parallel with R1 in adjustable mode.
Does MP8903DG-2.85-LF-Z require external compensation?
No - the MP8903DG-2.85-LF-Z is internally compensated and stable with 1–10µF ceramic output capacitors. No external compensation components are needed, simplifying layout and reducing BOM count.
What is the thermal resistance (θJA) of the QFN8 package?
The QFN8 (2×2mm) package has θJA = 80°C/W and θJC = 16°C/W when mounted on a JEDEC-standard 4-layer board. This enables 1.6W maximum power dissipation at +25°C ambient, supporting full 150mA load in typical handheld thermal environments.
Is the NC pin (Pin 7) required to be grounded or left floating?
Pin 7 is a true no-connect (NC) terminal - it is not bonded internally and must remain unconnected. Grounding or routing to any net violates the datasheet and may compromise thermal or electrical performance.
What is the shutdown current when EN is pulled low?
When EN is driven below 0.4V, shutdown current is guaranteed ≤1μA (typical 0.1μA) at VIN = 5V and TA = +25°C. This ultra-low leakage supports multi-year battery life in always-off system states.
MP8903DG-2.85-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-TFDFN Exposed Pad
- 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:
- 8-QFN (2x2)
MP8903DG-2.85-LF-Z FAQ
1.How can I place an order for MP8903DG-2.85-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8903DG-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 MP8903DG-2.85-LF-Z reliable?
The price and inventory of MP8903DG-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 MP8903DG-2.85-LF-Z is usually 5 days.
3.What payment methods are accepted for MP8903DG-2.85-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8903DG-2.85-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8903DG-2.85-LF-Z?
MP8903DG-2.85-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8903DG-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 MP8903DG-2.85-LF-Z?
For technical support, including MP8903DG-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 MP8903DG-2.85-LF-Z requirements.
6.How does Aetrix verify that MP8903DG-2.85-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP8903DG-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 MP8903DG-2.85-LF-Z meets industry standards.
7.What is the process for return or replacement of MP8903DG-2.85-LF-Z?
All MP8903DG-2.85-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP8903DG-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 MP8903DG-2.85-LF-Z part is unused and in its original packaging.
Return procedure for MP8903DG-2.85-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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