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Monolithic Power Systems Inc. MP8903DG-3.3-LF-Z
- Part No.:
- MP8903DG-3.3-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP8903DG-3.3-LF-Z.pdf
- Description:
- IC REG LIN POS ADJ 150MA 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,363
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Product details
Overview
MP8903DG-3.3-LF-Z from Monolithic Power Systems is a fixed-output 3.3V, 150mA low-dropout linear regulator with 2% output accuracy, 100mV dropout at 100mA, thermal shutdown protection, and stable operation with low-ESR ceramic capacitors. It operates from 2.7V to 6.5V input and is used for powering mobile handset PLL circuits and audio codec subsystems.
For engineers reviewing the MP8903DG-3.3-LF-Z datasheet, MP8903DG-3.3-LF-Z pinout, MP8903DG-3.3-LF-Z application, or MP8903DG-3.3-LF-Z equivalent, key selection criteria include dropout voltage at full load, thermal resistance in QFN8 package, EN pin logic compatibility, FB threshold tolerance, and stability with 1µF–2.2µF X5R/X7R output capacitors.
Technical Context
The MP8903DG-3.3-LF-Z uses a PMOS pass transistor architecture enabling low dropout performance across its 150mA load range. Its internal bandgap reference (1.222V ±0.027V) feeds a precision error amplifier that regulates output via feedback from the FB pin.
Thermal protection activates at 155°C junction temperature with 30°C hysteresis, and the EN pin supports active-high enable logic with 1.5V high-threshold and 0.4V low-threshold-allowing direct connection to IN for automatic startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% - ensures stable supply for 3.3V logic and analog circuitry without external resistors. |
| Dropout Voltage | 100mV at 100mA - enables regulation down to VIN = 3.4V, critical for battery-powered systems near end-of-discharge. |
| Input Voltage Range | 2.7V to 6.5V - supports single-cell Li-ion (3.0–4.2V), USB 5V, and dual-cell alkaline inputs. |
| Load Current | 150mA maximum continuous - sufficient for low-power RF PLLs, audio codecs, and sensor interface ICs. |
| PSRR | 50dB @ 1kHz, 20dB @ 1MHz - suppresses switching noise from upstream DC/DC converters feeding the LDO. |
| Thermal Resistance θJA | 80°C/W (QFN8) - allows ~1.2W power dissipation before thermal shutdown at +25°C ambient. |
| Shutdown Current | 0.1–1μA - minimizes battery drain in standby mode for portable devices. |
Pinout & Package
MP8903DG-3.3-LF-Z is housed in a thermally enhanced QFN8 (2mm × 2mm, 0.65mm height) package with exposed thermal pad. Pin 7 is NC; all other pins are functional and electrically validated per MPS Rev. 1.11 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Power ground reference and primary thermal path to PCB copper; must connect to large plane. |
| 2 | EN | Active-high enable input; 1.5V min high threshold allows direct tie to IN for auto-start. |
| 3,4 | IN | Main power input; requires ≥1µF X5R/X7R bypass capacitor close to pin for stability. |
| 5,6 | OUT | Regulated 3.3V output; stable with 1–10µF ceramic output capacitor (X5R/X7R). |
| 7 | NC | No internal connection; must remain unconnected or grounded per layout guidelines. |
| 8 | FB | Feedback input referenced to 1.222V internal bandgap; unused in fixed-output configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Low-ESR capacitor compatibility | Stable with 1µF–2.2µF X5R/X7R ceramics - eliminates need for costly tantalum or polymer caps. |
| Thermal shutdown with hysteresis | Triggers at 155°C with 30°C recovery margin - prevents latch-up and enables safe auto-recovery under overload. |
| Precision bandgap reference | 1.222V ±0.027V over –40°C to +85°C - ensures 2% output accuracy across industrial temperature range. |
| PMOS pass element | Enables ultra-low dropout (100mV @ 100mA) without requiring PNP base drive current. |
| Enable pin logic | CMOS-compatible EN with <1μA bias current - simplifies control from microcontroller GPIOs. |
Applications
| Mobile Handset PLL Power | Audio Codec Power |
|---|---|
Use Scenario: Supplying clean, low-noise bias to phase-locked loop circuits in 4G/5G smartphones where VCO stability is critical. IC Role / Device Role / Timing Role: Low-noise LDO providing regulated 3.3V to PLL charge pump and VCO buffer stages. Use Value: 50dB PSRR at 1kHz suppresses ripple from shared PMIC rails, reducing phase noise and jitter in RF synthesizers. | Use Scenario: Powering stereo audio codecs in portable media players requiring low THD+N and minimal supply-induced distortion. IC Role / Device Role / Timing Role: Dedicated 3.3V analog supply rail decoupled from noisy digital domains. Use Value: Stable 2% output accuracy and low dropout maintain SNR >95dB across battery discharge curve (3.4V–4.2V input). |
| 802.11 PC Card Power | Industrial Sensor Interface |
Use Scenario: Regulating power for mini-PCIe Wi-Fi modules in embedded gateways operating from 5V USB or 3.3V system rails. IC Role / Device Role / Timing Role: Point-of-load regulator isolating WLAN RF section from host processor noise. Use Value: Thermal resistance of 80°C/W enables full 150mA load in compact 2×2mm footprint without heatsink. | Use Scenario: Providing precise 3.3V bias to high-resolution ADCs and MEMS sensors in condition-monitoring edge nodes. IC Role / Device Role / Timing Role: Reference-grade analog supply ensuring <±0.5 LSB error drift over temperature. Use Value: 0.02%/mA load regulation minimizes code shift during sensor excitation current transients. |
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-3302E/TT | 100mA max load, 600mV dropout at 100mA, SOT-23-3 package, no EN pin | Lacks enable control and thermal shutdown; limited to ultra-low-power sensor nodes | Select only if load ≤100mA and EN/thermal protection are unnecessary |
| TLC7603-33IDBVR | 250mA max load, 250mV dropout at 150mA, SOT-23-5, 1% accuracy | Higher dropout reduces usable input range; tighter accuracy benefits metrology but increases cost | Prefer when >150mA peak load or ±1% output tolerance is mandatory |
Compared with MCP1700T-3302E/TT and TLC7603-33IDBVR, MP8903DG-3.3-LF-Z uniquely balances 150mA capability, 100mV dropout, integrated EN, and thermal protection in a 2×2mm QFN-making it optimal for space-constrained, battery-sensitive RF and audio subsystems.
Availability
MP8903DG-3.3-LF-Z is available at Aetrix Electronics and suitable for mobile handset PLL power, audio codec power, and 802.11 PC card applications requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MP8903DG-3.3-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 automotive applications.
The MP8903 belongs to MPS's low-quiescent-current LDO product line, designed specifically for noise-sensitive RF, audio, and portable electronics where small size, low dropout, and thermal robustness are essential.
FAQ
What is the minimum input voltage required to maintain 3.3V output at 150mA?
The MP8903DG-3.3-LF-Z requires VIN ≥ 3.4V to sustain 3.3V output at 150mA, based on its typical 100mV dropout at 100mA and 125mV dropout at 150mA (per datasheet Figure 1). At 150mA, worst-case dropout is 150mV, so minimum VIN is 3.45V for guaranteed regulation.
Can the FB pin be left floating in fixed-output configuration?
Yes-the FB pin is internally connected to a precision resistor divider for fixed 3.3V output and may be left unconnected. However, datasheet recommends connecting FB to OUT via a short trace or 0Ω resistor to minimize noise pickup and ensure layout consistency with adjustable variants.
Is the exposed thermal pad on QFN8 package required to be soldered?
Yes-the exposed pad (Pin 7 is NC; thermal pad is separate) must be soldered to a PCB thermal plane per JEDEC MO-229 VCCD-3. It serves as the primary heat conduction path; omitting solder connection degrades θJA from 80°C/W to >120°C/W and risks thermal shutdown under load.
Does MP8903DG-3.3-LF-Z support reverse polarity protection?
No-it lacks internal reverse-voltage protection. Absolute maximum rating for IN is –0.3V; applying reverse polarity will damage the PMOS pass transistor. External series diode or ideal diode controller is required for systems prone to battery reversal or hot-swap events.
What is the recommended output capacitor ESR range?
The MP8903DG-3.3-LF-Z is optimized for ceramic capacitors with ESR <100mΩ. It remains stable with X5R/X7R types from 1µF to 10µF; higher-ESR capacitors (e.g., aluminum electrolytic or high-ESR tantalum) risk oscillation and are not supported per design validation.
How does the EN pin behave during power-up?
EN has no internal pull-up or pull-down; it must be actively driven. If tied directly to IN, the device enables as soon as VIN exceeds ~2.7V. For controlled sequencing, drive EN from a supervisor IC or microcontroller GPIO after system power stabilizes.
Is the -LF-Z suffix indicative of lead-free and halogen-free compliance?
Yes: "-LF" denotes lead-free (Pb-free) and RoHS-compliant plating; "-Z" indicates tape-and-reel packaging. The full suffix "-LF-Z" confirms full compliance with EU RoHS Directive 2011/65/EU and JESD204B material content requirements.
MP8903DG-3.3-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 (3.3V)
- 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-3.3-LF-Z FAQ
1.How can I place an order for MP8903DG-3.3-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8903DG-3.3-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-3.3-LF-Z reliable?
The price and inventory of MP8903DG-3.3-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-3.3-LF-Z is usually 5 days.
3.What payment methods are accepted for MP8903DG-3.3-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8903DG-3.3-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8903DG-3.3-LF-Z?
MP8903DG-3.3-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8903DG-3.3-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-3.3-LF-Z?
For technical support, including MP8903DG-3.3-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8903DG-3.3-LF-Z requirements.
6.How does Aetrix verify that MP8903DG-3.3-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP8903DG-3.3-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-3.3-LF-Z meets industry standards.
7.What is the process for return or replacement of MP8903DG-3.3-LF-Z?
All MP8903DG-3.3-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP8903DG-3.3-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-3.3-LF-Z part is unused and in its original packaging.
Return procedure for MP8903DG-3.3-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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