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Monolithic Power Systems Inc. MP8903DJ-3.3-LF-Z
- Part No.:
- MP8903DJ-3.3-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP8903DJ-3.3-LF-Z.pdf
- Description:
- IC REG LIN POS ADJ 150MA TSOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,465
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Product details
Overview
MP8903DJ-3.3-LF-Z from Monolithic Power Systems is a 150mA low-dropout linear regulator in TSOT23-5 package, operating from 2.7V to 6.5V input and delivering fixed 3.3V output with ±2% accuracy. It features 100mV dropout at 100mA, thermal shutdown protection, and stable operation with low-ESR ceramic capacitors. It powers noise-sensitive analog blocks such as audio codecs in mobile handsets.
For engineers reviewing the MP8903DJ-3.3-LF-Z datasheet, MP8903DJ-3.3-LF-Z pinout, MP8903DJ-3.3-LF-Z application, or MP8903DJ-3.3-LF-Z equivalent, key selection criteria include dropout voltage at full load, FB reference voltage tolerance, EN logic thresholds, thermal resistance (θJA = 220°C/W), and compatibility with 1µF–10µF X5R/X7R output capacitors.
Technical Context
The MP8903DJ-3.3-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.
Enable control is implemented through a CMOS-compatible EN pin with 1.5V high threshold and 0.4V low threshold, supporting direct connection to IN for automatic startup. Thermal protection activates at 155°C with 30°C hysteresis, ensuring safe recovery after overload conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% - ensures stable supply for 3.3V I/O domains without external resistor network. |
| 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. |
| Quiescent Current | Typical 100µA - minimizes standby power loss in always-on subsystems like PLL bias rails. |
| PSRR @ 1kHz | 50dB - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | 155°C activation with 30°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| FB Reference Voltage | 1.222V ±0.025V - defines adjustable output accuracy when used with external divider; sets R1/R2 ratio precision. |
Pinout & Package
MP8903DJ-3.3-LF-Z is housed in a RoHS-compliant TSOT23-5 package (2.9mm × 1.6mm × 1.0mm) with exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard TSOT23 orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Power Input | Primary supply rail input; requires ≥1µF X5R/X7R ceramic bypass capacitor placed adjacent to pin. |
| 2 (GND) | Ground Reference | Analog and power ground return; must connect directly to low-impedance ground plane for stability and thermal performance. |
| 3 (EN) | Enable Control | Active-high digital enable; 1.5V min high threshold allows direct tie to IN for automatic startup; 0.4V max low threshold ensures reliable disable. |
| 4 (FB) | Feedback Input | Senses output voltage via resistive divider; internal 1.222V reference sets regulation point; high-impedance node requiring short trace routing. |
| 5 (OUT) | Regulated Output | Delivers 3.3V to load; requires ≥1µF X5R/X7R ceramic capacitor between OUT and GND for loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Architecture | PMOS pass element enables 100mV dropout at 100mA - extends usable input range in battery-fed applications. |
| Stable with Low-ESR Capacitors | Compatible with 1µF–10µF X5R/X7R ceramics - eliminates need for costly tantalum or aluminum electrolytics. |
| Precision Reference | 1.222V ±0.025V FB threshold - enables accurate adjustable outputs and tight fixed-voltage tolerance (±2%). |
| Integrated Thermal Protection | 155°C shutdown with 30°C hysteresis - provides autonomous fault recovery without external circuitry. |
| Small Footprint | TSOT23-5 package (2.9 × 1.6 mm) - saves board space in compact portable electronics like PC cards and handset modules. |
Applications
| 802.11 PC Card Power | Mobile Handset PLL Bias |
|---|---|
Use Scenario: Powers 3.3V analog front-end and baseband ICs in mini-PCI Express wireless adapters. IC Role / Device Role / Timing Role: Low-noise post-regulator supplying clean 3.3V to RF transceivers and clock buffers. Use Value: 50dB PSRR at 1kHz suppresses switching noise from host-system DC/DC, preventing EVM degradation in WLAN transmission. | Use Scenario: Supplies ultra-low-noise bias voltage to VCO and phase detector circuits in cellular RF transceivers. IC Role / Device Role / Timing Role: Fixed-output LDO providing ripple-free 3.3V reference for PLL charge pump and loop filter. Use Value: 100mV dropout ensures regulation remains active down to 3.4V input, extending talk time during Li-ion discharge below 3.5V. |
| Audio Codec Supply | Digital Camera Sensor Bias |
Use Scenario: Delivers regulated 3.3V to stereo audio DAC/ADC and headphone amplifier ICs in smartphones. IC Role / Device Role / Timing Role: Low-quiescent, low-noise power source for analog signal chain components. Use Value: Typical 100µA quiescent current minimizes battery drain during audio playback standby modes. | Use Scenario: Provides stable 3.3V bias to CMOS image sensor analog front-end and timing controller in compact cameras. IC Role / Device Role / Timing Role: Compact-area LDO powering noise-sensitive pixel readout and ADC reference circuits. Use Value: TSOT23-5 footprint (2.9 × 1.6 mm) fits within tight camera module PCB real estate constraints. |
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 rating, 6μA IQ, SOT23-3 package - no EN or FB pins; fixed-only, no adjustability. | Lacks enable control and feedback; unsuitable for sequenced power-up or adjustable output designs. | Select when minimal quiescent current and smallest possible footprint are primary; accept lack of control flexibility. |
| TCS2117-33IDBVR | 150mA rating, 120mV dropout at 100mA, SOT23-5 package - same pinout but 1.25V FB reference and higher EN threshold (1.8V). | Requires higher EN voltage; FB reference mismatch complicates replacement in existing 1.222V-divider designs. | Use only in new designs where 1.25V reference simplifies resistor selection; verify EN drive capability. |
Compared with MCP1700T-3302E/TT and TCS2117-33IDBVR, MP8903DJ-3.3-LF-Z uniquely balances 150mA capability, 100mV dropout, 1.222V FB precision, and integrated EN control in TSOT23-5 - making it optimal for space-constrained, multi-rail mobile systems requiring both flexibility and low noise.
Availability
MP8903DJ-3.3-LF-Z is available at Aetrix Electronics and suitable for 802.11 PC card power, mobile handset PLL bias, and audio codec supply requiring stable component supply across production lifecycles.
Supply support for MP8903DJ-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 power ICs, with design centers in the US, China, and Taiwan.
The MP8903 belongs to MPS's low-power linear regulator product line, engineered for noise-sensitive portable electronics where small size, low dropout, and precise voltage regulation are essential.
FAQ
What is the maximum continuous output current for MP8903DJ-3.3-LF-Z?
The MP8903DJ-3.3-LF-Z is rated for 150mA maximum continuous output current under recommended operating conditions. At this load, dropout voltage rises to approximately 125mV (for VOUT = 3.3V), and thermal limits require adequate PCB copper area due to θJA = 220°C/W. Derating is necessary above +60°C ambient.
Can MP8903DJ-3.3-LF-Z be used in adjustable-output configuration?
Yes - though configured as fixed 3.3V, the device retains the FB pin and internal 1.222V reference, allowing reconfiguration as an adjustable regulator using an external resistor divider. The sum of R1 and R2 must not exceed 100kΩ, and R2 should be 10kΩ ±1% for best accuracy.
What is the minimum input voltage required to maintain 3.3V output at 100mA?
To maintain 3.3V output at 100mA, the minimum input voltage is 3.4V, based on the specified 100mV dropout voltage. Below this, regulation fails and VOUT drops linearly with VIN. For margin, design with VIN ≥ 3.45V at full load across temperature and tolerance.
Does MP8903DJ-3.3-LF-Z require an input capacitor?
Yes - a minimum 1µF X5R or X7R ceramic capacitor must be placed between IN and GND, located as close as possible to the IN pin. This stabilizes input impedance, filters upstream noise, and supports transient response during line changes.
How does the EN pin behave during power-up?
The EN pin is active-high with 1.5V typical threshold. When tied directly to IN, the device powers up immediately upon VIN reaching ~1.5V. No external pull-up is needed, and the 0.1–1μA EN bias current ensures negligible impact on system power sequencing.
Is the TSOT23-5 package thermally enhanced?
No - unlike QFN8 variants, the TSOT23-5 package (MP8903DJ series) lacks an exposed thermal pad. Its θJA is 220°C/W on a standard 4-layer JEDEC board, so thermal design must rely on copper area under pins 1 (IN), 2 (GND), and 5 (OUT), especially GND.
What is the guaranteed FB reference voltage tolerance over temperature?
The FB reference voltage is guaranteed at 1.194V to 1.249V over –40°C to +85°C ambient, corresponding to ±2.2% total variation. This directly impacts output accuracy in adjustable configurations and contributes to the ±2% fixed-output tolerance specification.
MP8903DJ-3.3-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 (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:
- TSOT-23-5
MP8903DJ-3.3-LF-Z FAQ
1.How can I place an order for MP8903DJ-3.3-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8903DJ-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 MP8903DJ-3.3-LF-Z reliable?
The price and inventory of MP8903DJ-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 MP8903DJ-3.3-LF-Z is usually 5 days.
3.What payment methods are accepted for MP8903DJ-3.3-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8903DJ-3.3-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8903DJ-3.3-LF-Z?
MP8903DJ-3.3-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8903DJ-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 MP8903DJ-3.3-LF-Z?
For technical support, including MP8903DJ-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 MP8903DJ-3.3-LF-Z requirements.
6.How does Aetrix verify that MP8903DJ-3.3-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP8903DJ-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 MP8903DJ-3.3-LF-Z meets industry standards.
7.What is the process for return or replacement of MP8903DJ-3.3-LF-Z?
All MP8903DJ-3.3-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP8903DJ-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 MP8903DJ-3.3-LF-Z part is unused and in its original packaging.
Return procedure for MP8903DJ-3.3-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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