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Monolithic Power Systems Inc. MP2303DN-LF
- Part No.:
- MP2303DN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2303DN-LF.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:1,089
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Product details
Overview
MP2303DN-LF from Monolithic Power Systems is a monolithic synchronous buck regulator integrating high- and low-side N-channel MOSFETs, delivering 3A continuous output current across a 4.75V–28V input range with fixed 340kHz switching frequency and 0.8V feedback reference voltage. It supports adjustable output from 0.8V to 25V, features cycle-by-cycle overcurrent protection, programmable soft-start, and operates from –40°C to +85°C in an 8-pin SOIC-EP package - used in notebook power rails and distributed DC/DC pre-regulation.
For engineers reviewing the MP2303DN-LF datasheet, MP2303DN-LF pinout, MP2303DN-LF application, or MP2303DN-LF equivalent, key selection criteria include input UVLO threshold (3.8–4.3V), EN enable logic (1.1–2.0V turn-on), thermal shutdown (160°C), and compatibility with low-ESR ceramic output capacitors for stable 5V/3A conversion.
Technical Context
The MP2303DN-LF implements current-mode control with internal transconductance error amplifier (GEA = 550–1100 μA/V) and COMP pin-based loop compensation. Its functional block includes integrated 125mΩ high- and low-side MOSFETs, a 5V internal regulator for bootstrap drive, and OVP comparator tripped at 0.9–1.0V on FB.
It uses a fixed-frequency oscillator (340kHz typ., 270–400kHz over temperature) with minimum on-time of 220ns and maximum duty cycle of 90%. The BS–SW bootstrap capacitor enables high-side gate drive above VIN, while EN pin provides digital shutdown with 1μA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports sustained load in compact notebook and industrial DC/DC systems without external current-sense resistors. |
| Input Voltage Range | 4.75V to 28V - accommodates wide-input industrial supplies and automotive battery-derived rails before regulation. |
| Feedback Voltage | 0.800V ±2% - sets precise output via resistor divider; enables 0.8V–25V adjustable VOUT with <±1% regulation error over temperature. |
| Switching Frequency | 340kHz fixed - balances EMI control, inductor size, and efficiency; stable across –40°C to +85°C ambient. |
| Efficiency | Up to 95% - achieved using synchronous rectification and low RDS(ON) (125mΩ each) MOSFETs, minimizing conduction loss at full load. |
| Shutdown Current | 0.3–3.0μA - enables ultra-low-power standby in battery-backed or always-on embedded systems. |
| Thermal Shutdown | 160°C junction - protects die during overload or poor PCB thermal design; auto-recovery after cooldown. |
Pinout & Package
MP2303DN-LF uses an 8-pin SOIC-EP (SOIC8E) package with exposed thermal pad, optimized for board-level heat dissipation (θJA = 50°C/W, θJC = 10°C/W). Pin 4 is GND and must be connected to the exposed pad for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BS) | Bootstrap Supply Input | Drives high-side MOSFET gate above VIN; requires ≥0.01μF capacitor from BS to SW to sustain gate voltage during high-duty cycles. |
| 2 (IN) | Main Power Input | Accepts 4.75–28V supply; must be bypassed with low-ESR ceramic capacitor near IC to suppress switching noise and supply ripple. |
| 3 (SW) | Power Switch Node | Connects to inductor and bootstrap capacitor; carries high di/dt; routing must minimize loop area to reduce EMI and voltage spikes. |
| 4 (GND) | Ground Reference & Thermal Pad | Primary return path and thermal interface; exposed pad must be soldered to large copper pour for thermal reliability and noise immunity. |
| 5 (FB) | Feedback Input | Senses regulated output via resistive divider; 0.8V reference enables accurate VOUT setting; sensitive to noise - keep trace short and shielded. |
| 6 (COMP) | Loop Compensation Output | Connects to RC network (e.g., 5.6kΩ + 4.7nF) to stabilize control loop; location of pole-zero placement determines transient response and phase margin. |
| 7 (EN) | Enable Control Input | Digital ON/OFF control: >2.7V enables, <1.1V disables; 220mV hysteresis prevents chatter near threshold; pull-up to IN enables automatic startup. |
| 8 (SS) | Soft-Start Timing Input | Connects to capacitor to ground; 6μA internal current charges it linearly - sets ramp time (e.g., 100nF → ~13ms) to limit inrush current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFETs | 125mΩ high- and low-side N-channel switches eliminate external FETs and gate drivers, reducing BOM count and layout complexity. |
| Programmable Soft-Start | Capacitor-controlled ramp (6μA constant current) prevents input inrush and output overshoot during power-up in multi-rail systems. |
| Cycle-by-Cycle Overcurrent Protection | Monitors switch current every cycle; limits peak current to 4.3–8.3A depending on temperature - avoids thermal runaway under short-circuit. |
| Stable with Ceramic Output Capacitors | Compensated for low-ESR ceramics (X5R/X7R); eliminates need for bulk electrolytics and simplifies filtering in space-constrained designs. |
| Input UVLO with Hysteresis | Turns off below 3.5–4.7V (rising) with 210mV hysteresis - prevents erratic operation during brown-out or cold cranking conditions. |
Applications
| Industrial Distributed Power | Notebook Computer Core Rail |
|---|---|
|
Use Scenario: Point-of-load conversion in PLC I/O modules requiring clean 5V/3A from 24V field bus. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing isolated, efficient, and thermally robust DC/DC conversion. Use Value: 95% peak efficiency and SOIC-EP thermal pad enable convection-cooled operation in sealed enclosures without heatsinks. |
Use Scenario: Main 5V system rail in ultraportable notebooks powered from single-cell Li-ion or adapter input. IC Role / Device Role / Timing Role: Pre-regulator stepping down 12–20V adapter or battery voltage to stable 5V for USB, display, and peripheral subsystems. Use Value: 340kHz fixed frequency allows small 10–15μH inductors and ceramic caps, enabling <1.5cm² solution size on dense motherboard layouts. |
| Pre-Regulator for Linear Regulators | Automotive Infotainment Power |
|
Use Scenario: Generating 3.3V intermediate rail feeding LDOs for FPGA I/O banks or sensor interfaces. IC Role / Device Role / Timing Role: High-efficiency step-down stage preceding low-noise linear regulators to minimize power loss and heat generation. Use Value: Adjustable 0.8V–25V output and 0.8V feedback reference allow precise matching to downstream LDO dropout requirements. |
Use Scenario: Powering audio DSP and display controller in 12V automotive infotainment head units with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck converter handling wide 4.75–28V input range including load-dump and start-stop transients. Use Value: Input UVLO (3.5–4.7V) with hysteresis and thermal shutdown (160°C) ensure reliable operation during engine cranking and high-ambient cabin conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2303DQ-LF | Same silicon, but in 3×3mm QFN-10 package with three GND pins and lower θJA (50°C/W) - no exposed pad required. | Better thermal performance in high-density layouts; preferred for space-constrained PCBs where SOIC footprint is prohibitive. | Select MP2303DQ-LF when board area is limited and thermal management relies on top-side convection or internal layers. |
| MP2315DJ-LF-Z | Higher 6A rating, 500kHz switching, smaller 8-pin SOT563 package; feedback reference remains 0.8V but RDS(ON) is 45mΩ/30mΩ. | Supports higher current loads and faster transient response; requires different compensation due to higher fSW and lower ESR sensitivity. | Choose MP2315DJ-LF-Z only when >3A output or <100ns minimum on-time is required; not drop-in compatible due to pinout and compensation changes. |
Compared with MP2303DN-LF, MP2303DQ-LF offers identical electrical specs in a smaller thermal package ideal for miniaturized designs, while MP2315DJ-LF delivers higher current and speed at the cost of revised layout, compensation, and footprint - making DN-LF optimal for cost-sensitive, thermally moderate 3A applications.
Availability
MP2303DN-LF is available at Aetrix Electronics and suitable for industrial distributed power, notebook computer core rails, pre-regulation for linear regulators, and automotive infotainment systems requiring stable component supply with RoHS-compliant packaging and extended temperature support.
Supply support for MP2303DN-LF 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 focus on DC/DC converters, LED drivers, and motor drivers for industrial, computing, and automotive markets.
The MP2303 belongs to MPS's mainstream synchronous buck regulator product line, designed for cost-effective, high-efficiency point-of-load conversion in space- and thermal-constrained applications where integration and reliability are critical.
FAQ
What is the recommended input capacitor configuration for MP2303DN-LF?
Use parallel ceramic capacitors: one 0.1μF X7R capacitor placed directly at the IN pin, plus ≥22μF total capacitance (e.g., two 10μF/35V X5R) nearby. RMS current rating must exceed half the max load current (≥1.5A), and low ESR (<10mΩ) is essential to minimize input ripple and prevent instability.
Can MP2303DN-LF operate with 3.3V output and 12V input without external bootstrap diode?
Yes - the internal bootstrap circuit sustains high-side gate drive at D ≈ 27.5% (3.3/12). An external Schottky diode (e.g., IN4148) is optional and only recommended if duty cycle exceeds 65% (e.g., 5V out from 7V in), where internal charge pump may be insufficient.
How is soft-start time calculated for MP2303DN-LF?
Soft-start time tSS = (CSS × 0.8V) / 6μA, where CSS is the capacitor value from SS to GND. For example, a 100nF capacitor yields tSS ≈ 13.3ms. Do not leave SS floating; use ≥100pF even if minimal ramp is desired to avoid noise-induced startup faults.
What is the minimum output capacitor ESR requirement for stability?
No minimum ESR is required - MP2303DN-LF is explicitly compensated for zero-ESR ceramic capacitors. Stability is maintained with X5R/X7R ceramics as low as 10μF; aluminum or tantalum caps require additional compensation (e.g., C6 = 50–300pF) per Table 3 in the datasheet.
Does MP2303DN-LF support forced PWM or PFM mode selection?
No - MP2303DN-LF operates exclusively in forced continuous conduction mode (CCM) at fixed 340kHz. It does not feature pulse-frequency modulation (PFM) or mode-select pins; light-load efficiency is managed via reduced switching losses from synchronous rectification, not frequency scaling.
What is the maximum allowable output voltage when using MP2303DN-LF?
The absolute maximum output voltage is limited by the 31V switch node rating and internal OVP threshold (0.9–1.0V on FB). With 0.8V feedback reference, maximum VOUT = 0.8V × (1 + R1/R2). Practical limit is 25V, as specified in the datasheet, constrained by external resistor voltage ratings and layout parasitics.
Is the exposed pad on MP2303DN-LF electrically connected to GND?
Yes - the exposed thermal pad is internally connected to GND (Pin 4). It must be soldered to a dedicated GND copper pour with multiple thermal vias to inner layers; failure to do so degrades thermal performance and may cause premature thermal shutdown under 3A load.
MP2303DN-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 25V
- Current - Output:
- 3A
- Frequency - Switching:
- 340kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP2303DN-LF FAQ
1.How can I place an order for MP2303DN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2303DN-LF 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 MP2303DN-LF reliable?
The price and inventory of MP2303DN-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2303DN-LF is usually 5 days.
3.What payment methods are accepted for MP2303DN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2303DN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2303DN-LF?
MP2303DN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2303DN-LF 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 MP2303DN-LF?
For technical support, including MP2303DN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2303DN-LF requirements.
6.How does Aetrix verify that MP2303DN-LF is sourced from the original manufacturer or authorized distributors?
All MP2303DN-LF 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 MP2303DN-LF meets industry standards.
7.What is the process for return or replacement of MP2303DN-LF?
All MP2303DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2303DN-LF, 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 MP2303DN-LF part is unused and in its original packaging.
Return procedure for MP2303DN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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