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Monolithic Power Systems Inc. MP2303DN-LF-Z
- Part No.:
- MP2303DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2303DN-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:2,464
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Product details
Overview
MP2303DN-LF-Z from Monolithic Power Systems is a monolithic synchronous buck regulator integrating high- and low-side N-channel MOSFETs, delivering 3A continuous output current across 4.75V–28V input range, with fixed 340kHz switching frequency, 0.8V feedback reference, and adjustable output from 0.8V to 25V - used in notebook computers and distributed power systems.
For engineers reviewing the MP2303DN-LF-Z datasheet, MP2303DN-LF-Z pinout, MP2303DN-LF-Z application, or MP2303DN-LF-Z equivalent, key selection criteria include input UVLO threshold (3.8V typ), soft-start programmability via SS pin, cycle-by-cycle overcurrent protection (6.3A typ), thermal shutdown at 160°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MP2303DN-LF-Z employs current-mode control with an internal transconductance error amplifier (GEA = 820 µA/V) and COMP pin-based loop compensation, enabling fast transient response and stable regulation across wide load and line variations. Its integrated power switches feature matched 125 mΩ RDS(ON) for both high- and low-side MOSFETs.
Functional block integration includes a 340kHz oscillator, 0.8V precision reference, enable comparator with 1.5V turn-on threshold and 220mV hysteresis, and bootstrap circuitry requiring external SW-to-BS capacitor for high-side gate drive - all operating within –40°C to +85°C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports mid-power embedded rails without external heatsinking under typical PCB layout. |
| Input Voltage Range | 4.75V to 28V - enables direct operation from 5V, 12V, or 24V industrial/bus supplies. |
| Feedback Reference | 0.800V ±2% - sets output accuracy; allows precise 1.2V, 1.8V, 3.3V, or 5V generation via resistor divider. |
| Switching Frequency | 340kHz fixed - balances EMI performance, inductor size, and efficiency for compact DC/DC designs. |
| Efficiency | Up to 95% - achieved with integrated MOSFETs and optimized gate drive, reducing conduction and switching losses. |
| Shutdown Current | 1μA max - minimizes system standby power in battery-backed or always-on applications. |
| Thermal Shutdown | 160°C junction - protects against sustained overload or poor thermal design without external sensing. |
Pinout & Package
MP2303DN-LF-Z uses the SOIC8E (exposed pad) package - thermally enhanced 8-pin surface-mount with exposed thermal pad on underside for improved heat dissipation in high-current operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 2) | Power Input | Accepts 4.75V–28V supply; requires local bulk + high-frequency ceramic bypassing to GND. |
| SW (Pin 3) | Switch Node | Connects to inductor and bootstrap capacitor; carries high di/dt switching current - critical for EMI and layout. |
| GND (Pin 4) | Ground Reference | Primary return path for power and signal; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. |
| FB (Pin 5) | Feedback Input | Senses regulated output via resistive divider; 0.8V reference enables accurate voltage setting with <±1% tolerance. |
| COMP (Pin 6) | Compensation Node | Output of internal error amplifier; connects to RC network for loop stability - determines transient response and phase margin. |
| EN (Pin 7) | Enable Control | Digital input: >2.7V enables regulator; <1.1V disables it; 220mV hysteresis prevents chatter near threshold. |
| SS (Pin 8) | Soft-Start Control | Connects to capacitor to linearly ramp output voltage; prevents inrush current and overshoot during startup. |
| BS (Pin 1) | Bootstrap Supply | Drives high-side MOSFET gate; requires ≥0.01µF ceramic cap between BS and SW to sustain gate voltage above IN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Switches | Matched 125 mΩ RDS(ON) high- and low-side N-MOSFETs eliminate external FETs and drivers, reducing BOM count and board area. |
| Programmable Soft-Start | Capacitor-controlled ramp on SS pin limits inrush current and avoids output overshoot - essential for powering sensitive logic rails. |
| Cycle-by-Cycle OCP | Internal current limit triggers per-switch cycle (6.3A typ), preventing MOSFET failure during short-circuit or overload events. |
| UVLO with Hysteresis | 3.8V rising / 3.5V falling threshold ensures clean start-up and shutdown without oscillation near brown-out conditions. |
| Stable with Ceramic Output Caps | No minimum ESR requirement - supports small, reliable X5R/X7R MLCCs instead of larger, less stable electrolytics. |
Applications
| Industrial Distributed Power | Notebook Computer Core Rail |
|---|---|
|
Use Scenario: Point-of-load conversion in programmable logic controllers (PLCs) where 24V bus supplies multiple isolated 3.3V/5V subsystems. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable 3.3V at up to 3A for FPGA I/O banks and microcontroller peripherals. Use Value: Integrated MOSFETs and 340kHz switching enable compact, low-noise design meeting IEC 61000-4-3 radiated immunity requirements. |
Use Scenario: Main 5V rail generation in ultrabook motherboards powered from 12V or 19V adapter inputs. IC Role / Device Role / Timing Role: Synchronous buck converter regulating 5V for USB controllers, display interface ICs, and SSD power management. Use Value: 95% peak efficiency and 1μA shutdown current extend battery runtime while maintaining thermal headroom in thin form factors. |
| Pre-Regulator for Linear Regulators | Automotive Infotainment Display Supply |
|
Use Scenario: Generating 3.3V intermediate rail feeding low-noise LDOs for RF transceivers and analog sensor interfaces. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing dropout and heat dissipation in downstream LDOs. Use Value: Fixed 340kHz frequency simplifies EMI filtering; 0.8V feedback reference enables precise tracking of LDO setpoints. |
Use Scenario: Powering LCD timing controllers and backlight drivers in automotive head units operating from 9V–16V battery input. IC Role / Device Role / Timing Role: Robust DC/DC converter with UVLO (3.8V) and thermal shutdown (160°C) meeting AEC-Q200 stress requirements. Use Value: Wide 4.75V–28V input range accommodates cold-crank (6.5V) and load-dump (28V) transients without external protection. |
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-Z | Same die, 3×3 mm QFN-10 package with three GND pins and exposed thermal pad - lower θJA (50°C/W vs. SOIC8E's 50°C/W, but better θJC). | Preferred for space-constrained, thermally demanding layouts where top-side cooling is limited. | Select when PCB real estate or thermal performance outweighs SOIC hand-soldering convenience. |
| TPS54302DDCR | TI part: 3A, 3.5–28V input, 570kHz switching, 0.8V ref, but no integrated low-side FET - requires external sync rectifier or diode. | Higher switching frequency enables smaller inductors but increases EMI filtering complexity and reduces efficiency at light loads. | Choose only if higher frequency or TI ecosystem support (WEBENCH, PSPICE models) is required - not drop-in compatible. |
Compared with MP2303DN-LF-Z, the MP2303DQ-LF-Z offers identical electrical specs in a thermally superior QFN package, while the TPS54302DDCR trades integration for frequency flexibility and vendor toolchain access - neither matches the SOIC8E's balance of manufacturability, thermal adequacy, and full integration.
Availability
MP2303DN-LF-Z is available at Aetrix Electronics and suitable for industrial distributed power systems, notebook computer core rails, pre-regulator stages for linear regulators, and automotive infotainment displays requiring stable component supply and long-term production continuity.
Supply support for MP2303DN-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, headquartered in California and serving global industrial, computing, and automotive markets since 1997.
The MP2303 belongs to MPS's mainstream synchronous buck regulator product line, designed for cost-sensitive, space-constrained applications requiring high integration, robust protection, and simplified layout - especially in consumer and industrial power supplies.
FAQ
What is the maximum recommended output voltage for MP2303DN-LF-Z?
The MP2303DN-LF-Z supports output voltages up to 25V, determined by its internal error amplifier headroom and FB pin voltage range. This is achieved using a resistive divider where R1 and R2 scale VOUT down to the 0.8V reference. For outputs above 12V, ensure the EN and SS pins remain within their absolute maximum ratings (≤6V), and verify that the external bootstrap capacitor maintains sufficient voltage margin across the full input-output differential.
Can MP2303DN-LF-Z operate with a 3.3V input supply?
No - MP2303DN-LF-Z has a minimum input voltage of 4.75V per its Absolute Maximum Ratings and Recommended Operating Conditions. Attempting operation below this threshold will trigger UVLO and prevent regulation. For 3.3V input applications, consider MPS's MP2143 (3.3V–17V input) or MP2152 (2.5V–6V input) families, which are specifically designed for low-input-voltage buck conversion.
Is an external Schottky diode required for MP2303DN-LF-Z?
No - MP2303DN-LF-Z integrates both high- and low-side N-channel MOSFETs for synchronous rectification, eliminating the need for an external catch diode. However, an optional Schottky diode (e.g., B130 or SK13) may be added in parallel with the SW-to-GND path to improve efficiency at very light loads (<100mA) where body diode conduction dominates, though this is rarely necessary in typical 3A applications.
How is thermal performance affected by the SOIC8E exposed pad?
The SOIC8E package's exposed thermal pad must be soldered to a dedicated PCB copper pour connected to GND for effective heat transfer. With proper 2-layer or 4-layer board layout (≥2 cm² pad area, 4+ thermal vias), θJA drops from 100°C/W (no pad) to ~50°C/W, allowing full 3A operation at +85°C ambient. Failure to connect the pad results in rapid thermal shutdown under load due to junction temperature exceeding 160°C.
What happens if the SS pin is left floating?
Leaving the SS pin unconnected violates the datasheet recommendation and risks erratic startup behavior, including output overshoot or failure to regulate. The SS pin has internal biasing but is highly noise-sensitive; floating operation may cause uncontrolled soft-start timing or false triggering of internal comparators. Always connect a capacitor (e.g., 10nF–100nF) from SS to GND - even 1nF provides basic noise immunity if soft-start duration is not critical.
Does MP2303DN-LF-Z support forced PWM or pulse-skipping modes?
No - MP2303DN-LF-Z operates exclusively in forced continuous conduction mode (CCM) at fixed 340kHz. It does not include pulse-skipping, burst-mode, or discontinuous conduction mode (DCM) features. This ensures constant switching frequency for predictable EMI filtering but results in reduced light-load efficiency compared to adaptive-mode regulators. For variable-frequency or high-light-load-efficiency needs, consider MPS's MP2315 or MP2451 families.
How is the upper-switch current limit calibrated?
The upper-switch current limit is factory-trimmed and specified as 4.3–8.3A (typ 6.3A) across temperature, based on internal current-sense amplifier gain and comparator thresholds. It is not user-adjustable. The limit activates on a cycle-by-cycle basis when sensed switch current exceeds the threshold, immediately terminating the high-side on-time - protecting against short circuits and inductor saturation without requiring external sensing components.
MP2303DN-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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-Z FAQ
1.How can I place an order for MP2303DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2303DN-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 MP2303DN-LF-Z reliable?
The price and inventory of MP2303DN-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 MP2303DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2303DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2303DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2303DN-LF-Z?
MP2303DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2303DN-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 MP2303DN-LF-Z?
For technical support, including MP2303DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2303DN-LF-Z requirements.
6.How does Aetrix verify that MP2303DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2303DN-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 MP2303DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2303DN-LF-Z?
All MP2303DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2303DN-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 MP2303DN-LF-Z part is unused and in its original packaging.
Return procedure for MP2303DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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