MP2403
NOT RECOMMENDED FOR NEW DESIGNS
4.6V to 32V, 250kHz, 3A Sync Buck with External , Comp and External SS
MP2403 continues to be in production for existing customers. Please consider this alternative for new designs:

MP9943GQ-Z
MP9943GQ-Z
High Efficiency 3A Peak, 36V, Synchronous Step Down Converter with Power Good
Features & Benefits
- Wide 4V to 36V Continuous Operating Input Range
- 85mO/55mO Low RDS(ON) Internal Power MOSFETs
- High-Efficiency Synchronous Mode Operation
- 410kHz Switching Frequency
- Synchronizes from 200kHz to 2.2MHz External Clock
- High Duty Cycle for Automotive Cold-crank
- Internal Power-Save Mode
- Internal Soft-Start
- Power Good Indicator
- Over Current Protection and Hiccup
- Thermal Shutdown
- Output Adjustable from 0.8V
- Available in an QFN-8 (3mmx3mm) package
… and many more!
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Description
The MP2403 is a monolithic synchronous buck regulator. The device integrates a 150mΩ high side MOSFET and a 80mΩ low side MOSFET that provide 3A continuous load current over a wide operating input voltage of 4.6V to 32V. Current mode control provides fast transient response and cycle-by-cycle current limit. An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops to 1μA. This device, available in an 8-pin SOIC package, provides a very compact system solution with minimal reliance on external components.
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Features & Benefits
- 3A Output Current
- Wide 4.6V to 32V Operating Input Range
- Integrated MOSFET Switches
- Output Adjustable from 0.80V to 28V
- Up to 95% Efficiency
- Programmable Soft-Start
- Stable with Low ESR Ceramic Output Capacitors
- Fixed 250kHz Frequency
- Cycle-by-Cycle Over Current Protection
- Input Under Voltage Lockout
- Thermally Enhanced 8-Pin SOIC Package

Active Part Numbers:
MP2403DN-LF-P MP2403DN-LF-Z
Part numbers ending in P and Z are the same parts. P and Z only indicates reel size.
Meaning of P & Z
MP2403 Resources
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PLANNING FOR SUDDEN POWER FAILURES WITH THE MP5515ARTICLEPower failures tend to cause a domino effect of disruptions, resulting in system failures and data loss, as well as damage to servers and equipment. This article describes how to use the MP5515 to protect solid-state drives (SSDs) against sudden power failure. There are three main issues if an SSD experiences a power failure: The MP5515 is an input power conditioning PMIC that provides a compact...
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EVALUATING THE TRANSIENT PERFORMANCE OF BUCK REGULATORS WITH AN INTEGRATED COMPENSATION NETWORKARTICLEDesigning the compensation network for buck regulators can be tedious and may require several iterations to optimize the solution. Having an optimized control loop, which can enable fast transient response while maintaining proper stability, has become a major challenge with the emergence of new applications such as ADAS and fast transient response requirements. To address these issues, buck regul...
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MP4581 & MP4541: SYNCHRONOUS, HIGH-VOLTAGE BUCK CONVERTERSVIDEOThe MP4581 and MP4541 support a 100V and 80V maximum input voltage, respectively, with up to 0.8A of output current in a compact SOIC-8EP package. Up to 94% peak efficiency Fewer external components required makes layout easier Integrated high-side and low-side FETs 15μA quiescent current Supports satellite video, e-bike GPS tracking, industrial power supplies, industrial gateways, printer ...
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MP5470: UNBOXING AND GETTING STARTEDVIDEOOur engineers walk you through unboxing and getting started with the evaluation kit for the MP5470, a power management IC with four buck converters and configurable settings. The EV5470-L-00A evaluation board provides the ability to test and configure the 4V to 16V PMIC for your application.
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SWITCH NODE LAYOUT CONSIDERATIONS FOR EMCARTICLEThe switch node of a switching regulator or power converter circuit is a critical conduction path that requires special attention when designing the PCB layout. This circuit node is where one or more power semiconductor switches (such as a MOSFET or diode) connect to a magnetic energy-storing device (such as an inductor or transformer winding). The switching signals of this circuit node contain fa...
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ARTICLE
UNDERSTANDING DATASHEET THERMAL PARAMETERS AND IC JUNCTION TEMPERATURESARTICLEThere is much confusion regarding how to make meaningful design decisions when converting a datasheet’s thermal resistance parameters. This introductory article will help today’s hardware engineers understand how to decipher the thermal parameters found in datasheets — including whether to choose theta vs. psi, how to calculate these values, and most importantly, how to apply the...
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ARTICLE
QUICK TIPS TO DIAGNOSE AND STABILIZE AN UNSTABLE SWITCHING POWER SUPPLYARTICLEAn unstable power supply can cause severe system issues, such as audible noise from the passive components, unexpected jittering in the switching frequency, extreme oscillations on the output voltage during load transient events, and failures in the semiconductor switches. While there are various reasons for instability, an un-tuned compensation network accounts for majority of instability issues ...
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ARTICLE
USING EXTERNAL KNOBS TO IMPROVE TRANSIENT PERFORMANCE OF BUCK REGULATORS WITH AN INTEGRATED COMPENSATION NETWORKARTICLEThe high power density requirement and board-level space constraints in modern applications — such as lighting, ADAS, and USB — call for higher integration in buck regulators. There is a trend to integrate MOSFETs and compensation networks inside the chip. This integration of the compensation network’s passive components saves cost, board space, and design iterations. However, it...
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VIDEO
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AUTOMOTIVE WIRELESS POWER SOLUTIONS FOR 15W QI STANDARDVIDEOLearn about front-end performance for wireless power. See the advantages of the MPQ4280 and how it compares with competitors.
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