21V, 3A, 500kHz Synchronous Step-down Converter

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The MP28253 is a high frequency synchronous rectified step-down switch mode converter with built in internal power MOSFETs. It offers a very compact solution to achieve 3A continuous output current over a wide input supply range with excellent load and line regulation. The MP28253 operates at high efficiency over a wide output current load range. Current mode operation provides fast transient response and eases loop stabilization. Full protection features include OCP and thermal shut down. The MP28253 requires a minimum number of readily available standard external components and is available in a space saving 3x4mm 14-pin QFN package.
产品特性
- Wide 4.5V to 21V Operating Input Range
- 3A Output Current
- Low RDS(ON) Internal Power MOSFETs
- Proprietary Switching Loss Reduction Technique
- Fixed 500kHz Switching Frequency
- External Soft-Start
- Sync from 300kHz to 2MHz External Clock
- Internal Compensation
- Integrated Bootstrap Diode
- Over-Current Protection and Hiccup
- Thermal Shutdown
- Output Adjustable from 0.8V
- Available in 14-Pin QFN 3x4mm Package
技术参数
- fsw (max) (kHz)500
- Vin (min) (V)4.5
- Vin (max) (V)21
- Iout (max) (A)3
- Isw Limit (typ) (A)5.6
- Max Duty Cycle (%)0.9
- Vfb (typ) (V)0.805
- Iq (typ) (mA)0.7
- Regulated Outputs1
- Vout (min) (V)0.8
- GradeCatalog
- PackageQFN-14 (3x4)
- Common FeaturesExternal Soft Start, Power Good, Synchronous Rectification
- Special FeaturesExternal Frequency Sync
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