MP28251
High Efficiency, 20V, 4A Synchronous Step-Down Converter with Low Rds on, SS and Low Power Mode
Product Description
The MP28251 is a synchronous, rectified, step-down, switch-mode converter with internal power MOSFETs. It offers a very compact solution to achieve a 4A continuous output current over a wide input supply range with excellent load and line regulation. The MP28251 has synchronous mode operation for higher efficiency over the output current load range. Current-mode operation provides a fast transient response and eases loop stabilization. Full protection features include over-current protection and thermal shutdown. The MP28251 requires a minimal number of readily-available standard external components and is available in a space saving 2mm×3mm 14-pin QFN package.
Product Features
- Wide 4.75V-to-20V Operating Input Range
- 4A Output Current
- Low RDS(ON) Internal Power MOSFETs
- Programmable Switching Frequency
- Programmable EN Delay
- Frequency SYNC from 300kHz to 2MHz External Clock
- Low Power Mode Selectable by an External Signal
- External Soft Start
- OCP and Thermal Shutdown
- Available in a 14-pin QFN2×3 Package
Parametrics
- fsw (max) (kHz)2000
- Vin (min) (V)4.75
- Vin (max) (V)20
- Iout (max) (A)4
- Isw Limit (typ) (A)5.6
- Max Duty Cycle (%)0.95
- Vfb (typ) (V)0.815
- Iq (typ) (mA)1
- Regulated Outputs1
- Vout (max) (V)17
- Vout (min) (V)0.8
- GradeCatalog
- PackageQFN-14 (2x3)
- Control ModeCurrent Mode
- Common FeaturesExternal Soft Start, Light-Load Efficiency, Synchronous Rectification
- Special FeaturesExternal Frequency Sync, Programmable Frequency
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