SY20149AAAC - High Efficiency, 1.5MHz, 2A Buck


·       Low RDS(ON) for Internal Switches


·       2.7-5.5V Input Voltage Range

·       2AContinuous,3APeak Lload Current Capability

·       1MHz Switching Frequency Minimizes the External Components

·        Internal Softstart Limits the Inrush Current

·        Reliable Short Circuit Protection:

SY20149A: Hic-cup Mode Protection

·        Reliable Over-voltage Protection:

SY20149A:  No Latch off Protection

·        100% Dropout Operation

·        RoHS Compliant and Halogen Free

·        Compact Package: SOT23-5

Typical Application


The SY20149A is a high-efficiency, high frequency synchronous step-down DC-DC regulator IC capable of delivering up to2Aoutput current. The SY20149A operates over a wide input voltage range from 2.7V to 5.5V and integrate main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.

Low output voltage ripple and small external inductor and capacitor sizes are achieved with greater than 1MHz switching frequency.

SY20149 integrates short circuit and over-voltage latch off protection.


·       LCD TV

·       Set Top Box

·       Net PC

·       Mini-Notebook PC

·       Access Point Router