General Description
The SY8089 and SY8089A are high-efficiency, high
frequency synchronous step-down DC-DC regulator IC
capable of delivering up to 2A output current. The
SY8089 and SY8089A operate 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.
SY8089 integrates short circuit and over-voltage latch
off protection.

Features
· Low RDS(ON) for internal switches
(top/bottom):110mΩ/80mΩ
· 2.7-5.5V input voltage range
· 2A continuous, 3A peak load current capability
· 1MHz switching frequency minimizes the external
components
· Internal softstart limits the inrush current
· Reliable short circuit protection:

SY8089: Latch off protection

SY8089A: Hic-cup mode protection
· Reliable over-voltage protection:

SY8089: Latch off protection

SY8089A: No latch off protection
· 100% dropout operation
· RoHS Compliant and Halogen Free
· Compact package: SOT23-5

Applications
· LCD TV
· Set Top Box
· Net PC
· Mini-Notebook PC
· Access Point Router