General Description
The SY20118A high-efficiency 1MHz synchronous
step-down DC/DC regulator operates over a wide
input voltage range of 2.5V to 5.5V, and can deliver
an output current up to 4A with a low quiescent
current of 55μA. It integrates a main switch and a
synchronous switch with very low RDS(ON) to
minimize conduction loss. The 1MHz switching
frequency allows for low output-voltage ripple, as
well as small external inductor and capacitor values.
The SY20118A is highly integrated, so only the
input and output capacitors, inductor, and feedback
resistors need to be selected for the targeted
application specifications.
The SY20118A is available in a compact DFN2×2-
8 package.

Features
● 2.5V to 5.5V Input Voltage Range
● Up to 4A Output Current
● Low RDS(ON) for Internal Switches: 85mΩ
Top, 60mΩ Bottom
● Low 55μA Quiescent Current
● High 1MHz Switching Frequency Minimizes
Required External Components
● Internal Soft-Start Limits the Inrush Current
● 100% Dropout Operation
● Power-Good Indicator
● Hiccup Mode for Short-Circuit Protection
● Output Auto-Discharge Function
● RoHS-Compliant and Halogen-Free
● Compact Package: DFN2X2-8

Applications
● Set-Top Box
● USB Dongle
● Media Player
● Smartphone