SY20122A1ABC

High Efficiency, 1.5MHz, 5.5V, 2A Synchronous Buck Regulator

SY20122A1ABC High Efficiency, 1.5MHz, 5.5V, 2A Synchronous Buck Regulator Datasheet

Parameters
Features
Description

Part Number	SY20122A1ABC
Vin_min (V)	2.5
Vin_max (V)	5.5
Io_max (A)	2
Channels
Vo_min (V)	0.6
Fsw (MHz)	1.5
Vref (V)
Vref Accuracy	±1.5%
Iq (uA)	50
Rdson1	130
Rdson2	85
Soft Start	1
Package	SOT23-6
Topology
Protection Mode	Hic-cup SCP
Features / Special Function	Power Good Indicator,Auto-Discharge,100% Dropout Operation
Temp Range

Low RDS(ON) for Internal Switches: 130mΩ Top, 85mΩ Bottom
2.5V ~ 5.5V Input Voltage Range
Up to 2A Output Current
50µA Low Quiescent Current
1.5MHz High Switching Frequency Minimizes Required External Components
Constant Off-Time and Peak Current Mode Control
Internal Soft-Start Limits Inrush Current
100% Dropout Operation
Power-Good Indicator
Hiccup Mode for Short-Circuit Protection
Output Auto-Discharge Function
Input Under Voltage Lockout (UVLO)
RoHS-Compliant and Halogen-Free
Compact SOT23-6 Package

The SY20122A1 high efficiency and low quiescent current synchronous Buck regulator operates over a wide input voltage range of 2.5V to 5.5V, and can deliver an output current up to 2A. It integrates a top FET and a bottom FET with very low R_DS(ON)to minimize conduction loss. The 1.5MHz pseudo-constant switching frequency enables using small external inductor and capacitor values.

The SY20122A1 employs constant off-time and peak current mode control strategy to achieve fast transient response and high efficiency at light loads. It also provides cycle-by-cycle current limiting and over temperature protection.

The SY20122A1 is highly integrated, so only the input and output capacitors, inductor, and feedback network components need to be selected for the targeted application specifications.

The SY20122A1 is available in a space-saving, low-profile SOT23-6 package.