# USR1021 3A Synchronous Buck Regulator

## Description
️· High efficiency, 3A synchronous buck regulator
️· Input Voltage: 6V to 18V
️· Output Current: Up to 3A continuous
️· Adjustable Output Voltage: Down to 0.8V
️· Operating Temperature: -40°C to +85°C
️· Package: SOP-8

## Features
️· 6V~18V operating input voltage range
️· Internal soft start
️· 1.5% initial output accuracy
️· 3A continuous output current
️· Cycle-by-cycle current limit
️· 500kHz PWM operation
️· Thermal shutdown
️· Short-circuit protection

## Pin Configuration
️· PIN 1: PGND (Power Ground)
️· PIN 2: VIN (Supply Voltage Input)
️· PIN 3: AGND (Reference Ground)
️· PIN 4: FB (Feedback Voltage)
️· PIN 5: COMP (Compensation Pin)
️· PIN 6: EN (Enable Pin)
️· PIN 7, 8: LX (Switch Pin)

## Absolute Maximum Ratings
️· Supply Voltage (VIN): 18V
️· Junction Temperature (TJ): +150°C
️· Storage Temperature (TSTG): -65°C to +150°C

## Electrical Characteristics (TA=25°C, VIN=VEN=12V, VOUT=3.3V)
️· Quiescent Current (IIN): 3.5mA (Typ)
️· Shutdown Current (IOFF): 1µA (Typ)
️· Feedback Voltage (VFB): 0.8V (Typ)
️· PWM Frequency (fO): 500kHz (Typ)
️· Current Limit (ILIMT): 4.5A (Typ)

## Ordering Information
️· USR1021L-S08-R: SOP-8, Tape Reel
️· USR1021L-S08-T: SOP-8, Tube
️· USR1021G-S08-R: SOP-8, Tape Reel (Halogen Free)
️· USR1021G-S08-T: SOP-8, Tube (Halogen Free)

## Typical Application Circuit
️· Includes input and output capacitors (22µF ceramic) and inductor (L1 4.7µH).