# USR1021 3A Synchronous Buck Regulator

## Description
️· High efficiency, 3A synchronous buck regulator.
️· Input voltage range: 6V to 18V.
️· Output voltage adjustable down to 0.8V.
️· Operates at -40°C to +85°C.
️· Packaged in SOP-8.

## Features
️· 6V-18V Operating Input Voltage
️· High Efficiency
️· Internal Soft Start
️· 1.5% Initial Output Accuracy
️· Adjustable Output Voltage (down to 0.8V)
️· 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 connection for controller
️· 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 (Typical, TA=25°C, VIN=12V, VOUT=3.3V)
️· Supply Voltage: 6V - 18V
️· Quiescent Current: 3.5mA - 5mA
️· Shutdown Current: 1µA - 10µA
️· Feedback Voltage: 0.788V - 0.812V
️· Load Regulation: 0.5%
️· Line Regulation: 1%
️· PWM Frequency: 400kHz - 600kHz
️· Current Limit: 3.5A - 4.5A
️· Thermal Shutdown (Rising TJ): 150°C
️· Thermal Shutdown (Falling TJ): 100°C

## 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)