# USR1101 Synchronous Buck PWM DC-DC Controller

## Description
· High efficiency synchronous buck PWM controller
· Fixed 300kHz frequency operation
· Internal soft-start and frequency compensation
· Integrates control, output adjustment, monitoring & protection
· Adjustable over-current protection (OCP) monitors MOSFET voltage drop

## Features
· Operating Voltages: 5V or 12V
· Drives low-cost N-channel MOSFETs
· PWM control mode
· Internal soft-start
· OCP monitors MOSFET - no current sense resistor needed
· RoHS compliant, 100% lead (Pb)-free
· Package: SOP-8

## Pin Configuration
· BOOT: High-Side gate drive boost
· UGATE: Upper gate driver output
· GND: Ground
· LGATE: Lower gate drive output
· VCC: Supply voltage
· FB: Feedback voltage
· OPS: Over-current setting and shutdown
· NC: No bonding

## Absolute Maximum Ratings
· Supply Voltage (VCC): 16V
· Power Dissipation (TA=25°C): 0.625W
· Storage Temperature: -65~150°C
· Junction Temperature: 150°C

## Recommended Operating Conditions
· Supply Voltage (VCC): 5±5%, 12±10% V
· Ambient Temperature: 0~70°C
· Junction Temperature: 0~125°C

## Electrical Characteristics (VCC=5V/12V, TA=25°C)
· ICC (Nominal Supply Current): 6-15mA
· POR Threshold: 4.1-4.5V
· Reference Voltage (VREF): 0.784-0.816V (VCC=12V)
· Oscillator Frequency: 250-350kHz (VCC=12V)
· Dead Time: 100ns
· FB Under-Voltage Trip: 70-80%
· OC Current Source: 40-45µA
· Soft-Start Interval: 2.5ms

## Application Information
· OCP: Uses Rds(on) of lower MOSFET to set overcurrent trip point. IOCSET = 40μA × ROCSET − 0.4V / R DS(ON)
· Shutdown: Pulling OPS pin low shuts down the controller.

## Ordering Information
· USR1101L-S08-R: SOP-8, Tape Reel, Lead Free
· USR1101G-S08-R: SOP-8, Tape Reel, Halogen Free
· USR1101L-S08-T: SOP-8, Tube, Lead Free
· USR1101G-S08-T: SOP-8, Tube, Halogen Free