General Description
The LD7120 is a single PWM controller designed to drive
N-channel MOSFET in a synchronous buck topology. The IC
integrates the controller, output adjustment, monitoring, and
protection functions in a single 8-pin package.

The LD7120 provides simple, single feedback loop, voltage
mode controller with fast transient response. Internal 0.8V
temperature-compensated reference voltage is designed to
meet low output voltage for further applications. A fixed
300KHz frequency oscillator reduces design complexity,
while balancing typical application cost and efficiency.
The LD7120 features over current protection. The output
current is monitored by sensing the voltage drop across the
MOSFET RDS(ON), which eliminates the need for a current
sensing resistor.

Features
• Operates from 5V
• Drives Two N-channel MOSFETs
• Fixed 300KHz Constant Switching Frequency
• Full 0~100% Duty-cycle
• Programmable Over Current Protection
• Internal Soft-start
• Fast Transient Response
• Under-voltage Lockout

Applications
• Motherboard
• Graphic Cards
• 5V Input DC/DC Converter
• Memory Supplies
• Cable Modem, Set Top Box and DSL Modems
• DSP and Core Communications Processor Supplies