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