產品應用：

LD7120 - Single Synchronous Buck PWM Controller

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

Typical Application