L6725A STMicroelectronics

L6725 L6725A Voltage mode PWM controller with bootstrap anti-discharging system Features Input voltage range from 1.8V to 18V Supply voltage range from 4.5V to 18V Adjustable output voltage down to 0.6V with 0.8% accuracy over line voltage and temperature (0C~125C) Fixed frequency voltage mode control 0% to 100% duty cycle External input voltage reference SO16N (Narrow) Soft-start and inhibit Bootstrap anti-discharging system High current embedded drivers Predictive anti-cross conduction control Applications Programmable high-side and low-side R DS(on) sense over-current-protection Low voltage distributed DC-DC Sink current capability Graphic cards Selectable switching frequency 250KHz/ 500KHz Power good and synch available with L6725A Pre-bias start up capability Over voltage protection Thermal shut-down Package: SO16N Table 1. Device summary Order codes Package Packing L6725 SO16N Tube L6725TR SO16N Tape & Reel L6725A SO16N Tube L6725ATR SO16N Tape & Reel June 2007 Rev 5 1/32 www.st.com 32Contents L6725 - L6725A Contents 1 Summary description 4 1.1 Functional description . 4 2 Electrical data 5 2.1 Maximum rating . 5 2.2 Thermal data 5 3 Pin connections and functions 6 4 Electrical characteristics . 8 5 Device description 10 5.1 Oscillator 10 5.2 Internal LDO . 10 5.3 Bypassing the LDO to avoid the voltage drop with low Vcc . 11 5.4 Internal and external references 11 5.5 Error amplifier 12 5.6 Soft start 12 5.7 Driver section 14 5.8 Monitoring and protections 14 5.9 Hiccup mode . 15 5.10 Thermal shutdown 15 2/32