AT1793

AT1793 Preliminary Product Information 2-Channel Step-Down PWM Controller Features 4.75V to 26V supply voltage operating. Efficiency up to 85%. Typical frequency operation to 1MHz. Voltage-mode PWM step-down regulation. 1V±2% internal reference. Shutdown current less than 30uA. Soft-start built-in. Short-circuit protection build-in QFN-16 & SOP-14 package. Applications DC-DC power management. General Description AT1793 is a voltage-mode PWM step-down controller capable of driving loads over a wide input supply range with excellent line and load regulation characteristics. High efficiency is obtained through the use of a low Rds(on) P-channel power switch. It uses a fixed switching frequency up to 1MHz thus allowing smaller sized components. The output voltage level is user-programmable via an external resistive voltage divider. The built-in soft-start can reduce inrush current on the input source at turn on. The built-in short-circuit protection can prevent from a short-circuit. The AT1793 also has built-in 2 control pins that can power down the regulator to a shutdown mode. In shutdown mode the regulator draws less than 30uA of supply current AT1793 is available in QFN-16 or SOP-14 package. Block Diagram Aimtron reserves the right without notice to change this circuitry and specifications. 7F, NO.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/...