US3036

US3036 8 PIN PWM SWITCHER CONTROLLER IC FEATURES 8 pin SOIC Switching Controller with HICCUP Current Limiting Reduces Diode Power Dissipation to Less than 1% of Normal Operation Soft Start Capacitor allows for smooth Output Voltage ramp up On board MOSFET driver Fastest transient response of any controller method. ( 0 to 100% Duty Cycle in 100 nS ) 1% internal voltage reference Internal Under Voltage Lockout protects MOSFET during start-up PRELIMINARY DATASHEET DESCRIPTION The US3036 IC provides an 8 pin low cost switching controller with true short circuit protection all in a compact 8 pin surface mount package, providing a low cost switching solution for applications that require a simple switching regulator from the 5V input where there is no other supply available. One type of such application is generating 2.5V standby from the dual 5V(5V and 5V standby) for the next generation processors. The IC starts below 4.5V supply and drives an external Pch MOSFET or and external low cost PNP as the switching element. The IC also includes an error comparator for fast transient response, a precise voltage reference for setting the output voltage as well as a direct drive of the MOSFET for the minimum part count. APPLICATIONS Single input Switching Regulators such as Simple 5V to 2.5V switcher for RDRAM regulator TYPICAL APPLICATION C8 8 7 6 5 SS CS+ CS- Gnd US3036 Drv Vcc Vfb NC 1 2 3 4 C3 R1 R3 C5 R6 C6 R7 L2 ATX P.S. 5V 5V(S.B.) Vout L1 Q2 C1 C2 C4 R2 D1 R5 3036app2-1....