IRU3033 Datasheet | International Rectifier

( Data Sheet : .. ) Data Sheet No. PD94147 8-PIN PWM SWITCHER AND LINEAR CONTROLLER IC Features DESCRIPTION LDO Controller allows the use of a low cost pass transistor for the I/O supply 8-Pin SOIC bines switching and linear controller Internal pre-regulator eliminates cross talk between switching and linear regulators Automatic shut down of the linear regulator when connected to the Vcc2 detect pin On-Board MOSFET Driver Fastest transient response of any controller method (0 to 100% Duty Cycle in 100ns) 1% Internal Voltage Reference Internal Under-Voltage Lockout protects MOSFET during start-up The IRU3033 IC bines a switching controller and a linear regulator controller all in a pact 8-pin surface mount package, providing a total solution for dual supply processor applications such as an Intel P55C™ , AMD K6™ , as well as Cyrix 6X86L™ and the M2™ processors. Typically in these applications a dual supply regulator converts 5V to 3.3V for I/O supply and a jumper programmable supply of 1.25V to 3.5V for Core supply. The linear regulator controller portion in the IRU3033 is a programmable controller allowing flexibility for the I/O regulator and has a minimum of 50m A drive current capability designed to provide ample current for an external pass transistor. The IC uses an internal regulator generated from the 12V supply to power the controller as well as the 12V supply to drive the power MOSFET, allowing a low cost N-channel MOSFET switch to be used. The IC also includes an error parator 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 Dual supply low voltage processor applications, such as: P55C™ , CYRIX M2™ , POWER PC™ and AMD K6™ Simple 5V to 3.3V switcher for Pentium with AGP or Pentium II™ applications TYPICAL APPLICATION 5V C1 R9 C8 V12 Drv1 Drv2 VFB2 R8 Gnd D2 R7 Q1 R10 R6 C6 5V I/O 12V Vcc2...