RT9205APS

Preliminary RT9205/A Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller General Description The RT9205/A is a dual-output power controllers designed for high performance graphics cards and personal computers. The IC integrates a synchronous buck controller, a linear controller and protection functions into a small 14-pin package. The RT9205/A uses an internal compensated voltage mode PWM control for simplying design. An internal 0.8V reference allows the output voltage to be precisely regulated to meet low output voltage requirement. A fixed 300kHz oscillation frequency reduces the component size for saving board area. The RT9205/A also features over voltage protection (OVP) and under voltage lock-out (UVLO). Features l l l l l l l l l l l l Operates at 5V 0.8V Internal Reference Drives Two N-MOSFET Voltage Mode PWM Control Fast Transient Response Fixed 300kHz Oscillator Frequency Dynamic 0 to 100% Duty Cycle Internal PWM Loop Compensation Internal Soft-Start Adaptive Non-Overlapping Gate Driver Over-Voltage Protection Uses Lower MOSFET RoHS Compliant and 100% Lead (Pb)-Free Applications l l l Ordering Information RT9205/A Package Type S : SOP-14 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) UVP : Hiccup Node UVP : Latch Mode Note : RichTek Pb-free and Green products are : }RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. }Suitable for use in SnPb or Pb-free soldering processes. }100%matte tin (Sn) plating. l l l l l l PC Motherboard Cable Modems, Set-Top-Box, and XDSL Modems DSP and Core Communications Processor Supplies Memory Power Supplies Personal Computer Peripherals Industrial Power Supplies 5V Input DC-DC Regulators Low Voltage Distributed Power Supplies Graphic Cards Pin Configurations (TOP VIEW) LGATE PGND GND VCC DRV FBL NC 14 13 12 11 10 9 8 UGATE BOOT NC NC NC FB NC 2 3 4 5 6 7 SOP-14 DS9205/A-08 March 2007 www.richtek.com 1 www.richtek.com 2 RT9205/A Typical Application Circuit 5V 1uH 1uF 1N5819 4 5 DRV UGATE 0.8V 6 FBL 9 1uF FB RT9205/A PGND GND 2 200 200 10nF 120 R2