RT9205A Datasheet | Richiek

Description The RT9205/A is a dual-output power controllers designed for high performance graphics cards and personal puters. 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 pensated 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 300k Hz oscillation frequency reduces the ponent size for saving board area. The RT9205/A also features over voltage protection (OVP) and under voltage lock-out (UVLO). Features Operates at 5V 0.8V Internal Reference Drives Two N-channel MOSFET Voltage Mode PWM Control Fast Transient Response Fixed 300k Hz Oscillator Frequency Dynamic 0~100% Duty Cycle Internal PWM Loop pensation Internal Soft-Start Adaptive Non-overlapping Gate Driver Over-voltage Protection Uses Lower MOSFET Pin Configurations Part Number RT9205/ACS (Plastic SOP-14) Pin Configurations TOP VIEW LGATE 1 PGND 2 GND 3 VCC 4 DRV 5 FBL 6 NC 7 14 13 12 11 10 9 8 Applications PC Motherboard Cable Modems, Set-Top-Box, and XDSL Modems DSP and Core munications Processor Supplies Memory Power Supplies Personal puter Peripherals Industrial Power Supplies 5V Input DC-DC Regulators Low Voltage Distributed Power Supplies Graphic Cards UGATE BOOT NC NC NC FB NC Ordering Information RT9205/A Package Type S : SOP-14 Operating Temperature Range C : mercial Standard UVP : Hiccup Mode UVP : Latch Mode DS9205/A-03 May 2003 .richtek. 5V 5V L1 1µ H Be Careful during La you t pha se C1 1µ F .richtek. 4 VCC 5 DRV UGATE 0.8V D1 1N5819 RT9205/A Typical Application Circuit 5V + CE1 100 µF Q1 2SD180 2 BOOT 14 G1 S2 G2 R3 200 R4 200 C7 10n F VOUT1 = 0.8V- (1+R3/R4) 13 2 D1 D2 D2 5 pha se C3 0.1µF 1 S1 7 6 C2 1µ F PHKD6N02LT D1 + R1 390 CE2 680 µF L2 5µ H VOUT1...