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RT9205A

Richiek
Part Number RT9205A
Manufacturer Richiek
Description Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller
Published Feb 7, 2007
Detailed Description www.DataSheet4U.com Preliminary RT9205/A Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller General D...
Datasheet PDF File RT9205A PDF File

RT9205A
RT9205A

Overview
www.
DataSheet4U.
com 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 Operates at 5V 0.
8V Internal Reference Drives Two N-channel MOSFET Voltage Mode PWM Control Fast Transient Response Fixed 300kHz Oscillator Frequency Dynamic 0~100% Duty Cycle Internal PWM Loop Compensation 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 Communications Processor Supplies Memory Power Supplies Personal Computer 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 : Commercial Standard UVP : Hiccup Mode UVP : Latch Mode DS9205/A-03 May 2003 www.
richtek.
com 1 2 5V 5V L1 1µ H Be Careful during La you t pha se C1 1µ F www.
richtek.
com 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 ...


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