Preliminary
RT9203/A
Dual Regulators - Synchronous Buck PWM DC-DC and
Linear Controller
General Description
The RT9203/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 8-pin package.
The RT9203/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 RT9203/A also features over voltage protection
(OVP) and under voltage lock-out (UVLO).
Features
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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
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Ordering Information
RT9203/A
Package Type
S : SOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
UVP : Hiccup Mode
UVP : Latch Mode
Note :
RichTek Pb-free and Green products are :
}RoHS
compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
}Suitable
for use in SnPb or Pb-free soldering processes.
}100%matte
tin (Sn) plating.
PC Motherboard
Cable Modems, Set-Top-Box, and DSL 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
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Pin Configurations
(TOP VIEW)
BOOT
UGATE
GND
LGATE
2
3
4
8
7
6
5
FB
FBL
DRV
VCC
SOP-8
DS9203/A-10 March 2007
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
