RT9202
Single Synchronous Buck PWM DC-DC Controller
General Description
Features
The RT9202 is a single power supply PWM DC-DC
converter controller designed to drive N-Channel
MOSFET in a synchronous buck topology. The IC
integrates the control, output adjustment, monitoring and
protection functions in a small 8-pin package.
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The RT9202 uses a low gain voltage mode PWM control
for simple application design. An internal 0.8V reference
allows the output voltage to be precisely regulated to
low voltage requirement. A fixed 300kHz oscillator
reduces the component size for saving board space.
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The RT9202 features over current protection, over
voltage protection, and under voltage lock-out. The output
current is monitored by sensing the voltage drop across
the MOSFET's RDS(ON), which eliminates the need for a
current sensing resistor.
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Applications
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Ordering Information
RT9202
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Package Type
S : SOP-8
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
Note :
Operate From 5V
0.8V Internal Reference
Drive Two N-Channel MOSFETs
Voltage Mode PWM Control
Fast Transient Response
Fixed 300kHz Oscillator Frequency
Full 0 to 100% Duty Cycle
Internal Soft Start
Adaptive Non-Overlapping Gate Driver
Over-Current Monitor Uses MOSFET RDS(ON)
Over-Voltage Protection Uses Low-Side MOSFET
RoHS Compliant and 100% Lead (Pb)-Free
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Motherboard Power Regulation for Computers
Subsystems Power Supplies
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
Pin Configurations
RichTek Pb-free products are :
(TOP VIEW)
−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.
BOOT
8
PHASE
UGATE
2
7
OCSET
GND
3
6
FB
LGATE
4
5
VCC
SOP-8
DS9202-06 March 2005
www.richtek.com
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