RT9202B Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – Single Synchronous Buck PWM DC-DC Controller

RT9202B
Single Synchronous Buck PWM DC-DC Controller
General Description
The RT9202B is a single power supply PWM DC-DC
converter controller designed to drive N-MOSFET in a
synchronous buck topology. The IC integrates the control,
output adjustment, monitoring and protection functions in
a small 8-pin package.
The RT9202B 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.
The RT9202B 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 R_DS(ON), which eliminates the need for a current
sensing resistor.
Ordering Information
RT9202B
Package Type
S : SOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
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.
Features
l Operate From 5V
l 0.8V Internal Reference
l Drive Two N-MOSFETs
l Voltage Mode PWM Control
l Fast Transient Response
l Fixed 300kHz Oscillator Frequency
l Full 0 to 100% Duty Cycle
l Internal Soft Start
l Adaptive Non-Overlapping Gate Driver
l Over-Current Monitor Uses MOSFET R_DS(ON)
l Over-Voltage Protection Uses Low-Side MOSFET
l RoHS Compliant and 100% Lead (Pb)-Free
Applications
l Motherboard Power Regulation for Computers
l Subsystems Power Supplies
l Cable Modems, Set Top Box, and DSL Modems
l DSP and Core Communications processor Supplies
l Memory Power Supplies
l Personal Computer Peripherals
l Industrial Power Supplies
l 5V-Input DC-DC Regulators
l Low Voltage Distributed Power Supplies
Pin Configurations
(TOP VIEW)
BOOT
UGATE 2
GND 3
LGATE 4
8
PHASE
7
OCSET
6 FB
5 VCC
SOP-8
DS9202B-03 March 2007
www.richtek.com
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