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.
The RT9202 uses a lowgain voltagemode 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 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.
Features
l Operate From 5V
l 0.8V Internal Reference
l Drive TwoN-Channel 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 AdaptiveNon-Overlapping Gate Driver
l Over-Current Monitor Uses MOSFET RDS(ON)
l Over-Voltage Protection Uses Low-SideMOSFET
Pin Configurations
Applications
l Motherboard Power Regulation for Computers
l Subsystems Power Supplies
l Cable Modems, Set Top Box, and DSLModems
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
