RT9202 Datasheet, PDF (1/16 Pages) Richtek Technology Corporation – SINGLE SYNCHRONOUS BUCK PWM DC-DC CONTROLLER

RT9202
Single Synchronous Buck PWM DC-DC Controller
General Description
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 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 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 R_DS(ON), which eliminates
the need for a current sensing resistor.
Applications
z Motherboard Power Regulation for Computers
z Subsystems Power Supplies
z Cable Modems, Set Top Box, and DSL Modems
z DSP and Core Communications processor Supplies
z Memory Power Supplies
z Personal Computer Peripherals
z Industrial Power Supplies
z 5V-Input DC-DC Regulators
z Low Voltage Distributed Power Supplies
Features
z Operate from 5V
z 0.8V Internal Reference
z Drive Two N-channel MOSFET
z Voltage Mode PWM Control
z Fast Transient Response
z Fixed 300kHz Oscillator Frequency
z Full 0~100% Duty Cycle
z Internal Soft Start
z Adaptive Non-overlapping Gate Driver
z Over-current Monitor Uses MOSFET R_DS(ON)
z Over-voltage Protection Uses Low-side
MOSFET
Pin Configurations
Part Number
Pin Configurations
RT9202CS
(Plastic SOP-8)
TOP VIEW
BOOT ¹
UGATE 2
8 PHASE
7 OCSET
GND 3
LGATE 4
6 FB
5 VCC
Ordering Information
RT9202… …
Package type
S : SOP-8
Operating temperature range
C: Commercial standard
DS9202-02 August 2002
www.richtek.com
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