RT9209 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – Synchronous Buck PWM DC-DC with Enable & PGOOD

RT9209/A
Synchronous Buck PWM DC-DC with Enable & PGOOD
General Description
The RT9209/A 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 into
a small 8-pin package.
The RT9209/A uses an internal compensated 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 260kHz/
400kHz oscillator reduce the component size for saving
board area.
The RT9209/A future a enable control pin to shutdown PWM
switching and a 90% power good flag indicator. The FB
pin under voltage detection function monitor the output
short circuit which trigger a three time hiccup sequence
to latch off the chip function.
Ordering Information
RT9209/A
Package Type
S : SOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
400kHz
260kHz
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
z Operates at 5V
z 0.8V Internal Reference
z Drives Two N-MOSFET
z Voltage Mode PWM Control
z Fast Transient Response
z Fixed 260kHz/400kHz Oscillator Frequency
z Dynamic 0 to 100% Duty Cycle
z Internal PWM Loop Compensation
z Internal Soft-Start
z Adaptive Non-Overlapping Gate Driver
z Over-Voltage Protection Uses Lower MOSFET
z RoHS Compliant and 100% Lead (Pb)-Free
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
Pin Configurations
(TOP VIEW)
FB
VCC
LGATE
GND
8
2
7
3
6
4
5
SOP-8
SS
PGOOD
BOOT
UGATE
DS9209/A-08 March 2007
www.richtek.com
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