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RT9202B Datasheet

Single Synchronous Buck PWM DC-DC Controller

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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 RDS(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 RDS(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
GND
LGATE
2
3
4
8 PHASE
7 OCSET
6 FB
5 VCC
SOP-8
DS9202B-03 March 2007
www.richtek.com
1
Free Datasheet http://www.datasheet4u.


  Richtek Technology Electronic Components Datasheet  

RT9202B Datasheet

Single Synchronous Buck PWM DC-DC Controller

No Preview Available !

RT9202B
Typical Application Circuit
SHND
H : shutdown
Q1
2N7002
R1
20K R4 10
8
7
6
5
C4
1uF
PHASE BOOT 1
OCSET UGATE 2
3
FB GND
VCC LGATE 4
RT9202B
C2
0.1uF
VOUT
2.5V
R3 R2
120 255
C6
D1
MA732
L2
5uH
C3
1000uF
10nF
Figure 1. RT9202B powered from 5V only
5V
MU
C5 C1
1uF 470uF
ML
R4
12V
R1 10
5V
20K
SHND
H : shutdown
8 PHASE BOOT 1
C2
1uF
Q1
2N7002
5V
7
6
5
C4
1uF
OCSET UGATE
FB GND
VCC LGATE
RT9202B
R3
2
VOUT
3 2.5V
4
R2
L1
5uH
C3
1000uF
120 250
C6
10nF
Figure 2. RT9202B powered from 12V and 5V
MU
C5 C1
1uF 470uF
ML
www.richtek.com
2
DS9202B-03 March 2007
Free Datasheet http://www.datasheet4u.com/


Part Number RT9202B
Description Single Synchronous Buck PWM DC-DC Controller
Maker Richtek
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RT9202B Datasheet PDF






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