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RT9202 Datasheet

Single Synchronous Buck PWM DC-DC Controller

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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 RDS(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 RDS(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
1


  Richtek Technology Electronic Components Datasheet  

RT9202 Datasheet

Single Synchronous Buck PWM DC-DC Controller

No Preview Available !

RT9202
Typical Application Circuit
SHDN
H: shutdown
Q2
2N7002
R1
20K R4
10
D1
8
PHASE
BOOT 1
7
OCSET
UGATE 2
6
RT9202
FB GND
3
5 VCC
LGATE 4
C2 MA732
0.1µF
VOU T
2.5V
L2
5µH
+ C3
1000µF
C4
1µF R3
R2
120 255
C6
10nF
5V
MU
C5 + C1
1µF 470µF
ML
Fig.1 RT9202 powered from 5V only
H: shutdown
SHDN
Q1
2N7002
R4
R1 10
20K
8 PHASE
BOOT 1
7 OCSET UGATE 2
RT9202
6 FB
GND 3
5 VCC
C4
1µF
LGATE 4
R3
120
C2
1µF
VOU T
2.5V
R2
250
C6
10nF
L1
5µH
+ C3
1000µF
Fig.2 RT9202 powered from 12V
12V
5V
MU
C5 + C1
1µF 470µF
ML
www.richtek.com
2
DS9202-02 August 2002


Part Number RT9202
Description Single Synchronous Buck PWM DC-DC Controller
Maker Richtek
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RT9202 Datasheet PDF






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