RT9206
High Efficiency, Synchronous Buck with Dual Linear
Controllers
General Description
The RT9206 is a low cost, combo power controller, which
integrates a synchronous step-down voltage-mode PWM
and two HV linear controllers. Directly drive external
N-MOSFET makes it easy to implement a high efficiency
and cost attractive power solution. Voltage mode control
loop and constant operation frequency with external
compensation network provide better stability in wide
operation range. Adjustable operation frequency up to
600kHz can minimize the inductor size and PCB space. It
is particularly suitable in wide input voltage range (from
4.75V to 28V) and multi-output applications.
Linear controller features flexible linear power design.
Delivered power can be simply decided by external
N-MOSFET selection. Output voltage level is chosen via
external resistor divider. The 0.8V internal reference can
satisfy most of the applications. Under voltage lockout
provide cost effective protection of output.
RT9206 provides complete safety protection function: soft
start, over current protection, over voltage and under voltage
protection. Set current limit by choosing different MOSFET.
Synchronous Buck control mode provides excellent over
voltage protection by turning on low side MOSFET to
prevent any damage of end device from abnormal voltage
stress as over voltage condition occurs.
Features
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Wide Input Range (4.75V to 28V)
0.8V Internal Reference
High Efficiency Synchronous Buck Topology
Integrate two HV Linear Controllers
Low cost N-MOSFET Design
Duty Cycle from 0% to 90%.
Adjustable switching frequency from 200kHz to
600kHz, Default 200kHz
Sense OCP by low Side MOSFET R
DS(ON)
Power Good Signal Output
RoHS Compliant and 100% Lead (Pb)-Free
Applications
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LCD Monitor
Desk Note
IEEE1394 Client
Desktop IA
Broadband
Pin Configurations
(TOP VIEW)
LDRV1
VDD
LDRV2
LFB2
COMP
FB
PGOOD
SS/EN
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LFB1
BOOT
UGATE
PHS
VINT
LGATE
GND
RT
Ordering Information
RT9206
Package Type
S : SOP-16
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.
SOP-16
DS9206-11 March 2007
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
