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  Richtek Technology Electronic Components Datasheet  

RT9268 Datasheet

Step-up DC/DC Converter

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Preliminary
RT9268
Tiny Package, 1.3MHz, Step-up DC/DC Converter
General Description
The RT9268 is a compact, 1.3MHz, step-up DC/DC
converter with a current mode PWM control loop,
providing a stable and efficient operation without external
compensation.
The high switching frequency makes RT9268 suitable
for ADSL applications providing sufficient output current
for variant types of line drivers. This device is available
in space-saving SOT-23-6 package.
The output voltage is set with 2 external resistors. Both
internal 2A switch and driver for driving external power
devices (NMOS or NPN) are provided.
Ordering Information
RT9268
Package Type
E : SOT-23-6
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
Note :
RichTek Pb-free 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.
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
Features
z 1.3MHz Switching Frequency
z Below 2V Low Start-up Input Voltage
z Sufficient Supply Capability for Supplying XDSL
Line Drivers
z Zero Shutdown Mode Supply Current
z Providing Flexibility for Using Internal and External
Power Switches
z Small SOT-23-6 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z XDSL Line Drivers
z USB Devices
z PCMCIA Cards
z Mini-PCI Cards
Pin Configurations
(TOP VIEW)
FB VDD LX
65 4
123
EN EXT GND
SOT-23-6
Note : There is no pin1 indicator on top mark for SOT-23-6
type, and pin 1 will be lower left pin when reading top mark
from left to right.
DS9268-06 March 2005
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9268 Datasheet

Step-up DC/DC Converter

No Preview Available !

RT9268
Typical Application Circuit
Preliminary
VIN
0.3V to 5.5V
C2
10uF
L1
3.3uF
C3
1uF
D1
C1 Q1
1uF N MOS
VDD
EXT
RT9268
LX
EN
FB
GND
L2
C4
0.1uF
C5
1uF
R1
12k
R2
910
VOUT
18V
C6
10uF
L2 : CL321611T-R22K-S/ YAGEO
Figure 1. RT9268 Application for XDSL 18V Line Drivers
VIN
4.5V to 5.2V
C1
1uF
VDD
EN
C2
10uF
L1
3.3uF
C3
1uF
D1
EXT
RT9268
GND
Q1
N MOS
LX
FB
L2
D2
C4
0.1uF
C5
1uF
R1
8.6K
R2
1k
D3
C8
10uF
VOUT1
C6 12V
10uF
VOUT2
-12V
L2 : CL321611T-R22K-S/ YAGEO
Figure 2. RT9268 Application for USB-XDSL ±12V Line Drivers
www.richtek.com
2
DS9268-06 March 2005


Part Number RT9268
Description Step-up DC/DC Converter
Maker RICHTEK
PDF Download

RT9268 Datasheet PDF






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