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PDF RT9268 Data sheet ( Hoja de datos )
| Número de pieza | RT9268 | |
| Descripción | Step-up DC/DC Converter | |
| Fabricantes | RICHTEK | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9268 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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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
1 page  
Preliminary
RT9268
Typical Operating Characteristics
Efficiency vs.Output Current
100
VOUT = 12V
TA = 25°C
90
VIN
5.5V
5.2V
80 5.5V
4.5V
70
60
50
40
0.1
1 10 100
Output Currrent (mA)
1000
Output Voltage vs. Output Current
12.5
VOUT = 12V
12.4 TA = 25°C
12.3
12.2
12.1
VIN = 5.5V
12
11.9
VIN = 5.5V VIN = 5.5V VIN = 5.5V
11.8
11.7
11.6
0
25 50 75 100 125 150 175 200
Output Current (mA)
Efficiency vs. Output Current
90
VOUT = 18V
TA = 25°C
80
70 VIN
5.5V
5.0V
60 5.2V
4.5V
50
0.1
1 10 100
Output Current (mA)
1000
Input Current vs. Input Voltage
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5
Input Voltage (V)
DS9268-06 March 2005
Output Voltage vs. Output current
17.8
17.78
17.76
17.74
17.72
17.7
17.68
VIN
5.5V
5.0V
5.2V
4.5V
17.66
17.64 VOUT = 18V
17.62 TA = 25°C
17.6
0 20
40 60 80
Output Current (mA)
100 120
Start - up Waveform
VIN = 5V
VOUT = 12V
LX
IOUT = 200mA
TA = 25°C
Time (5ms/Div)
www.richtek.com
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet RT9268.PDF ] | |
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