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PDF RT9275 Data sheet ( Hoja de datos )
| Número de pieza | RT9275 | |
| Descripción | Step-up DC/DC Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9275 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Preliminary
RT9275
Tiny Package, High Efficiency, Step-Up DC/DC Converter
General Description
The RT9275 is a compact, high efficiency, and low voltage
step-up DC/DC converter with an Adaptive Current Mode
PWM control loop, includes an error amplifier, ramp
generator, comparator, switch pass element and driver in
which providing a stable and high efficient operation over a
wide range of load currents.
The low start-up input voltage below 1V makes RT9275
suitable for 1 to 4 battery cells applications. Both internal
2.5A switch and driver for driving external power devices
(NMOS or NPN) are provided. It is incorporating with soft-
start function, Under Voltage protection function.
RT9275 is available in SOT-23-6 package.
Ordering Information
RT9275
Package Type
E : SOT-23-6
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.
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 1V Low Start-up Input Voltage at 1mA Load
z Zero Shutdown Mode Supply Current
z 90% Efficiency
z 400kHz Switching Frequency
z Providing Flexibility for Using Internal and External
Power Switches
z Build Soft-Start function internally
z Under-Voltage Protection
z Small SOT-23-6 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z PDA
z DSC
z LCD Panel
z RF-Tags
z MP3
z Portable Instrument
z Wireless Equipment
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.
DS9275-06 March 2007
www.richtek.com
1
1 page  
Preliminary
RT9275
Typical Operating Characteristics
Frequency vs. Temperature
500
450
400
350
300
250
200
150
100
50
VIN = 2V, VOUT = 3.3V, ILOAD = 60mA
0
-20 -10 0 10 20 30 40 50 60 70 80 90
Temperature (°C)
1.252
Feedback vs. Temperature
1.25
1.248
1.246
VIN = 2V, VOUT = 3.3V, ILOAD = 60mA
1.244
-20 0 20 40
Temperature (°C)
60
80
Current Limit vs. Temperature
2.6
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2 VIN = 2V, VOUT = VDD = 3.3V
0
-20 -10 0 10 20 30 40 50 60 70 80
Temperature (°C)
90
Efficiency vs. Output Current
100
95
90
85
80
75
70
65
60
55
VOUT = 5V, TA = 25°C
50
1 10
VIN = 4.5V
VIN = 4.0V
VIN = 3.5V
VIN = 3.0V
VIN = 2.5V
VIN = 2.0V
VIN = 1.5V
100 1000
Output Current (mA)
Efficiency vs. Output Current
95
90
85
80
VIN = 3.0V
75 VIN = 2.5V
70 VIN = 2.0V
VIN = 1.5V
65 VIN = 1.0V
60
55
VOUT = 3.3V, TA = 25°C
50
1 10 100
Output Current (mA)
1000
Output Voltage vs. Output Current
3.32
3.31
3.3
3.29
3.28
3.27
VIN = 3.0V
VIN = 2.5V
VIN = 2.0V
VIN = 1.5V
VIN = 1.0V
3.26
VOUT = 3.3V
3.25
1
10
100
Output Current (mA)
1000
DS9275-06 March 2007
www.richtek.com
5
5 Page 
Preliminary
RT9275
Load Transient Respones
VIN = 1.5V, VOUT = 5V, IOUT = 10mA to 50mA
50
0
-50
40
20
0
Time (100μs/Div)
Load Transient Respones
VIN = 2.5V, VOUT = 5V, IOUT = 10mA to 100mA
50
0
-50
100
50
0
Time (100μs/Div)
Load Transient Respones
VIN = 3.5V, VOUT = 5V, IOUT = 10mA to 100mA
50
0
-50
100
50
0
Time (100μs/Div)
DS9275-06 March 2007
Load Transient Respones
VIN = 2V, VOUT = 5V, IOUT = 10mA to 100mA
50
0
-50
100
50
0
Time (100μs/Div)
Load Transient Respones
VIN = 3V, VOUT = 5V, IOUT = 10mA to 100mA
50
0
-50
100
50
0
Time (100μs/Div)
Load Transient Respones
VIN = 4V, VOUT = 5V, IOUT = 10mA to 100mA
50
0
-50
100
50
0
Time (100μs/Div)
www.richtek.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet RT9275.PDF ] | |
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