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PDF RT9300B Data sheet ( Hoja de datos )
| Número de pieza | RT9300B | |
| Descripción | Low Dropout Current Source | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Preliminary
RT9300A/B
Tiny Package, Low Dropout Current Source
General Description
The RT9300A/B low-dropout bias supply for white LEDs
is a high-performance alternative to the simple ballast
resistors used in conventional white LED designs. The
RT9300A/B uses a internal resistor to set the bias
current for four LEDs, which are matched to 3%. The
www.DataSRheTe9t43U0.c0oAm/B's advantages over ballast resistors include
much lower bias variation with supply voltage variation,
significantly lower dropout voltage, and in some applications,
significantly improved efficiency. The RT9300A/B requires
a 60/45mV dropout at a 20/15mA load on each output to
match the LED brightness.
Ordering Information
RT9300A/B
Package Type
E : SOT-23-6
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Sink Current
A : 20mA
B : 15mA
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.
Typical Application Circuit
Features
z Low 60/45mV Dropout at 20/15mA
z 3% LED Current Matching
z Simple LED Brightness Control
z 2.5V to 5.5V Supply Voltage Range
z Thermal Shutdown Protection
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Next-Generation Wireless Handsets
z PDAs, Palmtops, and Handy Terminals
z Digital Cameras, Camcorders
z Battery-Powered Equipment
Pin Configurations
(TOP VIEW)
LED1 LED2 LED3
65 4
123
EN GND LED4
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.
VIN
PWM
6 5 43
LED1 LED2 LED3 LED4
1 EN
RT9300A/B
GND
2
C
0.1uF
DS9300A/B-02 March 2007
Figure 1. Application circuit for backlight.
www.richtek.com
1
1 page  
Preliminary
RT9300A/B
Typical Operating Characteristics
18
16
14
12
10
8
www.DataSheet4U.com6
4
2
0
2
LED Current vs. Input Voltage
LED 1
LED 2
LED 3
LED 4
2.5 3 3.5 4 4.5
Input Voltage (V)
5
Output Current vs. VEN
18
16
14
12
10
8
6
4
2
0
1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5
VEN (V)
LED Current vs. Temperature
15.5
15.4
15.3
15.2
15.1
15
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Temperature (°C)
Dimming Operation
EN Pin
Voltage
(2V/Div)
IEN Current vs. VEN Supply Voltage
400
VIN = 3.5V
350
300
250
200
150
100
50
0
1.5 2 2.5 3 3.5 4 4.5
VEN Supply Voltage (V)
EN Pin Shutdown Response
VEN = 0V to 3V
EN Pin
Voltage
(2V/Div)
LED
Current
(10mA/Div)
LED
Current
(10mA/Div)
Time (50μs/Div)
Time (50μs/Div)
DS9300A/B-02 March 2007
www.richtek.com
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet RT9300B.PDF ] | |
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