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PDF RT9269 Data sheet ( Hoja de datos )
| Número de pieza | RT9269 | |
| Descripción | Constant Current LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9269 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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Preliminary
RT9269
Tiny Package, High Efficiency,
Constant Current LED Driver
General Description
The RT9269 is a compact, high efficient LED driver
with high flexibility of application configurations in
charge pump mode or in boost rectifier mode,
delivering Tens of mA constant output current for
driving 1~4 white LED’s.
The 0.25V low reference voltage minimized the
power loss across the current-setting resistor.
Features
0.25V Low Reference Voltage
17µA Quiescent (Switch-off) Supply Current
Zero Shutdown Mode Supply Current
85% Efficiency
500kHz Fixed Switching Rate
Tuning LED brightness with CE pin ON/OFF
Duty
Small SOT-26 Package
The wide applicable VDD range makes RT9269
suitable for 1 to 4 battery cell applications as well as
being supplied with 2.5/3.3/5/6V system powers.
The 500kHz high switching rate minimized the size
of external components. Besides, the 17µA low
quiescent current together with high efficiency
maintains long battery lifetime.
The output current is set with 1 external resistor.
And the chip enable (CE) pin can be used for tuning
the LED brightness by controlling the ON/OFF duty
with external clock. RT9269 is provided in SOT-26
package.
Ordering Information
RT9269
Package Type
E : SOT-26
Operating Temperature Range
C: Commercial Standard
Applications
LED Module
Hand Held Panel
Compact Back Light Module
Small Battery Charger
Constant Current Source
Pin Configurations
Part Number
RT9269CE
(Plastic SOT-26)
Pin Configurations
TOP VIEW
654
123
1. CE
2. EXT
3. GND
4. LX
5. VDD
6. FB
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.
DS9269-01 March 2003
www.richtek.com
1
1 page  
Preliminary
Typical Operating Characteristics
RT9269
Efficiency vs. Input Voltage
89
4 LEDs, L = 47 µH
87
85
IOUT = 20 mA
83
IOUT = 15 mA
81
79
2.5 3 3.5 4 4.5 5 5.5 6
Input Voltage (V)
Efficiency vs. Vin
85
6 LEDs, L = 33 µH
84
83
82 IOUT = 20mA
81
80 IOUT = 15mA
79
3 3.5 4 4.5 5
VIN(V)
5.5
6
600
500
400
300
200
100
0
0
Frequency vs. VDD
FB = GND, TA = 25°C
123456
VDD (V)
Efficiency vs. Input Voltage
100
90 IOUT = 20mA @ VIN > 3.8V
80
70 IOUT = 15mA @ VIN > 3.6V
60
Refer to Application Circuit Fig. 2
50
3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
VFB vs. Ambient Temperature
256
254
252
250
248
246
244
-40
-20 0 20 40 60
Ambient Temperature (°C)
80
Efficiency vs. Output Current
100
90
80
70 VIN = 4.2V
60
50
VIN = 2.7V
VIN = 3.6V
40
30
20
0.1
1 10
Output Current (mA)
100
DS9269-01 March 2003
www.richtek.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet RT9269.PDF ] | |
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