|
|
PDF RT9378A Data sheet ( Hoja de datos )
| Número de pieza | RT9378A | |
| Descripción | 4 Channels 100mA x1/x1.5/x2 Charge Pump White LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de RT9378A (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
|
No Preview Available !
SacPower
RT9378A
4 Channels 100mA x1/x1.5/x2 Charge Pump White LED Driver
General Description
The RT9378A is a 4 channel WLED driver with auto mode
selection of x1, x1.5 and x2 mode with low dropout voltage
in current sources. The RT9378A can power up to 4 white
LEDs with regulated constant current for uniform intensity.
Each channel (LED1 to LED4) can support up to 25mA.
The part maintains highest efficiency by utilizing x1/x1.5/
x2 fractional charge pump and low dropout current
regulators. An internal 5-bit DAC is used for brightness
control. Users can easily configure up to 16-step of LED
current by enable pin.
The RT9378A is available in a WQFN-12L 2x2 package.
Small 0.22uF capacitors can be used for fly capacitors. It
provides the best backlighting solution with high efficiency
and smallest board space for portable application.
Ordering Information
RT9378A
Package Type
QW : WQFN-12L 2x2
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek 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.
Typical Application Circuit
CFLY1
0.22uF
CFLY2
0.22uF
VIN
2.8V to 4.5V
Pulse Dimming
3
C1P
5 VIN
CIN
1uF
6 EN
2, Exposed pad (13) GND
1 4 12
C1N C2P C2N
RT9378A
LED1 7
LED2 8
LED3 9
LED4 10
VOUT 11
COUT
1uF
Features
z Efficiency Up to 93% Over Li-ion Battery Discharge
z Typical 85% Average Efficiency Over Li-ion Battery
Discharge
z Support Up to 4 White LEDs
z Support Up to 25mA/Per Channel
z Support Up to 100mA Output Current
z Flexible 16-step Brightness Control
z 60mV Typical Current Source Dropout
z 1% Typical LED Current Accuracy
z 0.7% Typical LED Current Matching
z Automatic x1/x1.5/x2 Charge Pump Mode
Transition
z Low Input Noise and EMI Charge Pump
z 5V Over Voltage Protection
z Power On/Mode Transition In-rush Protection
z 1MHz Switching Frequency
z Typical 0.4uA Low Shutdown Current
z RoHS Compliant and Halogen Free
Applications
z Camera Phone, Smart Phone
z White LED Backlighting
Pin Configurations
(TOP VIEW)
12 11 10
C1N 1
9 LED3
GND 2
C1P 3
GND 8 LED2
13 7 LED1
456
WQFN-12L 2x2
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.
0755-83983280
1
1 page  
Typical Operating Characteristics
Efficiency vs. Input Voltage
100
90
80
70
60
50
40
30
20
10
LED VF = 3.42V
0
2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5
Input Voltage (V)
RT9378A
LED Current vs. Input Voltage
30
28.5
27
25.5
LED1
24 LED2
22.5 LED3
LED4
21
19.5
18
16.5
LED VF = 3.42V
15
2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5
Input Voltage (V)
x1 Mode Quiescent Current vs. Input Voltage
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5
Input Voltage (V)
Shutdown Current vs. Input Voltage
1.2
1
0.8
0.6
0.4
x2 Mode Quiescent Current vs. Input Voltage
4
3.75
3.5
3.25
3
2.75
2.5
2.25
2
1.75
1.5
1.25
1
2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5
Input Voltage (V)
x1 Mode Inrush Current Response
VIN = 3.7V
EN
(5V/Div)
VOUT
(2V/Div)
C2P
(2V/Div)
0.2
0
2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5
Input Voltage (V)
IIN
(200mA/Div)
Time (100us/Div)
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet RT9378A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| RT9378 | 4 Channels 100mA x1/x1.5/x2 Charge Pump White LED Driver | Richtek |
| RT9378A | 4 Channels 100mA x1/x1.5/x2 Charge Pump White LED Driver | Richtek |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |