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PDF PT4402 Data sheet ( Hoja de datos )
| Número de pieza | PT4402 | |
| Descripción | 3/4 Channel Parallel White/Blue LED Drivers | |
| Fabricantes | Micro Bridge Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PT4402 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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PT4401/2
3/4 Channel Parallel White/Blue LED Drivers
GENERAL DESCRIPTION
The PT4401/2 is a series of White/Blue LED drivers, with PT4401 capable of driving three LEDs and PT4402 driving
four LEDs. There is no external component needed, which helps to simplify the system design and lower the system cost
significantly. The circuit is optimized to provide over 90% efficiency. The PT4401/2 is ideal to drive white LEDs used for
Li-ion battery powered LCD displays. The LED brightness can be adjusted in real time through a PWM signal at the EN pin.
The target end applications are small color LCD displays in mobile phones, smart phone, digital cameras, PDA etc. PT4401
is available in SOT-23-6 package and PT4402 in MSOP-8 package, respectively.
FEATURES
APPLICATIONS
z No external component required
z Fixed 20mA or 15mA sinking current
z Individual current sink circuit for each output to prevent short/open
circuit on LEDs
z PTC LED current for luminosity compensation
z 3 channels (PT4401/SOT23-6) and 4 channels (PT4402/MSOP-8)
available
z PWM tuned LED brightness through EN pin
z Supply voltage range 2.7V~6.0V
z 0.1uA standby current
z Mobile phone
z PDAs
z MP3s
TYPICAL APPLICATION
VDD
VDD LED1
LED2
GND ... ...
EN LEDn
Micro Bridge Technology Co.,Ltd.
www.micro-bridge.com
Page 1
1 page  
PT4401/2
3/4 Channel Parallel White/Blue LED Drivers
TYPICAL PERFORMANCE CHARACTERISTICS
1. LED Current vs. Supply Voltage
2. PWM Dimming Control through EN pin
ILED vs Supply Voltage (V)
ILED=20mA, Vf=3.1V
25
ILED vs PWM Duty cycle
fPWM=1KHz, ILED=20mA, VDD=3.7V, Vf=3.1V
25
20
20
15
15
10
10
5
0
2.5 3.0 3.5 4.0
Supply Voltage (V)
Note: Vf is the forward Voltage of LED
3. Temperature Characteristics
4.5
5
5.0 0
0 20 40 60
PWM Duty cycle (%)
Note: Vf is the forward Voltage of LED
80
100
ILED vs Temperature
21.0
20.5
20.0
19.5
19.0
-20 0
20 40 60 80
Temperature (°C)
Micro Bridge Technology Co.,Ltd.
www.micro-bridge.com
Page 5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet PT4402.PDF ] | |
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