3/4 Channel Parallel White/Blue LED Drivers
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.
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)
z PWM tuned LED brightness through EN pin
z Supply voltage range 2.7V~6.0V
z 0.1uA standby current
z Mobile phone
GND ... ...
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