3-Channel Low-Dropout Constant-Current Parallel LED Driver with Current Setting Resistor
OVERVIEW
The CP2143, a 3-channel low-dropout constant-current parallel LED driver, can be used to drive white LED, blue LED or any color LED whose forward operating voltage is lower than the battery voltage. The unique Smart-MirrorTM technology is introduced in CP2143, which can guarantee a constant LED current in various operating conditions. Without capacitor or inductor, only one resistor is needed for setting the current of the LEDs. The CP2143 is available in a space-saving Pb-free SOT23-6L package.
FEATURES
• 38¦ÌA supply current, can be powered by a GPIO port low as 2.5V
• LED¡¯s current set by external resistor, up to 40mA per channel supported
• Only 150mV dropout voltage needed at 20mA per channel
• LED current matching: ¡À0.3% (typical)
• PWM dimming control or DC voltage control supported
• Over 90£¥ efficiency can be reached
• No EMI and switch noise
• Thermal shutdown protection
• Shutdown current less than 0.1¦ÌA
APPLICATIONS
• Mobile phones
• Digital still camera
• MP3 players
• PDAs
• GPS receivers
• Torches
