MC34844EP

• Product Introduction

MC34844EP 10-channel LED backlit driver with integrated power supply

MC34844/A is a high-efficiency, LED-backlit LCD display that uses drivers from 10" to 27". Operating from 7V to 28V supply, MC34844/A is capable of traveling more than 150 LEDs in 10 series and parallel. The 10 strings in the current are matched within ±2% and can be programmed via the I2C/SM-bus interface. The MC34844/A also includes an LED dimming pulse width modulation (PWM) generator. The LED light can be dimmed to 256 levels and programmed through the I2C/SM-bus interface. Therefore, a dimming ratio of up to 65,000:1 (PWM 256:1, 256:1 current output DAC) can be supported. An external PWM input can also be used. Multiple devices can synchronize PWM frequencies to reduce picture noise. Noise is also reduced by supporting frequencies up to 27KHZ (34844 in the range of 100Hz to 25kHz and 110HZ to 27KHZ 34844A). MC34844/A also supports temperature and light Features -------------------------------------------------- ------------------------------ Input voltage from 7V to 28V Output voltage up to 60V, headroom control 2.5A integrated boost LED current up to 50 mA per channel (34844) up to 80 LED current per channel (34844A) 90% efficiency (DC:DC) 10-channel current mirror for ±2% current matching I2C/SMBus interface 8-bit programmable current DAC User programmable overvoltage protection (OVP) LED fault detection and OTP/OCP/UVLO locking Programmable or synchronized PWM frequency from 100 to 25,000 Hz 34844 34844A 32-LD 5x5x0.8mm TQFN Lead-Free Package with Programmable or Synchronized PWM Frequencies from 110 to 27,000 Hz This product is included in Freescale's long-term product availability program, which guarantees availability for at least 10 years before launch

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