Description

The SC504 is a 4-channel, highly integrated, high-efficiency step-up (boost) HB LED driver designed to reduce

the thickness of mid-size LCD displays. It features a wide input voltage range (4.5V to 27V), phase-shifted PWM

dimming, analog dimming, a flexible output configuration, an I2C interface, and numerous protection features.

Features

Input Voltage — 4.5V to 27V

Output Voltage — Up to 50V

Step-up (Boost) Controller

  Ultra-Fast Transient Response (<00μs)

  Programmable Switching Frequency

Linear Current Sinks

  4 Strings, up to 20mA/String

  Current Matching ±%

  Current Accuracy ±2%

PWM Dimming

  String-by-String Phase Shifting

  Input Dimming Frequency 00Hz-30kHz

  User Selectable 9 or 0-Bits Dimming Resolution

5-Bits Analog Dimming

I2C Interface

  Fault Status — Open/Short LED, UVLO, OTP

  Device Control: PLL Setting

Protection Features

  Open/Shorted LED(s) and adjustable OVP

  Over-Temperature and UVLO Shutdown Protection

4mm X 4mm 20-pin QFN Package



Applications

Ultrabooks^TM,  All-in-One  PCs,  Monitors,  Automotive Display Backlighting

Backlighting for Mid-Size Displays