IS32BL3552

IS32BL3552 BOOST TYPE LED DRIVER WITH 2-CHANNEL CURRENT SOURCE Preliminary Information August 2014 GENERAL DESCRIPTION The IS32BL3552 is a white LED driver for backlight applications based on a highly efficient boost controller operating over a wide input voltage range of 4.5V to 33V. The IS32BL3552 contains four regulated current sources with 1.5% (Typ.) current matching between strings for a uniform LED brightness. Each current source can be programmed via an external resistor to drive from 40mA to 360mA. A fast slew rate current source allows high frequency and narrow pulse width dimming signals to achieve a very high contrast ratio. The device operating frequency can be adjusted from 0.1MHz to 1MHz. The IS32BL3552 has safety protection features to prevent damage during fault conditions. Protection features include an internal soft-start circuit to prevent a high inrush current during startup, open/short LED protection to automatically disable a faulty current source, over temperature protection (OTP), cycle-by-cycle current limit, under voltage lockout (UVLO), programmable OVP, VOUT short / Schottky diode open protection and Schottky Diode short-circuit protection. The IS32BL3552 is available in a thermally enhanced eTSSOP-16 package. FEATURES  Input voltage range: 4.5V to 33V  2-Channel LED current sinks, 360mA per string  LED current adjustable from 40mA to 360mA  String-to-string current matching accuracy: 1.5%  Adjustable operating frequency: 100kHz to 1MHz ...