IS31LT3554 Datasheet, PDF (1/13 Pages) Integrated Silicon Solution, Inc – BOOST TYPE LED DRIVER WITH 4-CHANNEL CURRENT SOURCE

IS31LT3554
BOOST TYPE LED DRIVER WITH 4-CHANNEL CURRENT SOURCE
Advanced Information
August 2014
GENERAL DESCRIPTION
The IS31LT3554 is a LED driver based on a highly
efficient boost controller operating over a wide input
voltage range of 4.5V to 33V.
The IS31LT3554 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 20mA to 180mA. 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 IS31LT3554 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 IS31LT3554 is available in a thermally enhanced
eTSSOP-16 package.
FEATURES
 Input voltage range: 4.5V to 33V
 4-Channel LED current sinks, 180mA per string
 LED current adjustable from 20mA to 180mA
 String-to-string current matching accuracy: 1.5%
 Adjustable operating frequency: 100kHz to 1MHz
 External PWM dimming
 High contrast ratio
 Less than 3µA shutdown current
 Programmable soft-start
 Built-in protection features
• OCP, OTP, UVLO
• Open/short LED protection
• Programmable OVP
• Schottky Diode/inductor short-circuit protection
APPLICATIONS
 LCD Monitor/TV
 LED lighting
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev. 00A, 08/01/2014