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IS31LT3554 Datasheet(PDF) 1 Page - Integrated Silicon Solution, Inc |
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IS31LT3554 Datasheet(HTML) 1 Page - Integrated Silicon Solution, Inc |
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1 / 13 page  IS31LT3554 Integrated Silicon Solution, Inc. – www.issi.com 1 Rev. 00A, 08/01/2014 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 |
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