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The LT3598EUF is a high-efficiency, multi-channel LED driver IC in a 24-pin QFN (4mm × 4mm) package, ideal for high-precision backlighting and display applications. The chip uses a boost topology to drive up to 6 strings of LEDs, with each string capable of delivering up to 30mA of current, and features ±1.5% current matching accuracy to ensure uniform LED brightness.

Product Attributes — LT3598EUF

Product Type: LED Lighting Driver IC    

Series: LT3598    

Mounting Style: SMD/SMT    

Package/Case: QFN-24    

Number of Outputs: 6 Outputs    

Output Current: 30 mA    

Input Voltage - Maximum: 30 V

Input Voltage - Minimum: 3.2 V    

Topology: Boost    

Operating Frequency: 200 kHz to 2.5 MHz    

Output Voltage: 44 V    

Minimum Operating Temperature: -40°C    

Maximum Operating Temperature: +125°C

Key Features

High-precision current regulation

±1.5% LED current matching ensures uniformity of display backlighting.

Supports PWM and analogue dimming, with a dimming ratio of up to 3000:1 (PWM) and 10:1 (analogue).

Wide input voltage range

3.2 V to 30 V input, suitable for single-cell lithium batteries, 12 V/24 V industrial power supplies, and other applications.

Output voltage up to 44 V, capable of driving multiple series-connected LEDs.

Programmable switching frequency

Supports adjustable frequencies from 200kHz to 2.5MHz, can synchronise with an external clock, and optimises EMI design.

Comprehensive protection features  

Open-circuit LED protection (OPENLED alarm)  

Overvoltage protection (OVP)  

Temperature derating control (to prevent LED overheating).  

Low-power design  

Extremely low standby current (<1μA), suitable for battery-powered devices.

Applications — LT3598EUF

Laptop computer displays

Mid-sized displays

Automotive liquid crystal displays

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