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Analog Devices Inc. MAX25169 6-Channel Backlight LED Driver is a LED backlight driver IC and highly integrated TFT power supply for automotive TFT-LCD applications. This IC integrates one boost converter, two gate-driver supplies, one inverting buck-boost converter, and a boost/SEPIC controller that can power 1 to 6 strings of LEDs in the display backlight.
The source-driver power supplies consist of a boost converter that can provide up to +18V in unipolar mode. It includes an inverting buck-boost converter that can generate a voltage down to -10.5V. The AVDD output can deliver up to 300mA at 13.5V, while NAVDD can provide up to 200mA. The positive source-driver supply-regulation voltage (VAVDD) is set through I2C or internal NV memory. The negative source-driver supply voltage (VNAVDD) is always tightly regulated to -VAVDD. The source-driver supplies operate from an input voltage between 2.65V and 5.5V.
The gate-driver power supplies consist of regulated charge pumps that generate up to +31.5V and down to -18V and can deliver up to 15mA each. The IC features a 6-string LED driver with input switch control (NGATE) that can power up to 6 strings of LEDs with 150mA (max) of current per string. The Analog Devices Inc. MAX25169 is available in a 7mm x 7mm, 48-pin TQFN package with an exposed pad. It operates over the -40°C to +125°C ambient temperature range.
