Boost LED driver with a 40V rail and dual dimming
The MAX1554ETA+T is a single-channel step-up (boost) LED driver from Analog Devices, purpose-built for backlight applications. It delivers up to 40V output from a 3.15V to 5.5V input rail, with an integrated switch rated for 970mA peak current — enough to drive a string of series-connected LEDs without an external FET. Dimming is handled either by analog current adjustment or PWM input, giving the designer flexibility between smooth brightness control and high-efficiency pulse-width modulation. The 40V output ceiling means it handles up to roughly 10-12 white LEDs in series, depending on forward voltage drop.
Package, temperature, and board-fit
Housed in an 8-pin WDFN with exposed pad (8-TDFN, 3x3mm), the MAX1554ETA+T requires a surface-mount reflow profile. The part is available in tape-and-reel or cut-tape formats, which matters for prototype builds vs production reels. ROHS3 compliant, no lead or halogen restrictions to flag for EU shipments.
Active production and sourcing reality
No pin-compatible second-source is documented from the manufacturer, so the BOM carries single-source risk — something to flag if volume ramps.