Datasheet Allegro ALT80600 — Datenblatt

ALT80600
LED Driver with Pre-Emptive Boost
for Ultra-High Dimming Ratio and Low Output Ripple
FEATURES AND BENEFITS DESCRIPTION • Automotive AEC-Q100 qualified
• Wide input voltage range of 4.5 to 40 V for start/stop,
cold crank, and load dump requirements
• Fully integrated LED current sinks and boost converter
with internal power MOSFET
• Operate in Boost or SEPIC mode for flexible output
• Drives up to 11 series white LED in 4 parallel strings, at
up to 120 mA per string (VF = 3.3 V max).
• Programmable boost switching frequency or sync
externally from 200 kHz to 2.3 MHz
• Clock-Out feature for internal switching frequency
• Adjustable boost frequency dithering to reduce EMI
• Advanced control allows minimum PWM on-time down
to 0.3 µs, and avoids MLCC audible noises
• LED contrast ratio: 15,000:1 at 200 Hz using PWM
dimming alone, 150,000:1 when combining PWM and
analog dimming The ALT80600 is a multi-output LED driver for small-size
LCD backlighting. It integrates a current-mode boost converter
with internal power switch and four current sinks. The boost
converter can drive up to 44 white LEDs, 11 LED per string, …