Datasheet Allegro ALT80800 — 数据表

ALT80800
Automotive-Grade, Constant-Current 2.0 A
PWM Dimmable Synchronous Buck LED Driver
FEATURES AND BENEFITS DESCRIPTION • • • • The ALT80800 is a synchronous buck switching regulator
that provides constant-current output to drive high-power
LEDs. It integrates both high-side and low-side N-channel
DMOS switches for DC-to-DC step-down conversion. A true
average current is output using a cycle-by-cycle, controlled
on-time method. • • • • • • • • • • • • AEC-Q100 qualified
Supply voltage 4.5 to 55 V
2.0 A maximum output over operating temperature range
Integrated high-side and low-side MOSFETs:
200 mΩ / 150 mΩTYP
True average output current control
Internal control loop compensation
Integrated 5 V, 14 mA LDO regulator for peripheral circuits
Dimming via PWM pin or EN pin down to 0.1% at 200 Hz
Analog dimming (ADIM pin) for brightness calibration
and thermal foldback
Low-power shutdown (1 µA typical)
Cycle-by-cycle current limit
Active low fault flag output
LED open fault mask setting for low VIN operation …