FEATURES AND BENEFITS
• AEC-Q100 qualified
• VIN range: 5.3 to 40 V supply, operates down to 5.1 V
when enabled
• Four independent MOSFET drivers
• Internal and external PWM dimming options
□ Internal PWM dimming set by resistor divider or
analog voltage
□ External PWM dimming set by microcontroller
• Flexible LED analog dimming options
□ Two ADIM pins for LED binning, NTC feedback, or
hybrid analog/PWM dimming
□ Adjustable integrated LED current derating for
elevated VIN
□ Integrated LED current derating for elevated IC
junction temperature
• Combine A80804 devices in parallel for higher number
of LED strings; PWMOUT signal available when used
with internal PWM for master/slave operation
• MINOUT signal available to trim a pre-regulator to
minimize power loss
• Selectable LED current slew rate limit during PWM
dimming
• Extensive fault detection and protection
□ Drain short-to-ground detection
□ Drain short-to-VIN
□ Open LED
□ Thermal protection
□ Programmable input UVLO
DESCRIPTION
The A80804 and A80804-1 are linear, programmable current
controllers capable of accurately regulating current in four
LED strings using external MOSFETs. Each of the four LED
drivers has an independent enable/PWM input and current-sense
resistors and can be independently dimmed with an external
PWM signal, or all channels can be dimmed with internal PWM
dimming and automatic phase shifting. The overall LED current
can be switched between low and full intensity for applications
including stop/tail or DRL/position lighting. Multiple analog
dimming options are available to support applications including
LED binning, NTC foldback, or hybrid dimming. A selectable
LED current slew-rate control is available to tune PWM edge
times and improve EMI performance.
The MINOUT feature allows for trimming an external DC-DC
converter to optimize the voltage across the linear current
regulating MOSFETs to minimize power loss.
The A80804 offers several fault detection and protection options
including MOSFET drain short-to-ground, drain short-to-VIN,
open-LED fault protection, internal overtemperature protection,
and undervoltage lockout. The A80804 can be configured for
either one-out-all-out or one-out-continue operation.
The A80804 has a 500 mV current-sense reference for improved
BCI performance. The A80804-1 has a 200 mV current-sense
reference for lower power dissipation in the sense resistor.
The device is packaged in a 32-pin QFN (ET) with exposed pad
for enhanced thermal dissipation and wettable flank construction
for solderability and visual inspection.
APPLICATIONS
• Automotive medium-power LED
lighting systems
• Fog lights, backup lights, daytime
running lights, position lights,
sequential light