FEATURES AND BENEFITS

• Wide 5 to 37 V input voltage range

□ 40 V absolute maximum for load dump

□ 4.5 V UVLO falling for idle stop

• Wide output voltage, up to 70 V OVP rating

• Single-ended topology controller with internal gate

drivers for low-side and high-side external MOSFETs

□ Topology options including boost and buck-boost

□ Unique topology changeover option for high/low beam

□ Unique slew rate control to minimize current

overshoot/undershoot during high/low transition

• Complementary gate drivers for high/low beam applications

• Options for SPI control or programmable EEPROM for

design parameters, eliminates need for local microcontroller

• Internal PWM generator and driver to control external

dimming MOSFET

• Fixed frequency operation with programmable dithering

for EMC mitigation

• Constant current regulation

• Extensive fault detection and reporting through SPI or

hardwired fault signals

• Analog dimming options for LED binning, input voltage

foldback, and temperature foldback via NTC

• 5 V / 50 mA linear regulator to power external circuitry

• Four programmable current settings to adapt to LED

binning

DESCRIPTION

The A80803 is a switch-mode, constant-current DC/DC

controller for high-power LED automotive lighting applications.

The controller is based on a programmable fixed frequency,

peak current mode control architecture and can be configured

in multiple different switching topologies to suit different

application requirements.

Both a low-side and high-side gate driver are included to control

the external power MOSFETs. Two additional gate drivers are

integrated to enable/disable part of the LED string to simplify

high/low beam applications.

Diagnostics can be reported through SPI or via the two fault

pins. The SPI interface can also be used to control many

configuration options of the A80803. Alternatively, these

options can be factory-programmed and stored in EEPROM

to remove the need for a local microcontroller.

LED brightness can be controlled by a PWM signal on the EN/

PWM pin or by an internal PWM signal configured via SPI.

An internal driver controls a MOSFET in series with the LED

string to optimize dimming. The PWMOUT driver strength is

programmable via SPI to optimize LED current during PWM

transitions. LED current foldback is provided for low input

voltage and thermal events.

The A80803 is available in a thermally enhanced 32-pin 5 mm

× 5 mm QFN package with wettable flank.

APPLICATIONS

• Automotive lighting applications