A8603: Multiple-Output Regulator for Automotive LCD Displays


The A8603 is a fixed-frequency, multiple-output supply for LCD bias. Its switching frequency can be either programmed or synchronized with an external clock signal between 350 kHz and 2.25 MHz. This will minimize interference with AM and FM radio bands.

An I2C-compliant serial interface allows a system microcontroller to configure the A8603 by writing into its internal registers. A system controller can also access A8603’s status registers in case of fault conditions.

The A8603 incorporates a boost stage followed by two linear regulators and two charge-pump regulators. Each output voltage can be programmed independently through serial interface. During power-up and shutdown, the outputs are turned on and off in preprogrammed sequences with adjustable delay. This will meet the sequencing requirements for specific LCD panels.

Short-circuit protection is provided for all outputs. The boost switch is protected against overcurrent and overvoltage.

The A8603 comes in a 24-pin 4 × 4 mm QFN package, with exposed thermal pad to allow operation at high ambient temperatures. It is lead (Pb) free with 100% matte-tin leadframe plating.


  • GPS
  • Infotainment
  • Medium LCDs

Top Features

  • Automotive-grade AEC-Q100 qualified
  • Input voltage from 3 to 10 V
  • Four individual output supplies
  • Independent control of each output voltage
  • Boost switching frequency: 350 kHz to 2.25 MHz
  • External synchronization capability is available
  • Frequency dithering to reduce EMI
  • Less than 10 µA shutdown current
  • Protection features: overcurrent, overvoltage, short-circuit, and thermal overload protection
  • Fully programmable outputs through I2C
    • Regulator voltage
    • Startup/shutdown sequences
    • Fault retry counter

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
APEK8603KES-01-MH DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Distributor Stock
A8603KESTR-J 24-lead QFN -40°C to 125°C Yes View Data New Contact your
local sales rep
Distributor Stock
A8603KESTR-R 24-lead QFN -40°C to 125°C Yes View Data Contact your
local sales rep
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.