A8601 Datasheet, PDF (1/32 Pages) Allegro MicroSystems – The A8601 is a fixed frequency, multiple-output supply for LCD bias.

A8601
Multiple-Output Regulator for Automotive LCD Displays
Features and Benefits
• Automotive Grade AEC-Q100 qualified
• Five individual output supplies
• Independent control of each output voltage
• 350 kHz to 2.25 MHz switching frequency with external
synchronization capability
• <10 μA shutdown current
• Preprogrammed power-up and shutdown sequences
• Overcurrent, overvoltage, short circuit, and thermal
overload protection
Applications:
• GPS
• Infotainment
• Medium LCDs
Package: 28-pin TSSOP with exposed
thermal pad (suffix LP)
Description
The A8601 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, to minimize interference with AM and FM
radio bands.
A total of five output voltages are provided, from three linear
regulators and two charge-pump regulators. Each output
voltage can be adjusted independently. During power-up and
shutdown, the outputs are turned on and off in preprogrammed
sequences, to 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. Input
disconnect protection is achieved by driving an external
P-MOSFET.
28-pin exposed thermal pad TSSOP package allows operation
at high ambient temperatures. It is lead (Pb) free with 100%
matte-tin leadframe plating.
Not to scale
System Block Diagram
Optional
VIN
R_SC
Q1
L1
D1
A8601-DS, Rev. 1
External Sync
VIN INS GATE
SW OUT _{VDVDD 3.3 V}
DVDD
EN1
EN2
A8601
V_AVDD 5 to 14 V
AVDD
FSET_SYNC
V_VGH 10 to 25 V
VGH
+
LCD Panel
V_VIN
V_VGL – 5 to –12 V
VGL
1.5 to 3.2 V
FAULT
VINAMP
V_VCOM 3 to 6 V
VCOM
+
Output voltages shown are
for typical LCD Panel