A8603KESTR-R datasheet(18/42 Pages) ALLEGRO

18 / 42 page

Multiple-Output Regulator for

Automotive LCD Displays

A8603

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

The A8603 uses a 2× charge pump to generate VGH from boost

voltage. If necessary, a 3× charge pump can be implemented at

the VGH3 pin using external components. See Representative

Block Diagrams as shown in Figures 4 and 5. Depending on the

VOUT

VGH

CP11

CP12

VGH3

AGND

Target Voltage

From boost

output

OCP

To boost

controller

CVGH

500

Discharge

1.8 V

DAC

I2C Register

0x04

VREF

1.8 V

Enable

Linear Regulator

2× Charge Pump

External

Fly

Cap

Switching Sequence:

• S1 and D1 = on: charging external fly cap

• S2 and D2 = on: dumping to VGH

(external)

Figure 4: Representative Block Diagram of the VGH Regulator in 2× Charge Pump Mode

VGL/VGH Charge Pumps

magnitude of VGH, using a 3× charge pump may lower the boost

output voltage and hence improve the system efficiency. See

Boost Controller section for details.

VOUT

VGH

CP11

CP12

VGH3

AGND

Target Voltage

From boost

output

OCP

To boost

controller

500

Discharge

1.8 V

DAC

I2C Register

0x04

VREF

1.8 V

Enable

Linear Regulator

2× Charge Pump

(2× Charge Pump)

(3× Charge Pump)

Switching Sequence:

•S1 and D1 = on: charging up ﬂying caps C1 and C2

•S2 and D2 = on: discharging C1 to VGH and C2 to VGH3

(external)

Figure 5: Representative Block Diagram of the VGH Regulator in 3× Charge Pump Mode

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