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A8603KESTR-R 数据表(PDF) 18 Page - Allegro MicroSystems

部件名 A8603KESTR-R
功能描述  Multiple-Output Regulator for Automotive LCD Displays
PDF  42 Pages
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制造商  ALLEGRO [Allegro MicroSystems]
网页  http://www.allegromicro.com
标志 ALLEGRO - Allegro MicroSystems

A8603KESTR-R 数据表(HTML) 18 Page - Allegro MicroSystems

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Multiple-Output Regulator for
Automotive LCD Displays
A8603
18
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
R
1.8 V
DAC
I2C Register
0x04
7
VREF
1.8 V
Enable
Linear Regulator
2× Charge Pump
D1
D2
S1
S2
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
R
1.8 V
DAC
I2C Register
0x04
7
VREF
1.8 V
Enable
Linear Regulator
2× Charge Pump
(2× Charge Pump)
(3× Charge Pump)
D1
D2
S1
S2
C1
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
D3
D4
C3
C4
C2
(external)
Figure 5: Representative Block Diagram of the VGH Regulator in 3× Charge Pump Mode



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