MAX8795A Maxim Integrated Products, MAX8795A Datasheet - Page 13

• Manufacturer Part Number: MAX8795A
• Description: TFT-LCD DC-DC Converter
• Manufacturer: Maxim Integrated Products

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(Circuit of Figure 1, V
A: OUTPUT VOLTAGE, 1V/div, AC-COUPLED
B: OUTPUT CURRENT, 50mA/div
PIN
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
LOAD-TRANSIENT RESPONSE
OPERATIONAL-AMPLIFIER
400ns/div
NAME
AGND
BGND
PGND
OUT1
NEG1
OUT2
NEG2
OUT3
NEG4
POS1
POS2
POS3
POS4
SRC
SUP
REF
IN
______________________________________________________________________________________
= 5V, V
MAX8795A toc15
Switch Input. Source of the internal high-voltage p-channel MOSFET. Bypass SRC to PGND with a
minimum 0.1µF capacitor close to the pins.
Reference Bypass Terminal. Bypass REF to AGND with a minimum of 0.22µF close to the pins.
Analog Ground for Step-Up Regulator and Linear Regulators. Connect to power ground (PGND)
underneath the IC.
Power Ground. PGND is the source of the main step-up n-channel power MOSFET. Connect PGND to
the output-capacitor ground terminals through a short, wide PCB trace. Connect to analog ground
(AGND) underneath the IC.
Operational-Amplifier 1 Output
Operational-Amplifier 1 Inverting Input
Operational-Amplifier 1 Noninverting Input
Operational-Amplifier 2 Output
Operational-Amplifier 2 Inverting Input
Operational-Amplifier 2 Noninverting Input
Analog Ground for Operational Amplifiers. Connect to power ground (PGND) underneath the IC.
Operational-Amplifier 3 Noninverting Input
Operational-Amplifier 3 Output
Operational-Amplifier Power Input. Positive supply rail for the operational amplifiers. Typically
connected to V
Operational-Amplifier 4 Noninverting Input
Operational-Amplifier 4 Inverting Input
MAIN
= 14V, V
A
0V
+50mA
B
0mA
-50mA
GON
MAIN
TFT-LCD DC-DC Converter with
Typical Operating Characteristics (continued)
= 25V, V
. Bypass SUP to BGND with a 0.1µF capacitor.
A: INPUT SIGNAL, 5V/div
B: OUTPUT SIGNAL, 5V/div
GOFF
OPERATIONAL-AMPLIFIER
LARGE-SIGNAL RESPONSE
= -10V, T
1µs/div
Operational Amplifiers
A
= +25°C, unless otherwise noted.)
FUNCTION
V
SUP
MAX8795A toc16
= 15V
A
0V
B
0V
A: INPUT SIGNAL, 100mV/div
B: OUTPUT SIGNAL, 100mV/div
OPERATIONAL-AMPLIFIER
SMALL-SIGNAL RESPONSE
Pin Description
400ns/div
MAX8795A toc17
A
0V
B
0V
13