MAX8784ETL+ Maxim Integrated Products, MAX8784ETL+ Datasheet - Page 12

• Manufacturer Part Number: MAX8784ETL+
• Description: IC REG STP UP W/AMP 40-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8784ETL+

• Applications: LCD TV/Monitor
• Voltage - Supply: 4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 40-TQFN Exposed Pad
• Operating Supply Voltage: 4 V to 5.5 V
• Maximum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Maximum Power Dissipation: 2857 mW
• Minimum Operating Temperature: + 85 C
• Supply Current: 4 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Step-Up Regulator, Internal Charge Pumps, Switch
Control, and Operational Amplifier for TFT LCDs
The typical operating circuit (Figure 1) of the MAX8784
is a power-supply system for TFT-LCD panels in moni-
tors and TVs. The circuit generates a +14V source-dri-
ver supply, a +28V positive gate-driver supply, and a
-9V negative gate-driver supply from a 5V ±10% input
supply. Table 1 lists the selected components and
Table 2 lists the contact information of the component
suppliers.
The MAX8784 is a multiple-output power supply
designed primarily for TFT-LCD panels used in monitors
Figure 1. Typical Operating Circuit
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-9V, 20mA
VIN = 4.5V TO 5.5V
VGOFF
10µF
C3
Typical Operating Circuit
187kΩ
10kΩ
10kΩ
20kΩ
1µF
C1
R1
R2
R3
R4
AVDD
Detailed Description
VCOM
VCOM
VCOM
0.22µF
D2
C2
1µF
C4
V
POS3
OUT3
POS1
NEG1
OUT1
POS2
OUT2
FBN
NEG2
BGND
HVS
REF
AGND
DRVN
PGND
CC
AVDD
SUP
10µF
C14
BGND
C5
0.1µF
MAX8784
C1N
0.1µF
C6
C1P
C15
10µF
C2N
0.1µF
Table 1. Component List
C7
C14, C15
C12, C13
3µH
C2P
L1
COMP
SHDN
PGND
GDEL
POUT
ADEL
RSET
C1
D1
D2
GON
DRN
L1
CTL
FBP
LX
FB
100kΩ
R9
1µF ±10%, 6.3V X5R ceramic capacitor (0402)
TDK C1005X5R0J105K
10µF ±20%, 6.3V X5R ceramic capacitors (0603)
TDK C1608X5R0J106M
10µF ±20%, 16V X5R ceramic capacitors (1206)
TDK C3216X5R1C106M
3A, 30V Schottky diode (M-flat)
Toshiba CMS02 (top mark S2)
220mA, 100V dual diode (SOT23)
Fairchild MMBD4148SE (top mark D4)
3.0µH, 3A
Sumida CDRH6D28-3R0
TCON
VIN
R6
428kΩ
R5
20kΩ
C9
0.1µF
C11
330pF
1µF
D1
DC
C8
inductor
R8
82kΩ
C10
0.01µF
AVDD
10µF
VGON
28V, 20mA
R11
204kΩ
R10
20kΩ
R7
1kΩ
C12
C13
10µF
AVDD
14V, 0.75A