MAX8798ETX+ Maxim Integrated Products, MAX8798ETX+ Datasheet - Page 14

• Manufacturer Part Number: MAX8798ETX+
• Description: IC INTERNAL-SW BOOST REG 36-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8798ETX+

• Applications: LCD Monitor, Notebook Display
• Current - Supply: 400µA
• Voltage - Supply: 1.8 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-TQFN Exposed Pad
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Maximum Power Dissipation: 2179.8 mW
• Minimum Operating Temperature: + 85 C
• Supply Current: 4 uA
• Input Voltage: 4V
• Output Current: 400mA
• Output Voltage: 18V
• No. Of Outputs: 2
• Power Dissipation Pd: 2.18W
• Supply Voltage Range: 1.8V To 5.5V
• No. Of Pins: 36
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Internal-Switch Boost Regulator with
Integrated 3-Channel Scan Driver for TFT LCDs
14
28, 29
30, 31
PIN
20
21
22
23
24
25
26
27
32
33
34
35
36
—
______________________________________________________________________________________
BOOST
NAME
BGND
VCOM
COMP
AGND
PGND
GOFF
GON
OUT
NEG
POS
FB
LX
EP
IN
Amplifier Ground
Operational Amplifier Supply Input. Connect to V
greater ceramic capacitor.
Adjustable Sink-Current Output. OUT connects to the resistive voltage-divider at the op amp input POS
(between BOOST and GND) that determines the VCOM output voltage. I
a programmable amount.
Operational Amplifier Noninverting Input
Operational Amplifier Inverting Input
Operational Amplifier Output
Shutdown Control Input. Pull
and scan driver functions remain enabled.
Step-Up Regulator Supply Input. Bypass IN to AGND (pin 34) with a 1μF or greater ceramic capacitor.
Switching Node. Connect inductor/catch diode here and minimize trace area for lowest EMI.
Power Ground. Source connection of the internal step-up regulator power switch.
Feedback Input. Reference voltage is 1.24V nominal. Connect external resistor-divider
midpoint here and minimize trace area. Set V
Compensation Input for Error Amplifier. Connect a series RC from COMP to AGND. Typical values are
180k
Ground
Gate-Off Supply. GOFF is the negative supply voltage for the CKV, CKVB, and STVP high-voltage driver
outputs. Bypass to PGND with a minimum of 0.1μF ceramic capacitor.
Gate-On Supply. GON is the positive supply voltage for the CKV, CKVB, and STVP high-voltage driver
outputs. Bypass to V
Exposed Backside Pad. Connect to the analog ground plane through multiple vias to enhance thermal
performance.
and 470pF.
MAIN
or PGND with a minimum of 0.1μF ceramic capacitor.
low to disable the step-up regulator. The VCOM calibrator, op amp,
OUT
FUNCTION
MAIN
according to: V
(Figure 2) and bypass to BGND with a 1μF or
Pin Description (continued)
OUT
= 1.24V (1 + R1/R2).
OUT
lowers the divider voltage by