MAX9550 Maxim, MAX9550 Datasheet - Page 7

• Manufacturer Part Number: MAX9550
• Description: The MAX9550/MAX9551/MAX9552 provide a VCOM source for TFT LCDs
• Manufacturer: Maxim

The output load capacitor must have a low ESR value
(50mΩ or lower) and it must be placed as close as pos-
sible to the OUT pin to ensure buffer stability (see
Figure 2). Ceramic capacitors are an excellent choice.
The MAX9550/MAX9551/MAX9552 operate from a 6V to
20V single supply, or from ±3V to ±10V dual supplies.
Proper supply bypassing ensures stability while driving
high transient loads. The MAX9550/MAX9551/MAX9552
require minimum 4.7µF (C1) and 0.1µF (C2) power-sup-
ply bypass capacitors placed as close as possible to
Figure 2. Typical TFT-LCD Backplane Drive Circuit
Power Supplies and Bypass Capacitors
V
REF
Applications Information
_______________________________________________________________________________________
*C2 = 0.1µF
IN+
IN-
Output Load Capacitor
SUPPLY
16V
MAX9550
GND
V
High-Current VCOM Drive Buffers
DD
OUT
*C1 = 4.7µF
C
L
= 1µF
V
OUT
the power-supply pin (V
supply operation, use 4.7µF and 0.1µF bypass capaci-
tors on both supplies (V
capacitor placed as close as possible to the V
GND pins.
The exposed paddle on the µMAX and TSSOP pack-
ages provides a low thermal resistance for heat dissi-
pation. Solder the exposed paddle to a ground plane
for best results. Do not route traces under these pack-
ages. For dual-supply operation, the exposed paddle
(EP) must be electrically connected to the negative
supply or it can be left unconnected.
*PLACE 4.7µF AND 0.1µF CAPACITORS AS CLOSE TO PIN AS POSSIBLE.
NOTE: PLACE C
AND KELVIN SENSE THE FEEDBACK LOOP CONNECTION AS SHOWN.
L
AS CLOSE TO THE OUT PIN AS POSSIBLE
for TFT LCDs
DD
TFT LCD
Layout and Grounding
DD
). See Figure 2. For dual-
TFT-LCD
CAPACITANCE
and GND) with each
DD
and
7