max9650azk Maxim Integrated Products, Inc., max9650azk Datasheet - Page 5

• Manufacturer Part Number: max9650azk
• Description: High-current Vcom Drive Op Amps For Tft Lcds
• Manufacturer: Maxim Integrated Products, Inc.

The MAX9650/MAX9651 operational rail-to-rail
input/output amplifiers hold the VCOM voltage stable
while providing the ability to source and sink a high cur-
rent quickly (1.3A) into a capacitive load such as the
backplane of a TFT-LCD panel.
The MAX9650/MAX9651 are capable of high output
currents and feature thermal-shutdown protection with
temperature hysteresis. When the die temperature
reaches +170°C, the device shuts down. When the die
cools down by 15°C, the device turns on again. In a
TFT-LCD application, the duty cycle is very low. Even
with high values of voltage and current, the power dissi-
pation is low and the chip does not shut down.
The MAX9650/MAX9651 are designed to drive capaci-
tive loads. A small value of series resistance improves
the performance of the device to ensure stability and
fast settling with very large or very small capacitive
loads. In many cases, this resistance is already present
due to connection resistance in the wiring and no addi-
tional physical resistor is necessary.
SOT23
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—
—
—
—
1
2
3
4
5
MAX9650
µMAX
1, 5, 8
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Applications Information
6
4
3
2
7
PIN
with Temperature Hysteresis
_______________________________________________________________________________________
Detailed Description
MAX9651
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—
1
4
3
2
8
5
6
7
Thermal Shutdown
High-Current VCOM Drive Op Amps
NAME
OUTA
OUTB
INA+
INB+
GND
INA-
INB-
N.C.
Output Load
V
EP
DD
VCOM Output A
Ground
Positive Input A
Negative Input A
Positive-Supply Input. Bypass V
possible to the device.
Positive Input B
Negative Input B
VCOM Output B
No Connection. Not internally connected.
Exposed Pad. EP is internally connected to GND. Connect EP to GND.
The MAX9650/MAX9651 operate from a 9V to 20V single
supply or from ±4.5V to ±10V dual supplies. Proper sup-
ply bypassing ensures stability while driving high tran-
sient loads. The MAX9650/MAX9651 require a minimum
10µF (C1) and 0.1µF (C2) power-supply bypass capaci-
tors placed as close as possible to the power-supply pin
Figure 1. Settling Time Test Circuit
V
REF
SUPPLY
Power Supplies and Bypass Capacitors
19V
**(R
*10μF and 0.1μF CAPACITORS AS CLOSE AS POSSIBLE TO THE PIN.
*C2 = 0.1μF
S
= R
GEN
IN_+
IN_-
) x C
SUPPLY
DD
19V
LCD
FUNCTION
to GND with a 0.1µF capacitor as close as
MAX9650
x 6 < 2μs, WHERE R
GND
V
DD
for TFT LCDs
OUT_
*C1 = 10μF
GEN
V
Pin Description
OUT_
= GENERATOR SOURCE IMPEDANCE.
RS =
2.2Ω
LCD VCOM LOAD
**0V TO 2.2V
AT 50kHz
C
0.1μF
LCD
=
5