Typical Operating Characteristics (continued)
(VDD = 19V, GND = 0, VCM = VOUT = VDD/2, TA = +25°C, unless otherwise specified.)
0
2
1
4
3
7
6
5
8
-50
0
-25
25
50
75
100
125
SUPPLY CURRENT
vs. TEMPERATURE
MAX9650
toc04
TEMPERATURE (
°C)
SUPPLY
CURRENT
(mA)
IOUT
(500mA/div)
VOUT
(125mV/div)
LOAD TRANSIENT
SOURCING
MAX9650
toc05
TIME (1
μs/div)
0.1A RESPONSE
1A RESPONSE
0.5A RESPONSE
IOUT
(500mA/div)
VOUT
(125mV/div)
LOAD TRANSIENT
SINKING
MAX9650
toc06
TIME (1
μs/div)
0.1A RESPONSE
1A RESPONSE
0.5A RESPONSE
100ms/div
STARTUP WAVEFORM
IDD
10mA/div
VDD
10V/div
VIN
5V/div
VOUT
5V/div
MAX9650 toc07
2
μs/div
MAX9650 STEP RESPONSE
WITH VARIOUS CL
VOUT
5V/div
VOUT
5V/div
VOUT
5V/div
VOUT
5V/div
MAX9650 toc08
CL = 10pF
CL = 2200pF
CL = 0.01
μF
CL = 0.022μF
OPEN-LOOP GAIN AND PHASE
vs. FREQUENCY
MAX9650 toc09
FREQUENCY (Hz)
GAIN
(dB)
10E+6
1E+6
10E+3
100E+3
1E+3
100E+0
-60
-40
-20
0
20
40
60
80
100
120
-80
10E+0
100E+6
GAIN
PHASE
CL = 100pF
-180
-120
-60
0
60
120
180
240
300
360
-240
PHASE
(DEG)
CLOSED-LOOP SMALL-SIGNAL FREQUENCY
RESPONSE FOR VARIOUS CL
MAX9650
toc10
FREQUENCY (MHz)
VOLTAGE
GAIN
(dB)
10
1
0.1
-10
-5
0
5
10
15
20
-15
0.01
100
CL = 0.1
μF
CL = 0.01
μF
CL = 100pF
CL = 56pF
CL = 10pF
CL = 560pF
CL = 0.001
μF
CL = 0.0022
μF
High-Current VCOM Drive Op Amps
for TFT LCDs
4
Maxim Integrated
MAX9650/MAX9651
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX9650
toc11
FREQUENCY (Hz)
GAIN
(dB)
10E+6
1E+6
-6
-5
-4
-3
-2
-1
0
1
2
3
-7
100E+3
100E+6
VOUT = 100mVP-P
RL = 10k
Ω TO VDD/2
SMALL-SIGNAL GAIN vs. FREQUENCY
WITH VARIOUS CL
MAX9650
toc12
FREQUENCY (Hz)
GAIN
(dB)
10E+6
1E+6
-20
-15
-10
-5
0
5
10
15
20
-25
100E+3
100E+6
10,000pF
1000pF
100pF
10pF
VOUT = 100mVP-P
RL = 10k
Ω TO VDD/2