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MAX9650/MAX9651
High-Current VCOM Drive
Op Amps for TFT LCDs
General Description
The MAX9650/MAX9651 are single- and dual-channel
VCOM amplifiers with rail-to-rail inputs and outputs. The
MAX9650/MAX9651 can drive up to 1300mA of peak
current per channel and operate up to 20V.
The MAX9650/MAX9651 are designed to source and sink
a high current quickly to hold the VCOM voltage stable in
large TFT-LCD panels.
The MAX9650/MAX9651 feature 40V/μs slew rate and
35MHz bandwidth to quickly settle outputs for 120Hz
frame rate and full HD television.
The MAX9650/MAX9651 feature output short-circuit
protection and thermal shutdown. These devices are
available in exposed pad packages for excellent heat
dissipation.
Applications
●● TFT-LCD Panels
●● Instrument Control Voltage Sources
Features
●● 1300mA Peak Output Current
●● Rail-to-Rail Inputs and Outputs
●● Operates Up to 20V
●● 40V/μs Slew Rate
●● 35MHz Bandwidth
●● 5mA Quiescent Current per Channel
●● Excellent Heat Dissipation (Exposed Pad)
Pin Configurations and Ordering Information appear at end
of data sheet.
Typical Operating Circuit
16V
VDD
MAX9650
VREF
TFT LCD
IN_+
OUT_
IN_-
*RS
GND
*RS MAY BE NEEDED FOR SOME APPLICATIONS.
19-4187; Rev 8; 1/19
TFT-LCD
CAPACITANCE
MAX9650/MAX9651
High-Current VCOM Drive
Op Amps for TFT LCDs
Absolute Maximum Ratings
Supply Voltage (VDD to GND)................................-0.3V to +22V
Any Other Pin to GND............................... -0.3V to (VDD + 0.3V)
IN_+/IN_- (current)............................................................±20mA
OUT_ (current)......................................................................1.3A
Continuous Power Dissipation (TA = +70°C)
SOT23 (derate 3.7mW/°C above +70°C)..................297.4mW
μMAX-EP (derate 12.9mW/°C
above +70°C)..........................................................1030.9mW
TDFN-EP (derate 23.8mW/°C
above +70°C)..........................................................1951.2mW
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
SOT23
Package Code
Z5+2A
Outline Number
21-0113
Land Pattern Number
90-0241
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θJA)
146.4
Junction to Case (θJC)
93.5
µΜAX®-EP
Package Code
U8E+2
Outline Number
21-0107
Land Pattern Number
90-0145
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θJA)
97
Junction to Case (θJC)
5
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θJA)
77.6
Junction to Case (θJC)
5
μMAX is a registered trademark of Maxim Integrated Products, Inc.
www.maximintegrated.com
Maxim Integrated │ 2
MAX9650/MAX9651
High-Current VCOM Drive
Op Amps for TFT LCDs
Package Information (continued)
TDFN-EP
Package Code
T833+2
Outline Number
21-0137
Land Pattern Number
90-0059
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θJA)
54
Junction to Case (θJC)
8
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θJA)
41
Junction to Case (θJC)
8
Electrical Characteristics
(VDD = 19V, VGND = 0V, VCM = VOUT = VDD/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage Range
VDD
Guaranteed by PSRR
Quiescent Current
IDD
Per channel
High Output Voltage
VOH
IH = +5mA, VIN = VDD
Low Output Voltage
VOL
IL = -5mA, VIN = 0V
Input Offset Voltage
VOS
MIN
6
3.7
VDD 0.30
TA = +25°C
-14
TA = -40°C to +125°C
-17
0.01
AV
RL = 10kΩ, CL = 50pF
0.99
VDD = 6V to 20V, VCM = VOUT = 3V
70
Common-Mode Input Voltage
Range
CMVR
Inferred from CMRR test
0.5
Common-Mode Rejection
Ratio
CMRR
0.5V ≤ VCM ≤ VDD - 0.5V
60
IO
VOUT = 9.5V (Note 2)
VDD = 15V, VOUT = 7.5V
Transient Peak Output
Current
IPK
(Note 3)
Bandwidth
BW
-3dB
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MAX9650AZK+
20
MAX9650AUA+
80
MAX9650ATA+
mA
V
+17
At VIN = 9.5V
PSRR
8
+14
IFB
Power-Supply Rejection
Ratio
V
3.5
-0.2
Voltage Gain
20
0.30
IOUT = 0mA to +80mA
Input Bias Current
UNITS
0.05
+0.2
LR
MAX
VDD 0.05
IOUT = 0mA to -80mA
Load Regulation
Continuous Output Current
TYP
mV
mV/mA
1
µA
1.01
V/V
95
dB
VDD 0.5
80
V
V
dB
mA
±350
±1.3
A
35
MHz
Maxim Integrated │ 3
MAX9650/MAX9651
High-Current VCOM Drive
Op Amps for TFT LCDs
Electrical Characteristics (continued)
(VDD = 19V, VGND = 0V, VCM = VOUT = VDD/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Slew Rate
SR
4V step, CL = 50pF, RL = 10kΩ, AV = +1V/V
40
V/µs
Settling Time
tS
Settling to 0.1% of VOUT, IL = 0 to 1000mA,
RS = 2.2Ω, CS = 0.1µF (Figure 1)
2.0
µs
Maximum Load Capacitance
CLOAD
(Note 4)
150
nF
Noninverting Input Resistance
RIN+
(Note 5)
100
MΩ
Inverting Input Resistance
RIN-
(Note 5)
100
MΩ
Input Capacitance
CIN
Thermal Shutdown
Thermal Shutdown Hysteresis
3
pF
+170
°C
15
°C
Note
Note
Note
Note
1: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
2: Continuous output current is tested with one output at a time.
3: See the Thermal Shutdown with Temperature Hysteresis section.
4: A series resistor can extend load capacitance range. The settling time can be optimized by a small series resistance.
See the Applications Information section for more information.
Note 5: Inputs are protected by back-to-back diodes.
Typical Operating Characteristics
(VDD = 19V, GND = 0, VCM = VOUT = VDD/2, TA = +25°C, unless otherwise specified.)
TA = +125°C
2
1
0
TA = +25°C
-1
TA = -40°C
-2
7
6
4
0
12
15
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18
21
VOUT
(125mV/div)
2
-4
SUPPLY VOLTAGE (V)
0.1A RESPONSE
3
1
9
IOUT
(500mA/div)
5
-3
6
LOAD TRANSIENT
SOURCING
MAX9650 toc05
3
8
INPUT OFFSET VOLTAGE (mV)
MAX9650 toc01
INPUT OFFSET VOLTAGE (mV)
4
INPUT OFFSET VOLTAGE DEVIATION
vs. TEMPERATURE
MAX9650 toc02
INPUT OFFSET VOLTAGE DEVIATION
vs. SUPPLY VOLTAGE
0.5A RESPONSE
1A RESPONSE
-50
-25
0
25
50
75
100
125
TIME (1µs/div)
TEMPERATURE (°C)
Maxim Integrated │ 4
MAX9650/MAX9651
High-Current VCOM Drive
Op Amps for TFT LCDs
Typical Operating Characteristics (continued)
(VDD = 19V, GND = 0, VCM = VOUT = VDD/2, TA = +25°C, unless otherwise specified.)
SUPPLY CURRENT
vs. TEMPERATURE
IOUT
(500mA/div)
5
4
IOUT
(500mA/div)
0.1A RESPONSE
1A RESPONSE
3
VOUT
(125mV/div)
2
1
0
MAX9650 toc06
6
MAX9650 toc05
7
SUPPLY CURRENT (mA)
LOAD TRANSIENT
SINKING
MAX9650 toc04
8
LOAD TRANSIENT
SOURCING
VOUT
(125mV/div)
0.5A RESPONSE
0.5A RESPONSE
1A RESPONSE
-50
-25
0
25
50
75
100
125
0.1A RESPONSE
TIME (1µs/div)
TIME (1µs/div)
TEMPERATURE (°C)
MAX9650 toc08
IDD
10mA/div
CL = 10pF
VDD
10V/div
CL = 2200pF
CL = 0.01µF
VIN
5V/div
VOUT
5V/div
SMALL-SIGNAL GAIN
vs. FREQUENCY
CL = 10pF
0
-15
CL = 56pF
0.01
0.1
1
FREQUENCY (MHz)
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180
40
120
VOUT = 100mVP-P
RL = 10kΩ TO VDD/2
10
100
20
0
60
PHASE
0
-60
-40
-120
-60
-180
15
SMALL-SIGNAL GAIN vs. FREQUENCY
WITH VARIOUS CL
VOUT = 100mVP-P
RL = 10kΩ TO VDD/2
10
10,000pF
1000pF
5
-1
-2
-3
100pF
0
-5
-10
-5
-15
-6
-20
-7
100E+3
1E+6
300
-20
20
0
-4
CL = 100pF
-10
VOUT
5V/div
GAIN (dB)
CL = 560pF
-5
1
CL = 0.001µF
CL = 0.1µF
5
MAX9650 toc10
CL = 0.01µF
10
GAIN (dB)
VOLTAGE GAIN (dB)
15
2
240
60
MAX9650 toc11
CLOSED-LOOP SMALL-SIGNAL FREQUENCY
RESPONSE FOR VARIOUS CL
3
360
-240
-80
10E+6
10E+0
1E+3
100E+3
100E+0
1E+6
100E+6
10E+3
FREQUENCY (Hz)
2µs/div
CL = 0.0022µF
CL = 100pF
80
VOUT
5V/div
CL = 0.022µF
MAX9650 toc09
GAIN
100
VOUT
5V/div
100ms/div
20
120
VOUT
5V/div
10E+6
FREQUENCY (Hz)
100E+6
MAX9650 toc12
MAX9650 toc07
OPEN-LOOP GAIN AND PHASE
vs. FREQUENCY
-25
100E+3
10pF
1E+6
10E+6
100E+6
FREQUENCY (Hz)
Maxim Integrated │ 5
PHASE (DEG)
MAX9650 STEP RESPONSE
WITH VARIOUS CL
GAIN (dB)
STARTUP WAVEFORM
MAX9650/MAX9651
High-Current VCOM Drive
Op Amps for TFT LCDs
Pin Description
PIN
MAX9650
NAME
SOT23
μMAX-EP,
TDFN-EP
MAX9651
(μMAX-EP,
TDFN-EP)
1
6
1
OUTA
VCOM Output A
2
4
4
GND
Ground
3
3
3
INA+
Positive Input A
4
2
2
INA-
Negative Input A
5
7
8
VDD
Positive-Supply Input. Bypass VDD to GND with a 0.1μF capacitor as
close as possible to the device.
—
—
5
INB+
Positive Input B
—
—
6
INB-
Negative Input B
—
—
7
OUTB
VCOM Output B
—
1, 5, 8
—
N.C.
—
—
—
EP
FUNCTION
No Connection. Not internally connected.
Exposed Pad (μMAX and TDFN Only). EP is internally connected to GND.
Connect EP to GND.
Detailed Description
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 current quickly
(1.3A) into a capacitive load such as the backplane of a
TFT-LCD panel.
Thermal Shutdown
with Temperature Hysteresis
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 TFTLCD application, the duty cycle is very low. Even with high
values of voltage and current, the power dissipation is low
and the chip does not shut down.
www.maximintegrated.com
19V
SUPPLY
*C2 = 0.1µF
19V
SUPPLY
*C1 = 10µF
VDD
MAX9650
VREF
LCD VCOM LOAD
IN_+
OUT_ VOUT_
IN_GND
RS =
2.2Ω
CLCD =
0.1µF
**0V TO 2.2V
AT 50kHz
*10µF and 0.1µF CAPACITORS AS CLOSE AS POSSIBLE TO THE PIN.
**(RS = RGEN) x CLCD x 6 < 2ms, WHERE RGEN = GENERATOR SOURCE IMPEDANCE.
Figure 1. Settling Time Test Circuit
Maxim Integrated │ 6
MAX9650/MAX9651
High-Current VCOM Drive
Op Amps for TFT LCDs
Applications Information
Output Load
The MAX9650/MAX9651 are designed to drive capacitive 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 additional physical resistor is necessary. For minimum series
resistance required for stability with capacitive loading, see
Figure 2.
Power Supplies and Bypass Capacitors
The MAX9650/MAX9651 operate from a 6V to 20V
single supply or from ±4.5V to ±10V dual supplies. Proper
supply bypassing ensures stability while driving high
transient loads. The MAX9650/MAX9651 require a
minimum 10μF (C1) and 0.1μF (C2) power-supply bypass
capacitors placed as close as possible to the powersupply pin (VDD). See Figure 3. For dual-supply operation,
use 10μF and 0.1μF bypass capacitors on both supplies
(VDD and GND) with each capacitor placed as close as
possible to VDD and GND.
Layout and Grounding
The exposed pad on the μMAX and TDFN packages
provides a low thermal resistance for heat dissipation.
Solder the exposed pad to a ground plane for best
thermal performance. Do not route traces under these
packages. For dual-supply operation, the exposed pad
(EP) can be electrically connected to the negative supply
or it can be left unconnected.
16V
SUPPLY
2.0
1.8
*C2 = 0.1µF
19V
SUPPLY
RESISTANCE (Ω)
1.6
1.4
MAX9650
1.0
VREF
0.8
TFT LCD
IN_+
OUT_
0.6
IN_-
0.4
UNSTABLE
0.2
0
VDD
STABLE
1.2
*C1 = 10µF
10-7
10-6
TFT-LCD
CAPACITANCE
GND
10-5
10-4
CAPACITANCE (F)
Figure 2. Minimum Combined ESR/Series/Trace Resistance
Required for Stability of the MAX9650 in Response to
Capacitive Loads
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**RS
*10µF and 0.1µF CAPACITORS AS CLOSE AS POSSIBLE TO THE PIN.
**RS MAY BE NEEDED FOR SOME APPLICATIONS.
Figure 3. Typical TFT-LCD Backplane Drive Circuit
Maxim Integrated │ 7
MAX9650/MAX9651
High-Current VCOM Drive
Op Amps for TFT LCDs
Pin Configurations
MAX9650
OUTA 1
N.C. 1
5
+
VDD
GND 2
8
N.C.
INA- 2
7
VDD
3
6
GND 4
5
INA+
INA+ 3
4
INA-
+
THIN SOT23
AMPS PER
PACKAGE
OUTA
1
+
MAX9651
8
VDD
INA- 2
7
OUTB
OUTA
INA+
3
6
INB-
N.C.
GND 4
5
INB+
µMAX-EP
(TDFN-EP)
Ordering Information
PART
MAX9650
µMAX-EP
(TDFN-EP)
Chip Information
PINPACKAGE
TOP
MARK
MAX9650AZK+
1
5 SOT23
ADSI
MAX9650AZK/V+
1
5 SOT23
ADSK
MAX9650AUA+
1
8 μMAX-EP*
AABI
MAX9650ATA+
1
8 TDFN-EP*
BKX
MAX9651AUA+
2
8 μMAX-EP*
AABH
MAX9651ATA+
2
8 TDFN-EP*
BKY
PROCESS: BiCMOS
Note: All devices are specified over the -40°C to +125°C
operating range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
*EP = Exposed pad.
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Maxim Integrated │ 8
MAX9650/MAX9651
High-Current VCOM Drive
Op Amps for TFT LCDs
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
7/08
Initial release
1
10/08
Updated slew rate and added TDFN-EP package
1, 2, 6, 10, 11
2
5/09
Updated continuous output current specification
2
3
2/10
Added automotive part to Ordering Information, corrected units for input
offset voltage, and added figure for minimum series resistance
4
7/10
Removed extraneous information in the Electrical Characteristics table and
corrected typo in TOC 5
5
11/12
Corrected lead pattern number
6
3/18
Added new Package Information tables, deleted Package Information table/
diagrams from end of data sheet, and moved Ordering Information to end of
data sheet
7
12/18
Updated Package Information table for SOT23
2
8
1/19
Updated Package Information table for SOT23
2
DESCRIPTION
—
1, 2, 5, 6
2, 4
8
1, 2, 8–12
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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