MAXIM MAX9650ATA+

19-4187; Rev 2; 5/09
High-Current VCOM Drive Op Amps
for TFT LCDs
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.
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)
Applications
Ordering Information
TFT-LCD Panels
AMPS PER
PACKAGE
PART
Instrument Control Voltage Sources
PINPACKAGE
TOP MARK
MAX9650AZK+
1
5 SOT23
ADSI
MAX9650AUA+
1
8 µMAX-EP*
AABI
MAX9650ATA+
1
8 TDFN-EP*
BKX
MAX9651AUA+
2
8 µMAX-EP*
AABH
MAX9651ATA+
2
8 TDFN-EP*
BKY
Note: All devices are specified over the -40°C to +125°C operating range.
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
16V
VDD
MAX9650
VREF
TFT LCD
IN_+
OUT_
IN_-
*RS
TFT-LCD
CAPACITANCE
GND
*RS MAY BE NEEDED FOR SOME APPLICATIONS.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
MAX9650/MAX9651
General Description
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)
5-Pin SOT23 (derate 3.7mW/°C above +70°C)........297.4mW
8-Pin µMAX-EP (derate 12.9mW/°C
above +70°C).......................................................1030.9mW
8-Pin 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
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.
ELECTRICAL CHARACTERISTICS
(VDD = 19V, VGND = 0, 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 = 0
Input Offset Voltage
VOS
MIN
3.7
VDD 0.30
TA = +25°C
-14
TA = -40°C to +125°C
-17
IFB
At VIN = 9.5V
AV
AV = 1V/V, RL = 10kΩ, CL = 50pF
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)
MAX9650AZK+
20
MAX9650AUA+
80
VDD = 15V, VOUT = 7.5V
MAX9650ATA+
V
+17
0.01
PSRR
mA
+14
0.99
Power-Supply Rejection Ratio
8
0.30
-0.2
Voltage Gain
V
3.5
+0.2
Input Bias Current
UNITS
20
0.05
IOUT = 0 to -80mA
LR
MAX
VDD 0.05
IOUT = 0 to +80mA
Load Regulation
Continuous Output Current
TYP
6
V
mV/mA
1
µA
1.01
V/V
95
dB
VDD 0.5
80
V
V
dB
mA
±350
Transient Peak Output Current
IPK
(Note 3)
±1.3
A
Bandwidth
BW
-3dB
35
MHz
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
2
_______________________________________________________________________________________
High-Current VCOM Drive Op Amps
for TFT LCDs
(VDD = 19V, VGND = 0, 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
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
3
pF
Thermal Shutdown
Thermal Shutdown Hysteresis
+170
°C
15
°C
All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Continuous output current is tested with one output at a time.
See the Thermal Shutdown with Temperature Hysteresis section.
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.
Note 1:
Note 2:
Note 3:
Note 4:
Typical Operating Characteristics
(VDD = 19V, GND = 0, VCM = VOUT = VDD/2, TA = +25°C, unless otherwise specified.)
1
0
TA = +25°C
-1
TA = -40°C
-2
6
5
4
3
2
-3
1
-4
0
6
9
12
15
SUPPLY VOLTAGE (V)
18
21
MAX9650 toc03
7
7
SUPPLY CURRENT (mA)
TA = +125°C
2
8
MAX9650 toc02
INPUT OFFSET VOLTAGE (mV)
3
8
INPUT OFFSET VOLTAGE (mV)
MAX9650 toc01
4
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
INPUT OFFSET VOLTAGE DEVIATION
vs. TEMPERATURE
INPUT OFFSET VOLTAGE DEVIATION
vs. SUPPLY VOLTAGE
6
TA = +125°C
5
4
TA = +25°C
3
TA = -40°C
2
1
0
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
6
9
12
15
18
21
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
3
MAX9650/MAX9651
ELECTRICAL CHARACTERISTICS (continued)
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)
6
MAX9650 toc06
MAX9650 toc05
MAX9650 toc04
7
SUPPLY CURRENT (mA)
LOAD TRANSIENT
SINKING
LOAD TRANSIENT
SOURCING
8
IOUT
(500mA/div)
5
4
0.1A RESPONSE
1A RESPONSE
3
VOUT
(125mA/div)
2
VOUT
(125mV/div)
0.5A RESPONSE
1
0.5A RESPONSE
1A RESPONSE
0.1A RESPONSE
0
-50
-25
0
25
50
75
100
TIME (1µs/div)
TIME (1µs/div)
MAX9650 STEP RESPONSE
WITH VARIOUS CL
OPEN-LOOP GAIN AND PHASE
vs. FREQUENCY
125
TEMPERATURE (°C)
CL = 0.01µF
VOUT
5V/div
VOUT
5V/div
3
2
1
CL = 560pF
0
CL = 10pF
GAIN (dB)
5
CL = 100pF
-10
-1
-2
-3
CL = 56pF
0.01
0.1
1
FREQUENCY (MHz)
10
100
60
PHASE
0
0
-20
-60
-40
-120
-60
-180
-240
100E+0
1E+3
100E+3
1E+6
10E+3
FREQUENCY (Hz)
15
VOUT = 100mVP-P
RL = 10kΩ TO VDD/2
10
10E+6
100E+6
10,000pF
1000pF
100pF
0
-5
-10
10pF
-15
-5
-15
120
20
5
-4
-5
180
40
20
0
CL = 0.001µF
CL = 0.1µF
VOUT = 100mVP-P
RL = 10kΩ TO VDD/2
GAIN (dB)
CL = 0.01µF
10
240
SMALL-SIGNAL GAIN vs. FREQUENCY
WITH VARIOUS CL
MAX9650 toc11
CL = 0.0022µF
300
60
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX9650 toc10
20
360
CL = 100pF
80
-80
10E+0
2µs/div
CLOSED-LOOP SMALL-SIGNAL FREQUENCY
RESPONSE FOR VARIOUS CL
MAX9650 toc09
GAIN
100
VOUT
5V/div
CL = 0.022µF
100ms/div
4
VOUT
5V/div
CL = 2200pF
VIN
5V/div
15
VOUT
5V/div
CL = 10pF
VDD
10V/div
120
-6
-20
-7
100E+3
-25
100E+3
1E+6
10E+6
FREQUENCY (Hz)
100E+6
1E+6
10E+6
FREQUENCY (Hz)
_______________________________________________________________________________________
100E+6
PHASE (DEG)
MAX9650 toc08
IDD
10mA/div
MAX9650 toc12
MAX9650 toc07
GAIN (dB)
STARTUP WAVEFORM
VOLTAGE GAIN (dB)
MAX9650/MAX9651
High-Current VCOM Drive Op Amps
for TFT LCDs
High-Current VCOM Drive Op Amps
for TFT LCDs
PIN
MAX9650
MAX9651
NAME
FUNCTION
SOT23
µMAX
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
Positive-Supply Input. Bypass VDD to GND with a 0.1µF capacitor as close as
possible to the device.
5
7
8
VDD
—
—
5
INB+
Positive Input B
—
—
6
INB-
Negative Input B
—
—
7
OUTB
—
1, 5, 8
—
N.C.
—
—
—
EP
VCOM Output B
No Connection. Not internally connected.
Exposed Pad. 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
TFT-LCD 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.
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.
19V
SUPPLY
*C2 = 0.1µF
*C1 = 10µF
19V
SUPPLY
VDD
MAX9650
VREF
LCD VCOM LOAD
IN_+
OUT_ VOUT_
IN_-
RS =
2.2Ω
CLCD =
0.1µF
**0V TO 2.2V
AT 50kHz
GND
*10µF and 0.1µF CAPACITORS AS CLOSE AS POSSIBLE TO THE PIN.
**(RS = RGEN) x CLCD x 6 < 2µs, WHERE RGEN = GENERATOR SOURCE IMPEDANCE.
Figure 1. Settling Time Test Circuit
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 power-supply pin
_______________________________________________________________________________________
5
MAX9650/MAX9651
Pin Description
MAX9650/MAX9651
High-Current VCOM Drive Op Amps
for TFT LCDs
(VDD). See Figure 2. 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.
16V
SUPPLY
*C2 = 0.1µF
*C1 = 10µF
19V
SUPPLY
Layout and Grounding
The exposed pad on the µMAX® and TDFN packages
provide 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.
VDD
MAX9650
VREF
TFT LCD
IN_+
OUT_
IN_-
**RS
TFT-LCD
CAPACITANCE
GND
Chip Information
PROCESS: BiCMOS
*10µF and 0.1µF CAPACITORS AS CLOSE AS POSSIBLE TO THE PIN.
**RS MAY BE NEEDED FOR SOME APPLICATIONS.
µMAX is a registered trademark of Maxim Integrated Products,
Inc.
Figure 2. Typical TFT-LCD Backplane Drive Circuit
Pin Configurations
+
5
VDD
GND 2
INA+ 3
4
THIN SOT23
6
8
N.C.
OUTA 1
INA- 2
7
VDD
INA+
3
6
GND 4
5
N.C. 1
MAX9650
OUTA 1
INA-
+ MAX9650
µMAX-EP
(TDFN-EP)
+
8
VDD
INA- 2
7
OUTB
OUTA
INA+
3
6
INB-
N.C.
GND 4
5
INB+
MAX9651
µMAX-EP
(TDFN-EP)
_______________________________________________________________________________________
High-Current VCOM Drive Op Amps
for TFT LCDs
PACKAGE CODE
DOCUMENT NO.
5 SOT23
Z5-2
21-0113
8 µMAX
U8E-2
21-0107
8 TDFN-EP
T833-2
21-0137
THIN SOT23.EPS
PACKAGE TYPE
_______________________________________________________________________________________
7
MAX9650/MAX9651
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX9650/MAX9651
High-Current VCOM Drive Op Amps
for TFT LCDs
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
8
_______________________________________________________________________________________
High-Current VCOM Drive Op Amps
for TFT LCDs
8L, µMAX, EXP PAD.EPS
21-0107
C
1
1
_______________________________________________________________________________________
9
MAX9650/MAX9651
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
6, 8, &10L, DFN THIN.EPS
MAX9650/MAX9651
High-Current VCOM Drive Op Amps
for TFT LCDs
10
______________________________________________________________________________________
High-Current VCOM Drive Op Amps
for TFT LCDs
COMMON DIMENSIONS
PACKAGE VARIATIONS
SYMBOL
MIN.
MAX.
PKG. CODE
N
D2
E2
e
JEDEC SPEC
b
[(N/2)-1] x e
A
0.70
0.80
T633-2
6
1.50±0.10
2.30±0.10
0.95 BSC
MO229 / WEEA
0.40±0.05
1.90 REF
D
2.90
3.10
T833-2
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
E
2.90
3.10
T833-3
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
A1
0.00
0.05
T1033-1
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
L
0.20
0.40
T1033-2
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
k
0.25 MIN.
T1433-1
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
A2
0.20 REF.
T1433-2
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
______________________________________________________________________________________
11
MAX9650/MAX9651
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX9650/MAX9651
High-Current VCOM Drive Op Amps
for TFT LCDs
Revision History
REVISION
NUMBER
REVISION
DATE
0
7/08
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
DESCRIPTION
Initial release
PAGES
CHANGED
—
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implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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