DATASHEET
ISL24021
FN6637
Rev 1.00
October 18, 2011
1A Rail-to-Rail Input-Output Operational Amplifier
The ISL24021 is a high output current, high voltage, rail-to-rail
voltage feedback amplifier. The ISL24021 is capable of ±1A
peak output short circuit current. The amplifier exhibits beyond
the rail input capability, rail-to-rail output capability and is unity
gain stable.
Features
The operating supply voltage range is from 4.5V to 19V
maximum and the ISL24021 can be configured for single or
dual supply operation. The ISL24021 has the ability to quickly
source and sink large peak currents up to ±1A and to drive
large continuous currents of ±300mA.
• 18V/µs Slew Rate
The ISL24021 features fast slewing and settling times. Also, the
device provides common mode input capability beyond the
supply rails, and rail-to-rail output capability. This enables the
amplifier to offer maximum dynamic range at any supply
voltage. These features make the ISL24021 an ideal solution as
a VCOM driver in TFT-LCD panel applications. Other applications
may include battery power and portable devices, and especially
where low power consumption is important.
• Beyond the Rails Input Capability
The ISL24021 is available in a 8 Ld 3mmx3mm TDFN package
featuring a standard operational amplifier pinout with a lead
pitch of 0.65mm. The device utilizes a thermally enhanced
package and has a built-in thermal protection circuit. It is
specified for operation over an ambient temperature range of
-40°C to +85°C.
INN 2
INP 3
VSS 4
• 2.0mA Supply Current
• 25MHz -3dB Bandwidth
• ±300mA Continuous Output Current
• Unity-Gain Stable
• Rail-to-Rail Output Swing
• Built-in Thermal Protection
• -40°C to +85°C Ambient Temperature Range
• Pb-Free (RoHS Compliant)
Applications
• TFT-LCD Panels
• VCOM Driver
• Video Processing
• Audio Processing
• Test Equipment
ISL24021
(8 LD TDFN)
TOP VIEW
THERMAL
PAD
• 4.5V to 19V Maximum Supply Voltage Range
• Active Filters
Pin Configuration
NC 1
• ±1A Output Short Circuit Current
• Battery-Powered Applications
• Portable Equipment
8 NC
7 VDD
6 OUT
5 NC
THERMAL PAD IS ELECTRICALLY
ISOLATED, OR CONNECTED TO VSS
Ordering Information
PACKAGE
Tape & Reel
PKG.
PART
(Pb-Free)
DWG. #
MARKING
PART
NUMBER
(Notes 1, 2, 3)
LEAD
PITCH
(mm)
ISL24021IRT065Z-T7A
0.65
P021
8 Ld TDFN
L8.3x3K
ISL24021IRT065Z-T13
0.65
P021
8 Ld TDFN
L8.3x3K
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pbfree material sets, molding compounds/die attach materials, and
100% matte tin plate plus anneal (e3 termination finish, which is
RoHS compliant and compatible with both SnPb and Pb-free
soldering operations). Intersil Pb-free products are MSL classified
at Pb-free peak reflow temperatures that meet or exceed the Pbfree requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information
page for ISL24021. For more information on MSL please see
techbrief TB363.
FN6637 Rev 1.00
October 18, 2011
Page 1 of 13
ISL24021
Absolute Maximum Ratings (TA = +25°C)
Thermal Information
Supply Voltage Range (VDD -VSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.8V
Input Voltage Range (INN, INP). . . . . . . . . . . . . . . . . VSS - 0.5V, VDD + 0.5V
Input Differential Voltage (INP - INN) . . . . . . . . . .(VDD + 0.5V) - (VSS - 0.5V)
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7500V
Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1500V
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
8 Ld TDFN Package (Notes 4, 5). . . . . . . . .
50
17
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Ambient Operating Temperature . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see Figure 28
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
5. For JC, the "case temp" location is the center of the ceramic on the package underside.
Electrical Specifications
PARAMETER
VDD = 5V, VSS = -5V, RL = 1k to 0V, TA = +25°C, Unless Otherwise Specified.
DESCRIPTION
CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 6)
UNIT
19
V
2.8
mA
POWER SUPPLY PERFORMANCE
VDD - VSS
Supply Voltage Range
4.5
IS
Supply Current
No load
PSRR
Power Supply Rejection Ratio
VS is moved from ±2.25V to ±9.5V
2.1
60
80
dB
INPUT CHARACTERISTICS
VOS
Input Offset Voltage
TCVOS
Average Offset Voltage Drift (Note 7)
ILEAK
Input Leakage Current
VCM = 0V
1.4
VCM = 0V
2
15
1
mV
µV/°C
10
nA
RIN
Input Resistance
1
G
CIN
Input Capacitance
2
pF
CMIR
Common-Mode Input Range
VSS0.5
VDD+
0.5
V
CMRR
Common-Mode Rejection Ratio
For VIN from -5.5V to 5.5V
50
70
dB
AVOL
Open-Loop Gain
-4.5V VOUT 4.5V
75
100
dB
VDD0.15
VDD0.025
V
OUTPUT CHARACTERISTICS
VOH
Output Swing High
IL= 5mA, VIN = VDD
VOL
Output Swing Low
IL= -5mA,VIN = VSS
ISC
Short-Circuit Current
±1.0
A
IOUT
Continuous Output Current (Note 10)
±300
mA
18
V/µs
VSS+
0.025
VSS+
0.15
V
DYNAMIC PERFORMANCE
Slew Rate (Note 8)
-4.0V VOUT 4.0V
tS
Settling to 0.1% (Note 9)
AV = +1, VO = 2V step
80
ns
BW
-3dB Bandwidth
AV = +1, RL = 1kCL= 8pF
25
MHz
PM
Phase Margin
RL = 1kCL= 8pF
44
°
SR
THERMAL PERFORMANCE
TTS
Thermal Shutdown Temperature
Die temperature at which the device will
shutdown until it cools by TTSH °C
+165
°C
TTSH
Thermal Shutdown Hysteresis
Die temperature below TTS °C when the
device will become operational after
shutdown
15
°C
FN6637 Rev 1.00
October 18, 2011
Page 2 of 13
ISL24021
.
Electrical Specifications
PARAMETER
VDD = 5V, VSS = GND = 0V, RL = 1kto 2.5V, TA = +25°C, Unless Otherwise Specified.
DESCRIPTION
CONDITION
MIN
(Note 6)
TYP
MAX
(Note 6)
UNIT
19
V
2.8
mA
POWER SUPPLY PERFORMANCE
VDD - VSS
Supply Voltage Range
4.5
IS
Supply Current
No load
PSRR
Power Supply Rejection Ratio
VS is moved from +4.5V to +19V
2.0
60
80
dB
INPUT CHARACTERISTICS
VOS
Input Offset Voltage
VCM = 2.5V
1.4
15
TCVOS
Average Offset Voltage Drift (Note 7)
ILEAK
Input Leakage Current
RIN
Input Resistance
1
G
CIN
Input Capacitance
2
pF
CMIR
Common-Mode Input Range
CMRR
Common-Mode Rejection Ratio
For VIN from -0.5V to 5.5V
45
70
dB
AVOL
Open-Loop Gain
0.5V VOUT 4.5V
70
100
dB
VDD0.15
VDD0.025
V
1
VCM = 2.5V
mV
µV/°C
2
10
VSS0.5
VDD+
0.5
nA
V
OUTPUT CHARACTERISTICS
VOH
Output Swing High
IL= 5mA, VIN = VDD
VOL
Output Swing Low
IL= -5mA,VIN = VSS
ISC
Short-Circuit Current
±0.5
A
IOUT
Continuous Output Current (Note 10)
±300
mA
VSS+
0.025
VSS+
0.15
V
DYNAMIC PERFORMANCE
SR
Slew Rate (Note 8)
1V VOUT 4V
15
V/µs
tS
Settling to 0.1% (Note 9)
AV = +1, VO = 2V step
80
ns
BW
-3dB Bandwidth
AV = +1, RL = 1kCL= 8pF
22
MHz
PM
Phase Margin
RL = 1kCL= 8pF
46
°
THERMAL PERFORMANCE
TTS
Thermal Shutdown Temperature
Die temperature at which the device will
shutdown until it cools by TTSH °C
+165
°C
TTSH
Thermal Shutdown Hysteresis
Die temperature below TTS °C when the
device will become operational after
shutdown
15
°C
Electrical Specifications
PARAMETER
VDD = 15V, VSS = GND = 0V, RL = 1k to 7.5V, TA = +25°C, Unless Otherwise Specified.
DESCRIPTION
CONDITION
MIN
(Note 6)
TYP
MAX
(Note 6)
UNIT
19
V
2.8
mA
POWER SUPPLY PERFORMANCE
VDD - VSS
Supply Voltage Range
4.5
IS
Supply Current
No load
PSRR
Power Supply Rejection Ratio
VS is moved from +4.5V to +19V
2.2
60
80
dB
INPUT CHARACTERISTICS
VOS
Input Offset Voltage
TCVOS
Average Offset Voltage Drift (Note 7)
FN6637 Rev 1.00
October 18, 2011
VCM = 7.5V
1.4
1
15
mV
µV/°C
Page 3 of 13
ISL24021
Electrical Specifications
PARAMETER
VDD = 15V, VSS = GND = 0V, RL = 1k to 7.5V, TA = +25°C, Unless Otherwise Specified. (Continued)
DESCRIPTION
CONDITION
MIN
(Note 6)
VCM = 7.5V
TYP
MAX
(Note 6)
UNIT
2
10
nA
ILEAK
Input Leakage Current
RIN
Input Resistance
1
G
CIN
Input Capacitance
2
pF
CMIR
Common-Mode Input Range
CMRR
Common-Mode Rejection Ratio
For VIN from -0.5V to 15.5V
50
70
dB
AVOL
Open-Loop Gain
0.5V VOUT 14.5V
75
95
dB
VDD 0.4
V
VDD 0.025
V
IL= -100mA,VIN = VSS
VSS +
0.4
V
IL= -7.5mA,VIN = VSS
VSS +
0.025
VSS0.5
VDD+
0.5
V
OUTPUT CHARACTERISTICS
VOH
Output Swing High
IL= 100mA, VIN = VDD
IL= 7.5mA, VIN = VDD
Output Swing Low
VOL
VDD 0.15
VSS +
0.15
V
ISC
Short-Circuit Current
±1.0
A
IOUT
Continuous Output Current (Note 10)
±300
mA
DYNAMIC PERFORMANCE
SR
Slew Rate (Note 8)
1V VOUT 14V
19
V/µs
tS
Settling to 0.1% (Note 9)
AV = +1, VO = 2V step
80
ns
BW
-3dB Bandwidth
AV = +1, RL = 1kCL= 8pF
27
MHz
PM
Phase Margin
RL = 1kCL= 8pF
42
°
THERMAL PERFORMANCE
TTS
Thermal Shutdown Temperature
Die temperature at which the device will
shutdown until it cools by TTSH °C
+165
°C
TTSH
Thermal Shutdown Hysteresis
Die temperature below TTS °C when the
device will become operational after
shutdown
15
°C
NOTES:
6. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
7. Measured over the -40°C to +85°C ambient operating temperature range.
8. Typical slew rate is an average of the slew rates measured on the rising (20% to 80%) and the falling (80% to 20%) edges of the output signal.
9. Settling time measured from [Full Scale - (0.1%*StepSize)] on the rising edge to when the output is bounded within ±0.1% of full scale.
10. Continuous output current with a typical of ±300mA. Care should be taken to ensure the maximum package power dissipation is not exceeded, refer
to “Power Dissipation” on page 10.
Pin Descriptions
PIN NUMBER
PIN NAME
1, 5, 8
NC
2
INN
PIN TYPE
PIN FUNCTION
No Connection
Analog Input
Amplifier negative input
3
INP
Analog Input
Amplifier positive input
4
VSS
Analog Power
Negative power supply (connect to GND for single supply operation)
6
OUT
Analog Output
Amplifier output
7
VDD
Analog Power
Positive power supply
FN6637 Rev 1.00
October 18, 2011
Page 4 of 13
ISL24021
Typical Performance Curves
1.0
450
VS = ±5V
400
TA = +25°C
TYPICAL
PRODUCTION
DISTRIBUTION
INPUT OFFSET VOLTAGE (mV)
NUMBER OF DEVICES
500
350
300
250
200
150
100
50
0
-6
-4
-2
0
2
4
VS = ±5V
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-50
6
0
50
TEMPERATURE (°C)
INPUT OFFSET VOLTAGE (mV)
FIGURE 1. INPUT OFFSET VOLTAGE DISTRIBUTION
4.972
1.5
OUTPUT HIGH VOLTAGE (V)
INPUT LEAKAGE CURRENT (nA)
VS = ±5V
AV = 1
RL = 1k
VS = ±5V
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-50
0
50
100
4.970
4.968
4.966
4.964
4.962
4.960
-50
150
0
50
100
150
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 3. INPUT LEAKAGE CURRENT vs TEMPERATURE
FIGURE 4. OUTPUT HIGH VOLTAGE vs TEMPERATURE
120
-4.980
VS = ±5V
VS = ±5V
AV = 1
RL = 1k
OPEN LOOP GAIN (dB)
OUTPUT LOW VOLTAGE (V)
150
FIGURE 2. INPUT OFFSET VOLTAGE vs TEMPERATURE
2.0
-4.982
100
-4.984
-4.986
-4.988
-4.990
-4.992
-50
0
50
100
TEMPERATURE (°C)
FIGURE 5. OUTPUT LOW VOLTAGE vs TEMPERATURE
FN6637 Rev 1.00
October 18, 2011
150
110
100
90
80
70
-50
0
50
100
TEMPERATURE (°C)
FIGURE 6. OPEN-LOOP GAIN vs TEMPERATURE
Page 5 of 13
150
ISL24021
Typical Performance Curves (Continued)
100
100
VS = ±5V
VS = ±5V
90
90
CMRR (dB)
PSRR (dB)
95
85
80
70
60
75
70
80
-50
0
50
TEMPERATURE (°C)
100
50
-50
150
0
50
TEMPERATURE (°C)
100
FIGURE 8. CMRR vs TEMPERATURE
FIGURE 7. PSRR vs TEMPERATURE
22
2.6
VS = ±5V
SUPPLY CURRENT (mA)
SLEW RATE (V/µs)
VS = ±5V
AV = 2
20
18
16
14
-50
0
50
100
2.4
2.2
2.0
1.8
1.6
-50
150
0
TEMPERATURE (°C)
150
4.0
TA = +25°C
TA = +25°C
3.5
SUPPLY CURRENT (mA)
120
GAIN (dB)
100
FIGURE 10. SUPPLY CURRENT vs TEMPERATURE
140
100
80
60
RL = OPEN
3.0
2.5
2.0
1.5
1.0
0.5
8
12
SUPPLY VOLTAGE (V)
16
FIGURE 11. OPEN-LOOP GAIN vs SUPPLY VOLTAGE
FN6637 Rev 1.00
October 18, 2011
50
TEMPERATURE (°C)
FIGURE 9. SLEW RATE vs TEMPERATURE
40
4
150
20
4
8
12
16
20
SUPPLY VOLTAGE (V)
FIGURE 12. SUPPLY CURRENT vs SUPPLY VOLTAGE
Page 6 of 13
ISL24021
Typical Performance Curves (Continued)
4
10
VS = ±5V
3 AV = 1
1k
0
-1
AV = 1
47pF
0
-2
-6
150
-4
-8
-5
100k
1M
10M
FREQUENCY (Hz)
-10
100k
100M
4
VS = ±5V
3
AV = 1
1M
10M
FREQUENCY (Hz)
100M
FIGURE 14. FREQUENCY RESPONSE FOR VARIOUS CL
FIGURE 13. FREQUENCY RESPONSE FOR VARIOUS RL
120
180
100
160
GAIN (dB)
80
2
0
GAIN (dB)
1
0.1%
-1
140
60
120
40
100
20
80
0
60
PHASE (°)
-2
-20
-3
-40
20
-4
VS = ±5V
-60
-80
10
TA = +25°C
0
-5
50
60
70
80
90
SETTLING TIME (ns)
100
110
40
10
VS = ±5V
0
RL = 1k
-10
-40
-50
-60
100k
1M
10M
-20
100M
VS = ±5V
RL = 1k
-30
PSRR-
-40
-50
-60
-70
-70
-80
-90
100
10k
-20
PSRR (dB)
-30
1k
FIGURE 16. OPEN LOOP GAIN AND PHASE
-10
-20
100
FREQUENCY (Hz)
FIGURE 15. STEP SIZE vs SETTLING TIME
CMRR (dB)
10pF
100pF
-4
-3
STEP SIZE (V)
6
2
-2
5
VS = ±5V
4
560
1
GAIN (dB)
GAIN (dB)
2
8
PHASE(°)
5
PSRR+
-80
1k
10k
100k
1M
FREQUENCY (Hz)
FIGURE 17. CMRR vs FREQUENCY
FN6637 Rev 1.00
October 18, 2011
10M
100M
-90
100
1k
10k
100k
1M
FREQUENCY (Hz)
10M
100M
FIGURE 18. PSRR vs FREQUENCY
Page 7 of 13
ISL24021
Typical Performance Curves (Continued)
VS = ±5V
VOLTAGE NOISE (nV/Hz)
1000
AV = 1
100
10
6V STEP
200ns/DIV
1
10
100
1k
10k
100k
FREQUENCY (Hz)
1M
10M
100M
FIGURE 20. LARGE SIGNAL TRANSIENT RESPONSE
FIGURE 19. INPUT VOLTAGE NOISE SPECTRAL DENSITY
VS = ±5V
AV = 1
INN
VDD
INP
200mV STEP
200ns/DIV
ISL24021
4.7µF
0.1µF
VSS
4.7µF
OUT
RL
0.1µF
CL
THERMAL PAD
CONNECTED TO VSS
FIGURE 21. SMALL SIGNAL TRANSIENT RESPONSE
FN6637 Rev 1.00
October 18, 2011
FIGURE 22. TEST CIRCUIT
Page 8 of 13
ISL24021
Applications Information
VS = ±2.5V, TA = +25°C, AV = 1, VIN = 6VP-P
Product Description
1V
10µs
The ISL24021 is a high output current, high voltage, rail-to-rail
voltage feedback amplifier. The ISL24021 is capable of ±1A
peak output short circuit current. The amplifier exhibits beyond
the rail input capability, rail-to-rail output capability and is unity
gain stable. Other features include fast slew rate and settling
time which is important in many applications, such as TFT-LCD
panels.
Operating Voltage, Input and Output
Capability
1V
FIGURE 23. OPERATION WITH BEYOND-THE-RAILS INPUT
.
VS = ±5V, TA = +25°C, AV = 1, VIN = 10VP-P
5V
10µs
The input common mode voltage range extends 0.5V beyond the
supply rails. For this range, the ISL24021 amplifier is immune to
phase reversal. If the common mode input voltage exceeds the
supply voltage by more than 0.5V, electrostatic protection diodes
in the input stage of the device begin to conduct. It is suggested
to not overdrive the inputs. Figure 23 shows the input voltage
driven beyond the supply rails and the device output swinging
between the supply rails.
The output swings of the ISL24021 typically extend to within
25mV of positive and negative supply rails with load currents of
±5mA. Decreasing load currents will extend the output voltage
range even closer to the supply rails. Figure 24 shows the input
and output waveforms for the device in a unity-gain
configuration. Operation is from ±5V supply with a 1k load
connected to GND. The input is a 10VP-P sinusoid and the output
voltage is approximately 9.95VP-P.
Refer to the “Electrical Specifications” tables beginning on
page 2 for specific device parameters. Parameter variations with
operating voltage, loading and/or temperature are shown in the
“Typical Performance Curves” on page 5.
INPUT
The ISL24021 can operate on a single supply or dual supply
configuration. The ISL24021 operating voltage ranges from a
minimum of 4.5V to a maximum of 19V. This range allows for a
standard 5V (or ±2.5V) supply voltage to dip to -10%, or a
standard 18V (or ±9V) to rise by +5.5% without affecting
performance or reliability.
5V
OUTPUT
The ISL24021 is available in a 8 Ld 3mmx3mm TDFN package
featuring a standard operational amplifier pinout and a lead pitch
of 0.65mm. The device utilizes a thermally enhanced package and
has a built-in thermal protection circuit. It is specified for operation
over an ambient temperature range of -40°C to +85°C.
FIGURE 24. OPERATION WITH RAIL-TO-RAIL INPUT AND OUTPUT
Output Current Limit
The ISL24021 is capable of ±1A peak output short circuit
current. The device will limit the current to ±1A. Maximum
reliability is maintained if the output continuous current never
exceeds ±300mA. This limit is set by the characteristics of the
internal metal interconnects. See “Power Dissipation” on
page 10 for detailed information about ensuring device
operation with temperature and load conditions.
Driving Capacitive Loads
As load capacitance increases, the -3dB bandwidth will decrease
and peaking can occur. Depending on the application, it may be
necessary to reduce peaking and to improve device stability. To
improve device stability a snubber circuit or a series resistor may
be added to the output of the ISL24021.
A snubber is a shunt load consisting of a resistor in series with a
capacitor, see Figure 25. An optimized snubber can improve the
phase margin and the stability of the ISL24021. The advantage
of a snubber circuit is that it does not draw any DC load current or
reduce the gain.
Another method to reduce peaking is to add a series output
resistor (typically between 1 to 10; see Figure 26). Depending
on the capacitive loading, a small value resistor may be the most
appropriate choice to minimize any reduction in gain.
FN6637 Rev 1.00
October 18, 2011
Page 9 of 13
ISL24021
Power Dissipation
.
INN
VDD
INP
ISL24021
4.7µF
0.1µF
VSS
OUT
RSNUBBER
4.7µF
0.1µF
The ISL24021 has a built-in thermal protection, which
automatically shuts the output OFF (high impedance) when the
die temperature reaches +165°C. This ensures safe operation
and prevents internal damage to the device. When the die cools
by +15°C the output will automatically turn ON.
ZL
THERMAL PAD
CONNECTED TO VSS
With a 300mA maximum continuous output drive capability, it is
possible to exceed the rated +150°C maximum junction
temperature. It is important to calculate the maximum power
dissipation of the ISL24021 for the application. Proper load
conditions will ensure that the ISL24021 junction temperature
stays within a safe operating region.
CSNUBBER
FIGURE 25. OUTPUT SNUBBER CIRCUIT
.
The maximum power dissipation allowed in a package is
determined according to Equation 1:
INN
VDD
INP
4.7µF
0.1µF
ISL24021
T JMAX – T AMAX
P DMAX = --------------------------------------- JA
(EQ. 1)
where:
VSS
OUT
RSERIES
4.7µF
0.1µF
• TAMAX = Maximum ambient temperature
ZL
THERMAL PAD
CONNECTED TO VSS
• JA = Thermal resistance of the package
• PDMAX = Maximum power dissipation in the package
FIGURE 26. OUTPUT SERIES RESISTOR CIRCUIT
Typical Application Circuit
A typical application of the ISL24021 is as a TFT-LCD VCOM driver
(see Figure 27). A VCOM driver maintains the backplane common
voltage of a TFT-LCD panel. Maintaining the VCOM voltage at a
steady level is critical to panel performance. The ability of the
ISL24021 to source/sink large peak short circuit currents make
it ideal as a VCOM driver. The ±1A short circuit current capability
combined with a large bandwidth and fast settling time give the
ISL24021 ideal VCOM driver characteristics, and make it a great
choice for TFT-LCD applications.
V DD = 15V
VCOM
CALIBRATOR /
RESISTOR
LADDER
ISL24021
INN
INP
0.1µF
TFT-LCD
+
OUT
V SS
THERMAL PAD CONNECTED
TO V SS
PANEL
CAPACITANCE
+
C STORAGE
Sourcing:
P DMAX = V S I S + V DD – V OUT I LOAD
(EQ. 2)
Sinking:
(EQ. 3)
P DMAX = V S I S + V OUT – V SS I LOAD
• VS = Total supply voltage range (VDD - VSS)
• VDD = Positive supply voltage
• VSS = Negative supply voltage
• VOUT = Output voltage
• ILOAD = Load current
NOTE: C STORAGE WILL VARY
DEPENDING ON THE
APPLICATION
FIGURE 27. TYPICAL APPLICATION CIRCUIT: TFT-LCD VCOM
FN6637 Rev 1.00
October 18, 2011
The actual maximum power dissipation of the IC is the total
quiescent supply current, times the total power supply voltage,
plus the power dissipation in the IC caused by the loading
condition.
• IS = Device supply current
4.7µF
-
0.1µF
• TJMAX = Maximum junction temperature
Device overheating can be avoided by calculating the minimum
resistive load condition, RLOAD, resulting in the highest power
dissipation. To find RLOAD, set the two PDMAX equations equal to
each other and solve for VOUT/ILOAD. Reference the package
power dissipation curve, Figure 28, for further information.
Page 10 of 13
ISL24021
Printed Circuit Board Layout
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY (4-LAYER) TEST BOARD - TDFN
EXPOSED DIEPAD SOLDERED TO PCB PER JESD51-5
3.0
As with any high-frequency device, good printed circuit board
layout is necessary for optimum performance. For the ISL24021
low impedance analog power and ground planes are
recommended, and trace lengths should be as short as possible.
The power supply pins must be well bypassed to reduce the risk
of oscillation. For optimal thermal and operating performance
the ISL24021 thermal pad should always be connected to the
lowest potential, VSS.
POWER DISSIPATION (W)
2.5W
2.5
TDFN8
2.0
JA = +50 (°C/W)
1.5
1.0
0.5
0
0
25
50
75
100
125
AMBIENT TEMP (°C)
150
For normal single supply operation (the VSS pin is connected to
GND) a 4.7µF capacitor should be placed from VDD to GND, then
a parallel 0.1µF capacitor should be connected as close to the
amplifier as possible. For dual supply operation the same
bypassing techniques should be utilized by connecting capacitors
from each supply to GND.
FIGURE 28. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
FN6637 Rev 1.00
October 18, 2011
Page 11 of 13
ISL24021
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make
sure you have the latest revision.
DATE
REVISION
CHANGE
9/14/2011
FN6637.1
Updated Ordering Information by Removing bulk part ISL24021IRT065Z, added T7A part, PKG DWG# changed
from L8.3x3A to L8.3x3K, added MSL Note
Changed Human Body Model from "3000V" to "7500V"
Added to Abs Max Rating - Charged Device Model
Updated Tja Note to Non direct attached at High Thermal conductivity
Added to Thermal Information Tjc "17" and respective note.
Electrical Spec Table - Updated Note from: Parameters with MIN and/or MAX limits are 100% tested at +25°C,
unless otherwise specified. Temperature limits established by characterization and are not production tested.
To: Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or
design.
Changed POD L8.3x3A to L8.3x3K.
06/03/2009
FN6637.0
Initial Release
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products
address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks.
Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a
complete list of Intersil product families.
For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on
intersil.com: ISL24021
To report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff
FITs are available from our website at: http://rel.intersil.com/reports/search.php
© Copyright Intersil Americas LLC 2009-2011. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN6637 Rev 1.00
October 18, 2011
Page 12 of 13
ISL24021
Package Outline Drawing
L8.3x3K
8 LEAD DUAL FLAT NO-LEAD PLASTIC PACKAGE
Rev 0, 7/11
2X 1.95
3.00
6X 0.65
A
B
1
PIN #1
INDEX AREA
3.00
6
6
PIN 1
INDEX AREA
(4X)
1.50 ±0.10
0.15
8
TOP VIEW
8X 0.25 ±0.05
0.40 ± 0.05
4
0.10 M C A B
2.30 ±0.10
BOTTOM VIEW
SEE DETAIL "X"
C
0.10 C
0.75 ±0.05
0 . 203 REF
5
C
0 . 02 NOM.
0 . 05 MAX.
0.08 C
SIDE VIEW
DETAIL "X"
( 2.30)
( 1.95)
NOTES:
( 8X 0.50)
1.
Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2.
Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3.
Unless otherwise specified, tolerance : Decimal ± 0.05
4.
Dimension applies to the metallized terminal and is measured
(1.50)
( 2.90 )
between 0.15mm and 0.20mm from the terminal tip.
PIN 1
5.
Tiebar shown (if present) is a non-functional feature.
6.
The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
(6x 0.65)
( 8 X 0.25)
either a mold or mark feature.
TYPICAL RECOMMENDED LAND PATTERN
7.
FN6637 Rev 1.00
October 18, 2011
Compliant to JEDEC MO-229 WEEC-2 except for the foot length.
Page 13 of 13
工商网监
湘ICP备2023018690号
