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19-4187; Rev 1; 10/08
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/s 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. 1300mA Peak Output Current Rail-to-Rail Inputs and Outputs Operates Up to 20V 40V/s Slew Rate 35MHz Bandwidth 5mA Quiescent Current per Channel Excellent Heat Dissipation (Exposed Pad)
Features
MAX9650/MAX9651
Applications
TFT-LCD Panels Instrument Control Voltage Sources
PART MAX9650AZK+ MAX9650AUA+ MAX9650ATA+ MAX9651AUA+ MAX9651ATA+
Ordering Information
AMPS PER PACKAGE 1 1 1 2 2 PINPACKAGE 5 SOT23 8 MAX-EP* 8 TDFN-EP* 8 MAX-EP* 8 TDFN-EP* TOP MARK ADSI AABI BKX AABH BKY
Note: All devices are specified over the -40C to +125C operating range. +Denotes a lead-free/RoHS-compliant package. *EP = Exposed pad.
Typical Operating Circuit
16V
VDD
MAX9650
VREF IN_+ OUT_ IN_GND *RS TFT-LCD CAPACITANCE TFT LCD
*RS MAY BE NEEDED FOR SOME APPLICATIONS.
________________________________________________________________ Maxim Integrated Products
1
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.
High-Current VCOM Drive Op Amps for TFT LCDs MAX9650/MAX9651
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 = +70C) 5-Pin SOT23 (derate 3.7 mW/C above +70C).......297.4mW 8-Pin MAX-EP (derate 12.9mW/C above +70C).......................................................1030.9mW 8-Pin TDFN-EP (derate 23.8mW/C above +70C).......................................................1951.2mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = +25C.) (Note 1)
PARAMETER Supply Voltage Range Quiescent Current High Output Voltage Low Output Voltage Input Offset Voltage Load Regulation Input Bias Current Voltage Gain Power-Supply Rejection Ratio Common-Mode Input Voltage Range Common-Mode Rejection Ratio Continuous Output Current Transient Peak Output Current Bandwidth Slew Rate Settling Time SYMBOL VDD IDD VOH VOL VOS LR IFB AV PSRR CMVR CMRR IO IPK BW SR tS Per channel IH = +5mA, VIN = VDD IL = -5mA, VIN = 0 TA = +25C TA = -40C to +125C IOUT = 0 to -80mA IOUT = 0 to +80mA At VIN = 9.5V AV = 1V/V, RL = 10k, CL = 50pF VDD = 6V to 20V, VCM = VOUT = 3V Inferred from CMRR test 0.5V VCM VDD - 0.5V VOUT = 9.5V (Note 2) (Note 3) -3dB 4V step, CL = 50pF, RL = 10k, AV = +1V/V Settling to 0.1% of VOUT, IL = 0 to 1000mA, RS = 2.2, CS = 0.1F (Figure 1) MAX9650AZK+ MAX965_AUA+ 0.99 70 0.5 60 20 80 1.3 35 40 2.0 80 95 VDD 0.5 -14 -17 +0.2 -0.2 0.01 1 1.01 VDD 0.30 CONDITIONS Guaranteed by PSRR MIN 6 3.7 VDD 0.05 0.05 3.5 0.30 +14 +17 TYP MAX 20 8 UNITS V mA V V V mV/mA A V/V dB V dB mA A MHz V/s s
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High-Current VCOM Drive Op Amps for TFT LCDs
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 19V, VGND = 0, VCM = VOUT = VDD/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Maximum Load Capacitance Noninverting Input Resistance Inverting Input Resistance Input Capacitance Thermal Shutdown Thermal Shutdown Hysteresis SYMBOL CLOAD RIN+ RINCIN (Note 4) (Note 5) (Note 5) CONDITIONS MIN TYP 150 100 100 3 +170 15 MAX UNITS nF M M pF C C
MAX9650/MAX9651
Note 1: Note 2: Note 3: Note 4:
All devices are 100% production tested at TA = +25C. 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.
Typical Operating Characteristics
(VDD = 19V, GND = 0, VCM = VOUT = VDD/2, TA = +25C, unless otherwise specified.)
INPUT OFFSET VOLTAGE DEVIATION vs. SUPPLY VOLTAGE
MAX9650 toc01
INPUT OFFSET VOLTAGE DEVIATION vs. TEMPERATURE
MAX9650 toc02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
7 SUPPLY CURRENT (mA) 6 5 4 3 2 1 0 TA = -40C TA = +25C TA = +125C
MAX9650 toc03
4 3 INPUT OFFSET VOLTAGE (mV) 2 1 0 TA = +25C -1 -2 -3 -4 6 9 12 15 18 TA = -40C TA = +125C
8 7 INPUT OFFSET VOLTAGE (mV) 6 5 4 3 2 1 0
8
21
-50
-25
0
25
50
75
100
125
6
9
12
15
18
21
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
SUPPLY VOLTAGE (V)
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High-Current VCOM Drive Op Amps for TFT LCDs MAX9650/MAX9651
Typical Operating Characteristics (continued)
(VDD = 19V, GND = 0, VCM = VOUT = VDD/2, TA = +25C, unless otherwise specified.)
SUPPLY CURRENT vs. TEMPERATURE
7 SUPPLY CURRENT (mA) 6 5 4 3 2 1 0 -50 -25 0 25 50 75 100 125 TIME (1s/div) TIME (1s/div) TEMPERATURE (C) VOUT (125mA/div) 0.5A RESPONSE 1A RESPONSE VOUT (125mV/div) 0.5A RESPONSE 0.1A RESPONSE 1A RESPONSE
MAX9650 toc04
LOAD TRANSIENT SOURCING
MAX9650 toc05
LOAD TRANSIENT SINKING
MAX9650 toc06
8
IOUT (500mA/div)
IOUT (500mA/div)
0.1A RESPONSE
STARTUP WAVEFORM
MAX9650 toc07
MAX9560 STEP RESPONSE WITH VARIOUS CL
IDD 10mA/div VDD 10V/div CL = 10pF
OPEN-LOOP GAIN AND PHASE vs. FREQUENCY
120 VOUT 5V/div VOUT 5V/div 100 80 60 GAIN (dB) 40 20 0 -20 -40 PHASE
MAX9650 toc09
MAX9650 toc08
GAIN
360 300 240 180 120 60 0 -60 -120 -180 -240 PHASE (DEG)
CL = 100pF
CL = 2200pF
VIN 5V/div VOUT 5V/div 100ms/div
CL = 0.01F
VOUT 5V/div VOUT 5V/div 2s/div
CL = 0.022F
-60 -80 10E+0 1E+3 100E+3 10E+6
100E+0
1E+6 10E+3 FREQUENCY (Hz)
100E+6
CLOSED-LOOP SMALL-SIGNAL FREQUENCY RESPONSE FOR VARIOUS CL
MAX9650 toc10
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX9650 toc11
SMALL-SIGNAL GAIN vs. FREQUENCY WITH VARIOUS CL
15 10 5 GAIN (dB) 0 -5 -10 -15 -20 10pF VOUT = 100mVP-P RL = 10k TO VDD/2 10,000pF
MAX9650 toc12
20 15 CL = 0.01F VOLTAGE GAIN (dB) 10 CL = 0.1F 5 0 -5 -10 -15 0.01 0.1 1 FREQUENCY (MHz) 10 CL = 100pF CL = 56pF CL = 0.001F CL = 560pF CL = 10pF CL = 0.0022F
3 2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 VOUT = 100mVP-P RL = 10k TO VDD/2
20
1000pF 100pF
100
-7 100E+3
1E+6
10E+6
100E+6
-25 100E+3
1E+6
10E+6
100E+6
FREQUENCY (Hz)
FREQUENCY (Hz)
4
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High-Current VCOM Drive Op Amps for TFT LCDs
Pin Description
PIN MAX9650 SOT23 1 2 3 4 5 -- -- -- -- -- MAX 6 4 3 2 7 -- -- -- 1, 5, 8 -- MAX9651 1 4 3 2 8 5 6 7 -- -- NAME OUTA GND INA+ INAVDD INB+ INBOUTB N.C. EP VCOM Output A Ground Positive Input A Negative Input A Positive-Supply Input. Bypass VDD to GND with a 0.1F capacitor as close as 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. FUNCTION
MAX9650/MAX9651
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.
19V SUPPLY *C2 = 0.1F 19V SUPPLY VDD *C1 = 10F
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 +170C, the device shuts down. When the die cools down by 15C, 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.
MAX9650
VREF IN_+ OUT_ VOUT_ IN_GND
LCD VCOM LOAD RS = 2.2 CLCD = 0.1F **0V TO 2.2V AT 50kHz
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.
*10F and 0.1F CAPACITORS AS CLOSE AS POSSIBLE TO THE PIN. **(RS = RGEN) x CLCD x 6 < 2s, WHERE RGEN = GENERATOR SOURCE IMPEDANCE.
Figure 1. Settling Time Test Circuit
Power Supplies and Bypass Capacitors
The MAX9650/MAX9651 operate from a 9V 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 10F (C1) and 0.1F (C2) power-supply bypass capacitors placed as close as possible to the power-supply pin
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High-Current VCOM Drive Op Amps for TFT LCDs MAX9650/MAX9651
(VDD). See Figure 2. For dual-supply operation, use 10F and 0.1F bypass capacitors on both supplies (VDD and GND) with each capacitor placed as close as possible to VDD and GND.
16V SUPPLY *C2 = 0.1F 19V SUPPLY VDD *C1 = 0.1F
Layout and Grounding
The exposed pad on the MAX(R) package 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.
MAX9650
VREF IN_+ OUT_ IN_GND **RS TFT-LCD CAPACITANCE TFT LCD
Chip Information
PROCESS: BiCMOS
*10F and 0.1F CAPACITORS AS CLOSE AS POSSIBLE TO THE PIN. **RS MAY BE NEEDED FOR SOME APPLICATIONS.
MAX is a registered trademark of Maxim Integrated Products, Inc.
Figure 2. Typical TFT-LCD Backplane Drive Circuit
Pin Configurations
MAX9650
OUTA 1 GND 2 INA+ 3 4 INA-
N.C. 1 5 VDD INA- 2 INA+ 3
+ MAX9650
8 7 6 5
N.C. VDD OUTA N.C.
OUTA 1 INA- 2 INA+ 3
+
MAX9651
8 7 6 5
VDD OUTB INBINB+
+
GND 4
GND 4
THIN SOT23
MAX-EP (TDFN-EP)
MAX-EP (TDFN-EP)
6
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High-Current VCOM Drive Op Amps for TFT LCDs
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 5 SOT23 8 MAX 8 TDFN-EP PACKAGE CODE Z5-2 U8E-2 T833-2 DOCUMENT NO. 21-0113 21-0107 21-0137
MAX9650/MAX9651
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THIN SOT23.EPS
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High-Current VCOM Drive Op Amps for TFT LCDs MAX9650/MAX9651
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
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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.
MAX9650/MAX9651
21-0107
C
1 1
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8L, MAX, EXP PAD.EPS
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High-Current VCOM Drive Op Amps for TFT LCDs MAX9650/MAX9651
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
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6, 8, &10L, DFN THIN.EPS
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.
MAX9650/MAX9651
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40
PACKAGE VARIATIONS PKG. CODE T633-2 T833-2 T833-3 T1033-1 T1033-2 T1433-1 T1433-2 N 6 8 8 10 10 14 14 D2 1.500.10 1.500.10 1.500.10 1.500.10 1.500.10 1.700.10 1.700.10 E2 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 2.300.10 e 0.95 BSC 0.65 BSC 0.65 BSC 0.50 BSC 0.50 BSC 0.40 BSC 0.40 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEC MO229 / WEEC MO229 / WEED-3 MO229 / WEED-3 ------b 0.400.05 0.300.05 0.300.05 0.250.05 0.250.05 0.200.05 0.200.05 [(N/2)-1] x e 1.90 REF 1.95 REF 1.95 REF 2.00 REF 2.00 REF 2.40 REF 2.40 REF
0.25 MIN. 0.20 REF.
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High-Current VCOM Drive Op Amps for TFT LCDs MAX9650/MAX9651
Revision History
REVISION NUMBER 0 1 REVISION DATE 7/08 9/08 Initial release Updated slew rate and added TDFN-EP package DESCRIPTION PAGES CHANGED -- 1, 2, 6, 10, 11
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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