Datasheet MAX9650, MAX9651 Datasheet (MAXIM)

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)

MAX9650/MAX9651

High-Current VCOM Drive Op Amps

for TFT LCDs

________________________________________________________________

Maxim Integrated Products

1

19-4187; Rev 4; 7/10

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.

IN_+

IN_-

GND

OUT_

V

DD

TFT LCD

TFT-LCD
CAPACITANCE

16V

V

REF

*RS MAY BE NEEDED FOR SOME APPLICATIONS.

*R

S

MAX9650

Typical Operating Circuit

Ordering Information

PART

AMPS PER

PIN-

TOP MARK

MAX9650AZK+ 1 5 SOT23 ADSI

MAX9650AZK/V+

1 5 SOT23 ADSK

MAX9650AUA+ 1

AABI

MAX9650ATA+ 1

BKX

MAX9651AUA+ 2

AABH

MAX9651ATA+ 2

BKY

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.

PACKAGE

PACKAGE

8 µMAX-EP*

8 TDFN-EP*

8 µMAX-EP*

8 TDFN-EP*

MAX9650/MAX9651

High-Current VCOM Drive Op Amps
for TFT LCDs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= 19V, V

GND

= 0V, VCM= V

OUT

= VDD/2, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

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.

Supply Voltage (VDDto GND) ................................-0.3V to +22V

Any Other Pin to GND ................................-0.3V to (V

DD

+ 0.3V)

IN_+/IN_- (current)............................................................±20mA

OUT_ (current) ......................................................................1.3A

Continuous Power Dissipation (T

A

= +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

Soldering Temperature (reflow) .......................................+260°C

Supply Voltage Range V

Quiescent Current I

High Output Voltage V

Low Output Voltage V

Input Offset Voltage V

Load Regulation LR

Input Bias Current I

Voltage Gain A

Power-Supply Rejection Ratio PSRR VDD = 6V to 20V, VCM = V

Common-Mode Input Voltage
Range

Common-Mode Rejection Ratio CMRR 0.5V ≤ VCM ≤ VDD - 0.5V 60 80 dB

Continuous Output Current I

Transient Peak Output Current I

Bandwidth BW -3dB 35 MHz

Slew Rate SR 4V step, CL = 50pF, RL = 10kΩ, AV = +1V/V 40 V/µs

Settling Time t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DD

DD

OH

OL

OS

FB

V

CMVR Inferred from CMRR test 0.5

O

PK

S

Guaranteed by PSRR 6 20 V

Per channel 3.7 8 mA

IH = +5mA, VIN = V

IL = -5mA, VIN = 0V 0.05 0.30 V

TA = +25°C -14 3.5 +14

TA = -40°C to +125°C -17 +17

I

= 0mA to -80mA +0.2

OUT

I

= 0mA to +80mA -0.2

OUT

At VIN = 9.5V 0.01 1 µA

RL = 10kΩ, CL = 50pF 0.99 1.01 V/V

V

= 9.5V

OUT

(Note 2)

VDD = 15V, V

(Note 3) ±1.3 A

Settling to 0.1% of V
R

= 2.2Ω, CS = 0.1µF (Figure 1)

S

DD

= 3V 70 95 dB

OUT

MAX9650AZK+ 20

MAX9650AUA+ 80

= 7.5V MAX9650ATA+ ±350

OUT

, IL = 0 to 1000mA,

OUT

VDD -

0.30

VDD -

0.05

VDD -

0.5

2.0 µs

V

mV

mV/mA

V

mA

MAX9650/MAX9651

High-Current VCOM Drive Op Amps

for TFT LCDs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 19V, V

GND

= 0V, VCM= V

OUT

= VDD/2, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Note 1: All devices are 100% production tested at T

A

= +25°C. All temperature limits are guaranteed by design.

Note 2: Continuous output current is tested with one output at a time.
Note 3: See the

Thermal Shutdown with Temperature Hysteresis

section.

Note 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.

PARAMETER

CONDITIONS

UNITS

Maximum Load Capacitance C

LOAD

(Note 4)

nF

Noninverting Input Resistance R

IN+

(Note 5)

MΩ

Inverting Input Resistance R

IN-

(Note 5)

MΩ

Input Capacitance C

IN

3pF

Thermal Shutdown

°C

Thermal Shutdown Hysteresis 15 °C

Typical Operating Characteristics

(VDD= 19V, GND = 0, VCM= V

OUT

= VDD/2, TA= +25°C, unless otherwise specified.)

-4

-2

-3

-1

2

3

1

0

4

6 9 12 15 18 21

INPUT OFFSET VOLTAGE DEVIATION

vs. SUPPLY VOLTAGE

MAX9650 toc01

SUPPLY VOLTAGE (V)

INPUT OFFSET VOLTAGE (mV)

TA = +125°C

TA = +25°C

TA = -40°C

0

2

1

4

3

7

6

5

8

-50 0-25 25 50 75 100 125

INPUT OFFSET VOLTAGE DEVIATION

vs. TEMPERATURE

MAX9650 toc02

TEMPERATURE (°C)

INPUT OFFSET VOLTAGE (mV)

I

OUT

(500mA/div)

V

OUT

(125mV/div)

LOAD TRANSIENT

SOURCING

MAX9650 toc05

TIME (1μs/div)

0.1A RESPONSE

1A RESPONSE

0.5A RESPONSE

SYMBOL

MIN TYP MAX

150

100

100

+170

MAX9650/MAX9651

High-Current VCOM Drive Op Amps
for TFT LCDs

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VDD= 19V, GND = 0, VCM= V

OUT

= 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)

I

OUT

(500mA/div)

V

OUT

(125mV/div)

LOAD TRANSIENT

SOURCING

MAX9650 toc05

TIME (1μs/div)

0.1A RESPONSE

1A RESPONSE

0.5A RESPONSE

I

OUT

(500mA/div)

V

OUT

(125mV/div)

LOAD TRANSIENT

SINKING

MAX9650 toc06

TIME (1μs/div)

0.1A RESPONSE

1A RESPONSE

0.5A RESPONSE

100ms/div

STARTUP WAVEFORM

I

DD

10mA/div

V

DD

10V/div

V

IN

5V/div

V

OUT

5V/div

MAX9650 toc07

2μs/div

MAX9650 STEP RESPONSE

WITH VARIOUS C

L

V

OUT

5V/div

V

OUT

5V/div

V

OUT

5V/div

V

OUT

5V/div

MAX9650 toc08

CL = 10pF

CL = 2200pF

CL = 0.01μF

C

L

= 0.022μF

OPEN-LOOP GAIN AND PHASE

vs. FREQUENCY

MAX9650 toc09

FREQUENCY (Hz)

GAIN (dB)

10E+6

1E+6

10E+3

100E+31E+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 C

L

MAX9650 toc10

FREQUENCY (MHz)

VOLTAGE GAIN (dB)

1010.1

-10

-5

0

5

10

15

20

-15

0.01 100

CL = 0.1μF

CL = 0.01μF

CL = 100pF

CL = 56pF

C

L

= 10pF

CL = 560pF

CL = 0.001μF

C

L

= 0.0022μF

SMALL-SIGNAL GAIN

vs. FREQUENCY

MAX9650 toc11

FREQUENCY (Hz)

GAIN (dB)

10E+61E+6

-6

-5

-4

-3

-2

-1

0

1

2

3

-7
100E+3 100E+6

V

OUT

= 100mV

P-P

RL = 10kΩ TO VDD/2

SMALL-SIGNAL GAIN vs. FREQUENCY

WITH VARIOUS C

L

MAX9650 toc12

FREQUENCY (Hz)

GAIN (dB)

10E+61E+6

-20

-15

-10

-5

0

5

10

15

20

-25
100E+3 100E+6

10,000pF

1000pF

100pF

10pF

V

OUT

= 100mV

P-P

R

L

= 10kΩ TO VDD/2

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.

MAX9650/MAX9651

High-Current VCOM Drive Op Amps

for TFT LCDs

_______________________________________________________________________________________ 5

Pin Description

PIN

MAX9650

µMAX-EP,

MAX9651

FUNCTION

16 1

VCOM Output A

24 4

Ground

33 3

Positive Input A

42 2

Negative Input A

57 8V

DD

Positive-Supply Input. Bypass VDD to GND with a 0.1µF capacitor as close as
possible to the device.

—— 5

Positive Input B

—— 6

Negative Input B

—— 7

VCOM Output B

— 1, 5, 8 —

No Connection. Not internally connected.

—— —EP

Exposed Pad (μMAX and TDFN Only). EP is internally connected to GND. Connect EP
to GND.

IN_+

IN_-

GND

OUT_

V

DD

LCD VCOM LOAD

19V

SUPPLY

V

REF

*10μF and 0.1μF CAPACITORS AS CLOSE AS POSSIBLE TO THE PIN.
**(R

S

= R

GEN

) x C

LCD

x 6 < 2μs, WHERE R

GEN

= GENERATOR SOURCE IMPEDANCE.

MAX9650

*C2 = 0.1μF *C1 = 10μF

19V

SUPPLY

V

OUT_

C

LCD

=

0.1μF

RS =

2.2Ω

**0V TO 2.2V

AT 50kHz

Figure 1. Settling Time Test Circuit

NAME

SOT23

TDFN-EP

(µMAX-EP,

TDFN-EP)

OUTA

GND

INA+

INA-

INB+

INB-

OUTB

N.C.

MAX9650/MAX9651

High-Current VCOM Drive Op Amps
for TFT LCDs

6 _______________________________________________________________________________________

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 (V

DD

). See Figure 3. For dual-supply opera­tion, use 10µF and 0.1µF bypass capacitors on both
supplies (V

DD

and GND) with each capacitor placed as

close as possible to V

DD

and GND.

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.

IN_+

IN_-

GND

OUT_

V

DD

TFT LCD

TFT-LCD
CAPACITANCE

16V

SUPPLY

V

REF

*10μF and 0.1μF CAPACITORS AS CLOSE AS POSSIBLE TO THE PIN.
**R

S

MAY BE NEEDED FOR SOME APPLICATIONS.

**R

S

MAX9650

*C2 = 0.1μF *C1 = 10μF

19V

SUPPLY

Figure 3. Typical TFT-LCD Backplane Drive Circuit

Figure 2. Minimum Combined ESR/Series/Trace Resistance
Required for Stability of the MAX9650 in Response to
Capacitive Loads

Chip Information

PROCESS: BiCMOS

µMAX is a registered trademark of Maxim Integrated Products, Inc.

2.0

1.8

1.6

1.4

1.2

1.0

0.8

RESISTANCE (Ω)

0.6

0.4

0.2

0

UNSTABLE

-7

10

-6

10

CAPACITANCE (F)

STABLE

-5

10

-4

10

MAX9650/MAX9651

High-Current VCOM Drive Op Amps

for TFT LCDs

_______________________________________________________________________________________ 7

GND

INA-INA+

1

5V

DD

OUTA

MAX9650

THIN SOT23

2

34

OUTA

N.C.GND

1

2

87N.C.

V

DD

INA-

INA+

N.C.

μMAX-EP

(TDFN-EP)

μMAX-EP

(TDFN-EP)

3

4

6

5

MAX9650

INB-

INB+

GND

1

2

87V

DD

OUTB

INA-

INA+

OUTA

3

4

6

5

MAX9651

+

+

+

Pin Configurations

MAX9650/MAX9651

High-Current VCOM Drive Op Amps
for TFT LCDs

8 _______________________________________________________________________________________

Package Information

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.

PACKAGE TYPE PACKAGE CODE OUTLINE NO.

LAND

PATTERN NO.

5 SOT23 Z5+2

21-0113

90-0241

8 µMAX U8E+2

21-0107

90-0145

8 TDFN-EP T833+2

21-0137

90-0058

MAX9650/MAX9651

High-Current VCOM Drive Op Amps

for TFT LCDs

_______________________________________________________________________________________ 9

Package Information (continued)

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.

MAX9650/MAX9651

High-Current VCOM Drive Op Amps
for TFT LCDs

10 ______________________________________________________________________________________

8L, μMAX, EXP PAD.EPS

C

1

1

21-0107

Package Information (continued)

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.

MAX9650/MAX9651

High-Current VCOM Drive Op Amps

for TFT LCDs

______________________________________________________________________________________ 11

Package Information (continued)

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.

MAX9650/MAX9651

High-Current VCOM Drive Op Amps
for TFT LCDs

12 ______________________________________________________________________________________

COMMON DIMENSIONS

SYMBOL

MIN. MAX.

A 0.70 0.80

D 2.90 3.10

E 2.90 3.10

A1

0.00 0.05

L0.200.40

PKG. CODE

N

D2

E2 e

JEDEC SPEC

b

[(N/2)-1] x e

PACKAGE VARIATIONS

0.25 MIN.k

A2 0.20 REF.

2.00 REF0.25±0.05

0.50 BSC

2.30±0.1010

T1033-1

2.40 REF0.20±0.05- - - -

0.40 BSC

1.70±0.10 2.30±0.1014

T1433-1

1.50±0.10

MO229 / WEED-3

0.40 BSC

- - - -

0.20±0.05 2.40 REFT1433-2 14 2.30±0.101.70±0.10

T633-2

6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF

T833-2

8 1.50±0.10 2.30±0.10

0.65 BSC MO229 / WEEC

0.30±0.05 1.95 REF

T833-3

8 1.50±0.10 2.30±0.10

0.65 BSC MO229 / WEEC

0.30±0.05 1.95 REF

2.30±0.10 MO229 / WEED-3 2.00 REF0.25±0.050.50 BSC1.50±0.1010

T1033-2

0.25±0.05 2.00 REF10

0.50 BSC MO229 / WEED-3

2.30±0.101.50±0.10

T1033MK-1

0.40 BSC

- - - - 0.20±0.05 2.40 REFT1433-3F 14 2.30±0.101.70±0.10

Package Information (continued)

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.

MAX9650/MAX9651

High-Current VCOM Drive Op Amps

for TFT LCDs

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.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________

13

© 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

Revision History

REVISION

NUMBER

REVISION

DATE

DESCRIPTION

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

32/10

Added automotive part to Ordering Information, corrected units for input offset
voltage, and added figure for minimum series resistance

1, 2, 5, 6

47/10

Removed extraneous information in the Electrical Characteristics table and
corrected typo in TOC 5

2, 4