MAXIM MAX9650, MAX9651 Technical data

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