19-3174; Rev 1; 10/05
KIT
ATION
EVALU
BLE
AVAILA
Low-Cost, Linear-Regulator
LCD Panel Power Supplies
General Description
Features
♦
High-Performance Linear Regulator
1.6% Output Accuracy
Works with Small Ceramic Output Capacitors
Fast Transient Response
Foldback Current Limit
♦
50mA Negative Regulated Charge Pump
♦
20mA Positive Regulated Charge Pump with
Adjustable Delay
♦
Built-In Power-Up Sequence
♦
High-Current Operational Amplifier
(MAX8710/MAX8711/MAX8761)
±150mA Output Short-Circuit Current
12V/µs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Inputs/Output
♦
Dual-Mode™ High-Voltage Switches
(MAX8710/MAX8761)
♦
Thermal Protection
♦
Latched Fault Protection with Timer
MAX8710/MAX8711/MAX8712/MAX8761
The MAX8710/MAX8711/MAX8712/MAX8761 offer com-
plete linear-regulator power-supply solutions for thin-film
transistor (TFT) liquid-crystal-display (LCD) panels used
in LCD monitors and LCD TVs. All four devices include a
high-performance AV
DD
linear regulator, a positive
charge-pump regulator, a negative charge-pump regula-
tor, and built-in power-up sequence control. The
MAX8710/MAX8711/MAX8761 also include a high-cur-
rent operational amplifier. Additionally, the MAX8710/
MAX8761 provide logic-controlled high-voltage switches
to control the positive charge-pump output.
The linear regulator directly steps down the input voltage
to generate the supply voltage for the source-driver ICs
(AV
DD
). The two built-in charge-pump regulators
are used to generate the TFT gate-on and gate-off sup-
plies. The high-current operational amplifier is typically
used to drive the LCD backplane (VCOM) and features
high output current (150mA), fast slew rate (12V/µs), and
wide bandwidth (12MHz). Its rail-to-rail inputs and output
maximize flexibility.
The MAX8710/MAX8761 are available in a 24-pin thin
QFN package, the MAX8711 is available in a 16-pin thin
QFN package, and the MAX8712 is available in a 12-pin
thin QFN package. All three packages are 4mm x 4mm
with a maximum thickness of 0.8mm for ultra-thin LCD
panel design. The MAX8710/MAX8711/MAX8712 oper-
ate over the -40°C to +100°C temperature range and the
MAX8761 operates over the -40°C to +85°C range.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
24 Thin QFN
4mm x 4mm
16 Thin QFN
4mm x 4mm
12 Thin QFN
4mm x 4mm
24 Thin QFN
4mm x 4mm
PKG
CODE
T2444-4
T2444-4
T2444-4
T2444-4
MAX8710E
TG+ -40°C to +100°C
MAX8711E
TE+
-40°C to +100°C
MAX8712E
TC+ -40°C to +100°C
MAX8761E
TG+ -40°C to +85°C
Applications
LCD Monitor Panel Modules
LCD TV Panel Modules
+Denotes
lead-free package.
Pin Configurations
SHDN
SUPB
OUTB
Minimum Operating Circuit
IN
IN
GND
INL
TOP VIEW
18
CTL
17
16
15
14
13
REF
GND
THR
FBP
REF
OUTL
FBL
AV
DD
19
20
21
22
23
24
12
11
10
N.C.
FBN
MAX8710
FBL
MODE
DLP
FBN
SRC
DRVP
DRVN
SUPCP
OUTL
AV
DD
V
GOFF
MAX8761
VIN
SUPCP
SHDN
MAX8710
MAX8761
DRVN
DLP
POSB
AV
DD
SUPB
DRVP
9
8
7
VP
IN
VCOM
FBP
+
1
GON
2
DRN
3
REF
4
POSB
5
INL
6
NEGB
OUTB
NEGB
MODE
GON
V
GON
REF
SRC
THIN QFN 4mm x 4mm
CTL
CTL
DRN
THR
Pin Configurations continued at end of data sheet.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Cost, Linear-Regulator
LCD Panel Power Supplies
MAX8710/MAX8711/MAX8712/MAX8761
ABSOLUTE MAXIMUM RATINGS
CTL, FBL, FBP, FBN,
SHDN,
REF, THR to GND........-0.3V to +6V
MODE, DLP to GND ......................................-0.3V to V
REF
+ 0.3V
IN, INL to GND .........................................................-0.3V to +28V
SUPCP, SUPB to GND.............................................-0.3V to +14V
OUTL (MAX8710/MAX8761) ………………………-0.3V to +28V
OUTL (MAX8711/MAX8712) ………………………-0.3V to +14V
POSB, OUTB, NEGB to GND .....................-0.3V to V
SUPB
+ 0.3V
DRVN, DRVP (MAX8710/MAX8761) .......-0.3V to (V
SUPCP
- 0.3V)
DRVN, DRVP (MAX8711/MAX8712)...............-0.3V to (V
IN
- 0.3V)
SRC to GND .............................................................-0.3V to +30V
GON, DRN to GND .......................................-0.3V to V
SRC
+ 0.3V
DRN to GON .............................................................-30V to +30V
OUTB Maximum Continuous Output Current.....................±75mA
DRVP RMS Output Current...................................................90mA
DRVN RMS Output Current ...............................................-150mA
Continuous Power Dissipation (T
A
= +70°C)
24-, 16-, and 12-Pin Thin QFN 4mm x 4mm
(derate 16.9mW/°C above +70°C) ..............................1349mW
Operating Temperature Range
MAX8710/MAX8711/MAX8712 .......................-40°C to +100°C
MAX8761 ...........................................................-40°C to +85°C
Junction Temperature........................................................+150°C
Storage Temperature Range ..............................-65°C to +160°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
(Circuit of Figure 1. V
IN
= V
INL
= V
SUPCP
= 12V, V
OUTL
= V
SUPB
= 10V, V
SRC
= 27V,
T
A
= 0°C to +85°C.
Typical values are at T
A
=
+25°C, unless otherwise noted.)
PARAMETER
IN Operating Supply Range
IN Quiescent Current
Duration to Trigger Fault Condition
REF Output Voltage
SUPCP Input Supply Range
Charge-Pump Regulators Operating
Frequency
Thermal Shutdown
LINEAR REGULATOR
INL Operation Supply Range
Dropout Voltage
FBL Regulation Voltage
FBL Input Bias Current
FBL Fault Trip Level
FBL Line-Regulation Error
Bandwidth
Maximum OUTL Current
OUTL Soft-Start Period
OUTL Load Regulation
V
OUTL
< V
INL
I
OUTL
= 50mA (MAX8710/MAX8711/MAX8712)
I
OUTL
= 200mA (MAX8761)
I
OUTL
= 50mA
V
FBL
= 2.5V
Falling edge
V
INL
= V
IN
= 10.8V~13.2V, V
OUTL
= 10V,
I
OUTL
= 50mA
V
INL
= V
IN
= 10V~28V, V
OUTL
= 9V, I
OUTL
= 50mA
Guaranteed by design
V
FBL
= 2.4V (MAX8710/MAX8711/MAX8712)
V
FBL
= 2.4V (MAX8761)
2
12
oscillator clock cycles in a 7-bit DAC
V
IN
= 12V, 5mA < I
OUT
< 300mA
(MAX8710/MAX8711/MAX8712)
V
IN
= 12V, 5mA < I
OUT
< 500mA (MAX8761)
1000
300
500
2.73
2
2
10
kHz
mA
ms
%
1.92
2.00
7
150
200
2.46
2.50
28
300
400
2.54
50
2.08
15
V
mV
V
nA
V
mV
Rising temperature, 15°C hysteresis
SHDN
= GND
SHDN
= 3.3V
2
16
oscillator clock cycles
-10µA < I
REF
< 1mA (excluding internal load)
4.9
2.7
1275
1500
+160
44
5.0
5.1
13.2
1725
CONDITIONS
MIN
8
0.2
TYP
MAX
28
0.4
2.5
UNITS
V
mA
ms
V
V
kHz
°C
2
_______________________________________________________________________________________
Low-Cost, Linear-Regulator
LCD Panel Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
IN
= V
INL
= V
SUPCP
= 12V, V
OUTL
= V
SUPB
= 10V, V
SRC
= 27V,
T
A
= 0°C to +85°C.
Typical values are at T
A
=
+25°C, unless otherwise noted.)
PARAMETER
SUPB Supply Operating Range
SUPB Supply Current
Input Offset Voltage
Input Bias Current
Common-Mode Input Range
Common-Mode Rejection Ratio
Open-Loop Gain
I
OUTB
= 100µA
Output Voltage Swing High
I
OUTB
= 5mA
Output Voltage Swing Low
Short-Circuit Current
Output Current
Power-Supply Rejection Ratio
Slew Rate
-3dB Bandwidth
Gain-Bandwidth Product
FBP Regulation Voltage
FBP Line-Regulation Error
FBP Input Bias Current
DRVP p-Channel On-Resistance
DRVP n-Channel On-Resistance
FBP Fault Trip Level
Positive Charge-Pump Soft-Start
Period
FBN Regulation Voltage
FBN Input Bias Current
FBN Line Regulation
DRVN p-Channel On-Resistance
V
FBP
= 2.4V
V
FBP
= 2.6V
Falling edge
2
12
oscillator clock cycles in a 7-bit DAC
20
1.92
2.00
2.73
2.08
Buffer configuration, R
L
= 10kΩ, C
L
= 10pF
Buffer configuration, R
L
= 10kΩ, C
L
= 10pF
I
GON
= 10mA
V
OUTL
(V
SUPCP
, MAX8710/MAX8761)
= 10.8V~13.2V, V
GON
= 27V, I
GON
= 20mA
V
FBP
= 2.5V
-50
15
6
2.425
I
OUTB
= -100µA
I
OUTB
= -5mA
Short to V
SUPB
/ 2, sourcing
Short to V
SUPB
/ 2, sinking
Buffer configuration, V
POSB
= 4V,
V
OUTB
error <
±10mV
6V
≤
V
SUPB
≤
13.2V, DC (V
NEGB
, V
POSB
) = V
SUPB
/ 2
60
50
50
V
SUPB
- V
SUPB
-
150
80
2
80
150
140
±40
100
12
12
8
2.500
2.575
25
+50
30
12
15
150
mV
mA
mA
dB
V/µs
MHz
MHz
V
mV
nA
Ω
Ω
kΩ
V
ms
Buffer configuration, V
POSB
= 4V, no load
(V
NEGB
, V
POSB
) = V
SUPB
/ 2, T
A
= +25°C
(V
NEGB
, V
POSB
) = V
SUPB
/ 2
V
NEGB
, V
POSB
0
≤
(V
NEGB
, V
POSB
) < V
SUPB
-50
0
50
90
125
V
SUPB
- V
SUPB
-
15
2
mV
CONDITIONS
MIN
4.5
0.7
0
+1
TYP
MAX
13.2
1.0
12
+50
V
SUPB
UNITS
V
mA
mV
nA
V
dB
dB
MAX8710/MAX8711/MAX8712/MAX8761
OPERATIONAL AMPLIFIER (MAX8710/MAX8711/MAX8761)
POSITIVE CHARGE-PUMP REGULATOR
NEGATIVE CHARGE-PUMP REGULATOR
I
GOFF
= 10mA
V
FBN
= 250mV
V
OUTL
(V
SUPCP
, MAX8710/MAX8761)
= 10.8V~13.2V, V
VGOFF
= -6V, I
GOFF
= -50mA
7.5
200
-50
250
300
+50
25
15
mV
nA
mV
Ω
_______________________________________________________________________________________
3
Low-Cost, Linear-Regulator
LCD Panel Power Supplies
MAX8710/MAX8711/MAX8712/MAX8761
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
IN
= V
INL
= V
SUPCP
= 12V, V
OUTL
= V
SUPB
= 10V, V
SRC
= 27V,
T
A
= 0°C to +85°C.
Typical values are at T
A
=
+25°C, unless otherwise noted.)
PARAMETER
DRVN n-Channel On-Resistance
FBN Fault Trip Level
Negative Charge-Pump Soft-Start
Period
SEQUENCE CONTROL
SHDN
Input Low Voltage
SHDN
Input High Voltage
SHDN
Input Current
DLP Capacitor Charge Current
DLP Turn-On Threshold
SHDN
= low or fault tripped; DLP, FBP, FBN to GND
Pin Discharge Switch On-Resistance
SHDN
= low or fault tripped;
MODE, OUTL, OUTB to GND
MAX8710,
SHDN
= low or fault trip; GON to GND
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES (MAX8710/MAX8761)
CTL Input Low Voltage
CTL Input High Voltage
CTL Input Leakage Current
CTL to GON Rising Propagation
Delay
V
MODE
= V
REF
, 1.5nF from GON to GND, V
CTL
= 0 to
3V step, no load on GON, measured from V
CTL
= 1.5V
to GON = 20%
V
MODE
= V
REF
, 1.5nF from GON to GND, V
CTL
= 3V to
0 step, DRN falling, no load on DRN and GON,
measured from V
CTL
= 1.5V to GON = 80%
V
MODE
= V
REF
, V
DLP
= 3V, CTL = high
V
MODE
= V
REF
, V
DRN
= 8V, V
DLP
= 3V, V
CTL
= 0V
V
MODE
= V
REF
, V
DLP
= 3V, CTL = high
V
MODE
= V
REF
, V
DLP
= 3V, V
CTL
= 0V
2.0
-1
100
+1
0.6
V
V
µA
ns
During startup, V
DLP
= 1.0V
4
2.375
5
2.5
10
1
2.0
1
6
2.625
0.6
V
V
µA
µA
V
Ω
kΩ
V
FBN
= 350mV
V
FBN
= 150mV
Rising edge
2
12
oscillator clock cycles in a 7-bit DAC
20
700
2.73
CONDITIONS
MIN
TYP
3
MAX
6
UNITS
Ω
kΩ
mV
ms
CTL to GON Falling Propagation
Delay
SRC Input Voltage Range
SRC Input Current
DRN Input Current
SRC Switch On-Resistance
DRN Switch On-Resistance
MODE Switch On-Resistance
Mode 2 MODE Capacitor Charge
Current
MODE Voltage Threshold for
Enabling DRN Switch Control in
Mode 2
MODE Current-Source Stop Voltage
Threshold
THR to GON Voltage Gain
GON Falling Slew Rate
100
28
150
26
20
60
1
250
40
40
ns
V
µA
µA
Ω
Ω
kΩ
64
µA
V
MODE
< MODE current-source stop voltage threshold
42
50
2.3
2.5
2.7
V
V
MODE
rising, C
MODE
= 150pF
3.3
9.4
3.5
10
13.5
3.7
10.6
V
V/V
V/µs
4
_______________________________________________________________________________________
Low-Cost, Linear-Regulator
LCD Panel Power Supplies
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1. V
IN
= V
INL
= V
SUPCP
= 12V, V
OUTL
= V
SUPB
= 10V, V
SRC
= 27V,
T
A
= -40°C to +100°C
(-40°C to 85°C for
MAX8761), unless otherwise noted.) (Note 1)
PARAMETER
REF Output Voltage
SUPCP Input Supply Range
Charge-Pump Regulators Operating
Frequency
LINEAR REGULATOR
Dropout Voltage
FBL Regulation Voltage
FBL Fault Trip Level
FBL Line-Regulation Error
Maximum OUTL Current
I
OUTL
= 50mA (MAX8710/MAX8711/MAX8712)
I
OUTL
= 200mA (MAX8761)
I
OUTL
= 50mA
Falling edge
V
INL
= V
IN
= 10.8V~13.2V, V
OUTL
= 10V,
I
OUTL
= 50mA
V
FBL
= 2.4V (MAX8710/MAX8711/MAX8712)
V
FBL
= 2.4V (MAX8761)
V
IN
= 12V, 5mA < I
OUT
< 300mA
(MAX8710/MAX8711/MAX8712)
V
IN
= 12V, 5mA < I
OUT
< 500mA (MAX8761)
OPERATIONAL AMPLIFIER (MAX8710/MAX8711/MAX8761)
SUPB Supply Current
Input Offset Voltage
Buffer configuration, V
POSB
= 4V, no load
(V
NEGB
, V
POSB
) = V
SUPB
/ 2
I
OUTB
= 100µA
Output-Voltage-Swing High
I
OUTB
= 5mA
Output-Voltage-Swing Low
Short-Circuit Current
I
OUTB
= -100µA
I
OUTB
= -5mA
Short to V
SUPB
/ 2, sourcing
Short to V
SUPB
/ 2, sinking
MAX8710/MAX8711/MAX8712
MAX8761
50
50
2.425
2.40
2.575
2.65
25
mV
50
30
V
FBP
= 2.4V
V
FBP
= 2.6V
I
GOFF
= 10mA
V
OUTL
(V
SUPCP
, MAX8710/MAX8761)
= 10.8V~13.2V, V
GOFF
= -6V, I
GOFF
= -50mA
20
200
300
25
15
12
Ω
Ω
kΩ
mV
mV
Ω
V
SUPB
-
150
15
150
mV
mA
V
SUPB
-
15
mV
1.0
14
mA
mV
300
500
2
2
2.455
1.96
300
400
2.545
2.04
15
mV
V
V
mV
mA
CONDITIONS
-10µA < I
REF
< 1mA (excluding internal load)
MIN
4.9
2.7
1200
TYP
MAX
5.1
13.2
1850
UNITS
V
V
kHz
MAX8710/MAX8711/MAX8712/MAX8761
OUTL Load Regulation
%
POSITIVE CHARGE-PUMP REGULATOR
FBP Regulation Voltage
I
GON
= 10mA
V
FBP Line-Regulation Error
V
OUTL
(V
SUPCP
, MAX8710)
= 10.8V~13.2V, V
GON
= 27V, I
GON
= 20mA
V
OUTL
(V
SUPCP
, MAX8761)
= 10.8V ~ 13.2V, V
GON
= 27V, I
GON
= 20mA
DRVP p-Channel On-Resistance
DRVP n-Channel On-Resistance
NEGATIVE CHARGE-PUMP REGULATOR
FBN Regulation Voltage
FBN Line Regulation
DRVN p-Channel On-Resistance
_______________________________________________________________________________________
5
电子竞赛
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
