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PDF MAX8710 Data sheet ( Hoja de datos )
| Número de pieza | MAX8710 | |
| Descripción | Low-Cost Linear-Regulator LCD Panel Power Supplies | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3174; Rev 1; 10/05
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
Low-Cost, Linear-Regulator
LCD Panel Power Supplies
General Description
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 AVDD 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
(AVDD). 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.
Applications
LCD Monitor Panel Modules
LCD TV Panel Modules
Pin Configurations
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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
MAX8710ETG+
-40°C to +100°C
24 Thin QFN
4mm x 4mm
T2444-4
MAX8711ETE+
-40°C to +100°C
16 Thin QFN
4mm x 4mm
T2444-4
MAX8712ETC+
-40°C to +100°C
12 Thin QFN
4mm x 4mm
T2444-4
MAX8761ETG+ -40°C to +85°C
24 Thin QFN
4mm x 4mm
T2444-4
+Denotes lead-free package.
Minimum Operating Circuit
IN
TOP VIEW
18 17 16 15 14 13
CTL 19
FBL 20
MODE 21
DLP 22
FBN 23
SRC 24
+
MAX8710
MAX8761
123 4 56
12 N.C.
11 DRVP
10 DRVN
9 SUPCP
8 OUTL
7 IN
THIN QFN 4mm x 4mm
Pin Configurations continued at end of data sheet.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
REF
VGOFF
AVDD
VCOM
CTL
IN
GND
INL
REF OUTL
FBL
FBN MAX8710
MAX8761
VIN
SUPCP
SHDN
DRVN
DLP
DRVP
POSB
AVDD SUPB
FBP
OUTB
NEGB
MODE
CTL
SRC
GON
DRN
THR
AVDD
VP
VGON
REF
________________________________________________________________ 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.
1 page  
www.DataSheet4U.com
Low-Cost, Linear-Regulator
LCD Panel Power Supplies
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1. VIN = VINL = VSUPCP = 12V, VOUTL = VSUPB = 10V, VSRC = 27V, TA = -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
CONDITIONS
-10µA < IREF < 1mA (excluding internal load)
MIN TYP MAX UNITS
4.9 5.1 V
2.7
13.2
V
Charge-Pump Regulators Operating
Frequency
1200
1850
kHz
LINEAR REGULATOR
Dropout Voltage
FBL Regulation Voltage
FBL Fault Trip Level
IOUTL = 50mA (MAX8710/MAX8711/MAX8712)
IOUTL = 200mA (MAX8761)
IOUTL = 50mA
Falling edge
2.455
1.96
300
400
2.545
2.04
mV
V
V
FBL Line-Regulation Error
VINL = VIN = 10.8V~13.2V, VOUTL = 10V,
IOUTL = 50mA
Maximum OUTL Current
VFBL = 2.4V (MAX8710/MAX8711/MAX8712)
VFBL = 2.4V (MAX8761)
OUTL Load Regulation
VIN = 12V, 5mA < IOUT < 300mA
(MAX8710/MAX8711/MAX8712)
VIN = 12V, 5mA < IOUT < 500mA (MAX8761)
OPERATIONAL AMPLIFIER (MAX8710/MAX8711/MAX8761)
SUPB Supply Current
Buffer configuration, VPOSB = 4V, no load
Input Offset Voltage
(VNEGB, VPOSB) = VSUPB / 2
Output-Voltage-Swing High
IOUTB = 100µA
IOUTB = 5mA
300
500
VSUPB -
15
VSUPB -
150
15 mV
mA
2
%
2
1.0 mA
14 mV
mV
Output-Voltage-Swing Low
IOUTB = -100µA
IOUTB = -5mA
Short-Circuit Current
Short to VSUPB / 2, sourcing
Short to VSUPB / 2, sinking
POSITIVE CHARGE-PUMP REGULATOR
FBP Regulation Voltage
IGON = 10mA
MAX8710/MAX8711/MAX8712
MAX8761
50
50
2.425
2.40
15
mV
150
mA
2.575
2.65
V
FBP Line-Regulation Error
VOUTL (VSUPCP, MAX8710)
= 10.8V~13.2V, VGON = 27V, IGON = 20mA
VOUTL (VSUPCP, MAX8761)
= 10.8V ~ 13.2V, VGON = 27V, IGON = 20mA
DRVP p-Channel On-Resistance
DRVP n-Channel On-Resistance
VFBP = 2.4V
VFBP = 2.6V
NEGATIVE CHARGE-PUMP REGULATOR
FBN Regulation Voltage
IGOFF = 10mA
FBN Line Regulation
VOUTL (VSUPCP, MAX8710/MAX8761)
= 10.8V~13.2V, VGOFF = -6V, IGOFF = -50mA
DRVN p-Channel On-Resistance
20
200
25
mV
50
30 Ω
12 Ω
kΩ
300 mV
25 mV
15 Ω
_______________________________________________________________________________________ 5
5 Page 
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Low-Cost, Linear-Regulator
LCD Panel Power Supplies
Pin Description (continued)
MAX8710/
MAX8761
PIN
MAX8711
MAX8712
18 13 9
19 — —
20 14 10
21 — —
22 15 11
23 16 12
24 — —
NAME
FUNCTION
SHDN
CTL
FBL
Active-Low Shutdown Control Input. Pull SHDN low to turn off all sections of the
device except REF. Pull SHDN high to enable the device. Cycle SHDN to reset
the device after a fault.
High-Voltage Switch-Control Block Timing Control Input. See the Switch Control
(MAX8710/MAX8761) section for details.
Linear-Regulator Feedback Input. Connect FBL to the center of a resistive
voltage-divider between the linear-regulator output and GND to set the linear-
regulator output voltage. Place the divider within 5mm of FBL.
MODE
DLP
FBN
SRC
High-Voltage Switch-Control Block-Mode Selection Input and Timing-Adjustment
Input. See the Switch Control (MAX8710/MAX8761) section for details. MODE is
high impedance when it is connected to REF. MODE is internally pulled to GND
by a 1kΩ resistor during REF UVLO, when VDLP < 2.5V, or in shutdown.
Positive Charge-Pump Startup Delay and High-Voltage Switch Delay Input.
Connect a capacitor from DLP to GND to set the delay time. A 5µA current
source charges CDLP. DLP is internally pulled to GND by a 10Ω resistor in
shutdown.
Negative Charge-Pump Feedback Input. Connect FBN to the center of a
resistive voltage-divider between the negative output and REF to set the output
voltage. Place the divider within 5mm of FBN. FBN is internally pulled to GND
through a 10Ω resistor in shutdown.
Switch Input. Source of the internal high-voltage p-channel MOSFET connected
to GON.
Typical Operating Circuit
Figures 1, 2, and 3 are the Typical Operating Circuits of
the MAX8710/MAX8761, MAX8711, and MAX8712 for
generating power rails in TFT LCD panels. The input
voltage range is from 10.8V to 13.2V. The AVDD output
is 10V at 300mA, the VGON output is 27V at 20mA, and
the VGOFF output is -5V at 50mA.
Detailed Description
The MAX8710/MAX8711/MAX8712/MAX8761 include a
high-performance linear regulator, a positive charge-
pump regulator, a negative charge-pump regulator, and
built-in power-up sequence control. The MAX8710/
MAX8711/MAX8761 also include a high-current opera-
tional amplifier. Additionally, the MAX8710/MAX8761 pro-
vide logic-controlled high-voltage switches to control the
positive charge-pump output. The linear regulator directly
steps down the input voltage to generate the source-dri-
ver ICs’ supply voltage. The two built-in charge-pump
regulators are used to generate the TFT gate-on and
gate-off supplies. 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.
Linear Regulator
The MAX8710/MAX8711/MAX8712/MAX8761 contain a
linear regulator including a PMOS pass transistor. The
MAX8710/MAX8711/MAX8712 can supply an output cur-
rent of at least 300mA and the MAX8761 can supply at
least 500mA. Connect an external resistive voltage-
divider between the regulator output and GND with the
midpoint connected to FBL to adjust the linear-regulator
output. An error amplifier compares the FBL voltage with
the 2.5V internal reference voltage and amplifies the dif-
ference. If the feedback voltage is higher than the
______________________________________________________________________________________ 11
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| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MAX8710.PDF ] | |
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