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MAX8795A_12

更新时间： 2024-11-11 07:17:23
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TFT-LCD DC-DC Converter with Operational Amplifiers

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MAX8795A_12 数据手册

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19-079ꢀ; Rev 5; 5/12  
TFT-LCD DC-DC Converter with  
Operational Amplifiers  
MX8795A  
General Description  
Features  
o 2.5V to 5.5V Input Supply Range  
The MAX8795A includes a high-performance step-up  
regulator, two linear-regulator controllers, and five high-  
current operational amplifiers for active-matrix, thin-film  
transistor (TFT), liquid-crystal displays (LCDs). Also  
included is a logic-controlled, high-voltage switch with  
adjustable delay.  
o 1.2MHz Current-Mode Step-Up Regulator  
Fast Transient Response to Pulsed Load  
High-Accuracy Output Voltage (1%)  
Built-In 20V, 3A, 0.16Ω n-Channel MOSFET  
High Efficiency (85%)  
The step-up DC-DC converter provides the regulated  
supply voltage for the panel source driver ICs. The con-  
verter is a high-frequency (1.2MHz) current-mode regu-  
lator with an integrated 20V n-channel MOSFET that  
allows the use of ultra-small inductors and ceramic  
capacitors. It provides fast transient response to pulsed  
loads while achieving efficiencies over 85%.  
o Linear-Regulator Controllers for V  
and V  
GOFF  
GON  
o High-Performance Operational Amplifiers  
130mA Output Short-Circuit Current  
45V/µs Slew Rate  
20MHz, -3dB Bandwidth  
Rail-to-Rail Inputs/Outputs  
o Logic-Controlled, High-Voltage Switch with  
The gate-on and gate-off linear-regulator controllers  
provide regulated TFT gate-on and gate-off supplies  
using external charge pumps attached to the switching  
node. The MAX8795A includes five high-performance  
operational amplifiers. These amplifiers are designed to  
drive the LCD backplane (VCOM) and/or the gamma-  
correction divider string. The device features high out-  
put current ( 1ꢀ0mA), fast slew rate (ꢁ5V/ꢂs), wide  
bandwidth (20MHz), and rail-to-rail inputs and outputs.  
Adjustable Delay  
o Timer-Delay Fault Latch for All Regulator Outputs  
o Thermal-Overload Protection  
o 0.6mA Quiescent Current  
Minimal Operating Circuit  
V
V
CP  
CN  
The MAX8795A is available in a lead-free, ꢀ2-pin, thin  
QFN package with a maximum thickness of 0.8mm for  
ultra-thin LCD panels, as well as in a ꢀ2-pin LQFP  
package with 0.8mm pin pitch.  
V
V
MAIN  
IN  
LX  
IN  
FB  
STEP-UP  
CONTROLLER  
PGND  
AGND  
COMP  
Applications  
Notebook Computer Displays  
LCD Monitor Panels  
V
V
CP  
MAX8795A  
DRVP  
FBP  
GATE-ON  
CONTROLLER  
GON  
Automotive Displays  
SRC  
COM  
DRN  
DEL  
CTL  
SWITCH  
CONTROL  
V
V
CN  
Ordering Information  
DRVN  
FBN  
PART  
TEMP RANGE  
-ꢁ0°C to +85°C  
-ꢁ0°C to +105°C  
-ꢁ0°C to +105°C  
-ꢁ0°C to +105°C  
-ꢁ0°C to +105°C  
PIN-PACKAGE  
ꢀ2 Thin QFN  
ꢀ2 LQFP  
GATE-OFF  
CONTROLLER  
GOFF  
SUP  
MAX8795AETJ+  
MAX8795AGCJ+  
MAX8795AGCJ/V+  
MAX8795AGTJ+  
MAX8795AGTJ/V+  
NEG1  
OUT1  
OP1  
OP2  
ꢀ2 LQFP  
REF  
POS1  
NEG2  
REF  
ꢀ2 TQFN  
NEG4  
ꢀ2 TQFN  
OUT2  
POS2  
OUT4  
OP4  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
/V denotes an automotive-qualified part.  
POS4  
NEG5  
OUT3  
POS3  
OUT5  
POS5  
OP3  
OP5  
BGND  
EP  
Pin Configurations appear at end of data sheet.  
________________________________________________________________ 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.  
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