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.