Datasheet

General Description
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.
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%.
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 (±130mA), fast slew rate (45V/µs), wide
bandwidth (20MHz), and rail-to-rail inputs and outputs.
The MAX8795A is available in a lead-free, 32-pin, thin
QFN package with a maximum thickness of 0.8mm for
ultra-thin LCD panels, as well as in a 32-pin LQFP
package with 0.8mm pin pitch.
Applications
Notebook Computer Displays
LCD Monitor Panels
Automotive Displays
Features
o 2.5V to 5.5V Input Supply Range
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%)
o Linear-Regulator Controllers for V
GON
and V
GOFF
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
Adjustable Delay
o Timer-Delay Fault Latch for All Regulator Outputs
o Thermal-Overload Protection
o 0.6mA Quiescent Current
MAX8795A
TFT-LCD DC-DC Converter with
Operational Amplifiers
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
STEP-UP
CONTROLLER
GATE-ON
CONTROLLER
SWITCH
CONTROL
GATE-OFF
CONTROLLER
REF
V
CN
V
CP
V
MAIN
LX
FB
PGND
AGND
DRVP
FBP
V
CP
V
GON
V
CN
V
GOFF
DEL
CTL
DRVN
FBN
NEG4
REF
POS4
NEG5
POS5
OUT4
OUT5
BGND
NEG2
POS2
OP3
POS3
OUT2
OUT3
POS1
OUT1
NEG1
SUP
COM
DRN
SRC
COMP
IN
V
IN
MAX8795A
OP2
OP1
OP5
OP4
EP
Minimal Operating Circuit
19-0793; Rev 5; 5/12
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.
PART TEMP RANGE PIN-PACKAGE
MAX8795AETJ+ -40°C to +85°C 32 Thi n QFN
MAX8795AGCJ+ -40°C to +105°C 32 LQ FP
MAX8795AGCJ/V+ -40°C to +105°C 32 LQ FP
MAX8795AGTJ+ -40°C to +105°C 32 TQ FN
MAX8795AGTJ/V+ -40°C to +105°C 32 TQ FN
Pin Configurations appear at end of data sheet.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive-qualified part.
EVALUATION KIT
AVAILABLE