MAX1518B Datasheet, PDF (1/25 Pages) Maxim Integrated Products – TFT-LCD DC-DC Converter with Operational Amplifiers

19-3244; Rev 0; 10/05
EVAALVUAAILTAIOBNLEKIT
TFT-LCD DC-DC Converter with
Operational Amplifiers
General Description
The MAX1518B includes a high-performance step-up
regulator, two linear-regulator controllers, and high-cur-
rent operational amplifiers for active-matrix, thin-film tran-
sistor (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 14V 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 MAX1518B 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 (±150mA), fast slew rate (13V/µs), wide
bandwidth (12MHz), and rail-to-rail inputs and outputs.
The MAX1518B is available in a 32-pin thin QFN pack-
age with a maximum thickness of 0.8mm for ultra-thin
LCD panels.
Applications
Notebook Computer Displays
LCD Monitor Panels
Automotive Displays
Ordering Information
PART
TEMP _PIN-PACKAGE
RANGE
PKG
CODE
MAX1518BETJ
-40°C to
+100°C
32 Thin QFN 5mm x 5mm
T3255-4
Features
♦ 2.6V to 6.5V Input Supply Range
♦ 1.2MHz Current-Mode Step-Up Regulator
Fast Transient Response to Pulsed Load
High-Accuracy Output Voltage (1.5%)
Built-In 14V, 2.4A, 0.16Ω n-Channel MOSFET
High Efficiency (90%)
♦ Linear-Regulator Controllers for V_GON and V_GOFF
♦ High-Performance Operational Amplifiers
±150mA Output Short-Circuit Current
13V/µs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Inputs/Outputs
♦ Logic-Controlled, High-Voltage Switch with
Adjustable Delay
♦ Timer-Delay Fault Latch for All Regulator Outputs
♦ Thermal-Overload Protection
♦ 0.6mA Quiescent Current
Minimal Operating Circuit
VCN
VCP
VIN
LX
IN
FB
STEP-UP
CONTROLLER
COMP
PGND
AGND
MAX1518B
DRVP
GATE-ON
CONTROLLER
FBP
SRC
COM
SWITCH
CONTROL
DRN
SUP
NEG1
OUT1
OP1
POS1
NEG2
GATE-OFF
CONTROLLER
REF
DEL
CTL
DRVN
FBN
REF
NEG4
OUT2 _OP2
POS2
OP4
OUT4
POS4
NEG5
OUT3
OP3
POS3
OUT5
OP5
BGND
POS5
VMAIN
VCP
VGON
VCN
VGOFF
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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