MAX17117 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – Internal-Switch Boost Regulator with Integrated 7-Channel Scan Driver, Op Amp, and LDO

19-5241; Rev 0; 4/10
EVAALVUAAILTAIOBNLEKIT
Internal-Switch Boost Regulator with Integrated
7-Channel Scan Driver, Op Amp, and LDO
General Description
The MAX17117 includes a high-performance step-up
regulator, a 350mA low-dropout (LDO) linear regulator,
a high-speed operational amplifier, and a high-voltage
level-shifting scan driver with gate-shading control. The
device is optimized for thin-film transistor (TFT) liquid-
crystal display (LCD) applications.
The step-up DC-DC converter provides the regulated
supply voltage for panel source-driver ICs. The high
1.2MHz switching frequency allows the use of ultra-small
inductors and ceramic capacitors. The current-mode
control architecture provides a fast-transient response to
pulsed loads typical of source driver loads. The step-up
regulator features an adjustable soft-start and an adjust-
able cycle-by-cycle current limit.
The high-current operational amplifier is designed to
drive the LCD backplane (VCOM). The amplifier features
high output current (Q200mA typ), fast slew rate (40V/Fs
typ), wide bandwidth (16MHz typ), and rail-to-rail inputs
and outputs.
The low-voltage LDO linear regulator has an integrated
0.8I pass element and can provide at least 350mA. The
output voltage is accurate within Q1%.
The high-voltage, level-shifting scan driver with gate-
shading control is designed to drive the TFT panel gate
drivers. Its seven outputs swing 40V (maximum) between
+35V (maximum) and -15V (minimum) and can swiftly
drive capacitive loads.
The MAX17117 is available in a 32-pin, 5mm x 5mm, thin
QFN package with a maximum thickness of 0.8mm for
thin LCD panels.
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX17117ETJ+
-40NC to +85NC
32 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Applications
Notebook Computer Displays
Features
S 2.3V to 5.5V IN Supply-Voltage Range
S 1.2MHz Current-Mode Step-Up Regulator
Fast-Transient Response
High-Accuracy Reference (1%)
Integrated 16V, 2A, 200mI MOSFET
High Efficiency (> 85%)
Adjustable Cycle-by-Cycle Current Limit
S High-Performance Operational Amplifier
200mA Output Short-Circuit Current
40V/µs Slew Rate
16MHz, -3dB Bandwidth
Low-Dropout Linear Regulator
High-Accuracy Output Voltage (1.0%)
S High-Voltage Drivers with Scan Logic
+35V to -15V Outputs
40V Maximum Voltage Swing
Gate-Shading Control
S Thermal-Overload Protection
S 32-Pin, 5mm x 5mm, Thin QFN Package
Simplified Operating Circuit
VVGL
VGHON
VIN
IN
LX
ENA
LDOADJ
VLOGIC
LDOO
DTS
VGHON
GHON
ST
SETUP
CONTROLLER
LINEAR
REGULATOR
MAX17117
GATE-
OP
SHADING
TIMING
CONTROL
PGND
FB
COMP
SS
AGND
(EP)
OPAS
OUT
POS
STH
CK1
CKH1
CK3
CKH3
CK5
SYSTEM
SCAN DRIVER AND
GATE-SHADING
CONTROL LOGIC
CK2
CK4
CK6
VGL
VVGL
CKH5
S1
S3
S5
RO
CKH2
CKH4
CKH6
S2
S4
S6
RE
VGLC
VMAIN
TO VCOM
BACKPLANE
PANEL
________________________________________________________________ Maxim Integrated Products   1
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or visit Maxim’s website at www.maxim-ic.com.