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Maxim Integrated Products
Maxim Integrated Products

MAX17117 Datasheet

Internal-Switch Boost Regulator


MAX17117 Datasheet Preview


19-5241; Rev 0; 4/10
EVAALVUAAILTAIOBNLEKIT
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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-
SHADING
TIMING
CONTROL
OP
PGND
FB
COMP
SS
AGND
(EP)
OPAS
OUT
POS
STH
SYSTEM
CK1
CK3
CK5
SCAN DRIVER AND
GATE-SHADING
CONTROL LOGIC
CK2
CK4
CK6
VVGL VGL
CKH1
CKH3
CKH5
S1
S3
S5
RO
CKH2
CKH4
CKH6
S2
S4
S6
RE
VGLC
VMAIN
TO VCOM
BACKPLANE
PANEL
________________________________________________________________ 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.
Page 1

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Internal-Switch Boost Regulator with Integrated
7-Channel Scan Driver, Op Amp, and LDO
ABSOLUTE MAXIMUM RATINGS
IN, ENA, FB, COMP, SS, DTS, LDOADJ, ST,
CK1–CK6, LDOO to AGND...............................-0.3V to +7.5V
PGND to AGND....................................................-0.3V to +0.3V
LX, OPAS to PGND................................................-0.3V to +18V
GHON to PGND.....................................................-0.3V to +45V
VGL to PGND........................................................ -20V to +0.3V
GHON to VGL.................................................................... +45V
STH, CKH1–CKH6, VGLC, RO,
RE to VGL..........................................-0.3V to (VGHON + 0.3V)
OUT, POS to PGND...............................-0.3V to (VOPAS + 0.3V)
GHON and VGL RMS Current Rating...................................0.8A
VGLC, STH, and CKH1–CKH6 RMS Current Rating............0.8A
LX, PGND RMS Current Rating............................................1.6A
Continuous Power Dissipation (TA = +70NC)
32-Pin TQFN (derate 24.9mW/NC above +70NC).......1990mW
Operating Temperature Range........................... -40NC to +85NC
Junction Temperature......................................................+150NC
Storage Temperature Range............................ -65NC to +160NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = +3V, Circuit of Figure 1, VOPAS = +8.5V, VGHON = +24V, VVGL = -6.2V, VST = VCK_ = 0V, TA = 0NC to +85NC, unless otherwise
noted. Typical values are at TA = +25NC.)
PARAMETER
IN Input Voltage Range
IN Undervoltage-Lockout
Threshold
IN Quiescent Current
IN Standby Current
GHON Standby Current
OPAS Standby Current
Thermal Shutdown
STEP-UP REGULATOR
Output Voltage Range
OPAS Overvoltage Threshold
Operating Frequency
Oscillator Maximum Duty Cycle
FB Regulation Voltage
FB Fault-Trip Level
Fault-Trigger Delay
FB Load Regulation
FB Line Regulation
FB Input-Bias Current
FB Transconductance
LX Current Limit
LX On-Resistance
LX Input-Bias Current
Current-Sense Transresistance
Soft-Start Pullup Current
CONDITIONS
VIN rising, typical hysteresis = 150mV
VFB = 1.3V, LX not switching
VFB = 1.2V, LX switching
VENA = VVGL = 0V, VIN = 5.5V, VGHON = 4V
VENA = VVGL = 0V, VIN = 5.5V, VGHON = 4V
VENA = VVGL = 0V, VIN = 5.5V, VGHON = 4V
Temperature rising
OPAS rising
No load
Falling edge
0 < ILOAD < full load
VIN = 2.5V to 5.5V, TA = +25NC
VFB = 1.24V, TA = +25NC
DICOMP = Q2.5FA, FB = COMP
RENA = 10kW, duty cycle = 60%
ILX = 1A
VLX = 13.5V, TA = +25NC
MIN TYP MAX UNITS
2.3 5.5 V
1.80 2.00 2.20
V
1.0 2.5
2.5 5
0.7 2
100 200
20 50
145 170
mA
mA
FA
FA
NC
VIN
16.5
1000
91
1.227
1.05
75
1.6
0.10
2
17
1200
94
1.240
1.10
160
-0.2
0.1
65
160
2
200
10
0.20
4
15
18
1400
97
1.252
1.15
0.25
200
280
2.4
500
20
0.30
6
V
V
kHz
%
V
V
ms
%
%/V
nA
FS
A
mI
FA
V/A
FA
2   _______________________________________________________________________________________
Page 2

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Internal-Switch Boost Regulator with Integrated
7-Channel Scan Driver, Op Amp, and LDO
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3V, Circuit of Figure 1, VOPAS = +8.5V, VGHON = +24V, VVGL = -6.2V, VST = VCK_ = 0V, TA = 0NC to +85NC, unless otherwise
noted. Typical values are at TA = +25NC.)
PARAMETER
VCOM BUFFER
OPAS Voltage Range
OPAS Supply Current
OUT Voltage Swing High
CONDITIONS
VPOS = VOPAS/2, no load
IOUT = 5mA
MIN TYP MAX UNITS
5
VOPAS
- 100
0.8
VOPAS
- 50
15
1.2
V
mA
mV
OUT Voltage Swing Low
OUT Short-Circuit Current
POS Input-Bias Current
POS Input-Offset Voltage
Gain-Bandwidth Product
-3dB Bandwidth
Slew Rate
IOUT = 5mA
Sourcing, short to VOPAS/2 - 1V
Sinking, short to VOPAS/2 + 1V
VPOS = VOPAS/2, TA = +25NC
VOUT = VOPAS/2
RLOAD = 10kI, CLOAD = 10pF
5V pulse applied to POS, OUT measured from 10% to
90%
50 100 mV
100 200
100 200
mA
-50 +50 nA
-15 +15 mV
8 MHz
16 MHz
10 40
V/Fs
HIGH-VOLTAGE SCAN DRIVER
GHON Voltage Range
VGL Voltage Range
GHON-to-VGL Voltage Range
GHON Supply Current
VGL Supply Current
Output Impedance Low
Output Impedance High
Gate-Shading Switch Resistance
RO, RE Resistance Range
Propagation Delay from ST
Rising Edge to STH Rising Edge
VGHON - VVGL
CK1 through CK6 and ST low
CK1 through CK6 and ST low
STH, CKH_, VGLC, IOUT = -20mA
STH, CKH_, VGLC, IOUT = +20mA
CKH1, CKH3, CKH5, IRE = 10mA
CKH2, CKH4, CKH6, IRO = 10mA
CLOAD = 100pF, RLOAD = 0I
12
-15
-500
350
-300
100
100
35
-3
40
550
80
80
100
100
200
V
V
V
FA
FA
I
I
I
I
ns
Propagation Delay from ST
Falling Edge to STH Falling Edge
CLOAD = 100pF, RLOAD = 0I
100 200
ns
Propagation Delay from CK_
Rising Edge to CKH_ Rising
Edge
CLOAD = 100pF, RLOAD = 0I
100 200
ns
Propagation Delay from CK_
Falling Edge to CKH_ Falling
Edge
CLOAD = 100pF, RLOAD = 0I
100 200
ns
STH, VGLC, CKH_ Rise Time
STH, VGLC, CKH_ Fall Time
STH, CKH_ Operating Frequency
Range
CLOAD = 5nF, RLOAD = 0I; VGHON = 30V,
VVGL = -10V; measured from 10% to 90%
CLOAD = 5nF, RLOAD = 0I; VGHON = 30V,
VVGL = -10V; measured from 10% to 90%
CLOAD = 5nF, RLOAD = 0I
0.5 1
Fs
0.5 1
Fs
100 kHz
_______________________________________________________________________________________   3
Page 3
Part Number MAX17117
Manufactur Maxim Integrated Products
Description Internal-Switch Boost Regulator
Total Page 22 Pages
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