19-3244; Rev 0; 4/04
KIT
ATION
EVALU
BLE
AVAILA
TFT-LCD DC-DC Converters with
Operational Amplifiers
Features
♦
2.6V to 5.5V 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
General Description
The MAX1516/MAX1517/MAX1518 include a high-perfor-
mance step-up regulator, two linear-regulator controllers,
and 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 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 MAX1518 includes five high-performance
operational amplifiers, the MAX1517 includes three,
and the MAX1516 includes one operational amplifier.
These amplifiers are designed to drive the LCD back-
plane (VCOM) and/or the gamma-correction divider
string. The devices feature high output current
(±150mA), fast slew rate (13V/µs), wide bandwidth
(12MHz), and rail-to-rail inputs and outputs.
The MAX1516/MAX1517/MAX1518 are available in 32-
pin thin QFN packages with a maximum thickness of
0.8mm for ultra-thin LCD panels.
MAX1516/MAX1517/MAX1518
Minimal Operating Circuit
V
CN
V
CP
V
IN
LX
IN
STEP-UP
CONTROLLER
PGND
COMP
AGND
FB
V
MAIN
Applications
Notebook Computer Displays
LCD Monitor Panels
Automotive Displays
V
CP
MAX1518
DRVP
GATE-ON
CONTROLLER
FBP
V
GON
Ordering Information
PART
MAX1516ETJ
MAX1517ETJ
MAX1518ETJ
TEMP RANGE
-40°C to +100°C
-40°C to +100°C
-40°C to +100°C
PIN-PACKAGE
32 Thin QFN 5mm x 5mm
32 Thin QFN 5mm x 5mm
32 Thin QFN 5mm x 5mm
SRC
DEL
COM
SWITCH
CONTROL
CTL
V
CN
DRN
DRVN
GATE-OFF
CONTROLLER
SUP
NEG1
FBN
V
GOFF
OUT1
OP1
REF
REF
NEG4
POS1
NEG2
OUT2
OP2
OP4
OUT4
POS2
POS4
NEG5
OUT3
OP3
OP5
OUT5
POS3
BGND
POS5
Pin Configurations appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
TFT-LCD DC-DC Converters with
Operational Amplifiers
MAX1516/MAX1517/MAX1518
ABSOLUTE MAXIMUM RATINGS
IN, CTL to AGND ......................................................-0.3V to +6V
COMP, FB, FBP, FBN, DEL, REF to AGND ....-0.3V to (V
IN
+ 0.3V)
PGND, BGND to AGND ......................................................±0.3V
LX to PGND ............................................................-0.3V to +14V
SUP to AGND .........................................................-0.3V to +14V
DRVP, SRC to AGND..............................................-0.3V to +30V
POS_, NEG_, OUT_ to AGND ...................-0.3V to (V
SUP
+ 0.3V)
POS1 to NEG1, POS2 to NEG2, POS3 to NEG3,
POS4 to NEG4, POS5 to NEG5 ...............................-6V to +6V
DRVN to AGND ...................................(V
IN
- 30V) to (V
IN
+ 0.3V)
COM, DRN to AGND ................................-0.3V to (V
SRC
+ 0.3V)
DRN to COM............................................................-30V to +30V
OUT_ Maximum Continuous Output Current....................±75mA
LX Switch Maximum Continuous RMS Output Current .........1.6A
Continuous Power Dissipation (T
A
= +70°C)
32-Pin Thin QFN (derate 21.2mW/°C above +70°C) ..1702mW
Operating Temperature Range .........................-40°C to +100°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
(V
IN
= 3V, V
SUP
= 8V, PGND = AGND = BGND = 0, I
REF
= 25µA,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless other-
wise noted.)
PARAMETER
IN Supply Range
IN Undervoltage-Lockout
Threshold
SYMBOL
V
IN
V
UVLO
V
IN
rising, typical hysteresis = 150mV
V
FB
= V
FBP
= 1.4V, V
FBN
= 0,
LX not switching
IN Quiescent Current
I
IN
V
FB
= 1.1V, V
FBP
= 1.4V, V
FBN
= 0,
LX switching
CONDITIONS
MIN
2.6
2.3
2.5
0.6
6
55
-2µA < I
REF
< 50µA, V
IN
= 2.6V to 5.5V
Temperature rising
Hysteresis
V
MAIN
f
OSC
T
A
= +25°C to +85°C
T
A
= 0°C to +85°C
V
IN
1020
84
V
FB
No load
V
FB
falling
0 < I
MAIN
< full load, transient only
V
IN
= 2.6V to 5.5V
V
FB
= 1.4V
∆I
COMP
= 5µA
FB to COMP
-40
75
150
600
1.221
1.218
0.96
1200
87
1.233
1.233
1.00
-1.6
+0.04
±0.15
+40
280
1.231
1.250
+160
15
13
1380
90
1.245
1.247
1.04
1.269
TYP
MAX
5.5
2.7
0.8
mA
11
ms
V
°C
UNITS
V
V
Duration to Trigger Fault
Condition
REF Output Voltage
Thermal Shutdown
MAIN STEP-UP REGULATOR
Output Voltage Range
Operating Frequency
Oscillator Maximum Duty Cycle
FB Regulation Voltage
FB Fault Trip Level
FB Load Regulation
FB Line Regulation
FB Input Bias Current
FB Transconductance
FB Voltage Gain
V
kHz
%
V
V
%
%/ V
nA
µS
V/ V
2
_______________________________________________________________________________________
TFT-LCD DC-DC Converters with
Operational Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3V, V
SUP
= 8V, PGND = AGND = BGND = 0, I
REF
= 25µA,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless other-
wise noted.)
PARAMETER
LX On-Resistance
LX Leakage Current
LX Current Limit
Current-Sense
Transconductance
Soft-Start Period
Soft-Start Step Size
OPERATIONAL AMPLIFIERS
SUP Supply Range
SUP Supply Current
V
SUP
MAX1518
I
SUP
Buffer configuration,
V
POS
_ = 4V, no load
MAX1517
MAX1516
4.5
3.2
2
0.7
0
+1
0
0
≤
(V
NEG
_, V
POS
_)
≤
V
SUP
45
125
I
OUT
_ = 100µA
Output Voltage Swing, High
V
OH
I
OUT
_ = 5mA
Output Voltage Swing, Low
Short-Circuit Current
Output Source and Sink Current
Power-Supply Rejection Ratio
Slew Rate
-3dB Bandwidth
Gain-Bandwidth Product
FBP Regulation Voltage
FBP Fault Trip Level
FBP Input Bias Current
FBP Effective Load-Regulation
Error (Transconductance)
I
FBP
GBW
V
FBP
R
L
= 10kΩ, C
L
= 10pF, buffer configuration
Buffer configuration
I
DRVP
= 100µA
V
FBP
falling
V
FBP
= 1.4V
V
DRVP
= 10V, I
DRVP
= 50µA to 1mA
1.231
0.96
-50
-0.7
PSRR
V
OL
I
OUT
_ = -100µA
I
OUT
_ = -5mA
To V
SUP
/ 2, source or sink
(V
NEG
_ , V
POS
_, V
OUT
_)
≅
V
SUP
/ 2,
|∆V
OS
| < 10mV
DC, 6V
≤
V
SUP
≤
13V,
(V
NEG
_, V
POS
_)
≅
V
SUP
/2
50
40
60
13
12
8
1.250
1.00
1.269
1.04
+50
-1.5
V
SUP
-
15
V
SUP
-
150
V
SUP
-
3
mV
V
SUP
-
80
2
70
150
15
150
mV
mA
mA
dB
V/µs
MHz
MHz
V
V
nA
%
13.0
4.8
3
1.1
12
±50
V
SUP
mV
nA
V
dB
dB
mA
V
t
SS
SYMBOL
R
LX(ON)
I
LX
I
LIM
V
LX
= 13V
V
FB
= 1V, duty cycle = 65%
2.5
3.0
CONDITIONS
MIN
TYP
160
0.02
3.0
3.8
14
I
LIM
/ 8
MAX
250
40
3.5
5
UNITS
mΩ
µA
A
S
ms
A
MAX1516/MAX1517/MAX1518
Input Offset Voltage
Input Bias Current
Input Common-Mode Range
Common-Mode Rejection Ratio
Open-Loop Gain
V
OS
I
BIAS
V
CM
CMRR
(V
NEG
_, V
POS
_, V
OUT
_)
≅
V
SUP
/ 2,
T
A
= +25°C
(V
NEG
_ , V
POS
_, V
OUT
_)
≅
V
SUP
/ 2
GATE-ON LINEAR-REGULATOR CONTROLLER
_______________________________________________________________________________________
3
TFT-LCD DC-DC Converters with
Operational Amplifiers
MAX1516/MAX1517/MAX1518
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3V, V
SUP
= 8V, PGND = AGND = BGND = 0, I
REF
= 25µA,
T
A
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless other-
wise noted.)
PARAMETER
FBP Line (IN) Regulation Error
DRVP Sink Current
DRVP Off-Leakage Current
Soft-Start Period
Soft-Start Step Size
GATE-OFF LINEAR-REGUALTOR CONTROLLER
FBN Regulation Voltage
FBN Fault Trip Level
FBN Input Bias Current
FBN Effective Load-Regulation
Error (Transconductance)
FBN Line (IN) Regulation Error
DRVN Source Current
DRVN Off-Leakage Current
Soft-Start Period
Soft-Start Step Size
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES
DEL Capacitor Charge Current
DEL Turn-On Threshold
DEL Discharge Switch On-
Resistance
CTL Input Low Voltage
CTL Input High Voltage
CTL Input Leakage Current
CTL-to-SRC Propagation Delay
SRC Input Voltage Range
SRC Input Current
SRC to COM Switch On-
Resistance
DRN to COM Switch On-
Resistance
COM to PGND Switch On-
Resistance
I
SRC
R
SRC(ON)
R
DRN(ON)
R
COM(ON)
V
DEL
= 1.5V, CTL = IN
V
DEL
= 1.5V, CTL = AGND
V
DEL
= 1.5V, CTL = IN
V
DEL
= 1.5V, CTL = AGND
V
DEL
= 1.1V
350
50
15
6
35
1000
V
TH(DEL)
During UVLO, V
IN
= 2.2V
V
IN
= 2.6V to 5.5V
V
IN
= 2.6V to 5.5V
CTL = AGND or IN
2
-1
100
28
100
30
12
70
1800
+1
During startup, V
DEL
= 1V
4
1.19
5
1.25
20
0.6
6
1.31
µA
V
Ω
V
V
µA
ns
V
µA
Ω
Ω
Ω
t
SS
I
DRVN
I
FBN
V
FBN
I
DRVN
= 100µA
V
FBN
rising
V
FBN
= 0
V
DRVN
= -10V, I
DRVN
= 50µA to 1mA
I
DRVN
= 0.1mA, 2.6V < V
IN
< 5.5V
V
FBN
= 500mV, V
DRVN
= -10V
V
FBN
= 0V, V
DRVN
= -25V
1
235
370
-50
11
+0.7
4
-0.01
14
V
REF
/
128
-10
250
420
265
470
+50
25
±5
mV
mV
nA
mV
mV
mA
µA
ms
V
t
SS
I
DRVP
SYMBOL
CONDITIONS
I
DRVP
= 100µA, 2.6V < V
IN
< 5.5V
V
FBP
= 1.1V, V
DRVP
= 10V
V
FBP
= 1.4V, V
DRVP
= 28V
1
MIN
TYP
±1.5
5
0.01
14
V
REF
/
128
10
MAX
±5
UNITS
mV
mA
µA
ms
V
4
_______________________________________________________________________________________
TFT-LCD DC-DC Converters with
Operational Amplifiers
ELECTRICAL CHARACTERISTICS
(V
IN
= 3V, V
SUP
= 8V, PGND = AGND = BGND = 0, I
REF
= 25µA,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
IN Supply Range
IN Undervoltage-Lockout
Threshold
SYMBOL
V
IN
V
UVLO
V
IN
rising, typical hysteresis = 150mV
V
FB
= V
FBP
= 1.4V, V
FBN
= 0,
LX not switching
IN Quiescent Current
I
IN
V
FB
= 1.1V, V
FBP
= 1.4V, V
FBN
= 0,
LX switching
-2µA < I
REF
< 50µA, V
IN
= 2.6V to 5.5V
V
MAIN
f
OSC
V
FB
No load
V
IN
= 2.6V to 5.5V
V
FB
= 1.4V
∆I
COMP
= 5µA
R
LX(ON)
I
LIM
V
SUP
MAX1518
SUP Supply Current
Input Offset Voltage
Input Common-Mode Range
I
SUP
V
OS
V
CM
I
OUT
_ = 100µA
Output Voltage Swing, High
V
OH
I
OUT
_ = 5mA
Output Voltage Swing, Low
Short-Circuit Current
Output Source and Sink Current
V
OL
I
OUT
_ = -100µA
I
OUT
_ = -5mA
To V
SUP
/ 2
Source
Sink
50
50
40
Buffer configuration,
V
POS
_ = 4V, no load
MAX1517
MAX1516
0
V
SUP
-
15
mV
V
SUP
-
150
15
150
mV
mA
mA
V
FB
= 1V, duty cycle = 65%
2.5
4.5
-40
75
1.222
V
IN
1020
1.212
CONDITIONS
MIN
2.6
2.265
MAX
5.5
2.715
0.8
mA
11
1.269
13
1380
1.250
±0.15
+40
300
250
3.5
13.0
4.8
3.0
1.1
12
V
SUP
mV
V
mA
V
V
kHz
V
%/ V
nA
µS
mΩ
A
V
UNITS
V
V
MAX1516/MAX1517/MAX1518
REF Output Voltage
MAIN STEP-UP REGULATOR
Output Voltage Range
Operating Frequency
FB Regulation Voltage
FB Line Regulation
FB Input Bias Current
FB Transconductance
LX On-Resistance
LX Current Limit
OPERATIONAL AMPLIFIERS
SUP Supply Range
(V
NEG
_, V
POS
_, V
OUT
_)
≅
V
SUP
/ 2
(V
NEG
_ , V
POS
_, V
OUT
_)
≅
V
SUP
/ 2,
|∆V
OS
| < 10mV
V
FBP
I
DRVP
= 100µA
GATE-ON LINEAR-REGULATOR CONTROLLER
FBP Regulation Voltage
1.218
1.269
V
_______________________________________________________________________________________
5
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