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MAX1517ETJ+-MAX1517ETJ+T-MAX1517ETJ+TG104-MAX1518ETJ+-MAX1518ETJ+T
TFT-LCD DC-DC Converters with Operational Amplifiers
General DescriptionThe 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.
ApplicationsNotebook Computer Displays
LCD Monitor Panels
Automotive Displays
Features2.6V to 5.5V Input Supply Range1.2MHz Current-Mode Step-Up Regulator
Fast Transient Response to Pulsed Load
High-Accuracy Output Voltage (1.5%)
Built-In 14V, 2.4A, 0.16ΩN-Channel MOSFET
High Efficiency (90%)Linear-Regulator Controllers for VGONand VGOFFHigh-Performance Operational Amplifiers
±150mA Output Short-Circuit Current
13V/µs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Inputs/OutputsLogic-Controlled, High-Voltage Switch with
Adjustable DelayTimer-Delay Fault Latch for All Regulator OutputsThermal-Overload Protection0.6mA Quiescent Current
MAX1516/MAX1517/MAX1518
TFT-LCD DC-DC Converters with
Operational Amplifiers
Ordering InformationSTEP-UP
CONTROLLER
GATE-ON
CONTROLLER
SWITCH
CONTROL
GATE-OFF
CONTROLLER
REF
VCNVCP
VMAIN
PGND
AGND
DRVP
FBP
VCP
VGON
VCN
VGOFF
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
VIN
MAX1518
OP2
OP1
OP5
OP4
Minimal Operating Circuit19-3244; Rev 0; 4/04
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-PACKAGE
MAX1516ETJ-40°C to +100°C32 Thin QFN 5mm x 5mm
MAX1517ETJ-40°C to +100°C32 Thin QFN 5mm x 5mm
MAX1518ETJ-40°C to +100°C32 Thin QFN 5mm x 5mm
MAX1516/MAX1517/MAX1518
TFT-LCD DC-DC Converters with
Operational Amplifiers
ABSOLUTE MAXIMUM RATINGSStresses 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.
IN, CTL to AGND......................................................-0.3V to +6V
COMP, FB, FBP, FBN, DEL, REF to AGND....-0.3V to (VIN+ 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 (VSUP+ 0.3V)
POS1 to NEG1, POS2 to NEG2, POS3 to NEG3,
POS4 to NEG4, POS5 to NEG5...............................-6V to +6V
DRVN to AGND...................................(VIN- 30V) to (VIN+ 0.3V)
COM, DRN to AGND................................-0.3V to (VSRC+ 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 (TA= +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
ELECTRICAL CHARACTERISTICS(VIN= 3V, VSUP= 8V, PGND = AGND = BGND = 0, IREF= 25µA, TA
= 0°C to +85°C. Typical values are at TA= +25°C, unless other-
wise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSIN Supply RangeVIN2.65.5V
IN Undervoltage-Lockout
ThresholdVUVLOVIN rising, typical hysteresis = 150mV2.32.52.7V
VFB = VFBP = 1.4V, VFBN = 0,
LX not switching0.60.8
IN Quiescent CurrentIIN
VFB = 1.1V, VFBP = 1.4V, VFBN = 0,
LX switching611
Duration to Trigger Fault
Condition55ms
REF Output Voltage-2µA < IREF < 50µA, VIN = 2.6V to 5.5V1.2311.2501.269V
Temperature rising+160Thermal ShutdownHysteresis15°C
MAIN STEP-UP REGULATOROutput Voltage RangeVMAINVIN13V
Operating FrequencyfOSC102012001380kHz
Oscillator Maximum Duty Cycle848790%
TA = +25°C to +85°C1.2211.2331.245FB Regulation VoltageVFBNo loadTA = 0°C to +85°C1.2181.2331.247V
FB Fault Trip LevelVFB falling0.961.001.04V
FB Load Regulation0 < IMAIN < full load, transient only-1.6%
FB Line RegulationVIN = 2.6V to 5.5V+0.04±0.15%/ V
FB Input Bias CurrentVFB = 1.4V-40+40nA
FB TransconductanceΔICOMP = 5µA75150280µS
FB Voltage GainFB to COMP600V/ V
MAX1516/MAX1517/MAX1518
TFT-LCD DC-DC Converters with
Operational Amplifiers
ELECTRICAL CHARACTERISTICS (continued)(VIN= 3V, VSUP= 8V, PGND = AGND = BGND = 0, IREF= 25µA, TA
= 0°C to +85°C. Typical values are at TA= +25°C, unless other-
wise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLX On-ResistanceRLX(ON)160250mΩ
LX Leakage CurrentILXVLX = 13V0.0240µA
LX Current LimitILIMVFB = 1V, duty cycle = 65%2.53.03.5A
Current-Sense
Transconductance3.03.85S
Soft-Start PeriodtSS14ms
Soft-Start Step SizeILIM / 8A
OPERATIONAL AMPLIFIERSSUP Supply RangeVSUP4.513.0V
MAX15183.24.8
MAX151723SUP Supply CurrentISUPBuffer configuration,
VPOS_ = 4V, no loadMAX15160.71.1
Input Offset VoltageVOS(VNEG_, VPOS_, VOUT_) ≅ VSUP / 2,
TA = +25°C012mV
Input Bias CurrentIBIAS(VNEG_ , VPOS_, VOUT_) ≅ VSUP / 2+1±50nA
Input Common-Mode RangeVCM0VSUPV
Common-Mode Rejection RatioCMRR0 ≤ (VNEG_, VPOS_) ≤ VSUP45dB
Open-Loop Gain125dB
IOUT_ = 100µAVSUP -
VSUP -
Output Voltage Swing, HighVOH
IOUT_ = 5mAVSUP -
VSUP -
IOUT_ = -100µA215Output Voltage Swing, LowVOLIOUT_ = -5mA70150mV
Short-Circuit CurrentTo VSUP / 2, source or sink50150mA
Output Source and Sink Current(VNEG_ , VPOS_, VOUT_) ≅ VSUP / 2,
|ΔVOS| < 10mV40mA
Power-Supply Rejection RatioPSRRDC, 6V ≤ VSUP ≤ 13V,
(VNEG_, VPOS_) ≅ VSUP/260dB
Slew Rate13V/µs
-3dB BandwidthRL = 10kΩ, CL = 10pF, buffer configuration12MHz
Gain-Bandwidth ProductGBWBuffer configuration8MHz
GATE-ON LINEAR-REGULATOR CONTROLLERFBP Regulation VoltageVFBPIDRVP = 100µA 1.231 1.250 1.269 VFBP Fault Trip LevelVFBP falling 0.96 1.00 1.04 VFBP Input Bias CurrentIFBPVFBP = 1.4V -50 +50 nAFBP Effective Load-Regulation
Error (Transconductance)VDRVP = 10V, IDRVP = 50µA to 1mA -0.7 -1.5 %
MAX1516/MAX1517/MAX1518
TFT-LCD DC-DC Converters with
Operational Amplifiers
ELECTRICAL CHARACTERISTICS (continued)(VIN= 3V, VSUP= 8V, PGND = AGND = BGND = 0, IREF= 25µA, TA
= 0°C to +85°C. Typical values are at TA= +25°C, unless other-
wise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSFBP Line (IN) Regulation ErrorIDRVP = 100µA, 2.6V < VIN < 5.5V ±1.5 ±5 mVDRVP Sink CurrentIDRVPVFBP = 1.1V, VDRVP = 10V 1 5 mADRVP Off-Leakage CurrentVFBP = 1.4V, VDRVP = 28V 0.01 10 µASoft-Start PeriodtSS 14 ms
Soft-Start Step SizeVREF /
128V
GATE-OFF LINEAR-REGUALTOR CONTROLLERFBN Regulation VoltageVFBN IDRVN = 100µA 235 250 265 mVFBN Fault Trip Level VFBN rising 370 420 470 mVFBN Input Bias CurrentIFBN VFBN = 0 -50 +50 nAFBN Effective Load-Regulation
Error (Transconductance) VDRVN = -10V, IDRVN = 50µA to 1mA 11 25 mVFBN Line (IN) Regulation Error IDRVN = 0.1mA, 2.6V < VIN < 5.5V +0.7 ±5 mVDRVN Source CurrentIDRVN VFBN = 500mV, VDRVN = -10V 1 4 mADRVN Off-Leakage Current VFBN = 0V, VDRVN = -25V -0.01 -10 µASoft-Start PeriodtSS 14 msSoft-Start Step Size VREF /
128 V
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHESDEL Capacitor Charge CurrentDuring startup, VDEL = 1V456µA
DEL Turn-On ThresholdVTH(DEL)1.191.251.31V
DEL Discharge Switch On-
ResistanceDuring UVLO, VIN = 2.2V20Ω
CTL Input Low VoltageVIN = 2.6V to 5.5V0.6V
CTL Input High VoltageVIN = 2.6V to 5.5V2V
CTL Input Leakage CurrentCTL = AGND or IN-1+1µA
CTL-to-SRC Propagation Delay100ns
SRC Input Voltage Range28V
VDEL = 1.5V, CTL = IN50100SRC Input CurrentISRCVDEL = 1.5V, CTL = AGND1530µA
SRC to COM Switch On-
ResistanceRSRC(ON)VDEL = 1.5V, CTL = IN612Ω
DRN to COM Switch On-
ResistanceRDRN(ON)VDEL = 1.5V, CTL = AGND3570Ω
COM to PGND Switch On-
ResistanceRCOM(ON)VDEL = 1.1V35010001800Ω
MAX1516/MAX1517/MAX1518
TFT-LCD DC-DC Converters with
Operational Amplifiers
ELECTRICAL CHARACTERISTICS(VIN= 3V, VSUP= 8V, PGND = AGND = BGND = 0, IREF= 25µA, TA
= -40°C to +85°C,unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINMAXUNITSIN Supply RangeVIN2.65.5V
IN Undervoltage-Lockout
ThresholdVUVLOVIN rising, typical hysteresis = 150mV2.2652.715V
VFB = VFBP = 1.4V, VFBN = 0,
LX not switching0.8
IN Quiescent CurrentIIN
VFB = 1.1V, VFBP = 1.4V, VFBN = 0,
LX switching11
REF Output Voltage-2µA < IREF < 50µA, VIN = 2.6V to 5.5V1.2221.269V
MAIN STEP-UP REGULATOROutput Voltage RangeVMAINVIN13V
Operating FrequencyfOSC10201380kHz
FB Regulation VoltageVFBNo load1.2121.250V
FB Line RegulationVIN = 2.6V to 5.5V±0.15%/ V
FB Input Bias CurrentVFB = 1.4V-40+40nA
FB TransconductanceΔICOMP = 5µA75300µS
LX On-ResistanceRLX(ON)250mΩ
LX Current LimitILIMVFB = 1V, duty cycle = 65%2.53.5A
OPERATIONAL AMPLIFIERSSUP Supply RangeVSUP4.513.0V
MAX15184.8
MAX15173.0SUP Supply CurrentISUPBuffer configuration,
VPOS_ = 4V, no load
MAX15161.1
Input Offset VoltageVOS(VNEG_, VPOS_, VOUT_) ≅ VSUP / 212mV
Input Common-Mode RangeVCM0VSUPV
IOUT_ = 100µAVSUP -
Output Voltage Swing, HighVOH
IOUT_ = 5mAVSUP -
IOUT_ = -100µA15Output Voltage Swing, LowVOLIOUT_ = -5mA150mV
Source50Short-Circuit CurrentTo VSUP / 2Sink50mA
Output Source and Sink Current(VNEG_ , VPOS_, VOUT_) ≅ VSUP / 2,
|ΔVOS| < 10mV40mA
GATE-ON LINEAR-REGULATOR CONTROLLERFBP Regulation VoltageVFBPIDRVP = 100µA 1.218 1.269 V
