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MAX17114ETM+CB2
Multi-Output Power Supply with VCOM Amplifier and High-Voltage Gamma Reference for LCD TVs
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
General Description
The MAX17114 generates all the supply rails for thin-film
transistor liquid-crystal display (TFT LCD) TV panels
operating from a regulated 12V input. It includes a step-
down and a step-up regulator, a positive and a negative
charge pump, an operational amplifier, a high-accuracy,
high-voltage gamma reference, and a high-voltage
switch control block. The MAX17114 can operate from
input voltages from 8V to 16.5V and is optimized for an
LCD TV panel running directly from 12V supplies.
The step-up and step-down switching regulators feature
internal power MOSFETs and high-frequency opera-
tion allowing the use of small inductors and capacitors,
resulting in a compact solution. The step-up regulator
provides TFT source driver supply voltage, while the
step-down regulator provides the system with logic sup-
ply voltage. Both regulators use fixed-frequency current-
mode control architectures, providing fast load-transient
response and easy compensation. A current-limit func-
tion for internal switches and output-fault shutdown pro-
tects the step-up and step-down power supplies against
fault conditions. The MAX17114 provides soft-start func-
tions to limit inrush current during startup. In addition,
the MAX17114 integrates a control block that can drive
an external p-channel MOSFET to sequence power to
source drivers.
The positive and negative charge-pump regulators pro-
vide TFT gate-driver supply voltages. Both output volt-
ages can be adjusted with external resistive voltage-
dividers. A logic-controlled, high-voltage switch block
allows the manipulation of the positive gate-driver supply.
The MAX17114 includes one high-current operational
amplifier designed to drive the LCD backplane (VCOM).
The amplifier features high output current (Q200mA), fast
slew rate (45V/Fs), wide bandwidth (20MHz), and rail-to-
rail outputs.
Also featured in the MAX17114 is a high-accuracy, high-
voltage adjustable reference for gamma correction.
The MAX17114 is available in a small (7mm x 7mm),
ultra-thin (0.8mm), 48-pin, TQFN-EP package and oper-
ates over the -40NC to +85NC temperature range.
Applications
LCD TV Panels
Features8.0V to 16.5V IN Supply-Voltage RangeSelectable Frequency (500kHz/750kHz)Current-Mode Step-Up Regulator
Fast Load-Transient Response
High-Accuracy Output Voltage (1.0%)
Built-In 20V, 3.5A, 100mI MOSFET
High Efficiency
Adjustable Soft-Start
Adjustable Current Limit
Low Duty-Cycle Operation (13.2VIN - 13.5V AVDD)Current-Mode Step-Down Regulator
Fast Load-Transient Response
Built-In 20V, 3.2A, 120mI MOSFET
High Efficiency
3ms Internal Soft-StartAdjustable Positive Charge-Pump RegulatorAdjustable Negative Charge-Pump RegulatorIntegrated High-Voltage Switch with Adjustable
Turn-On DelayHigh-Speed Operational Amplifier
±200mA Short-Circuit Current
45V/µs Slew RateHigh-Accuracy Reference for Gamma Buffer
±0.5% Feedback Voltage
Up to 30mA Load Current
Low-Dropout Voltage 0.5V at 60mAExternal p-Channel Gate Control for AVDD
SequencingXAO ComparatorInput Undervoltage-Lockout and Thermal-
Overload Protection48-Pin, 7mm x 7mm, Thin QFN Package
19-4820; Rev 0; 7/09
Pin Configuration and Simplified Operating Circuit appear
at end of data sheet.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
EVALUATION KIT
AVAILABLE
Ordering Information
PARTTEMP RANGEPIN-PACKAGE
MAX17114ETM+-40NC to +85NC48 TQFN-EP*
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
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.
INVL, IN2, VOP, EN, FSEL to GND .......................-0.3V to +24V
PGND, OGND, CPGND to GND ..........................-0.3V to +0.3V
DLY1, GVOFF, THR, VL to GND ..........................-0.3V to +7.5V
VREF_0, VREF_I, FBP, FBN, FB1, FB2, COMP, SS, CLIM,
XAO, VDET, VREF_FB, OUT to GND .........-0.3V to (VL + 0.3)
GD, GD_I to GND ..................................................-0.3V to +24V
LX1 to PGND .........................................................-0.3V to +24V
OPP, OPN, OPO to OGND .......................-0.3V to (VOP + 0.3V)
DRVP to CPGND ....................................-0.3V to (SUPP + 0.3V)
DRVN to CPGND ....................................-0.3V to (SUPN + 0.3V)
LX2 to PGND ................................................-0.7 to (IN2 + 0.3V)
SUPN to GND .............................................-0.3V to (IN2 + 0.3V)
SUPP to GND ..........................................-0.3V to (GD_I + 0.3V)
BST to VL ...............................................................-0.3V to +30V
VGH to GND ..........................................................-0.3V to +40V
VGHM, DRN to GND ................................-0.3V to (VGH + 0.3V)
VGHM to DRN .......................................................-0.3V to +40V
VREF_I to GND ......................................................-0.3V to +24V
VREF_O to GND ...................................-0.3V to (VREF_I + 0.3V)
REF Short Circuit to GND ..........................................Continuous
RMS LX1 Current (total for both pins) ..................................3.2A
RMS PGND Current (total for both pins) ..............................3.2A
RMS IN2 Current (total for both pins) ..................................3.2A
RMS LX2 Current (total for both pins) ..................................3.2A
RMS DRVN, DRVP Current ..................................................0.8A
RMS VL Current ..................................................................50mA
Continuous Power Dissipation (TA = +70NC)
48-Pin TQFN (derate 38.5mW/NC above +70NC) ....3076.9mW
Operating Temperature Range ..........................-40NC to +85NC
Junction Temperature .....................................................+160NC
Storage Temperature Range ............................-65NC to +165NC
Lead Temperature (soldering, 10s) ..................................+300N
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VINVL = VIN2 = VIN = 12V, VOPO = VAVDD = 15V, TA = 0°C to +85°C. Typical values are at TA = +25NC,
unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS
PARAMETERCONDITIONSMINTYPMAXUNITS
GENERAL
INVL, IN2 Input-Voltage Range816.5V
INVL + IN2 Quiescent CurrentOnly LX2 switching (VFB1 = VFBP = 1.5V, VFBN = 0V),
EN = VL, VFSEL = 1V1020mA
INVL + IN2 Standby CurrentLX2 not switching (VFB1 = VFB2 = VFBP = 1.5V,
VFBN = 0V), EN = VL, VFSEL = high25mA
SMPS Operating FrequencyFSEL = INVL or high impedance630750870kHzFSEL = GND420500580
INVL Undervoltage-Lockout
ThresholdINVL rising, 200mV typical hysteresis6.07.08.0V
VL REGULATOR
VL Output VoltageIVL = 25mA, VFB1 = VFB2 = VFBP = 1.1V, VFBN = 0.4V
(all regulators switching)4.85955.15V
VL Undervoltage-Lockout
ThresholdVL rising, 50mV typical hysteresis3.53.94.3V
REFERENCE
REF Output VoltageNo external load1.23751.2501.2625V
REF Load Regulation0A < ILOAD < 50FA10mV
REF Sink CurrentIn regulation10FA
REF Undervoltage-Lockout
ThresholdRising edge, 250mV typical hysteresis1.01.2V
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VINVL = VIN2 = VIN = 12V, VOPO = VAVDD = 15V, TA = 0°C to +85°C. Typical values are at TA = +25NC,
unless otherwise noted.)
Dual Mode is a trademark of Maxim Integrated Products, Inc.
PARAMETERCONDITIONSMINTYPMAXUNITS
STEP-DOWN REGULATOR
OUT Voltage in Fixed ModeFB2 = GND, no load (Note 1)0°C < TA < +85°C 3.253.303.35VTA = +25NC3.2673.333
FB2 Voltage in Adjustable ModeOUT = 2.5V, no load (Note 1)0°C < TA < +85°C 1.231.251.27VTA = +25NC1.23751.2625
FB2 Adjustable-Mode Threshold
VoltageDual Mode™ comparator0.100.150.20V
Output Voltage-Adjust Range1.55V
FB2 Fault-Trip LevelFalling edge 0.961.01.04V
FB2 Input Leakage CurrentVFB2 = 1.5V 50125200nA
DC Load Regulation0A < ILOAD < 2A0.5%
DC Line RegulationNo load, 10.8V < IN2 < 13.2V0.1%/V
LX2-to-IN2 nMOS Switch
On-Resistance100200mI
LX2-to-GND2 nMOS Switch
On-Resistance61023I
BST-to-VL pMOS Switch
On-Resistance4030110I
Low-Frequency Operation
Out ThresholdLX2 only0.8V
Low-Frequency Operation
Switching Frequency
FSEL = INVL125kHzFSEL = GND83
LX2 Positive Current Limit2.503.203.90A
Soft-Start Ramp TimeZero to full limit3ms
Maximum Duty Factor707885%
Minimum Duty Factor
Characterization/Design
Limit Only%
STEP-UP REGULATOR
Output-Voltage RangeVIN20V
Oscillator Maximum Duty Cycle697581%
FB1 Regulation VoltageFB1 = COMP, CCOMP = 1nF1.23751.251.2625V
FB1 Fault-Trip LevelFalling edge 0.961.01.04V
FB1 Load Regulation0A < ILOAD < full0.5%
FB1 Line Regulation10.8V < VIN < 13.2V0.08%/V
FB1 Input-Bias CurrentVFB1 = 2V30125200nA
FB1 TransconductanceDI = Q2.5FA at COMP, FB1 = COMP150320560FS
FB1 Voltage GainFB1 to COMP1400V/V
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VINVL = VIN2 = VIN = 12V, VOPO = VAVDD = 15V, TA = 0°C to +85°C. Typical values are at TA = +25NC,
unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
LX1 Leakage Current
VFB1 = 1.5V, VLX1 = 20V1040
VFB1 = 1.1V, RCLIM = floating3.03.54.2
VFB1 = 1.1V, with RCLIM at CLIM pin-20%
3.5 -
(60.5kI/
RCLIM)
+20%
CLIM VoltageRCLIM = 60.5kI0.560.6250.69V
Current-Sense Transresistance0.190.210.25V/A
LX1 On-Resistance100185mI
Soft-Start PeriodCSS < 200pF16ms
SS Charge CurrentVSS = 1.2V456FA
POSITIVE CHARGE-PUMP REGULATORS
GD_I Input-Supply Range8.020V
GD_I Input-Supply CurrentVFBP = 1.5V (not switching)0.150.3mA
GD_I Overvoltage ThresholdGD_I rising, 250mV typical hysteresis (Note 2)20.12122V
FBP Regulation Voltage1.23751.251.2625V
FBP Line-Regulation ErrorVSUP = 11V to 16V, not in dropout0.2%/V
FBP Input-Bias CurrentVFBP = 1.5V, TA = +25°C-50+50nA
DRVP p-Channel MOSFET
On-Resistance1.53I
DRVP n-Channel MOSFET
On-Resistance12I
FBP Fault-Trip LevelFalling edge 0.961.01.04V
Positive Charge-Pump
Soft-Start Period
7-bit voltage ramp with filtering to prevent high peak
currents at 500kHz frequency4ms
750kHz frequency3ms
NEGATIVE CHARGE-PUMP REGULATORS
FBN Regulation VoltageVREF - VFBN0.991.001.01V
FBN Input-Bias CurrentVFBN = 0mV-50+50nA
FBN Line-Regulation ErrorVIN2 = 11V to 16V, not in dropout0.2%/V
DRVN PCH On-Resistance1.53I
DRVN NCH On-Resistance12I
FBN Fault-Trip LevelRising edge720800880mV
Negative Charge-Pump Soft-
Start Period
7-bit voltage ramp with filtering to prevent high peak
currents at 500kHz frequency3ms
750kHz frequency2
AVDD SWITCH GATE CONTROL
GD to GD_I Pullup ResistanceEN = GND2550I
GD Output Sink CurrentEN = VL81015FAGD_I - GD Done ThresholdEN = VL, VGD_I - VGD567
OPERATIONAL AMPLIFIERS
VOP Supply Range820V
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VINVL = VIN2 = VIN = 12V, VOPO = VAVDD = 15V, TA = 0°C to +85°C. Typical values are at TA = +25NC,
unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
VOP Overvoltage-Fault
ThresholdVVOP = rising, hysteresis = 200mV (Note 2)20.12122V
VOP Supply CurrentBuffer configuration, VOPP = VOPN = VOP/2, no load24mA
Input-Offset Voltage2V < (VOPP, VOPN ) < (VVOP - 2V), TA = +25NC-10-2+6mV
Input-Bias Current2V < (VOPP, VOPN ) < (VVOP - 2V)-1+1FA
Input Common-Mode
Voltage Range0VOPV
Input Common-Mode
Rejection Ratio2V < (VOPP, VOPN ) < (VVOP - 2V)80dB
Output-Voltage Swing HighIOUTx = 25mAVOP -
VOP -
150mV
Output-Voltage Swing LowIOUTx = -25mA150300mV
Large-Signal Voltage Gain2V < (VOPP, VOPN ) < (VOP - 2V)80dB
Slew Rate2V < (VOPP, VOPN ) < (VOP - 2V)45V/Fs
-3dB Bandwidth2V < (VOPP, VOPN ) < (VOP - 2V)20MHz
Short-Circuit CurrentShort to VOP/2, sourcing200mAShort to VOP/2, sinking200
HIGH-VOLTAGE SWITCH ARRAY
VGH Supply Range35V
VGH Supply Current150300FA
VGHM-to-VGH Switch
On-ResistanceDLY1 = 2V, GVOFF = VL510I
VGHM-to-VGH Switch Saturation
CurrentVVGH - VVGHM > 5V150390mA
VGHM-to-DRN Switch
On-ResistanceDLY1 = 2V, GVOFF = GND2050I
VGHM-to-DRN Switch Saturation
CurrentVVGHM - VDRN > 5V75200mA
VGHM-to-GND Switch
On-ResistanceDLY1 = GND1.02.54.0kI
GVOFF Input Low Voltage0.6V
GVOFF Input High Voltage1.6V
GVOFF Input CurrentGVOFF = 0V or VL-1+1FA
GVOFF-to-VGHM Rising
Propagation Delay
1kI from DRN to CPGND, GVOFF = 0V to VL step, no
load on VGHM, measured from GVOFF = 2V to VGHM
= 20%
100ns
GVOFF-to-VGHM Falling
Propagation Delay
1kI from DRN to CPGND, GVOFF = VL to 0V step, no
load on VGHM, DRN falling, no load on DRN and VGHM,
measured from GVOFF = 0.6V to VGHM = 80%
200ns
THR-to-VGHM Voltage Gain9.41010.6V/V
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VINVL = VIN2 = VIN = 12V, VOPO = VAVDD = 15V, TA = 0°C to +85°C. Typical values are at TA = +25NC,
unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
SEQUENCE CONTROL
EN Pulldown Resistance1MI
DLY1 Charge CurrentVDLY1 = 1; when DLY1 cap is not used, there is no delay6810FA
DLY1 Turn-On Threshold1.191.251.31V
DLY1 Discharge Switch
On-ResistanceEN = GND or fault tripped10I
FBN Discharge Switch
On-Resistance(EN = GND and INVL < UVLO) or fault tripped3kI
GAMMA REFERENCE
VREF_I Input-Voltage Range1018.0V
VREF_I Undervoltage LockoutVREF_I rising5.45.8V
VREF_I Input Bias CurrentNo load125250FA
VREF_O Dropout VoltageIVREF_O = 60mA0.250.5V
VREF_B Regulation VoltageVVREF_I = 13.5V, 1mA P IVREF_O P 30mA1.2431.2501.256V
VVREF_I from 10V to 18V, IVREF_O = 20mAP 0.9mV/V
VREF_O Maximum Output Current60mA
XAO FUNCTION
VDET ThresholdVDET falling, IN > VL UVLO1.2251.2501.275V
VDET Hysteresis50mV
VDET Input Bias Current50175300nA
XAO Output VoltageVDET = AGND, IXAO = 1mA0.4V
FAULT DETECTION
Duration-to-Trigger FaultFor UVP only50ms
Step-Up Short-Circuit ProtectionFB1 falling edge0.36 x
VREF
0.4 x
VREF
0.44 x
VREFV
Step-Down Short-Circuit
Protection
Adjustable mode FB2 falling0.18 x
VREF
0.2 x
VREF
0.22 x
VREFVFixed mode OUT falling, internal feedback divider
voltage
0.18 x
VREF
0.2 x
VREF
0.22 x
VREF
Positive Charge-Pump Short-
Circuit ProtectionFBP falling edge0.36 x
VREF
0.4 x
VREF
0.44 x
VREFV
Negative Charge-Pump
Short-Circuit ProtectionVFBN - VREF0.40.450.5V
Thermal-Shutdown ThresholdLatch protection+160NC
SWITCHING FREQUENCY SELECTION
FSEL Input Low Voltage500kHz 0.6V
FSEL Input High Voltage750kHz1.6V
FSEL Pullup Resistance1MI
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
ELECTRICAL CHARACTERISTICS
(VINVL = VIN2 = VIN = 12V, VOPO = VAVDD = 15V, TA = -40°C to +85°C.) (Note 3)
PARAMETERCONDITIONSMINTYPMAXUNITS
GENERAL
INVL, IN2 Input-Voltage Range816.5V
SMPS Operating FrequencyFSEL = INVL or high impedance630870kHzFSEL = GND420580
INVL Undervoltage-Lockout
ThresholdINVL rising, 200mV typical hysteresis6.08.0V
VL REGULATOR
VL Output VoltageIVL = 25mA, VFB1 = VFB2 = VFBP = 1.1V, VFBN = 0.4V
(all regulators switching)4.8595.15V
VL Undervoltage-Lockout
ThresholdVL rising, 100mV typical hysteresis3.54.3V
REFERENCE
REF Output VoltageNo external load1.2351.265V
REF Undervoltage-Lockout
ThresholdRising edge, 20mV typical hysteresis1.2V
STEP-DOWN REGULATOR
OUT Voltage in Fixed ModeFB2 = GND, no load (Note 1)3.2673.333V
FB2 Voltage in Adjustable ModeVOUT = 2.5V, no load (Note 1)1.23751.2625V
FB2 Adjustable-Mode
Threshold VoltageDual-mode comparator0.100.20V
Output Voltage-Adjust RangeStep-down output1.55V
FB2 Fault Trip LevelFalling edge0.961.04V
LX2-to-IN2 nMOS Switch
On-Resistance200mI
LX2-to-GND2 nMOS Switch
On-Resistance623I
BST-to-VL pMOS Switch
On-Resistance40110I
LX2 Positive Current Limit2.503.90A
Maximum Duty Factor7085%
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
ELECTRICAL CHARACTERISTICS (continued)
(VINVL = VIN2 = VIN = 12V, VOPO = VAVDD = 15V, TA = -40°C to +85°C.) (Note 3)
PARAMETERCONDITIONSMINTYPMAXUNITS
STEP-UP REGULATOR
Output-Voltage RangeVIN20V
Oscillator Maximum Duty Cycle7085%
FB1 Regulation VoltageFB1 = COMP, CCOMP = 1nF1.23751.2625V
FB1 Fault-Trip LevelFalling edge0.961.04V
FB1 TransconductanceDI = Q2.5FA at COMP, FB1 = COMP150560FS
LX1 Leakage CurrentVFB1 = 1.5V, VLX1 = 20V40FA
LX1 Current LimitVFB1 = 1.1V, RCLIM = unconnected3.04.2A
CLIM VoltageRCLIM = 60.5kI0.560.68V
Current-Sense Transresistance0.190.25V/A
LX1 On-Resistance185mI
SS Charge CurrentVSS = 1.2V46FA
POSITIVE CHARGE-PUMP REGULATORS
GD_I Input-Supply Range8.020V
GD_I Input-Supply CurrentVFBP = 1.5V (not switching)0.2mA
GD_I Overvoltage ThresholdGD_I rising, 250mV typical hysteresis (Note 2)20.122V
FBP Regulation Voltage1.23751.2625V
FBP Line-Regulation ErrorVSUP = 11V to 16V, not in dropout0.2%/V
DRVP p-Channel MOSFET
On-Resistance3I
DRVP n-Channel MOSFET
On-Resistance1I
FBP Fault-Trip LevelFalling edge0.961.04V
NEGATIVE CHARGE-PUMP REGULATORS
FBN Regulation VoltageVREF - VFBN0.991.01V
FBN Line-Regulation ErrorVIN2 = 11V to 16V, not in dropout0.2%/V
DRVN PCH On-Resistance3I
DRVN NCH On-Resistance1I
FBN Fault-Trip LevelRising edge720880mV
AVDD SWITCH GATE CONTROL
GD Output Sink CurrentEN = VL515FA
GD_I - GD Done ThresholdEN = VL, VGD_I - VGD57V
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
ELECTRICAL CHARACTERISTICS (continued)
(VINVL = VIN2 = VIN = 12V, VOPO = VAVDD = 15V, TA = -40°C to +85°C.) (Note 3)
PARAMETERCONDITIONSMINTYPMAXUNITS
OPERATIONAL AMPLIFIERS
VOP Supply Range820V
VOP Overvoltage Fault ThresholdVVOP = rising, hysteresis = 200mV (Note 2)20.122V
VOP Supply CurrentBuffer configuration, VOPP = VOPN = VOP/2, no load4mA
Input Offset Voltage2V < (VOPP, VOPN ) < (VOP - 2V), TA = +25NC-12+8mV
Input Common-Mode
Voltage Range0OVINV
Output-Voltage Swing HighIOUTx = 25mAVOP -
300mV
Output-Voltage Swing LowIOUTx = -25mA300mV
Short-Circuit CurrentShort to VOP/2, sourcing200mAShort to VOP/2, sinking200
HIGH-VOLTAGE SWITCH ARRAY
VGH Supply Range35V
VGH Supply Current3300FA
VGHM-to-VGH Switch
On-ResistanceVDLY1 = 2V, GVOFF = VL10I
VGHM-to-VGH Switch
Saturation CurrentVVGH - VVGHM > 5V150mA
VGHM-to-DRN Switch
On-ResistanceVDLY1 = 2V, GVOFF = GND50I
VGHM-to-DRN Switch
Saturation CurrentVVGHM - VDRN > 5V75mA
VGHM-to-GND Switch
On-ResistanceDLY1 = GND1.04.0kI
GVOFF Input Low Voltage0.6V
GVOFF Input High Voltage1.6V
GVOFF Input CurrentVGVOFF = 0V or VL-1+1FA
THR-to-VGHM Voltage Gain9.410.6V/V
SEQUENCE CONTROL
EN Input Low Voltage0.6V
EN Input High Voltage1.6V
DLY1 Charge CurrentVDLY1 = 1V; when DLY1 cap is not used,
there is no delay610FA
DLY1 Turn-On Threshold1.191.31V
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
ELECTRICAL CHARACTERISTICS (continued)
(VINVL = VIN2 = VIN = 12V, VOPO = VAVDD = 15V, TA = -40°C to +85°C.) (Note 3)
Note 1: When the step-down inductor is in continuous conduction (EN = VL or heavy load), the output voltage has a DC regulation
level lower than the error comparator threshold by 50% of the output-voltage ripple. In discontinuous conduction (EN = GND
with light load), the output voltage has a DC regulation level higher than the error comparator threshold by 50% of the output
voltage ripple.
Note 2: Disables boost switching if either GD_I or VOP exceeds the threshold. Switching resumes when no threshold is exceeded.
Note 3: Specifications to TA = -40NC are guaranteed by design, not production tested.
PARAMETERCONDITIONSMINTYPMAXUNITS
GAMMA REFERENCE
VREF_I Input-Voltage Range1018.0V
VREF_I Undervoltage LockoutVREF_I rising5.8V
VREF_I Input-Bias CurrentNo load250FA
VREF_O Dropout VoltageIVREF_O = 60mA0.5V
VREF_FB Regulation VoltageVREF_I = 13.5V, 1mA ≤ IVREF_O ≤ 30mA1.2431.256V
VREF_I from 10V to 18V, IVREF_O = 20mAP 0.9mV/V
VREF_O Maximum
Output Current60mA
XAO FUNCTION
VDET ThresholdVDET falling, IN > VL UVLO1.2251.275V
XAO Output VoltageVDET = AGND, IXAO = 1mA0.4V
FAULT DETECTION
Step-Up Short-Circuit
ProtectionFB1 falling edge0.36 x
VREF
0.44 x
VREFV
Step-Down Short-Circuit
Protection
Adjustable mode FB2 falling0.18 x
VREF
0.22 x
VREFV
Fixed mode OUT falling, internal feedback-divider
voltage
0.18 x
VREF
0.22 x
VREFV
Positive Charge-Pump
Short-Circuit ProtectionFBP falling edge0.36 x
VREF
0.44 x
VREFV
Negative Charge-Pump
Short-Circuit ProtectionVREF - VFBN0.40.5V
SWITCHING FREQUENCY SELECTION
FSEL Input Low Voltage500kHz0.6V
FSEL Input High Voltage750kHz1.6V
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114 Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
STEP-DOWN REGULATOR EFFICIENCY
vs. LOAD CURRENT
MAX17114 Toc01
LOAD CURRENT (A)
EFFICIENCY (%)
750kHz
500kHz
STEP-DOWN REGULATOR OUTPUT
VOLTAGE vs. LOAD CURRENT
MAX17114 Toc02
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
750kHz
500kHz
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT
MAX17114 Toc05
LOAD CURRENT (A)
EFFICIENCY (%)
750kHz
500kHz
STEP-UP REGULATOR OUTPUT
VOLTAGE vs. LOAD CURRENT
MAX17114 Toc06
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
750kHz
500kHz
STEP-DOWN REGULATOR LOAD-TRANSIENT
RESPONSE (0.3A TO 1.8A) MAX17114 toc03
VOUT
(AC-COUPLED)
200mV/div
IL2
1A/div
ILOAD
1A/div
20Fs/div
L = 4.7FH
STEP-DOWN REGULATOR HEAVY-LOAD
SOFT-START (1A) MAX17114 toc04VIN
5V/div
VOUT
1V/div0V
IL2
1A/div
LX2
10V/div
4ms/div
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX17114 Toc10
VIN (V)
SWITCHING FREQUENCY (kHz) 1210
GAMMA REFERENCE LINE REGULATION
(LOAD = 20mA)
MAX17114 Toc11-1
VOP VOLTAGE (V)
GAMMA REFERENCE VOLTAGE (V)
GAMMA REFERENCE LOAD
REGULATION (VREF = 16V)
MAX17114 Toc11-2
LOAD CURRENT (mA)
GAMMA REFERENCE VOLTAGE (V)
REFERENCE VOLTAGE
LOAD REGULATION
MAX17114 Toc11
LOAD CURRENT (FA)
REFERENCE VOLTAGE (V)
SWITCHING
NO SWITCHING
STEP-UP REGULATOR PULSED LOAD-TRANSIENT
RESPONSE (0.1A TO 1.9mA)MAX17114 toc08IL1
1A/div
10Fs/div
L = 10FH
VAVDD
(AC-COUPLED)
200mV/div
ILOAD
1A/div
STEP-UP REGULATOR HEAVY LOAD
SOFT-START (0.5A)MAX17114 toc09
IL1
1A/div
1ms/div
VAVDD
5V/div
VGD
5V/div
VEN
5V/div
STEP-UP REGULATOR LOAD-TRANSIENT
RESPONSE (0.1A TO 1.1mA) MAX17114 toc07IL1
1A/div
20Fs/div
L = 10FH
VAVDD
(AC-COUPLED)
200mV/div
ILOAD
1A/div
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
POSITIVE CHARGE-PUMP REGULATOR
NORMALIZED LINE REGULATION
MAX17114 Toc12
SUPPLY VOLTAGE (V)
GON
ERROR (%)161514131211
IGON = 0A
IGON = 25mA
POSITIVE CHARGE-PUMP REGULATOR
NORMALIZED LOAD REGULATION
MAX17114 Toc13
LOAD CURRENT (mA)
OUTPUT-CURRENT ERROR (%)
POSITIVE CHARGE-PUMP REGULATOR
LOAD-TRANSIENT RESPONSE
MAX17114 toc14
ILOAD
20mA/div
40Fs/div
VGON
(AC-COUPLED)
200mV/div
60mA
10mA
NEGATIVE CHARGE-PUMP REGULATOR
NORMALIZED LINE REGULATION
MAX17114 Toc15
SUPN VOLTAGE (V)
GOFF
ERROR (%)14131211109
IGON = 25mA
IGON = 0mA
NEGATIVE CHARGE-PUMP REGULATOR
NORMALIZED LOAD REGULATION
MAX17114 Toc16
LOAD CURRENT (mA)
OUTPUT-VOLTAGE ERROR (%)
NEGATIVE CHARGE-PUMP REGULATOR
LOAD-TRANSIENT RESPONSE
MAX17114 toc17
ILOAD
20mA/div
20Fs/div
VGOFF
(AC-COUPLED)
200mV/div
60mA
10mA
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
OPERATIONAL AMPLIFIER RAIL-TO-RAIL
INPUT/OUTPUT WAVEFORMSMAX17114 toc20
4Fs/div
VOPP
5V/div
VCOM
5V/div
OPERATIONAL AMPLIFIER
LOAD-TRANSIENT RESPONSEMAX17114 toc21
1Fs/div
VCOM
(AC-COUPLED)
500mV/div
IVCOM
100mA/div
OPERATIONAL AMPLIFIER LARGE-
SIGNAL STEP RESPONSEMAX17114 toc22
1Fs/div
VOPP
5V/div
VCOM
5V/div
OPERATIONAL AMPLIFIER SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX17114 toc19
VOP SUPPLY VOLTAGE (V)
VOP SUPPLY CURRENT (1817161514131211109
POWER-UP SEQUENCE OF ALL
SUPPLY OUTPUTS
MAX17114 toc18
10ms/div
VIN
VOUT
VGOFF
VAVDD
VGON
VCOM
VDLY1
VGHM
VIN = 10V/div
VOUT = 5V/div
VGOFF = 10V/div
VAVDD =10V/div
VGON = 20V/div
VCOM = 10V/div
VDLY1 = 5V/div
VGHM = 50V/div
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
INVL SUPPLY CURRENT vs. INPUT VOLTAGE
MAX17114 Toc24
INPUT VOLTAGE (V)
SUPPLY CURRENT (121016
ALL OUTPUT SWITCHING
NO OUTPUT SWITCHING
BUCK OUTPUT SWITCHING
OPERATIONAL AMPLIFIER SMALL-
SIGNAL STEP RESPONSEMAX17114 toc23
100ns/div
VOPP
(AC-COUPLED)
200mV/div
VCOM
(AC-COUPLED)
200mV/div
HIGH-VOLTAGE SWITCH CONTROL
FUNCTION (VGHM WITH 470pF LOAD)MAX17114 toc25
4Fs/div
VGVOFF
5V/div
VVGHM
10V/div
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
Pin Description
PINNAMEFUNCTIONVREF_IGamma Reference InputVOPOperational Amplifier Power SupplyOGNDOperational Amplifier Power GroundOPPOperational Amplifier Noninverting InputOPNOperational Amplifier Inverting InputOPOOperational Amplifier OutputXAOVoltage-Detector OutputGVOFFHigh-Voltage Switch-Control Block Timing Control Input. See the High-Voltage Switch Control sec-
tion for details.ENEnable Input. Enable is high, turns on step-up converter and positive charge pump.FB2
Step-Down Regulator Feedback Input. Connect FB2 to GND to select the step-down converter’s
3.3V fixed mode. For adjustable mode, connect FB2 to the center of a resistive voltage-divider
between the step-down regulator output (OUT) and GND to set the step-down regulator output
voltage. Place the resistive voltage-divider within 5mm of FB2.OUTStep-Down Regulator Output-Voltage Sense. Connect OUT to step-down regulator output.N.C.No Connection. Not internally connected.
13, 14LX2
Step-Down Regulator Switching Node. LX2 is the source of the internal n-channel MOSFET con-
nected between IN2 and LX2. Connect the inductor and Schottky catch diode to both LX2 pins
and minimize the trace area for lowest EMI.BSTStep-Down Regulator Bootstrap Capacitor Connection. Power supply for the high-side gate driver.
Connect a 0.1FF ceramic capacitor from BST to LX2.
16, 17IN2Step-Down Regulator Power Input. Drain of the internal n-channel MOSFET connected between
IN2 and LX2.GNDAnalog GroundVDETVoltage-Detector Input. Connects VDET to the center of a resistor voltage-divider between input
voltage and GND to set the trigger point of XAO.INVLInternal 5V Linear Regulator and the Startup Circuitry Power Supply. Bypass INVL to GND with
0.22FF close to the IC.VL
5V Internal Linear Regulator Output. Bypass VL to GND with a 1FF minimum capacitor. Provides
power for the internal MOSFET driving circuit, the PWM controllers, charge-pump regulators, logic,
and reference and other analog circuitry. Provides 25mA load current when all switching regula-
tors are enabled. VL is active whenever input voltage is high enough.FSELFrequency-Select Pin. Connect FSEL to VL or INVL or float FSEL pin for 750kHz operation.
Connect to GND for 500kHz operation.CLIMBoost Current-Limit Setting Input. Connects a resistor from CLIM to GND to set the current limit for
the boost converter.SS
Soft-Start Input. Connects a capacitor from SS to GND to set the soft-start time for the step-
up converter. A 5FA current source starts to charge CSS when GD is done (see the Step-Up
Regulator External pMOS Pass Switch section for a description). SS is internally pulled to GND
through 1kI resistance when EN is low OR when VL is below its UVLO threshold.
25, 26LX1Step-Up Regulator, Power-MOSFET, n-Channel Drain and Switching Node. Connects the inductor
and Schottky catch diode to both LX1 pins and minimizes the trace area for lowest EMI.
27, 28PGNDStep-Up Regulator Power GroundGD_IStep-Up Regulator, External pMOS Pass Switch Source Input. Connects to the cathode of the
step-up regulator Schottky catch diode.
Multi-Output Power Supply with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17114
Pin Description (continued)
PINNAMEFUNCTIONGDStep-Up Regulator, External pMOS Pass Switch Gate Input. A 10FA Q20% current source pulls
down on the gate of the external pFET when EN is high.FB1
Boost Regulator Feedback Input. Connects FB1 to the center of a resistive voltage-divider
between the boost regulator output and GND to set the boost regulator output voltage. Place the
resistive voltage-divider within 5mm of FB1.COMPCompensation Pin for the Step-Up Regulator Error Amplifier. Connects a series resistor and
capacitor from COMP to ground.THR
VGHM Low-Level Regulation Set-Point Input. Connects THR to the center of a resistive voltage-
divider between AVDD and GND to set the VGHM falling regulation level. The actual level is 10 x
VTHR. See the High-Voltage Switch Control section for details.SUPPPositive Charge-Pump Drivers Power Supply. Connects to the output of the boost regulator (AVDD)
and bypasses to CPGND with a 0.1FF capacitor. SUPP is internally connected to GD_I.CPGNDCharge-Pump and Buck Power GroundDRVPPositive Charge-Pump Driver Output. Connects DRVP to the positive charge-pump flying
capacitor(s).DLY1
High-Voltage Switch Array Delay Input. Connects a capacitor from DLY1 to GND to set the delay
time between when the positive charge pump finishes its soft-start and the startup of this high-volt-
age switch array. A 10FA current source charges CDLY1. DLY1 is internally pulled to GND through
50I resistance when EN is low or when VL is below its UVLO threshold.FBP
Positive Charge-Pump Regulator Feedback Input. Connects FBP to the center of a resistive
voltage-divider between the positive charge-pump regulator output and GND to set the positive
charge-pump regulator output voltage. Place the resistive voltage-divider within 5mm of FBP.VGHSwitch Input. Source of the internal high-voltage p-channel MOSFET between VGH and VGHM.VGHMInternal High-Voltage MOSFET Switch Common Terminal. VGHM is the output of the high-voltage
switch-control block.DRNSwitch Output. Drain of the internal high-voltage p-channel MOSFET connected to VGHM.SUPNNegative Charge-Pump Drivers Power Supply. Bypass to CPGND with a 0.1FF capacitor. SUPN is
internally connected to IN2.DRVNNegative Charge-Pump Driver Output. Connects DRVN to the negative charge-pump flying
capacitor(s).GNDAnalog GroundFBN
Negative Charge-Pump Regulator Feedback Input. Connect FBN to the center of a resistive
voltage-divider between the negative output and REF to set the negative charge-pump regulator
output voltage. Place the resistive voltage-divider within 5mm of FBN.REFReference Output. Connects a 0.22FF capacitor from REF to GND. All power outputs are disabled
until REF exceeds its UVLO threshold.VREF_FB
Gamma Reference Feedback Input. Connect VREF_FB to the center of a resistive voltage-divider
between VREF_O and GND to set the gamma reference output voltage. Place the resistive volt-
age-divider within 5mm of VREF_FB.VREF_OGamma Reference OutputEPExposed Pad. Connects EP to GND, and ties EP to a copper plane or island. Maximizes the area
of this copper plane or island to improve thermal performance.
