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MAX8728ETJ+-MAX8728ETJ+T
Low-Cost Multiple-Output Power Supply for LCD Monitors/TVs
General DescriptionThe MAX8728 generates all the supply rails for thin-film
transistor (TFT) liquid-crystal display (LCD) panels in TVs
and monitors. It includes step-down and step-up regula-
tors, positive and negative charge pumps, and a dual-
mode, logic-controlled high-voltage switch control block.
The MAX8728 can operate from input voltages from 7V to
13.2V and is optimized for LCD TV panel and LCD moni-
tor applications running directly from 12V supplies.
The step-up and step-down regulators feature internal
power MOSFETs and high-frequency operation allow-
ing the use of small inductors and capacitors, resulting
in a compact solution. Both switching regulators use
fixed-frequency, current-mode control architectures,
providing fast load-transient response and easy com-
pensation. The positive and negative charge-pump reg-
ulators provide TFT gate-driver supply voltages. Both
output voltages can be adjusted with external resistive
voltage-dividers.
The MAX8728 is available in a small (5mm x 5mm), low-
profile (0.8mm), 32-pin TQFN package and operates
over the -40°C to +85°C temperature range.
ApplicationsLCD MonitorsLCD TVs
FeaturesOptimized for 10.8V to 13.2V Input Supply7V to 13.2V Input Supply RangeSelectable Frequency (500kHz/1MHz/1.5MHz)Current-Mode Step-Down Regulator
14V Internal n-Channel MOSFET
1.5% Accurate Output Current-Mode Step-Up Regulator
19V Internal n-Channel MOSFET
1% Accurate Output
True Shutdown™(Output Goes to Zero)180°Out-of-Phase SwitchingAdjustable Positive/Negative Charge PumpsSoft-Start and Timer Delay Fault Latch for All
OutputsLogic-Controlled, High-Voltage Switches Power-Up and Power-Down SequencesThermal-Overload Protection
MAX8728
Low-Cost, Multiple-Output
Power Supply for LCD Monitors/TVs
Ordering InformationMAX8728
AVDD
VGON
GATEINL
VIN
OUT1
VGOFF
LX1ON/OFF
OUT1
FBI
FSEL
GND1
GND
FBP
SRCREF
VCCGON
DRN
MODE
THR
COMP
SHDN
LCD ENABLEEN
FROM TCONCTL
DEL
FB2
LX2
GND2
FBN
DRVN
SUPPDRVP
BST
VIN
Simplified Operating Circuit19-3910; Rev 0; 1/06
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-
PACKAGE
PACKAGE
CODEMAX8728ETJ+-40°C to +85°C32 TQFN-EP*
5mm x 5mmT3255-4
Pin ConfigurationMAX8728
TQFNTOP VIEW
OUT1
CTL
LX1BST
GND1
FB2DRNGONFBNSRCFSEL672422201918
MODE
DEL
FBP
REF
GND
SHDN
DRVN
THR10COMPVCC9FB1VL
GATE15GNDPLX216DRVP
INL
SUPP
GND2
+Denotes lead-free package.
*EP= Exposed pad.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
MAX8728
Low-Cost, Multiple-Output
Power Supply for LCD Monitors/TVs
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, VIN= VINL= VSUPP= 12V, VOUT1= +3.3V, VSRC= 28V, GND1 = GND2 = GNDP = GND = 0, IREF= 0, TA
= 0°C
to +85°C. Typical values are at TA= +25°C, unless otherwise noted.)
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.
IN, INL, SUPP to GND............................................-0.3V to +14V
SUPP to IN..........................................................................±0.3V
DRVP to GNDP.........................................-0.3V to VSUPP + 0.3V
CTL, EN, SHDN, OUT1, VL, VCCto GND................-0.3V to +6V
COMP, FB1, FB2, FBN, FBP, FSEL, DEL,
THR, MODE, REF to GND........................-0.3V to VCC + 0.3V
GND1, GND2, GNDP to GND.............................................±0.3V
BST to GND1..........................................................-0.3V to +20V
LX1 to BST................................................................-6V to +0.3V
LX2 to GND2..........................................................-0.3V to +19V
DRVN, LX1, GATE to GND1..........................-0.3V to VIN + 0.3V
GON, SRC to GND.................................................-0.3V to +40V
SRC to GON...........................................................-0.3V to +40V
SRC to SUPP..........................................................-0.3V to +30V
SRC to SUPP (momentary)......................................-14V to +30V
GON to SUPP..........................................................-14V to +30V
SRC to DRN............................................................-0.3V to +40V
DRN to GND...........................................................-0.3V to +40V
GON to DRN...........................................................-0.3V to +30VShort Circuit to GND..............................................Momentary
REF Short Circuit to GND...........................................Continuous
DRVN RMS Current..........................................................-400mA
DRVP RMS Current.........................................................+100mA
LX2 RMS Current................................................................+1.6A
GND2 RMS Current............................................................+1.6A
LX1 RMS Current.................................................................-1.6A
Continuous Power Dissipation (TA= +70°C)
32-Pin Thin QFN (derate 34.5mW/°C above +70°C).....2758mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
GENERALIN, INL Input Voltage RangeFor VL regulator operation7.012.013.2V
INL Quiescent CurrentVFB2 = VFBP = 2.2V, VFBN = 0,
LX2 not switching, LX1 switching7mA
IN Standby Supply CurrentVIN = 7V to 13.2V, EN = SHDN = GND0.5mA
FSEL = GND127515001730
FSEL = VCC85010001150Switching Frequency
FSEL = REF425530610
kHz
Phase Difference Between
Step-Down/Positive and
Step-Up/Negative Regulators
180Degrees
VL REGULATORVL Output Voltage7V < VINL < 13.2V, VFB1 = VFB2 = VFBP =
1.9V, VFBN = 0.5V, IVL = 25mA4.85.05.1V
VL Undervoltage Lockout
ThresholdVL rising, 2.5% hysteresis3.84.04.1V
REFERENCEREF Output VoltageNo external load1.982.002.02V
REF Load Regulation0 < IREF < 50µA10mV
REF Sink CurrentREF in regulation010µA
REF Undervoltage Lockout
ThresholdRising edge, 200mV hysteresis1.5V
MAX8728
Low-Cost, Multiple-Output
Power Supply for LCD Monitors/TVs
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VIN= VINL= VSUPP= 12V, VOUT1= +3.3V, VSRC= 28V, GND1 = GND2 = GNDP = GND = 0, IREF= 0, TA
= 0°C
to +85°C. Typical values are at TA= +25°C, unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
STEP-DOWN REGULATOROUT1 Voltage in Fixed ModeVIN = 7.0V to 13.2V, EN = VCC,
ILOAD = 0.5A (Note 1)3.253.303.35V
FB1 Regulation Voltage in
Adjustable Modes
20% to 35% duty cycle, EN = VCC,
ILOAD = 0.5A (Note 1)1.972.002.03V
FB1 Adjustable Mode Threshold
Voltage0.100.150.20V
Output Voltage Adjust Range2.03.6V
Fixed mode, OUT1 falling2.640Step-Down Regulator Fault Trip
LevelAdjustable mode, FB1 falling1.5361.6001.664V
FB1 Input Leakage CurrentVFB1 = 2.1V-100+100nA
Low-Frequency Operation
OUT1 ThresholdLX1 only1.3V
FSEL = GND250
FSEL = VCC167Low-Frequency Operation
Switching FrequencyLX1 only
FSEL = REF83
kHz
DC Load Regulation0 < IOUT1 < 2A, EN = VCC0.5%
DC Line Regulation7V
LX1-to-IN Switch
On-Resistance200300mΩ
LX1-to-GND1 Switch
On-Resistance102240Ω
Positive Current Limit2.52.83.1A
Skip Mode IMAX ThresholdEN = GND0.500.600.75A
Soft-Start Ramp Time1.7ms
Maximum Duty Cycle707785%
STEP-UP REGULATOROutput Voltage Range VIN 17 V
Maximum Duty Cycle657585%
Minimum On-Time65100ns
FB2 Regulation VoltageFB2 = COMP, CCOMP = 1nF1.982.002.02V
FB2 Fault Trip LevelFalling edge1.7281.8001.872V
FB2 Load Regulation0 < IAVDD < full, transient only-1%
FB2 Line RegulationVIN = 10.8V to 13.2V0.080.15%/V
FB2 Input Bias CurrentVFB2 = 2V-150+150nA
FB2 Transconductance∆I = ±2.5µA at COMP, FB2 = COMP75160280µS
FB2 Voltage GainFB2 to COMP700V/V
LX2 Leakage CurrentVFB2 = 2.1V, VLX2 = 13V440µA
LX2 Current LimitVFB2 = 1.8V, duty cycle is 25%1.21.51.8A
MAX8728
Low-Cost, Multiple-Output
Power Supply for LCD Monitors/TVs
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN= VINL= VSUPP= 12V, VOUT1= +3.3V, VSRC= 28V, GND1 = GND2 = GNDP = GND = 0, IREF= 0, TA= 0°C
to +85°C. Typical values are at TA= +25°C, unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
Current-Sense Transresistance0.61.21.8V/A
LX2 On-Resistance0.51.0 ΩSoft-Start Period3ms
POSITIVE CHARGE-PUMP REGULATOR
FBP Regulation Voltage1.982.002.02V
FBP Line Regulation ErrorVIN = VSUPP = 10.8V to 13.2V6mV
FBP Input Bias CurrentVFBP = 2.1V-50+50nA
DRVP p-Channel MOSFET
On-Resistance4Ω
DRVP n-Channel MOSFET
On-Resistance1Ω
FBP Fault Trip Level Falling edge1.5361.6001.664VPositive Charge-Pump Soft-Start
Period 3ms
NEGATIVE CHARGE-PUMP REGULATOR
FBN Regulation VoltageVREF - VFBN1.7271.7501.773V
FBN Input Bias CurrentVFBN = 250mV-50+50nA
FBN Line RegulationVIN = 10.8V to 13.2V6mV
DRVN p-Channel MOSFET
On-Resistance4ΩDRVN n-Channel MOSFET
On-Resistance1Ω
FBN Fault Trip Level Rising edge600mVNegative Charge-Pump
Soft-Start Period 3ms
SEQUENCE CONTROL
SHDN Input Low Voltage0.4V
SHDN Input High Voltage2V
SHDN Input Current1µA
EN Charge CurrentDuring startup, VEN = 1.0V456µAEN Turn-On Threshold0.951.001.05V
DEL Capacitor Charge CurrentDuring startup, VDEL = 1.0V456µADEL Turn-On Threshold0.951.001.05V
GATE Output Sink CurrentEN = high, GATE = IN81114µA
GATE On VoltageEN = highVIN - 6VIN - 5VIN - 4V
GATE Done ThresholdEN = high, VGATE_DONE - VGATE_ ON01V
GATE Pullup ResistanceEN = low, VGATE = VIN - 5V1kΩ
MAX8728
Low-Cost, Multiple-Output
Power Supply for LCD Monitors/TVs
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN= VINL= VSUPP= 12V, VOUT1= +3.3V, VSRC= 28V, GND1 = GND2 = GNDP = GND = 0, IREF= 0, TA= 0°C
to +85°C. Typical values are at TA= +25°C, unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
DEL, EN Discharge Switch
On-ResistanceSHDN = low or fault tripped20Ω
FBN Discharge Switch
On-ResistanceEN = low or fault tripped5kΩ
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES
CTL Input Low Voltage0.6V
CTL Input High Voltage2.0V
CTL Input Leakage Current-1+1µA
CTL-to-GON Rising Propagation
Delay
1kΩ from DRN to GND, 1.5nF from GON to
GND100ns
CTL-to-GON Falling Propagation
Delay
1kΩ from DRN to GND, 1.5nF from GON to
GND250ns
SRC Input Voltage Range38V
VMODE = VREF, VDEL = VCTL = 3V1.52.0SRC Input CurrentVMODE = VREF, VDEL = 3V, VCTL = 00.140.20mA
DRN Input CurrentVMODE = VREF, VDRN = 8V, VDEL = 3V,
VGON > VDRN, VCTL = 001µA
SRC Switch On-ResistanceVMODE = VREF, VDEL = VCTL = 3V1530Ω
SRC Switch Saturation CurrentVMODE = VREF, VDEL = VCTL = 3V,
VSRC - VGON > 5V260mA
DRN Switch
On-Resistance
VMODE = VREF, VDEL = 3V, VCTL = 0, VGON
= 28V, VTHR = 1.4V2550Ω
DRN Switch Saturation CurrentVMODE = VREF, VDEL = 3V, VCTL = 0, VGON
= 28V, VTHR = 1.4V, VGON - VDRN > 5V100mA
MODE Switch On-ResistanceSHDN = GND1kΩ
MODE Current-Source Stop
Voltage ThresholdMODE rising1.21.41.6V
MODE Charge CurrentOperating mode 2, VMODE = 0.7V405060µA
MODE Voltage ThresholdEnabling DRN switch control in mode 20.81.01.2V
THR to GON Voltage Gain9.410.010.6V/V
FAULT DETECTIONDuration to Trigger Fault 50 ms
Thermal Shutdown Threshold15°C typical hysteresis+160°C
SWITCHING-FREQUENCY SELECTION
FSEL = VCC (1MHz)VCC - 0.4
FSEL = REF (0.5MHz)1.652.35FSEL Input Levels
FSEL = GND (1.5MHz)0.5
FSEL Input CurrentForced to VCC10µA
