MAX8739ETP+-MAX8739ETP+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX8739ETP+-MAX8739ETP+T
TFT, LCD, DC-DC Converter with Operational Amplifiers
General Description
The MAX8739 includes a high-performance, step-up
regulator and two high-current operational amplifiers
for active-matrix thin-film transistor (TFT) liquid-crystal
displays (LCDs). The input supply voltage range of
the MAX8739 is from 1.8V to 5.5V. The device also
includes 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 (600kHz/1.2MHz) current-mode
regulator 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 two high-performance operational amplifiers are
designed to drive the LCD backplane (VCOM) and/or the
gamma-correction-divider string. The devices feature high
output current (±150mA), fast slew rate (7.5V/µs), wide
bandwidth (12MHz), and rail-to-rail inputs and outputs.
The MAX8739 is available in a 20-pin, 5mm x 5mm TQFN
package with a maximum thickness of 0.8mm for ultra-
thin LCD panels.
Applications●Notebook Computer Displays●LCD Monitor Panels
Features●1.8V to 5.5V Input Supply Range●600kHz/1.2MHz Current-Mode Step-Up Regulator Fast Transient Response to Pulsed Load High-Accuracy Output Voltage (1.5%) Built-In 14V, 1.9A, 0.2Ω n-Channel MOSFET High Eficiency (> 85%) Digital Soft-Start●Two High-Performance Operational Amplifiers ±150mA Output Short-Circuit Current 7.5V/µs Slew Rate 12MHz, -3dB Bandwidth Rail-to-Rail Inputs/Outputs●Logic-Controlled, High-Voltage Switch with Adjustable
Delay●Built-In Power-Up Sequence●Input Supply Undervoltage Lockout●Timer Delay Fault Latch for All Regulator Outputs●Thermal-Overload Protection
Pin Configuration appears at end of data sheet.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pads.
PARTTEMP RANGEPIN-PACKAGE
MAX8739ETP+-40°C to +85°C20 TQFN-EP*
MAX8739
AGND
PGND
COMP
LDO
DEL
NEG1
OUT1
NEG2
OUT2
POS1
POS2
SUP
CTL
DRN
COM
SRC
VMAIN
VIN
+1.8V TO +5.5V
TO VCOM
BACKPLANE
FREQ
FROM TCON
MAX8739TFT, LCD, DC-DC Converter with
Operational Amplifiers
Simpliied Operating Circuit
Ordering Information
EVALUATION KIT AVAILABLE
IN, CTL, FREQ, LDO to AGND ...............................-0.3V to +6V
COMP, FB, DEL to AGND ......................-0.3V to (VLDO + 0.3V)
PGND to AGND ..................................................................±0.3V
LX to PGND...........................................................-0.3V to +14V
SUP to AGND ........................................................-0.3V to +14V
POS1, POS2, NEG1, NEG2, OUT1,
OUT2 to AGND ...................................-0.3V to (VSUP + 0.3V)
SRC to AGND........................................................-0.3V to +30V
COM, DRN to AGND ..............................-0.3V to (VSRC + 0.3V)
COM RMS Output Current ...............................................±50mA
OUT1, OUT2 Maximum Continuous Output Current .......±75mA
LX Switch Maximum Continuous RMS Output Current .......1.6A
Continuous Power Dissipation (TA = +70°C)
20-Pin, 5mm x 5mm, TQFN (derate 20.8mW/°C
above +70°C) ............................................................1667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .........................................................+150°
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
(VIN = 2.5V, VSUP = 10V, VSRC = 28V, FREQ = CTL = IN, PGND = AGND = 0, TA = 0°C to +85°C. Typical values are at TA = +25°C,
unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
IN Supply Range1.85.5V
IN Quiescent Current VIN = 2.5V, VFB = 1.5V1530µA
IN Undervoltage Lockout
ThresholdIN rising, 200mV hysteresis1.301.75V
LDO Output Voltage6V ≤ VSUP ≤ 13V, ILDO = 12.5mA 4.655.4V
LDO Undervoltage Lockout
ThresholdLDO rising, 200mV hysteresis2.42.73.0V
LDO Output Current15mA
SUP Supply Voltage Range4.513.0V
SUP Undervoltage Fault
Threshold1.4V
SUP Supply CurrentVPOS_ = 4V, no load
LX not switching1.83.0LX switching1630
Thermal ShutdownRising edge, 15°C hysteresis+160°C
STEP-UP REGULATOR
Operating FrequencyFREQ = AGND512600768kHzFREQ = IN102012001380
Maximum Duty CycleFREQ = AGND919599%FREQ = IN889296
FREQ Input Low VoltageVIN = 1.8V to 5.5V0.6V
FREQ Input High VoltageVIN = 1.8V to 2.4V1.4VVIN = 2.4V to 5.5V2.0
FREQ Pulldown CurrentVFREQ = 1.0V3.55.06.0µA
FB Regulation VoltageISWITCH = 200mA1.2251.2401.255V
FB Fault Trip LevelFalling edge0.961.001.04V
Duration to Trigger Fault
FREQ = AGND 435164ms
MAX8739TFT, LCD, DC-DC Converter with Operational Ampliiers
Absolute Maximum Ratings
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 = 2.5V, VSUP = 10V, VSRC = 28V, FREQ = CTL = IN, PGND = AGND = 0, TA = 0°C to +85°C. Typical values are at TA = +25°C,
unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
FB Load Regulation0 < ILOAD < 200mA, transient only-1%
FB Line Regulation VIN = 1.8V to 5.5V-0.15-0.08+0.15%/V
FB Input Bias CurrentVFB = 1.3V125200nA
FB TransconductanceDICOMP = 5µA 75160280µS
FB Voltage GainFB to COMP700V/V
LX On-ResistanceILX = 200mA200400mΩ
LX Leakage CurrentVLX = VSUP = 13V0.0120µA
LX Current LimitVFB = 1.1V, duty cycle = 65%1.51.92.3A
Current-Sense Transresistance0.220.360.50V/A
Soft-Start PeriodFREQ = AGND 13msFREQ = IN14
Soft-Start Step Size0.24A
OPERATIONAL AMPLIFIERS
Input Offset VoltageVCM = VSUP/2, TA = +25°C012mV
Input Bias CurrentNEG1, POS1, NEG2, POS2-50+1+50nA
Input Common-Mode Voltage
RangeNEG1, POS1, NEG2, POS20VSUPV
Common-Mode Rejection Ratio0 ≤ VNEG_, VPOS_ ≤ VSUP5090dB
Open-Loop Gain125dB
Output Voltage Swing High
IOUT_ = 100µAVSUP -
VSUP
- 2mV
IOUT_ = 5mAVSUP -
VSUP -
Output Voltage Swing LowIOUT_ = -100µA215mVIOUT_ = -5mA80150
Short-Circuit CurrentTo VSUP/2Source50150mASink50140
Output Source-and-Sink CurrentBuffer coniguration, VPOS_ = 4V, |DVOS| < 10mV40mA
Power-Supply Rejection RatioDC, 6V ≤ VSUP ≤ 13V, VPOS_, VNEG_ = VSUP/260100dB
Slew Rate7.5V/µs
-3dB BandwidthRL = 10kΩ, CL = 10pF, buffer coniguration12MHz
Gain-Bandwidth ProductBuffer coniguration8MHz
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES
DEL Capacitor Charge CurrentDuring startup, VDEL = 1V456µA
DEL Turn-On Threshold1.1781.241.302V
DEL Pin Discharge Switch On-
ResistanceDuring UVLO, VIN = 1.3V20Ω
MAX8739TFT, LCD, DC-DC Converter with Operational Ampliiers
Electrical Characteristics (continued)
(VIN = 2.5V, VSUP = 10V, VSRC = 28V, FREQ = CTL = IN, PGND = AGND = 0, TA = 0°C to +85°C. Typical values are at TA = +25°C,
unless otherwise noted.)
(VIN = 2.5V, VSUP = 10V, VSRC = 28V, FREQ = CTL = IN, PGND = AGND = 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
IN Supply Range1.85.5V
IN Quiescent Current VIN = 2.5V, VFB = 1.5V30µA
IN Undervoltage Lockout
ThresholdIN rising, 200mV hysteresis1.75V
LDO Output Voltage6V ≤ VSUP ≤ 13V, ILDO = 12.5mA 4.65.4V
LDO Undervoltage Lockout
ThresholdLDO rising, 200mV hysteresis2.43.0V
LDO Output Current15mA
SUP Supply Voltage Range4.513.0V
SUP Undervoltage Fault
Threshold1.4V
SUP Supply CurrentVPOS_ = 4V, no load
LX not switching3.0LX switching30
STEP-UP REGULATOR
Operating FrequencyFREQ = AGND512768kHzFREQ = IN10201380
Maximum Duty Cycle
FREQ = AGND9199FREQ = IN8896
FREQ Input Low VoltageVIN = 1.8V to 5.5V0.6V
PARAMETERCONDITIONSMINTYPMAXUNITS
CTL Input-High VoltageVIN = 1.8V to 2.4V1.4V
VIN = 2.4V to 5.5V2.0
CTL Input-Leakage CurrentCTL = AGND or IN-1+1µA
CTL-to-SRC Propagation Delay
COM falling, no load on COM100COM rising, no load on COM100
SRC Input-Voltage Range28V
SRC Input CurrentVDRN = 8V, CTL = AGND, VDEL = 1.5V1530µAVDRN = 8V, CTL = IN, VDEL = 1.5V100180
DRN Input CurrentVDRN = 8V, CTL = AGND, VDEL = 1.5V90150µA
SRC-to-COM Switch On-
ResistanceVDEL = 1.5V, CTL = IN1530Ω
DRN-to-COM Switch On-
ResistanceVDEL = 1.5V, CTL = AGND3060Ω
MAX8739TFT, LCD, DC-DC Converter with Operational Ampliiers
Electrical Characteristics (continued)
Electrical Characteristics
(VIN = 2.5V, VSUP = 10V, VSRC = 28V, FREQ = CTL = IN, PGND = AGND = 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
FREQ Input-High VoltageVIN = 1.8V to 2.4V1.4VVIN = 2.4V to 5.5V2.0
FREQ Pulldown CurrentVFREQ = 1.0V3.56.0µA
FB Regulation VoltageISWITCH = 200mA1.2201.260V
FB Fault-Trip LevelFalling edge0.961.04V
Duration to Trigger-Fault
Condition
FREQ = AGND 4164msFREQ = IN4765
FB Line Regulation VIN =1.8V to 5.5V-0.15+0.15%/V
FB Input Bias CurrentVFB = 1.3V200nA
FB TransconductanceDICOMP = 5µA 75280µS
LX On-ResistanceILX = 200mA400mΩ
LX Current LimitVFB = IV, duty cycle = 65%1.52.3A
Current-Sense Transresistance0.220.50V/A
OPERATIONAL AMPLIFIERS
Input Offset VoltageVCM = VSUP/2, TA = +25°C12mV
Input Common-Mode Voltage
RangeNEG1, POS1, NEG2, POS20VSUPV
Common-Mode Rejection Ratio0 ≤ VNEG_, VPOS_ ≤ VSUP50dB
Output Voltage Swing High
IOUT_ = 100µAVSUP -
IOUT_ = 5mAVSUP -
Output Voltage Swing LowIOUT_ = -100µA15mVIOUT_ = -5mA150
Short-Circuit CurrentTo VSUP/2Source50mASink50
Output Source-and-Sink CurrentBuffer coniguration, VPOS_ = 4V, |DVOS| < 10mV40mA
Power-Supply Rejection RatioDC, 6V ≤ VSUP ≤ 13V, VPOS_, VNEG_ = VSUP/260dB
MAX8739TFT, LCD, DC-DC Converter with Operational Ampliiers
Electrical Characteristics (continued)
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
(VIN = 2.5V, VSUP = 10V, VSRC = 28V, FREQ = CTL = IN, PGND = AGND = 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
(Circuit of Figure 1, VIN = 2.5V, VMAIN = 8V, FREQ = IN, TA = +25°C, unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES
DEL Capacitor Charge CurrentDuring startup, VDEL = 1V46µA
DEL Turn-On Threshold1.1781.302V
CTL Input-Low VoltageVIN = 1.8V to 5.5V0.6V
CTL Input-High VoltageVIN = 1.8V to 2.4V1.4VVIN = 2.4V to 5.5V2.0
SRC Input-Voltage Range28V
SRC Input CurrentVDRN = 8V, CTL = AGND, VDEL = 1.5V30µAVDRN = 8V, CTL = IN, VDEL = 1.5V180
DRN Input CurrentVDRN = 8V, CTL = AGND, VDEL = 1.5V150µA
SRC-to-COM Switch
On-ResistanceVDEL = 1.5V, CTL = IN30Ω
DRN-to-COM Switch
On-ResistanceVDEL = 1.5V, CTL = AGND60Ω
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT
MAX8739 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
fSW = 600MHz
VOUT = 8V
L = 6.2µH
VIN = 3.3V
VIN = 1.8V
VIN = 5V
STEP-UP REGULATOR
LOAD REGULATION
MAX8739 toc03
LOAD CURRENT (mA)
VOLTAGE ACCURACY (%)
fSW = 1.2MHz
VOUT = 8V
VIN = 1.8V
VIN = 3.3V
VIN = 5V
STEP-UP REGULATOR EFFICIENCY
vs. LOAD CURRENT
MAX8739 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
fSW = 1.2MHz
VOUT = 8V
L = 3.0µH
VIN = 3.3V
VIN = 1.8V
VIN = 5V
MAX8739TFT, LCD, DC-DC Converter with Operational Ampliiers
Electrical Characteristics (continued)
Typical Operating Characteristics
(Circuit of Figure 1, VIN = 2.5V, VMAIN = 8V, FREQ = IN, TA = +25°C, unless otherwise noted.)
IN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8739 toc04
SUPPLY VOLTAGE (V)
IN SUPPLY CURRENT (µA)4326
NOT SWITCHING
SWITCHING
IN SUPPLY CURRENT
vs. TEMPERATURE
MAX8739toc05
TEMPERATURE (°C)
IN SUPPLY CURRENT (µA)4010-20
NOT SWITCHING
SWITCHING
VIN = 3.3V
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX8739toc06
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)432
FREQ = GND
FREQ = IN
STEP-UP REGULATOR SOFT-START
(HEAVY LOAD)
MAX8739 toc07
A: VIN, 2V/div
B: VMAIN, 5V/div
C: INDUCTOR CURRENT, 1A/div
2ms/div
STEP-UP REGULATOR
LOAD-TRANSIENT RESPONSE
MAX8739toc08
A: VMAIN, AC-COUPLED, 200mV/div
B: INDUCTOR CURRENT, 500mA/div
C: LOAD CURRENT, 500mA/div
20µs/div
STEP-UP REGULATOR PULSED
LOAD-TRANSIENT RESPONSE
MAX8739 toc09
A: VMAIN, AC-COUPLED, 200mV/div
B: INDUCTOR CURRENT, 500mA/div
C: LOAD CURRENT, 500mA/div
20µs/div
MAX8739TFT, LCD, DC-DC Converter with Operational Ampliiers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 2.5V, VMAIN = 8V, FREQ = IN, TA = +25°C, unless otherwise noted.)
TIMER DELAY LATCH
RESPONSE TO OVERLOAD
MAX8739toc10
A: VIN, 2V/div
B: VMAIN, 5V/div
C: INDUCTOR CURRENT, 2A/div
10ms/div
53ms
POWER-UP SEQUENCE
MAX8739toc11
A: VLDO, 5V/div
B: VMAIN, 5V/div
C: VSRC, 20V/div
D: VGON, 20V/div
E: VGOFF, 5V/div
2ms/div
SUP SUPPLY CURRENT
vs. SUP VOLTAGE
MAX8739toc12
SUP VOLTAGE (V)
SUP CURRENT (mA)8612
NOT SWITCHING
SWITCHING
SUP SUPPLY CURRENT
vs. TEMPERATURE
MAX8739 toc13
TEMPERATURE (°C)
SUP SUPPLY CURRENT (mA)4010-20
NOT SWITCHING
SWITCHING
VSUP = 8V
VIN = 3.3V
OPERATIONAL-AMPLIFIER
FREQUENCY RESPONSE
MAX8739 toc14
FREQUENCY (Hz)
GAIN (dB)
100k10M
BUFFER CONFIGURATION
RL = 10kΩ
CL = 1000pF
AV = 1
VSUP = 8V
OPERATIONAL-AMPLIFIER RAIL-TO-RAIL
INPUT/OUTPUT
MAX8739 toc15
A: BUFFER INPUT, 5V/div
B: BUFFER OUTPUT, 5V/div
10µs/div
BUFFER CONFIGURATION
MAX8739TFT, LCD, DC-DC Converter with Operational Ampliiers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 2.5V, VMAIN = 8V, FREQ = IN, TA = +25°C, unless otherwise noted.)
OPERATIONAL-AMPLIFIER
LOAD TRANSIENT RESPONSE
MAX8739 toc16
A: OUTPUT VOLTAGE, AC-COUPLED, 2V/div
B: OUTPUT CURRENT, 50mA/div
1µs/div
OPERATIONAL-AMPLIFIER
LARGE-SIGNAL STEP RESPONSE
MAX8739 toc17
A: INPUT VOLTAGE, 5V/div
B: OUTPUT VOLTAGE, 5V/div
1µs/div
OPERATIONAL-AMPLIFIER
SMALL-SIGNAL STEP RESPONSE
MAX8739toc18
A: INPUT VOLTAGE, AC-COUPLED 50mV/div
B: OUTPUT VOLTAGE, AC-COUPLED 50mV/div
4µs/div
SWITCH CONTROL FUNCTION
MAX8739toc19
A: VGON, 10V/div
B: VCTL, 2V/div
20µs/div
RDRN = 5kΩ
CGON = 1.5nF
MAX8739TFT, LCD, DC-DC Converter with Operational Ampliiers
Typical Operating Characteristics (continued)
PINNAMEFUNCTIONCOMInternal High-Voltage MOSFET Switch Common TerminalSRCSwitch Input. Source of the internal high-voltage, p-channel MOSFET. Bypass SRC to PGND with a
minimum of 0.1µF close to the pins.LDOInternal 5V Linear Regulator Output. This regulator powers all internal circuitry except OUT1 and OUT2 operational ampliiers. Bypass LDO to AGND with a 0.22µF or greater ceramic capacitor.PGND
Power Ground. PGND is the source of the step-up regulator’s n-channel power MOSFET. Connect PGND
to the input capacitor ground terminals through a short, wide PC board trace. Connect PGND to analog
ground (AGND) underneath the IC.AGNDAnalog Ground. Connect AGND to power ground (PGND) underneath the IC.POS1Operational Ampliier 1 Noninverting InputNEG1Operational Ampliier 1 Inverting InputOUT1Operational Ampliier 1 OutputOUT2Operational Ampliier 2 OutputNEG2Operational Ampliier 2 Inverting InputPOS2Operational Ampliier 2 Noninverting InputSUPOperational-Ampliier Supply Input. SUP is the positive supply rail for the OUT1 and OUT2 ampliiers.
SUP is also the supply input of the internal 5V linear regulator. Connect SUP to the main step-up regulator
output and bypass SUP to AGND with a 0.1µF capacitor. LXn-Channel Power MOSFET Drain and Switching Node. Connect the inductor and the catch diode to LX
and minimize the trace area for lowest EMI.INSupply Voltage. IN can range from 1.8V to 5.5V.FREQOscillator Frequency-Select Input. Pull FREQ low or leave it unconnected for 600kHz operation. Connect
FREQ to IN for 1.2MHz operation. This input has a 5µA pulldown.FBStep-Up Regulator Feedback Input. Regulates to 1.24V (nominal). Connect a resistive voltage-divider from
the output (VMAIN) to FB to analog ground (AGND). Place the divider within 5mm of FB.COMPStep-Up Regulator Error-Ampliier Compensation Point. Connect a series resistor and capacitor from
COMP to AGND. See the Loop Compensation section for component selection guidelines.DEL
High-Voltage Switch-Delay Input. Connect a capacitor from DEL to AGND to set the high-voltage switch
startup delay. A 5µA current source charges CDEL. The switches between SRC, COM, and DRN are
disabled during the delay period. CTL
High-Voltage Switch-Control Input. When CTL is high, the high-voltage switch between COM and SRC
is on and the high-voltage switches between COM and DRN are off. When CTL is low, the high-voltage
switch between COM and SRC is off and the high-voltage switches between COM and DRN are on. CTL
is inhibited by the undervoltage lockout and when VDEL is less than 1.24V.DRNSwitch Input. Drain of the internal, high-voltage, back-to-back p-channel MOSFETs connected to COM.EPExposed Pad
MAX8739TFT, LCD, DC-DC Converter with Operational Ampliiers
Pin Description

Partno	Mfg	Dc	Qty	Available	Descript
MAX8739ETP+	MAXIM	N/a	811	avai	TFT, LCD, DC-DC Converter with Operational Amplifiers
MAX8739ETP+T \|MAX8739ETPT	MAXIM	N/a	20000	avai	TFT, LCD, DC-DC Converter with Operational Amplifiers