MAX17062ETB+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX17062ETB+ ,TFT-LCD Step-Up DC-DC ConverterApplications10 TDFN-EP* MAX17062ETB+T -40°C to +85°C T1033-2 Notebook Computer Displays(3mm x 3mm) ..
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MAX1706EEE ,1- to 3-Cell / High-Current / Low-Noise / Step-Up DC-DC Converters with Linear RegulatorFeaturesThe MAX1705/MAX1706 are high-efficiency, low-noise, ' Up to 96% Efficiencystep-up DC-DC con ..
MAX1706EEE ,1- to 3-Cell / High-Current / Low-Noise / Step-Up DC-DC Converters with Linear RegulatorMAX1705/MAX170619-1198; Rev 0; 4/971- to 3-Cell, High-Current, Low-Noise, Step-Up DC-DC Converters ..
MAX1706EEE ,1- to 3-Cell / High-Current / Low-Noise / Step-Up DC-DC Converters with Linear RegulatorApplications __________Typical Operating CircuitDigital Cordless Phones PCS PhonesPersonal Communic ..
MAX1706EEE+ ,1 to 3 Cell, High Current, Low-Noise, Step-Up DC-DC Converters with Linear RegulatorELECTRICAL CHARACTERISTICS(V = V = V = 3.6V, CLK/SEL = FB = LBN = LBO = ONA = ONB = TRACK = GND, RE ..
MAX4525CUB+ ,Low-Voltage, Single-Supply Multiplexer and SwitchMAX4524/MAX452519-1332; Rev 2; 6/07Low-Voltage, Single-Supply Multiplexer and Switch ______________ ..
MAX4525CUB+T ,Low-Voltage, Single-Supply Multiplexer and SwitchMAX4524/MAX452519-1332; Rev 2; 6/07Low-Voltage, Single-Supply Multiplexer and Switch ______________ ..
MAX4525EUB ,Low-Voltage / Single-Supply Multiplexer and SwitchELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)(V+ = +4.5V to +5.5V, GND = 0V, V = 2.4V, V ..
MAX4525EUB ,Low-Voltage / Single-Supply Multiplexer and SwitchGeneral Description ________
MAX4525EUB+T ,Low-Voltage, Single-Supply Multiplexer and SwitchGeneral Description ________
MAX4525EUB+T ,Low-Voltage, Single-Supply Multiplexer and SwitchELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)(V+ = 4.5V to 5.5V, GND = 0V, V = 2.4V, V = ..

MAX17062ETB+
TFT-LCD Step-Up DC-DC Converter
General Description
The MAX17062 is a high-performance step-up DC-DC
converter that provides a regulated supply voltage for
active-matrix thin-film transistor (TFT) liquid-crystal dis-
plays (LCDs). The MAX17062 incorporates current-
mode, fixed-frequency, pulse-width modulation (PWM)
circuitry with a built-in n-channel power MOSFET to
achieve high efficiency and fast-transient response.
Users can select 640kHz or 1.2MHz operation using a
logic input pin (FREQ). The high switching frequencies
allow the use of ultra-small inductors and low-ESR
ceramic capacitors. The current-mode architecture pro-
vides fast transient response to pulsed loads. A com-
pensation pin (COMP) gives users flexibility in adjusting
loop dynamics. The 22V internal MOSFET can generate
output voltages up to 20V from an input voltage
between 2.6V and 5.5V. Soft-start slowly ramps the input
current and is programmed with an external capacitor.
The MAX17062 is available in a 10-pin TDFN package.
Applications
Notebook Computer Displays
LCD Monitor Panels
LCD TV Panels
Features90% EfficiencyAdjustable Output from VINto 20V2.6V to 5.5V Input Supply RangeInput Supply Undervoltage LockoutPin-Programmable 640kHz/1.2MHz Switching
FrequencyProgrammable Soft-StartImproved EMIFB Regulation Voltage Tolerance < 1%Small 10-Pin TDFN PackageThermal-Overload Protection
MAX17062
TFT-LCD Step-Up DC-DC Converter
Ordering Information
19-1042; Rev 0; 10/07
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODE
MAX17062ETB+T -40°C to +85°C10 TDFN-EP*
(3mm x 3mm) T1033-2
COMP3459876
PGNDPGNDSHDNFREQLXLXIN
MAX17062
TOP VIEW
TDFN
(3mm x 3mm)
*EP = EXPOSED PAD.
*EP
Pin ConfigurationLX
PGND
PGND
AGND
FREQ
COMPSS
VOUTVIN
2.6V TO 5.5V
SHDN
MAX17062
Minimal Operating Circuit
+Denotes a lead-free package.
*EP = Exposed pad.
T = Tape and reel.
MAX17062
TFT-LCD Step-Up DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= VSHDN= 3V, FREQ = 3V, TA= 0°C to +85°C. Typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
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.
LX to AGND............................................................-0.3V to +22V
IN, SHDN, FREQ, FB to AGND..............................-0.3V to +7.5V
COMP, SS to AGND....................................-0.3V to (VIN+ 0.3V)
PGND to AGND.....................................................-0.3V to +0.3V
LX Switch Maximum Continuous RMS Current.....................3.2A
Continuous Power Dissipation (TA= +70°C)
10-Pin TDFN (derate 24.4mW/°C above +70°C)..........1951mW
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
VOUT < 18V 2.6 5.5 Input Voltage Range 18V < VOUT < 20V 4.0 5.5 V
Output Voltage Range 20 V
IN Undervoltage-Lockout
Threshold VIN rising, typical hysteresis is 50mV 2.30 2.45 2.57 V
VFB = 1.3V, not switching 0.3 0.6 IN Quiescent Current VFB = 1.0V, switching 1.5 2.5 mA
SHDN = AGND, TA = +25°C 0.01 10.0 IN Shutdown Current SHDN = AGND, TA = +85°C 0.01 μA
Temperature rising 160 Thermal Shutdown Hysteresis 20 °C
ERROR AMPLIFIER
FB Regulation Voltage Level to produce VCOMP = 1.24V 1.23 1.24 1.25 V
FB Input Bias Current VFB = 1.24V 75 150 225 nA
FB Line Regulation Level to produce VCOMP = 1.24V, VIN = 2.6V to 5.5V 0.01 0.15 %/V
Transconductance 110 250 450 μS
Voltage Gain 2400 V/V
Shutdown FB Input Voltage SHDN = AGND 0.05 0.10 0.15 V
OSCILLATOR
FREQ = AGND 500 640 780 Frequency
FREQ = IN 1000 1200 1400
kHz
Maximum Duty Cycle 88 91 94 %
n-CHANNEL MOSFET
Current Limit VFB = 1V, 75% duty cycle, IN = 5V 3.9 4.6 5.3 A
IN = 5V 100 170 On-Resistance IN = 3V 125 210 m
Leakage Current VLX = 20V 1120 μA
Current-Sense Transresistance IN = 5V 0.09 0.15 0.25 V/A
SOFT-START
Reset Switch Resistance 100
Charge Current VSS = 1.2V 2 4 6 μA
MAX17062
TFT-LCD Step-Up DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VSHDN= 3V, FREQ = 3V, TA= 0°C to +85°C. Typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
CONTROL INPUTS
SHDN, FREQ Input Low Voltage VIN = 2.6V to 5.5V 0.3
VINV
SHDN, FREQ Input High Voltage VIN = 2.6V to 5.5V 0.7
VIN V
SHDN, FREQ Input Hysteresis VIN = 2.6V to 5.5V 0.1
VIN V
FREQ Pulldown Current 3 6 9 μA
SHDN = AGND, TA = +25°C -1 +1 SHDN Input Current SHDN = AGND, TA = +85°C 0 μA
ELECTRICAL CHARACTERISTICS
(VIN= VSHDN= 3V, FREQ = 3V, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
VOUT < 18V 2.6 5.5 Input Voltage Range 18V < VOUT < 20V 4.0 5.5 V
Output Voltage Range 20 V
IN Undervoltage-Lockout
Threshold VIN rising, typical hysteresis is 50mV 2.30 2.57 V
VFB = 1.3V, not switching 0.6 IN Quiescent Current VFB = 1.0V, switching 2.5 mA
ERROR AMPLIFIER
FB Regulation Voltage Level to produce VCOMP = 1.24V 1.227 1.253 V
FB Input Bias Current VFB = 1.24V 225 nA
FB Line Regulation Level to produce VCOMP = 1.24V, VIN = 2.6V to 5.5V 0.15 %/V
Transconductance 110 450 μS
Shutdown FB Input Voltage SHDN = AGND 0.05 0.15 V
OSCILLATOR
FREQ = AGND 450 830 Frequency FREQ = IN 950 1500 kHz
Maximum Duty Cycle 87 95 %
n-CHANNEL MOSFET
Current Limit VFB = 1V, 75% duty cycle, IN = 5V 3.9 5.3 A
IN = 5V 170 On-Resistance IN = 3V 210 m
Current-Sense Transresistance IN = 5V 0.09 0.25 V/A
SOFT-START
Reset Switch Resistance 100
Charge Current VSS = 1.2V 2 6 μA
MAX17062
TFT-LCD Step-Up DC-DC Converter
Note 1: Limits are 100% tested at TA= +25°C. Maximum and minimum limits over temperature are guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VSHDN= 3V, FREQ = 3V, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
CONTROL INPUTS
SHDN, FREQ Input Low Voltage VIN = 2.6V to 5.5V 0.3
VINV
SHDN, FREQ Input High Voltage VIN = 2.6V to 5.5V 0.7
VIN V
EFFICIENCY vs. LOAD CURRENT
(VIN = 5V, VOUT = 15V)
MAX17062 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
fOSC = 640kHz
L = 4.7μH
L = 2.7μH
fOSC = 1.2MHz
EFFICIENCY vs. LOAD CURRENT
(VIN = 3.3V, VOUT = 9V)
MAX17062 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
fOSC = 640kHz
L = 4.7μH
fOSC = 1.2MHz
L = 2.7μH
LOAD REGULATION
(VOUT = 15V)
MAX17062 toc03
LOAD CURRENT (mA)
LOAD REGULATION (%)
VIN = 5.0V
VIN = 3.3V
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX17062 toc04
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
FREQ = IN
FREQ = GND
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX17062 toc05
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
SWITCHING
NONSWITCHING
Typical Operating Characteristics
(Circuit of Figure 1. VIN= 5V, VMAIN= 15V, TA= +25°C, unless otherwise noted.)
MAX17062
TFT-LCD Step-Up DC-DC Converter
SOFT-START
(RLOAD = 30Ω)
MAX17062 toc06
2ms/div
INDUCTOR
CURRENT
1A/div
VOUT
5V/div
LOAD-TRANSIENT RESPONSE
(ILOAD = 50mA TO 550mA)
MAX17062 toc07
100μs/div
L = 2.7μH
RCOMP = 47kΩ
CCOMP1 = 560pF
INDUCTOR
CURRENT
2A/div
50mA
15V
VOUT
500mV/div
AC-COUPLED
IOUT
500mA/div
PULSED LOAD-TRANSIENT RESPONSE
(ILOAD = 100mA TO 1.1A)
MAX17062 toc08
10μs/div
INDUCTOR
CURRENT
1A/div
0.1A
15V
VOUT
200mV/div
AC-COUPLED
IOUT
1A/div
L = 2.7μH
RCOMP = 47kΩ
CCOMP1 = 560pF
SWITCHING WAVEFORMS
(ILOAD = 600mA)
MAX17062 toc09
1μs/div
INDUCTOR
CURRENT
1A/div
10V/div
Typical Operating Characteristics (continued)
(Circuit of Figure1. VIN= 5V, VMAIN= 15V, TA= +25°C, unless otherwise noted.)
MAX17062
TFT-LCD Step-Up DC-DC Converter
PINNAMEFUNCTION
1 COMP Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. See the Loop
Compensation section for component selection guidelines.
2 FB
Feedback Pin. The FB regulation voltage is 1.24V nominal. Connect an external resistive voltage-divider
between the step-up regulator’s output (VOUT) and AGND, with the center tap connected to FB. Place the
divider close to the IC and minimize the trace area to reduce noise coupling. Set VOUT according to the
Output Voltage Selection section.SHDN Shutdown Control Input. Drive SHDN low to turn off the MAX17062.
4, 5 PGND Power Ground. Connect pins 4 and 5 directly together.
6, 7 LX Switch Pin. LX is the drain of the internal MOSFET. Connect the inductor/rectifier diode junction to LX and
minimize the trace area for lower EMI. Connect pins 6 and 7 together. IN Supply Pin. Bypass IN with a minimum 1μF ceramic capacitor directly to AGND.
9 FREQ Frequency-Select Input. When FREQ is low, the oscillator frequency is set to 640kHz. When FREQ is high,
the frequency is 1.2MHz. This input has a 6μA pulldown current.
10 SS
Soft-Start Control Pin. Connect a soft-start capacitor (CSS) to this pin. Leave open for no soft-start. The soft-
start capacitor is charged with a constant current of 4μA. Full current limit is reached when the voltage of
SS pin is charged to 1.5V, which is the current-limit time, t = 2.4 105 CSS. The soft-start capacitor is
discharged to ground when SHDN is low. When SHDN goes high, the soft-start capacitor is charged to 0.4V,
after which soft-start begins.
EP AGND Exposed Pad. Connect to AGND.
Pin Description
PGND
PGND
AGNDEP
FREQ
COMPSS769
VOUT
+15V/600mA
VIN
4.5V TO 5.5V
SHDN
MAX17062
4.7μF
10V
4.7μF
10V
10Ω
1μF
33nF
560pF
OPEN
2.7μHD1
47kΩ
20kΩ
221kΩ
10μF
25V
10μF
25V
Figure 1. Typical Operating Circuit
Detailed Description
The MAX17062 is a highly efficient power supply that
employs a current-mode, fixed-frequency, PWM archi-
tecture for fast-transient response and low-noise opera-
tion. The device regulates the output voltage through a
combination of an error amplifier, two comparators, and
several signal generators (Figure 2). The error amplifier
compares the signal at FB to 1.24V and varies the
COMP output. The voltage at COMP determines the
current trip point each time the internal MOSFET turns
on. As the load changes, the error amplifier sources or
sinks current to the COMP output to command the
inductor peak current necessary to service the load. To
maintain stability at high duty cycles, a slope-compen-
sation signal is summed with the current-sense signal.
At light loads, this architecture allows the MAX17062 to
“skip” cycles to prevent overcharging the output voltage.
In this region of operation, the inductor ramps up to a
peak value of approximately 50mA, discharges to the
output, and waits until another pulse is needed again.
Output Current Capability
The output current capability of the MAX17062 is a
function of current limit, input voltage, operating fre-
quency, and inductor value. Because of the slope com-
pensation used to stabilize the feedback loop, the
inductor current limit depends on the duty cycle. The
current limit is determined by the following equation:
ILIM= (1.26 - 0.35 x D) x ILIM_EC
where ILIM_ECis the current limit specified at 75% duty
cycle (see the Electrical Characteristics table) and D is
the duty cycle.
The output current capability depends on the current-
limit value and is governed by the following equation:
where ILIMis the current limit calculated above, ηis the
regulator efficiency (85% nominal), and D is the duty
cycle. The duty cycle when operating at the current
limit is:
where VDIODEis the rectifier diode forward voltage and
RONis the on-resistance of the internal MOSFET.VVVRV
OUTINDIODE
OUTLIMONDIODE =−+×+DVOUTMAXLIMIN
OSC
OUT . =−××⎢⎥××05η
MAX17062
TFT-LCD Step-Up DC-DC Converter
PGND
FREQ
COMP
4μA
6μA
ERROR
COMPARATOR
ERROR
AMPLIFIER
SKIP
COMPARATOR
CLOCK
SKIP
BIAS
SHDN
MAX17062CURRENT
SENSE
CONTROL
AND DRIVER
LOGIC
SOFT-
START
SLOPE
COMPEN-
SATION
OSCILLATOR
1.24V
Figure 2. MAX17062 Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX17062ETB+	MAXIM	N/a	1600	avai	TFT-LCD Step-Up DC-DC Converter