MAX17112ETB+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX17112ETB+T ,High-Performance, Step-Up, DC-DC ConverterApplications*EP = Exposed pad.Notebook Computer DisplaysLCD Monitor PanelsSimplified Operating Circ ..
MAX17113ETL+ ,Low-Cost Multiple-Output Power Supply for LCD TVsapplications10ms Internal Soft-Startrunning directly from 12V supplies.♦ Current-Mode Step-Down Reg ..
max17113etl+t ,Low-Cost Multiple-Output Power Supply for LCD TVsELECTRICAL CHARACTERISTICS(Circuit of Figure 1, V = V = 12V, T = 0°C to +85°C. Typical values are a ..
MAX17114ETM+CB2 ,Multi-Output Power Supply with VCOM Amplifier and High-Voltage Gamma Reference for LCD TVsFeaturesThe MAX17114 generates all the supply rails for thin-film S 8.0V to 16.5V IN Supply-Voltage ..
MAX17119ETI+ ,10-Channel Scan Driver for TFT LCD with GPM FunctionELECTRICAL CHARACTERISTICS(Circuit of Figure 1, V = 30V, V = -6.2V, T = 0°C to +85°C. Typical value ..
MAX17119ETI+T ,10-Channel Scan Driver for TFT LCD with GPM FunctionApplicationsLCD MonitorsLCD TVs ___ Maxim Integrated Products 1For pricing, delivery, and ordering ..
MAX4537CPE ,Quad / Low-Voltage / SPST Analog Switches with EnableGeneral Description __________
MAX4537CSE ,Quad / Low-Voltage / SPST Analog Switches with EnableFeaturesThe MAX4536/MAX4537/MAX4538 are quad, low-voltage,' Pin Compatible with 74HC4316 single-pol ..
MAX4537ESE+ ,Quad, Low-Voltage, SPST Analog Switches with EnableELECTRICAL CHARACTERISTICS—±5V Dual Supplies(V+ = 4.5V to 5.5V, V- = -4.5V to -5.5V, V = 2.4V, V = ..
MAX4538CEE ,Quad / Low-Voltage / SPST Analog Switches with EnableGeneral Description __________
MAX4538CPE ,Quad / Low-Voltage / SPST Analog Switches with EnableGeneral Description __________
MAX4538ESE ,Quad / Low-Voltage / SPST Analog Switches with EnableApplicationsBattery-Operated Equipment PART TEMP. RANGE PIN-PACKAGEMAX4536CPE 0°C to +70°C 16 Plast ..

MAX17112ETB+T
High-Performance, Step-Up, DC-DC Converter
General Description
The MAX17112 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 MAX17112 incorporates current-
mode, fixed-frequency (1MHz), pulse-width modulation
(PWM) circuitry with a built-in, n-channel power MOSFET
to achieve high efficiency and fast-transient response.
The input overvoltage protection (OVP) function pre-
vents damage to the MAX17112 from an input surge
voltage (up to 24V).
The high switching frequency (1MHz) allows the use of
ultra-small inductors and low-ESR ceramic capacitors.
The current-mode architecture provides fast-transient
response to pulsed loads. A compensation pin (COMP)
gives users flexibility in adjusting loop dynamics.The
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 pro-
grammable with an external capacitor. The MAX17112
is available in a 10-pin TDFN package.
Applications
Notebook Computer Displays
LCD Monitor Panels
FeaturesInput Overvoltage ProtectionAdjustable Output from VINto 20V2.6V to 5.5V Input Supply RangeInput Supply Undervoltage Lockout1MHz Fixed Switching FrequencyProgrammable Soft-StartSmall 10-Pin, TDFN PackageThermal-Overload Protection
MAX17112
High-Performance, Step-Up, DC-DC Converter+
COMP
GND
MAX17112SHDNFBLX*EP
*EXPOSED PAD
GND
TDFN3mm × 3mm
TOP VIEW
Pin Configuration
Ordering InformationLX
GND
GND
GND
COMPSS
VOUTVIN
2.6V TO 5.5V
SHDN
MAX17112
Simplified Operating Circuit
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-PACKAGE
MAX17112ETB+ -40°C to +85°C 10 TDFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
19-4393; Rev 0; 12/08
MAX17112
High-Performance, Step-Up, DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VL= 3V, TA=0°C to +85°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.
LX to GND..............................................................-0.3V to +24V
IN to GND...............................................................-0.3V to +24V
SHDN, VLto GND..................................................-0.3V to +7.5V
COMP, SS, FB to GND..................................-0.3V to (VL+ 0.3V)
LX Switch Maximum Continuous RMS Current.....................3.2A
Continuous Power Dissipation (TA= +70°C)
10-Pin 3mm x 3mm Thin 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 +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
VOUT < 18V 2.6 5.5 V IN Supply Range 18V < VOUT < 20V 4.0 5.5 V
OVP Threshold VIN rising 6.2 6.6 7 V
OVP Switch Resistance 8 12 20
Output Voltage Range 20 V
VL Undervoltage-Lockout
Threshold rising; typical hysteresis is 50mV; LX remains off
below this level 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
IN Shutdown Supply Current SHDN = GND 160 250 μA
Temperature rising 160 Thermal Shutdown Hysteresis 20 °C
ERROR AMPLIFIER
Feedback Voltage Level to produce VCOMP = 1.24V 1.23 1.24 1.25 V
FB Input Bias Current VFB = 1.24V 50 125 225 nA
FB Line Regulation Level to produce VCOMP = 1.24V, 2.6V < VIN < 5.5V 0.05 0.15 %/V
Transconductance 110 300 450 μS
Voltage Gain 2400 V/V
Shutdown FB Input Voltage SHDN = GND 0.05 0.10 0.15 V
OSCILLATOR
Frequency (fOSC) 800 1000 1200 kHz
Maximum Duty Cycle 89 92 95 %
n-CHANNEL MOSFET
Current Limit VFB = 1V, 75% duty cycle, VL = 5V 3.9 4.6 5.3 A
VL = 5V (typ value at TA = +25°C) (Note 1) 110 170 On-Resistance VL = 3V (typ value at TA = +25°C) (Note 1) 135 210 m
Leakage Current VLX = 20V 12 25 μA
Current-Sense Transresistance VL = 5V 0.09 0.15 0.25 V/A
MAX17112
High-Performance, Step-Up, DC-DC Converter
PARAMETERCONDITIONSMINTYPMAXUNITS
SOFT-START
Reset Switch Resistance 25
Charge Current VSS = 1.2V 1.5 3.5 5.5 μA
CONTROL INPUTS
SHDN Threshold SHDN rising 1.1 1.16 1.22 V
SHDN Input Hysteresis 60 mV
SHDN Discharge Resistance VL < UVLO 20
SHDN Charge Current 4.25 5 5.75 μA
Charge Current Delay Time 80 μs
ELECTRICAL CHARACTERISTICS (continued)
(VVL= 3V, TA=0°C to +85°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
(VL=3V, TA= -40°C to +85°C, unless otherwise noted.)(Note 1)
PARAMETERCONDITIONSMINMAXUNITS
VOUT < 18V 2.6 5.5 V IN Supply Range 18V < VOUT < 20V 4.0 5.5 V
Output Voltage Range 20 V
Output Switch Resistance 8 20
VL Undervoltage-Lockout
Threshold rising; typical hysteresis is 50mV; LX remains off
below this level 2.30 2.57 V
VFB = 1.3V, not switching 0.6 IN Quiescent Current
VFB = 1.0V, switching 2.5
mA
IN Shutdown Supply Current SHDN = GND 250 μA
ERROR AMPLIFIER
Feedback Voltage Level to produce VCOMP = 1.24V 1.227 1.253 V
FB Input Bias Current VFB = 1.24V 225 nA
Transconductance 110 450 μS
Shutdown FB Input Voltage SHDN = GND 0.05 0.15 V
OSCILLATOR
Frequency (fOSC) 750 1250 kHz
Maximum Duty Cycle 89 96 %
EFFICIENCY vs. LOAD CURRENT
(VIN = 5V, VOUT = 15V)
MAX17112 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
EFFICIENCY vs. LOAD CURRENT
(VIN = 3.3V, VOUT = 9V)
MAX17112 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
LOAD REGULATION
(VOUT = 15V)
MAX17112 toc03
LOAD CURRENT (mA)
LOAD REGULATION (%)
VIN = 5.0V
VIN = 3.3V
Typical Operating Characteristics
(Circuit of Figure 1, VIN= 5V, VMAIN= 15V, TA= +25°C, unless otherwise noted.)
MAX17112
High-Performance, Step-Up, DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)
(VVL=3V, TA= -40°C to +85°C, unless otherwise noted.)(Note 1)
PARAMETERCONDITIONSMINMAXUNITS
n-CHANNEL MOSFET
Current Limit VFB = 1V, 75% duty cycle, VL = 5V 3.9 5.3 A
VL = 5V 170 On-Resistance VL = 3V 210 m
Current-Sense Transresistance VL = 5V 0.09 0.25 V/A
SOFT-START
Reset Switch Resistance 25
Charge Current VSS = 1.2V 1.5 5.5 μA
CONTROL INPUTS
SHDN Threshold SHDN rising 1.19 1.29 V
SHDN Charge Current 4.25 5.75 μA
Note 1:Limits are 100% production tested at TA= +25°C. Maximum and minimum limits over temperature are guaranteed by design
and characterization.
MAX17112
High-Performance, Step-Up, DC-DC Converter
LOAD-TRANSIENT RESPONSE
(ILOAD = 50mA TO 550mA)
MAX17112 toc07
100µs/div
50mA
15V
VOUT
500mV/div
AC-COUPLED
IOUT
500mA/div
INDUCTOR
CURRENT
2A/div
L = 2.7µH
RCOMP = 47kΩ
CCOMP1 = 560pF
PULSED LOAD-TRANSIENT RESPONSE
(ILOAD = 100mA TO 1.1A)
MAX17112 toc08
10µs/div
0.1A
15V
VOUT
200mV/div
AC-COUPLED
IOUT
1A/div
INDUCTOR
CURRENT
1A/div
L = 2.7µH
RCOMP = 47kΩ
CCOMP1 = 560pF
SWITCHING WAVEFORMS
(ILOAD = 600mA)
MAX17112 toc09
1µs/div
10V/div
INDUCTOR
CURRENT
1A/div
VIN OVP PROTECTION
MAX17112 toc10
10ms/div
VIN
5V/div
5V/div
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN= 5V, VMAIN= 15V, TA= +25°C, unless otherwise noted.)
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX17112 toc04
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX17112 toc05
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
SWITCHING
NONSWITCHING
SOFT-START
(RLOAD = 30Ω)
MAX17112 toc06
2ms/div
VOUT
5V/div
INDUCTOR
CURRENT
1A/div
MAX17112
High-Performance, Step-Up, DC-DC Converter
Pin Description
PINNAMEFUNCTION
1 COMP Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. Typical values
are 47k and 580pF.
2 FB Feedback. The FB regulation voltage is 1.24V nominal. Connect an external resistor-divider center
tap here and minimize the trace area. Set VOUT according to the Output Voltage Selection section.
3 VLIC Supply. There is an internal switch between IN and VL and the switch disconnects when an
overvoltage condition on IN is detected. Bypass VL to GND with a 1μF capacitor.
4, 5 GND Ground
6, 7 LX Switch. LX is the drain of the internal MOSFET. IN Supply Voltage Input. Bypass IN with a minimum 1μF ceramic capacitor directly to GND. SHDN
Shutdown Control Input. Drive SHDN high to turn on the MAX17112 for normal operation. Connect a
capacitor to the SHDN pin to create a delayed turn-on. The time delay is 0.25 x C (typ), C in
microfarads. SHDN can be driven from a logic signal directly, in which case a resistor is required
in series with SHDN.
10 SS Soft-Start Control. Connect a soft-start capacitor (CSS). Leave open for no soft-start. The soft-start
capacitor is charged at a rate of 4μA/CSS.EP Exposed Pad. Connect to GND.
GND
GND
GNDEP
COMP76
VOUT
+15V/600mA
VIN
4.5V TO 5.5V
MAX17112
4.7μF
10V
4.7μF
10V
1μF
C10
1μF
1μF
3.3nF
560pF
OPEN
2.7μHD1
47kΩ
20kΩ
221kΩ
10μF
25V
10μF
25V
SHDN

Partno	Mfg	Dc	Qty	Available	Descript
MAX17112ETB+T	MAXIM	N/a	2450	avai	High-Performance, Step-Up, DC-DC Converter