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Maxim Integrated Products
Maxim Integrated Products

MAX17112 Datasheet

DC-DC Converter


MAX17112 Datasheet Preview


19-4393; Rev 0; 12/08
www.DataSheet4EUV.cAAoLVmUAAILTAIOBNLEKIT
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
Features
o Input Overvoltage Protection
o Adjustable Output from VIN to 20V
o 2.6V to 5.5V Input Supply Range
o Input Supply Undervoltage Lockout
o 1MHz Fixed Switching Frequency
o Programmable Soft-Start
o Small 10-Pin, TDFN Package
o Thermal-Overload Protection
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX17112ETB+
-40°C to +85°C
10 TDFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Operating Circuit
Pin Configuration
VIN
2.6V TO 5.5V
6
LX
8
IN
7
LX
FB 2
MAX17112
9
SHDN
GND 5
3 VL
GND 4
10
SS
GND
EP
COMP 1
VOUT
TOP VIEW
COMP 1 +
FB 2
VL 3
GND 4
GND 5
MAX17112
*EP
10 SS
9 SHDN
8 IN
7 LX
6 LX
*EXPOSED PAD
TDFN
3mm × 3mm
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Page 1

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High-Performance, Step-Up, DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
LX to GND ..............................................................-0.3V to +24V
IN to GND ...............................................................-0.3V to +24V
SHDN, VL to 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
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
(VL = 3V, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
IN Supply Range
OVP Threshold
OVP Switch Resistance
Output Voltage Range
VOUT < 18V
18V < VOUT < 20V
VIN rising
CONDITIONS
VL Undervoltage-Lockout
Threshold
IN Quiescent Current
IN Shutdown Supply Current
Thermal Shutdown
ERROR AMPLIFIER
Feedback Voltage
FB Input Bias Current
FB Line Regulation
Transconductance
Voltage Gain
Shutdown FB Input Voltage
OSCILLATOR
Frequency (fOSC)
Maximum Duty Cycle
n-CHANNEL MOSFET
Current Limit
On-Resistance
Leakage Current
Current-Sense Transresistance
VL rising; typical hysteresis is 50mV; LX remains off
below this level
VFB = 1.3V, not switching
VFB = 1.0V, switching
SHDN = GND
Temperature rising
Hysteresis
Level to produce VCOMP = 1.24V
VFB = 1.24V
Level to produce VCOMP = 1.24V, 2.6V < VIN < 5.5V
SHDN = GND
VFB = 1V, 75% duty cycle, VL = 5V
VL = 5V (typ value at TA = +25°C) (Note 1)
VL = 3V (typ value at TA = +25°C) (Note 1)
VLX = 20V
VL = 5V
MIN
2.6
4.0
6.2
8
2.30
TYP
6.6
12
2.45
0.3
1.5
160
160
20
MAX
5.5
5.5
7
20
20
UNITS
V
V
V

V
2.57 V
0.6
mA
2.5
250 μA
°C
1.23
50
110
0.05
1.24
125
0.05
300
2400
0.10
1.25
225
0.15
450
0.15
V
nA
%/V
μS
V/V
V
800 1000 1200 kHz
89 92 95
%
3.9
0.09
4.6
110
135
12
0.15
5.3
170
210
25
0.25
A
m
μA
V/A
2 _______________________________________________________________________________________
Page 2

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High-Performance, Step-Up, DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)
(VVL = 3V, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
SOFT-START
Reset Switch Resistance
Charge Current
CONTROL INPUTS
SHDN Threshold
SHDN Input Hysteresis
SHDN Discharge Resistance
SHDN Charge Current
Charge Current Delay Time
VSS = 1.2V
SHDN rising
VL < UVLO
CONDITIONS
MIN TYP MAX UNITS
25
1.5 3.5 5.5

μA
1.1 1.16 1.22
60
20
4.25 5 5.75
80
V
mV

μA
μs
ELECTRICAL CHARACTERISTICS
(VL = 3V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
IN Supply Range
Output Voltage Range
Output Switch Resistance
VL Undervoltage-Lockout
Threshold
IN Quiescent Current
IN Shutdown Supply Current
ERROR AMPLIFIER
Feedback Voltage
FB Input Bias Current
Transconductance
Shutdown FB Input Voltage
OSCILLATOR
Frequency (fOSC)
Maximum Duty Cycle
VOUT < 18V
18V < VOUT < 20V
CONDITIONS
VL rising; typical hysteresis is 50mV; LX remains off
below this level
VFB = 1.3V, not switching
VFB = 1.0V, switching
SHDN = GND
Level to produce VCOMP = 1.24V
VFB = 1.24V
SHDN = GND
MIN
2.6
4.0
8
2.30
1.227
110
0.05
750
89
MAX
5.5
5.5
20
20
2.57
0.6
2.5
250
UNITS
V
V
V

V
mA
μA
1.253
225
450
0.15
V
nA
μS
V
1250
96
kHz
%
_______________________________________________________________________________________ 3
Page 3

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High-Performance, Step-Up, DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)
(VVL = 3V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
n-CHANNEL MOSFET
Current Limit
On-Resistance
Current-Sense Transresistance
SOFT-START
Reset Switch Resistance
Charge Current
CONTROL INPUTS
SHDN Threshold
SHDN Charge Current
CONDITIONS
VFB = 1V, 75% duty cycle, VL = 5V
VL = 5V
VL = 3V
VL = 5V
VSS = 1.2V
SHDN rising
MIN
3.9
0.09
1.5
1.19
4.25
MAX UNITS
5.3 A
170
m
210
0.25 V/A
25 
5.5 μA
1.29 V
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.
Typical Operating Characteristics
(Circuit of Figure 1, VIN = 5V, VMAIN = 15V, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(VIN = 5V, VOUT = 15V)
100
90
80
70
60
EFFICIENCY vs. LOAD CURRENT
(VIN = 3.3V, VOUT = 9V)
100
90
80
70
60
LOAD REGULATION
(VOUT = 15V)
1.0
VIN = 5.0V
0.5 VIN = 3.3V
0
-0.5
50
1
10 100
LOAD CURRENT (mA)
50
1000 1
10 100
LOAD CURRENT (mA)
-1.0
1000 1
10 100
LOAD CURRENT (mA)
1000
4 _______________________________________________________________________________________
Page 4
Part Number MAX17112
Manufactur Maxim Integrated Products
Description DC-DC Converter
Total Page 12 Pages
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MAX17112 datasheet
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