OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX17112ETB+T

P1-P3P4-P6P7-P9P10-P12
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 V
IN
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
MAX17112
High-Performance, Step-Up, DC-DC Converter
________________________________________________________________
Maxim Integrated Products
1
1
+
3
4
10
8
7
SS
IN
LX
COMP
V
L
GND
MAX17112
29
SHDNFB
56
LX
*EP
*EXPOSED PAD
GND
TDFN
3mm × 3mm
TOP VIEW
Pin Configuration
Ordering Information
LX LX
FB
GND
GND
GND
V
L
IN
COMP
SS
EP
1
4
5
2
3
9
8
67
10
V
OUT
V
IN
2.6V TO 5.5V
SHDN
MAX17112
Simplified Operating Circuit
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.
EVALUATION KIT
AVAILABLE
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.
19-4393; Rev 0; 12/08
MAX17112
High-Performance, Step-Up, DC-DC Converter
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
L
= 3V, T
A
= 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, V
L
to GND..................................................-0.3V to +7.5V
COMP, SS, FB to GND..................................-0.3V to (V
L
+ 0.3V)
LX Switch Maximum Continuous RMS Current .....................3.2A
Continuous Power Dissipation (T
A
= +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
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OUT
< 18V 2.6 5.5 V
IN Supply Range
18V < V
OUT
< 20V 4.0 5.5 V
OVP Threshold V
IN
rising 6.2 6.6 7 V
OVP Switch Resistance 8 12 20
Output Voltage Range 20 V
VL Undervoltage-Lockout
Threshold
V
L
rising; typical hysteresis is 50mV; LX remains off
below this level
2.30 2.45 2.57 V
V
FB
= 1.3V, not switching 0.3 0.6
IN Quiescent Current
V
FB
= 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 V
COMP
= 1.24V 1.23 1.24 1.25 V
FB Input Bias Current V
FB
= 1.24V 50 125 225 nA
FB Line Regulation Level to produce V
COMP
= 1.24V, 2.6V < V
IN
< 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 (f
OSC
) 800 1000 1200 kHz
Maximum Duty Cycle 89 92 95 %
n-CHANNEL MOSFET
Current Limit V
FB
= 1V, 75% duty cycle, V
L
= 5V 3.9 4.6 5.3 A
V
L
= 5V (typ value at T
A
= +25°C) (Note 1) 110 170
On-Resistance
V
L
= 3V (typ value at T
A
= +25°C) (Note 1) 135 210
m
Leakage Current V
LX
= 20V 12 25 μA
Current-Sense Transresistance V
L
= 5V 0.09 0.15 0.25 V/A
MAX17112
High-Performance, Step-Up, DC-DC Converter
_______________________________________________________________________________________ 3
PARAMETER CONDITIONS MIN TYP MAX UNITS
SOFT-START
Reset Switch Resistance 25
Charge Current V
SS
= 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 V
L
< UVLO 20
SHDN Charge Current 4.25 5 5.75 μA
Charge Current Delay Time 80 μs
ELECTRICAL CHARACTERISTICS (continued)
(V
VL
= 3V, T
A
= 0°C to +85°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
(V
L
= 3V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER CONDITIONS MIN MAX UNITS
V
OUT
< 18V 2.6 5.5 V
IN Supply Range
18V < V
OUT
< 20V 4.0 5.5 V
Output Voltage Range 20 V
Output Switch Resistance 8 20
VL Undervoltage-Lockout
Threshold
V
L
rising; typical hysteresis is 50mV; LX remains off
below this level
2.30 2.57 V
V
FB
= 1.3V, not switching 0.6
IN Quiescent Current
V
FB
= 1.0V, switching 2.5
mA
IN Shutdown Supply Current SHDN = GND 250 μA
ERROR AMPLIFIER
Feedback Voltage Level to produce V
COMP
= 1.24V 1.227 1.253 V
FB Input Bias Current V
FB
= 1.24V 225 nA
Transconductance 110 450 μS
Shutdown FB Input Voltage SHDN = GND 0.05 0.15 V
OSCILLATOR
Frequency (f
OSC
) 750 1250 kHz
Maximum Duty Cycle 89 96 %
P1-P3P4-P6P7-P9P10-P12

MAX17112ETB+T

Mfr. #:
Buy MAX17112ETB+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators Step-Up DC/DC Converter
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet