Datasheet
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