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LT3743
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = 12V, V EN/UVLO = 5V, V SYNC = 0V, V CTRL_SEL = 0V, V PWM = 2V,
unless otherwise noted.
PARAMETER
Input Voltage Range
V IN Pin Quiescent Current (Note 3)
Non-Switching Operation
Shutdown Mode
EN/UVLO Pin Falling Threshold
CONDITIONS
V PWM = V CTRL_SEL = 0V, Not Switching, R T = 40k
V EN/UVLO = 0V
l
MIN
6
1.49
TYP
1.8
0.1
1.55
MAX
36
2.5
1
1.61
UNITS
V
mA
μA
V
EN/UVLO Hysteresis
130
mV
EN/UVLO Pin Current
PWM Pin Threshold
CTRL_SEL Threshold
SYNC Pin Threshold
CTRL_H and CTRL_L Pin Control Range
CTRL_H and CTRL_L Pin Current
V IN = 6V, EN/UVLO = 1.45V
0
5.5
1.0
1.0
1.0
100
1.5
μA
V
V
V
V
nA
Reference
Reference Voltage (V REF Pin)
l
1.96
2
2.04
V
Inductor Current Sensing
Full Range SENSE + to SENSE –
SENSE + Pin Current
V CTRL_H = 1.5V, V SENSE– = 6V
V SENSE + =V
– = 6V
SENSE
l
48
51
50
54
mV
nA
SENSE – Pin Current
V SENSE+ = V SENSE– = 6V
10
μA
Internal V CC Regulator (V CC_INT Pin)
Regulation Voltage
l
4.7
5
5.2
V
NMOS FET Driver (Note 2)
Non-Overlap time HG to LG
Non-Overlap time LG to HG
100
60
ns
ns
Minimum On-Time LG
Minimum On-Time HG
Minimum Off-Time LG
High Side Driver Switch On-Resistance
Gate Pull Up
Gate Pull Down
Low Side Driver Switch On-Resistance
Gate Pull Up
Gate Pull Down
(Note 3)
(Note 3)
(Note 3)
V CBOOT – V SW = 5V
V CC_INT = 5V
50
80
60
2.3
1.3
2.5
1.3
ns
ns
ns
Ω
Ω
Ω
Ω
Switching Frequency
f SW
R T = 40kΩ
R T = 200kΩ
l
900
190
1000
200
1070
233
kHz
kHz
Soft-Start
Charging Current
Voltage Regulation Amplifier
Input Bias Current
g m
5.5
1
200
μA
nA
μA/V
Feedback Regulation Voltage
V CTRL_H = 0V, V CTRL_L = 2V, V SENSE+ = 2V
l
0.945
1
1.025
V
3743fd
3
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