Datasheet

LT3743
3
3743fd
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 CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 6 36 V
V
IN
Pin Quiescent Current (Note 3)
Non-Switching Operation
Shutdown Mode
V
PWM
= V
CTRL_SEL
= 0V, Not Switching, R
T
= 40k
V
EN/UVLO
= 0V
l
1.8
0.1
2.5
1
mA
µA
EN/UVLO Pin Falling Threshold 1.49 1.55 1.61 V
EN/UVLO Hysteresis 130 mV
EN/UVLO Pin Current V
IN
= 6V, EN/UVLO = 1.45V 5.5 µA
PWM Pin Threshold 1.0 V
CTRL_SEL Threshold 1.0 V
SYNC
Pin Threshold 1.0 V
CTRL_H and CTRL_L Pin Control Range 0 1.5 V
CTRL_H and CTRL_L Pin Current 100 nA
Reference
Reference Voltage (V
REF
Pin)
l
1.96 2 2.04 V
Inductor Current Sensing
Full Range SENSE
+
to SENSE
–
V
CTRL_H
= 1.5V, V
SENSE
–
= 6V
l
48 51 54 mV
SENSE
+
Pin Current V
SENSE
+
= V
SENSE
–
= 6V 50 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 100 ns
Non-Overlap time LG to HG 60 ns
Minimum On-Time LG (Note 3) 50 ns
Minimum On-Time HG (Note 3) 80 ns
Minimum Off-Time LG (Note 3) 60 ns
High Side Driver Switch On-Resistance
Gate Pull Up
Gate Pull Down
V
CBOOT
– V
SW
= 5V
2.3
1.3
Ω
Ω
Low Side Driver Switch On-Resistance
Gate Pull Up
Gate Pull Down
V
CC_INT
= 5V
2.5
1.3
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 5.5 µA
Voltage Regulation Amplifier
Input Bias Current 1 nA
g
m
200 µA/V
Feedback Regulation Voltage V
CTRL_H
= 0V, V
CTRL_L
= 2V, V
SENSE
+
= 2V
l
0.945 1 1.025 V