Datasheet

LT3741/LT3741-1
3
37411fe
For more information www.linear.com/LT3741
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 unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range
l
6 36 V
V
IN
Pin Quiescent Current (Note 2)
Non-Switching Operation
Shutdown Mode
Not Switching
V
EN/UVLO
= 0V, R
T
= 40kΩ
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
SYNC Pin Threshold 1 V
CTRL1 Pin Control Range 0 1.5 V
CTRL1 Pin Current CTRL1 = 1.5V –100 nA
Reference
Reference Voltage (V
REF
Pin)
l
1.94 2 2.06 V
Inductor Current Sensing
Full Range SENSE
+
to SENSE
–
V
CTRL1
= 1.5V
l
48 51 54 mV
SENSE
+
Pin Current V
SENSE
+
= 6V 50 nA
SENSE
–
Pin Current With V
OUT
~ 4V, V
CTRL1
= 0V, 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
Non-Overlap time HG to LG (Note 3) 100 ns
Non-Overlap time LG to HG (Note 3) 60 ns
Minimum On-Time LG (Note 3) 50 ns
Minimum On-Time HG (Note 3) 80 ns
Minimum Off-Time LG (Note 3) 65 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
2.3
1
Ω
Ω
Switching Frequency
f
SW
R
T
= 40kΩ
R
T
= 200kΩ
l
900
185
1000
200
1070
233
kHz
kHz
Soft-Start
Charging Current 11 µA
Voltage Regulation Amplifier
Input Bias Current FB = 1.3V 850 nA
g
m
800 µA/V
Feedback Regulation Voltage CTRL1 = 1.5V, I
SENSE
–
= 23µA, V
SENSE
+
= 2V
l
1.192 1.21 1.228 V