Datasheet
LT3763
3
3763fa
For more information www.linear.com/LT3763
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
EN/UVLO
= 5V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
PWM Pin Threshold (Falling Edge) 1.4 1.5 1.6 V
PWM Pin Hysteresis 675 mV
CTRL1 Pin Current V
CTRL1
= 1.5V 20 nA
CTRL2 Pin Current V
CTRL1
= 1.5V, V
CTRL2
= 1.5V, V
FBIN
= 2V 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
= 2V, V
CTRL2
> 2V, V
SS
= V
FBIN
= 2V, V
C
= 1.2V
l
48 51 54 mV
SENSE
+
Pin Current V
SENSE
+
= V
SENSE
–
= 4V –20 µA
SENSE
–
Pin Current V
SENSE
+
= V
SENSE
–
= 4V, V
CTRL1
= 1.5V –40 µA
Internal V
CC
Regulator (INTV
CC
Pin)
Regulation Voltage I
LOAD
= 10mA
l
4.8 5 5.2 V
Current Limit V
INTVCC
= 0V 60 mA
NMOS FET Driver
Non-Overlap Time TG to BG 42 ns
Non-Overlap Time BG to TG 44 ns
Minimum On-Time BG (Note 4) 50 ns
Minimum On-Time TG (Note 4) 55 ns
Minimum Off-Time BG (Note 4) 140 ns
High Side Driver Switch On-Resistance
Gate Pull-Up
Gate Pull-Down
V
CBOOST
– V
SW
= 5V
2.2
1.3
Ω
Ω
Low Side Driver Switch On-Resistance
Gate Pull-Up
Gate Pull-Down
V
INTVCC
= 5V
2.2
1
Ω
Ω
Switching Frequency R
T
= 40kΩ
R
T
= 221kΩ
l
930
180
1000
200
1070
220
kHz
kHz
Soft-Start
Charging Current 11 µA
Voltage Regulation Amplifier
Input Bias Current V
FB
= 1.3V 750 nA
g
m
850 µA/V
Feedback Regulation Voltage V
SENSE
+
= V
SENSE
–
= V
CTRL1
= 2V
l
1.188 1.206 1.224 V
FAULT Comparator
Upper FAULT Threshold (FB Rising)
l
1.137 1.16 1.183 V
Upper FAULT Threshold Hysteresis 40 mV
Lower FAULT Threshold (FB Falling)
l
0.24 0.25 0.26 V
Lower FAULT Threshold Hysteresis 40 mV
FAULT Pull-Down Current V
FAULT
= 2V, V
FB
= 0V 8 mA
Input Voltage Regulation
FBIN Pin Current V
FBIN
= 1.5V 150 nA
Sense Voltage
(V
SENSE
+
– V
SENSE
–
)
V
FBIN
= 1.22V, V
SENSE
–
= 4V
V
FBIN
= 1.26V, V
SENSE
–
= 4V
10
45
mV
mV