LT3798
ELECTRICAL CHARACTERISTICS
PARAMETER
SENSE Current Limit Threshold
Minimum SENSE Current Limit Threshold
Minimum SENSE Current Limit Threshold
SENSE Input Bias Current
FB Voltage
FB voltage Line Regulation
FB Pin Bias Current
FB Error Amplifier Voltage Gain
FB Error Amplifier Transconductance
Current Error Amplifier Voltage Gain
Current Error Amplifier Transconductance
Current Loop Voltage Gain
DCM Current Turn-On Threshold
Maximum Oscillator Frequency
Minimum Oscillator Frequency
Minimum Oscillator Frequency
Backup Oscillator Frequency
Linear Regulator
INTV
CC
Regulation Voltage
Dropout (V
IN
-INTV
CC
)
Current Limit
Current Limit
Gate Driver
t
r
GATE Driver Output Rise Time
t
f
GATE Driver Output Fall Time
GATE Output Low (V
OL
)
GATE Output High (V
OH
)
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT3798E is guaranteed to meet specified performance from
0°C to 125°C junction temperature. Specification over the –40°C and
INTV
CC
-
50mV
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
3798I is guaranteed to meet specified performance from –40°C to 125°C
operating junction temperature range.
Note 3:
Current flows out of the FB pin.
C
L
= 3300pF 10% to 90%
,
C
L
= 3300pF 90% to 10%
,
18
18
0.01
ns
ns
V
V
No Load
I
INTVCC
= –10mA, V
IN
= 10V
Below Undervoltage Threshold
Above Undervoltage Threshold
12
80
9.8
10
500
25
120
10.4
900
V
mV
mA
mA
10V < V
IN
< 35V
(Note 3), FB = 1V
ΔV
VC
/ΔV
FB
, CTRL1=1V, CTRL2=2V, CTRL3=2V
ΔI = 5μA
ΔV
COMP
+/ΔV
COMP
–, CTRL1 = 1V, CTRL2 = 2V, CTRL3 = 2V
ΔI = 5μA
ΔV
CTRL
/ΔV
SENSE
,1000pF Cap from COMP
+
to COMP
–
Current Out of Pin
COMP
+
= 0.95V, V
IN_SENSE
= 150μA
COMP
+
= 0V, V
FB
<V
OVP
COMP
+
= 0V, V
FB
>V
OVP
4.05
CONDITIONS
V
IN_SENSE
= 150μA
V
IN_SENSE
= 34μA
V
IN_SENSE
= 21μA
Current Out of Pin, SENSE = 0V
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 18V, INTV
CC
= 11V, unless otherwise noted.
MIN
96
TYP
102
14
4
15
1.22
1.25
0.01
4.25
180
170
100
50
21
80
150
4
0.5
20
1.28
0.03
4.4
MAX
107
UNITS
mV
mV
mV
μA
V
%/V
μA
V/V
UMHOS
V/V
UMHOS
V/V
μA
kHz
kHz
kHz
kHz
3798f
3
LINER [ LINEAR TECHNOLOGY ]
