LT3799
ELECTRICAL CHARACTERISTICS
PARAMETER
FB Pin Bias Current
CTRL1/CTRL2/CTRL3 Pin Bias Current
SENSE Current Limit Threshold
SENSE Input Bias Current
Current Loop Voltage Gain
CT Pin Charge Current
CT Pin Discharge Current
CT Pin Low Threshold
CT Pin High Threshold
CT Pin Low Hysteresis
FB Pin High Threshold
DCM Current Turn-On Threshold
Maximum Oscillator Frequency
Minimum Oscillator Frequency
Back-Up 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 LT3799E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
INTV
CC
– 0.05
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3799I is guaranteed to meet performance specifications from –40°C to
125°C operating junction temperature.
Note 3:
Current flows out of the FB pin.
C
L
= 3300pF 10% to 90%
,
C
L
= 3300pF 90% to 10%
,
20
20
0.05
ns
ns
V
V
INTV
CC
= –10mA
Below Undervoltage Threshold
Above Undervoltage Threshold
17
80
9.8
10
500
25
120
10.4
900
V
mV
mA
mA
Current Out of Pin
COMP
+
= 1.2V, V
IN_SENSE
= 1V
COMP
+
= 0V, V
IN_SENSE
1.22
Falling Threshold
Rising Threshold
Current Out of Pin, SENSE = 0V
∆V
CTRL
/∆V
SENSE
, 1000pF Cap from COMP
+
to COMP
–
CONDITIONS
(Note 3), FB = 1V
CTRL/CTRL2/CTRL3 = 1V
96
100
15
21
10
200
240
1.25
100
1.25
45
300
25
20
1.29
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 18V, unless otherwise noted.
MIN
TYP
100
MAX
600
±30
106
UNITS
nA
nA
mV
µA
V/V
µA
nA
mV
V
mV
V
µA
kHz
kHz
kHz
3799p
3
LINER [ LINEAR TECHNOLOGY ]
