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LT3799
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 = 18V, unless otherwise noted.
PARAMETER
FB Pin Bias Current
CTRL1/CTRL2/CTRL3 Pin Bias Current
Maximum SENSE Current Limit Threshold
SENSE Input Bias Current
Current Loop Voltage Gain
CONDITIONS
(Note 3), FB = 1V
CTRL/CTRL2/CTRL3 = 1V
Current Out of Pin, SENSE = 0V
?V CTRL / ?V SENSE , 1000pF Cap from COMP + to COMP –
MIN
96
TYP
100
100
15
21
MAX
600
±25
106
UNITS
nA
nA
mV
μA
V/V
CT Pin Charge Current
CT Pin Discharge Current
10
200
μA
nA
CT Pin Low Threshold
CT Pin High Threshold
CT Pin Low Hysteresis
Falling Threshold
Rising Threshold
240
1.25
100
mV
V
mV
FB Pin High Threshold
DCM Current Turn-On Threshold
Current Out of Pin
1.22
1.25
45
1.29
V
μA
Maximum Oscillator Frequency
COMP + = 1.2V, V
IN_SENSE = 1V
300
kHz
Minimum Oscillator Frequency
Back-Up Oscillator Frequency
COMP + = 0V, V
IN_SENSE
25
20
kHz
kHz
Linear Regulator
INTV CC Regulation Voltage
Dropout (V IN – INTV CC )
INTV CC = –10mA; Below V IN Turn-Off Voltage
9.8
10
750
10.4
1150
V
mV
Current Limit
Current Limit
Below Undervoltage Threshold
Above Undervoltage Threshold
15
80
25
120
mA
mA
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 )
C L = 3300pF, 10% to 90%
C L = 3300pF, 90% to 10%
INTV CC
– 0.05
20
20
0.05
ns
ns
V
V
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
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.
3799fa
3
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