Datasheet

LT3748
5
3748fb
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typical perForMance characteristics
Error Amplifier Transconductance
vs Temperature
Error Amplifier Output Current
vs R
REF
Pin Voltage
SENSE Pin Threshold
vs Temperature
EN/UVLO Current vs Temperature
EN/UVLO Threshold
vs Temperature TC Pin Voltage vs Temperature
T
A
= 25°C, unless otherwise noted.
Maximum Discontinuous Off-Time
vs Temperature
GATE Rise and Fall Time vs Charge
GATE Rise and Fall Time
vs INTV
CC
Voltage
TEMPERATURE (°C)
–55
0
EN/UVLO CURRENT (µA)
0.5
1.0
1.5
2.0
0 50
100
150
3748 G10
2.5
3.0
–25 25
75
125
V
EN/UVLO
= 1.1V
V
EN/UVLO
= 0.9V
V
EN/UVLO
= 1.3V
TEMPERATURE (°C)
–55
EN/UVLO THRESHOLD (V)
1.20
1.30
150
3748 G11
1.10
1.00
0
50
100
–25
25
75
125
1.40
1.15
1.25
1.05
1.35
TEMPERATURE (°C)
–55
TC VOLTAGE (V)
0.5
0.6
0.7
150
3748 G12
0.4
0.3
0
0
50
100
–25
25
75
125
0.2
0.1
0.9
0.8
TEMPERATURE (°C)
–55
100
TRANSCONDUCTANCE (µmhos)
110
130
140
150
200
170
0
50
75
3748 G13
120
180
190
160
–25 25
100
125
150
V
IN
= 100V
V
IN
= 6V
V
REF
(V)
0
I
VC
(µA)
0
20
40
60
2.0
3748 G14
–20
–40
–10
10
30
50
–30
–50
–60
0.5
1.0
1.5
2.5
150°C
100°C
25°C
–50°C
TEMPERATURE (°C)
–55
SENSE THRESHOLD (mV)
80
120
150
3748 G15
40
0
0
50
100
–25
25
75
125
160
60
100
20
140
OVERCURRENT
V
C
= 2.2V
V
C
= 0.2V
TEMPERATURE (°C)
–55
20
MAXIMUM DISCONTINUOUS OFF-TIME (µs)
21
23
24
25
30
27
0
50
75
3748 G16
22
28
29
26
–25 25
100
125
150
TOTAL GATE CHARGE (nC)
0
0
GATE RISE AND FALL TIME (ns)
AVERAGE GATE SOURCE, SINK CURRENT (A)
10
20
30
40
20
40 60 80
3748 G17
100 120
50
0
0.5
1.0
1.5
2.0
RISE TIME
FALL TIME
Q = C • V
V
INTVCC
= 7V
t
r
, t
f
10% TO 90%
AVERAGE
CURRENT
V
INTVCC
(V)
0
GATE RISE AND FALL TIME (ns)
10
15
20
3748 G18
5
0
5
10
15
25
20
FALLING
RISING
C
GATE
= 3.3nF
t
r
, t
f
10% TO 90%
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