LT1372/LT1377
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S and NFB pins open, unless otherwise noted.
SYMBOL PARAMETER
Maximum Switch Duty Cycle
CONDITIONS
MIN
TYP
95
MAX
UNITS
%
●
90
Switch Current Limit Blanking Time
Output Switch Breakdown Voltage
130
47
260
ns
BV
LT1372/LT1377
LT1372HV
●
●
35
V
0°C ≤ T ≤ 125°C
42
40
47
V
V
J
–40°C ≤ T < 0°C (I Grade)
J
V
Output Switch “On” Resistance
Switch Current Limit
I
= 1A
SW
●
0.5
0.8
Ω
SAT
I
Duty Cycle = 50%
Duty Cycle = 80% (Note 1)
●
●
1.5
1.3
1.9
1.7
2.7
2.5
A
A
LIM
∆I
∆I
Supply Current Increase During Switch On-Time
15
25
mA/A
IN
SW
Control Voltage to Switch Current
Transconductance
2
A/V
Minimum Input Voltage
Supply Current
●
●
2.4
4
2.7
5.5
V
I
2.7V ≤ V ≤ 25V
mA
Q
IN
Shutdown Supply Current
2.7V ≤ V ≤ 25V, V ≤ 0.6V
IN S/S
0°C ≤ T ≤ 125°C
●
12
30
50
µA
µA
J
–40°C ≤ T < 0°C (I Grade)
J
Shutdown Threshold
2.7V ≤ V ≤ 25V
●
●
●
0.6
5
1.3
12
2
V
µs
µA
IN
Shutdown Delay
25
15
S/S Pin Input Current
Synchronization Frequency Range
0V ≤ V ≤ 5V
–10
S/S
LT1372
LT1377
●
●
600
1.2
800
1.6
kHz
MHz
The
●
denotes specifications which apply over the full operating
Note 1: For duty cycles (DC) between 50% and 90%, minimum
guaranteed switch current is given by I = 0.667 (2.75 – DC).
temperature range.
LIM
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage
vs Switch Current
Switch Current Limit
vs Duty Cycle
Minimum Input Voltage
vs Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
3.0
2.8
2.6
2.4
2.2
2.0
1.8
150°C
100°C
25°C
25°C AND
125°C
–55°C
–55°C
75 100
125 150
0.2 0.4 0.6 0.8 1.0 1.2 1.4
SWITCH CURRENT (A)
1.6 1.8 2.0
0
10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
–50 –25
0
25 50
0
TEMPERATURE (°C)
LT1372 • G02
LT1372 • G03
LT1372 • G01
3
Linear [ Linear ]
