LT1373
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S and NFB pins open, unless otherwise noted.
SYMBOL PARAMETER
BV Output Switch Breakdown Voltage
CONDITIONS
MIN
TYP
MAX
UNITS
LT1373
LT1373HV
●
●
35
47
V
0°C ≤ T ≤ 125°C
42
40
47
V
V
J
–40°C ≤ T ≤ 0°C (I Grade)
J
V
SAT
Output Switch “On” Resistance
I
= 1A
SW
●
0.5
0.85
Ω
I
Switch Current Limit
Duty Cycle = 50%
Duty Cycle = 80% (Note 2)
●
●
1.5
1.3
1.9
1.7
2.7
2.5
A
A
LIM
∆I
IN
Supply Current Increase During Switch On-Time
10
20
mA/A
∆I
SW
Control Voltage to Switch Current
Transconductance
2
A/V
Minimum Input Voltage
Supply Current
●
●
2.4
1
2.7
1.5
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
IN
Shutdown Delay
100
15
S/S Pin Input Current
Synchronization Frequency Range
0V ≤ V ≤ 5V
–10
300
µA
S/S
340
kHz
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: For duty cycles (DC) between 50% and 90%, minimum
guaranteed switch current is given by I = 0.667 (2.75 – DC).
LIM
U W
TYPICAL PERFOR A CE 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
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
SWITCH CURRENT (A)
75 100
0
10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
–50 –25
0
25 50
125 150
TEMPERATURE (°C)
LT1373 • G01
LT1373 • G02
LT1373 • G03
3
Linear [ Linear ]
