LT1372 Linear Technology, LT1372 Datasheet - Page 3

• Manufacturer Part Number: LT1372
• Description: 500kHz and 1MHz High Efficiency 1.5A Switching Regulators
• Manufacturer: Linear Technology

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