LT1372 Linear Technology, LT1372 Datasheet - Page 4

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

LT1372/LT1377
TYPICAL PERFORMANCE CHARACTERISTICS
4
1.6
2.4
2.2
2.0
1.8
1.4
1.2
1.0
0.8
0.6
0.4
20
18
16
14
12
10
–2
–3
–4
–5
–1
8
6
4
2
0
5
4
3
2
1
0
–50
–50
–1
Shutdown Delay and Threshold
vs Temperature
S/S Pin Input Current
vs Voltage
V
Clamp Voltage vs Temperature
C
V
SHUTDOWN DELAY
IN
–25
–25
Pin Threshold and High
0
= 5V
1
SHUTDOWN THRESHOLD
0
0
TEMPERATURE ( C)
S/S PIN VOLTAGE (V)
TEMPERATURE ( C)
2
V
C
25
25
HIGH CLAMP
3
V
C
50
50
THRESHOLD
4
5
75
75
6
100 125 150
100 125 150
W
7
LT1372 • G04
LT1372 • G10
LT1372 • G07
8
U
9
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
110
100
800
700
600
500
400
300
200
100
90
80
70
60
50
40
30
20
10
0
–50
3.0
2.5
2.0
1.5
0.5
1.0
0
Feedback Input Current
vs Temperature
Switching Frequency
vs Feedback Pin Voltage
0
–50
Minimum Synchronization
Voltage vs Temperature
0.1
V
–25
FB
f
f
SYNC
SYNC
–25
=V
0.2
FEEDBACK PIN VOLTAGE (V)
REF
= 700kHz (LT1372)
= 1.4MHz (LT1377)
0
0.3
TEMPERATURE ( C)
0
TEMPERATURE ( C)
25
0.4
25
0.5
50
LT1377
LT1372
50
0.6
75
75
0.7
100
0.8
100
LT1372 • G08
LT1372 • G11
125
0.9
LT1372 • G05
125
150
1.0
150
–100
–200
1200
–300
2000
1800
1600
1400
1000
400
800
600
400
–10
–20
–30
–40
–50
300
200
100
200
0
0
0
–50
–50
Error Amplifier Transconductance
vs Temperature
Negative Feedback Input Current
vs Temperature
Error Amplifier Output Current
vs Feedback Pin Voltage
–0.3
–25
V
–25
NFB
FEEDBACK PIN VOLTAGE (V)
=V
125 C
0
0
–0.2
NFR
TEMPERATURE ( C)
TEMPERATURE ( C)
25
25
–0.1
50
50
25 C
–55 C
75
75
V
REF
g
m
100 125 150
100 125 150
=
V (FB)
LT1372 • G09
LT1372 • G12
LT1372 • G06
I (V
0.1
C
)