LT1172MJ8 Linear Technology, LT1172MJ8 Datasheet - Page 6

• Manufacturer Part Number: LT1172MJ8
• Description: SP-SWREG/Monolithic, 100kHz 5A 2.5A And 1.25A High Efficiency Switching Regulato
• Manufacturer: Linear Technology

LT1 170/LT1 171/LT1172
TYPICAL PERFOR A CE CHARACTERISTICS
6
200
180
160
140
120
100
400
350
300
250
200
150
100
80
60
40
20
11
10
50
0
9
8
7
6
5
4
3
2
1
0
–75
–75
0
Idle Supply Current vs
Temperature
Shutdown Thresholds
Shutdown Mode Supply Current
V
–50
10 20 30
–50
C
CURRENT (OUT OF V
= 0.6V
V
REGULATOR CURRENT DROPS
BELOW 300 A
–25
–25
C
VOLTAGE IS REDUCED UNTIL
V
TEMPERATURE ( C)
TEMPERATURE ( C)
C
V
V
0
T
0
PIN VOLTAGE (mV)
SUPPLY
SUPPLY
J
VOLTAGE
40
= 150 C
–55 C T
25
25
50 60 70 80 90 100
= 60V
= 3V
50
50
C
PIN)
J
75 100 125
75 100 125
125 C
W
1170/1/2 G10
1170/1/2 G13
1170/1/2 G16
U
150
150
– 400
– 350
– 300
– 250
– 200
– 150
–100
– 50
0
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
450
400
350
300
250
200
150
100
500
50
0
0
0
–75
Feedback Pin Clamp Voltage
2.2
2.0
1.8
1.6
1.4
1.2
1.0
Error Amplifier Transconductance
0.1 0.2 0.3
–75
–50
Flyback Blanking Time
–50
–25
FEEDBACK CURRENT (mA)
JUNCTION TEMPERATURE ( C)
–25
TEMPERATURE ( C)
0
0.4
0
–55 C
150 C
25
25 C
0.5 0.6 0.7 0.8 0.9 1.0
25
50
g
50
m
75 100 125
=
75 100 125
V (FB PIN)
I (V
1170/1/2 G14
C
1170/1/2 G11
PIN)
1170/1/2 G17
150
150
1000
–100
–200
–300
–400
900
800
700
600
500
400
300
200
100
300
200
100
23
22
21
20
19
18
17
16
15
0
0
–75
0
Switch “Off” Characteristics
Isolated Mode Flyback
Reference Voltage
0
V
V
V
C
SUPPLY
= 3V
FB
10 20 30
–50
Pin Characteristics
V
= 1.5V (CURRENT INTO V
FB
0.5
–25
= 0.8V (CURRENT OUT OF V
SWITCH VOLTAGE (V)
TEMPERATURE ( C)
V
V
SUPPLY
= 15V
C
0
PIN VOLTAGE (V)
T
40
1.0
R
J
FB
R
25
R
= 25 C
FB
FB
50 60 70 80 90 100
= 500
= 10k
= 1k
50
V
SUPPLY
= 40V
1.5
75 100 125
C
PIN)
V
= 55V
SUPPLY
2.0
C
PIN)
1170/1/2 G12
1170/1/2 G18
1170/1/2 G15
117012ff
150
2.5