LT1172IN8 Linear Technology, LT1172IN8 Datasheet - Page 7

IC SWTCHNG REGULATOR HI-EFF 8DIP

LT1172IN8

Manufacturer Part Number
LT1172IN8
Description
IC SWTCHNG REGULATOR HI-EFF 8DIP
Manufacturer
Linear Technology
Type
Step-Down (Buck), Step-Up (Boost), Inverting, Cuk, Flyback, Forward Converterr
Datasheet

Specifications of LT1172IN8

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.25 ~ 40 V
Current - Output
1.25A
Frequency - Switching
100kHz
Voltage - Input
3 ~ 40 V
Operating Temperature
-40°C ~ 100°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Power - Output
100W
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1172IN8
Manufacturer:
LT
Quantity:
96
Part Number:
LT1172IN8
Manufacturer:
LT/凌特
Quantity:
20 000
Part Number:
LT1172IN8#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
TYPICAL PERFORMANCE CHARACTERISTICS
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
Shutdown Mode Supply Current
Idle Supply Current vs Temperature
Shutdown Thresholds
V
10 20 30
–50
–50
C
CURRENT (OUT OF V
= 0.6V
V
REGULATOR CURRENT DROPS
BELOW 300μA
–25
–25
C
VOLTAGE IS REDUCED UNTIL
V
C
TEMPERATURE (°C)
TEMPERATURE (°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
1170/1/2 G10
1170/1/2 G13
1170/1/2 G16
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
–75
0
Error Amplifier Transconductance
Feedback Pin Clamp Voltage
2.2
2.0
1.8
1.6
1.4
1.2
1.0
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
25
–55°C
150°C
25°C
0.5 0.6 0.7 0.8 0.9 1.0
25
50
g
m
50
75 100 125
=
V (FB PIN)
75 100 125
I (V
C
1170/1/2 G11
1170/1/2 G14
PIN)
LT1170/LT1171/LT1172
1170/1/2 G17
150
150
–100
–200
–300
–400
1000
300
200
100
900
800
700
600
500
400
300
200
100
23
22
21
20
19
18
17
16
15
0
0
–75
0
0
Switch “Off” Characteristics
Isolated Mode Flyback
Reference Voltage
VC Pin Characteristics
V
V
FB
SUPPLY
= 3V
10 20 30
–50
V
= 1.5V (CURRENT INTO V
FB
0.5
= 0.8V (CURRENT OUT OF V
–25
SWITCH VOLTAGE (V)
V
V
TEMPERATURE (°C)
C
SUPPLY
= 15V
0
PIN VOLTAGE (V)
T
1.0
40
J
R
R
25
= 25°C
FB
R
FB
FB
50 60 70 80 90 100
= 500Ω
= 10k
= 1k
50
V
1.5
SUPPLY
= 40V
75 100 125
C
PIN)
V
= 55V
2.0
SUPPLY
C
PIN)
1170/1/2 G12
1170/1/2 G18
1170/1/2 G15
117012fg
7
2.5
150

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