LT1172CS8#PBF Linear Technology, LT1172CS8#PBF Datasheet - Page 7
LT1172CS8#PBF
Manufacturer Part Number
LT1172CS8#PBF
Description
IC SWTCHNG REG HI-EFF 8-SOIC
Manufacturer
Linear Technology
Type
Step-Down (Buck), Step-Up (Boost), Inverting, Cuk, Flyback, Forward Converterr
Datasheet
1.LT1172CN8PBF.pdf
(24 pages)
Specifications of LT1172CS8#PBF
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
0°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Power - Output
100W
Primary Input Voltage
60V
No. Of Outputs
1
Output Voltage
40V
Output Current
3.5A
No. Of Pins
8
Operating Temperature Range
0°C To +100°C
Msl
MSL 1 - Unlimited
Supply Voltage Range
3V To 40V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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