LT1172CS8 Linear Technology, LT1172CS8 Datasheet - Page 8

IC SWTCHNG REG HI-EFF 8-SOIC

LT1172CS8

Manufacturer Part Number
LT1172CS8
Description
IC SWTCHNG REG HI-EFF 8-SOIC
Manufacturer
Linear Technology
Type
Step-Down (Buck), Step-Up (Boost), Inverting, Cuk, Flyback, Forward Converterr
Datasheet

Specifications of LT1172CS8

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
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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TYPICAL PERFORMANCE CHARACTERISTICS
LT1170/LT1171/LT1172
BLOCK DIAGRAM
8
–1000
7000
6000
5000
4000
3000
2000
1000
0
1k
Transconductance of Error
Amplifier
ALWAYS CONNECT E1 TO THE GROUND PIN ON MINIDIP, 8- AND 16-PIN SURFACE MOUNT PACKAGES.
E1 AND E2 INTERNALLY TIED TO GROUND ON TO-3 AND TO-220 PACKAGES.
FB
10k
SELECT
100kHz
MODE
1.24V
2.3V
REG
OSC
REF
V
IN
FREQUENCY (Hz)
+
100k
ERROR
AMP
g
m
1M
SHUTDOWN
CIRCUIT
1170/1/2 G19
10M
LOGIC
COMP
0.15V
–30
0
30
60
90
120
150
180
210
V
C
(LT1170 AND LT1171 ONLY)
FLYBACK
ERROR
AMP
GAIN
CURRENT
DRIVER
ANTI-
SAT
AMP
500
490
480
470
460
450
440
430
420
410
400
6
–50
Normal/Flyback Mode Threshold on
Feedback Pin
+
16V
–25
SWITCH
5A, 75V
FEEDBACK PIN VOLTAGE
FEEDBACK PIN CURRENT
SWITCH
(AT THRESHOLD)
0
OUT
(AT THRESHOLD)
E1
TEMPERATURE (°C)
25
0.02Ω
(0.04Ω
(0.16Ω
50
LT1172
LT1171)
LT1172)
75
100 125 150
E2
0.16Ω
1170/1/2 G20
1170/1/2 BD
–24
–22
–20
–18
–16
–14
–12
–10
–8
–6
–4
117012fg

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