參數(shù)資料
型號： LT1172S8
廠商： Linear Technology Corporation
英文描述： Quadruple 2-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs 16-PDIP 0 to 70
中文描述： 100kHz時，5A條，包2.5a和1.25A的高效率開關(guān)穩(wěn)壓器
文件頁數(shù)： 3/20頁
文件大小： 266K
代理商： LT1172S8
3
LT1170/LT1171/LT1172
SYMBOL
V
REF
PARAMETER
Reference Voltage
CONDITIONS
Measured at Feedback Pin
V
C
= 0.8V
V
FB
= V
REF
MIN
1.224
1.214
TYP
1.244
1.244
350
MAX
1.264
1.274
750
1100
6000
7000
350
400
2.30
0.52
0.03
UNITS
V
V
G
I
B
Feedback Input Current
nA
nA
G
g
m
Error Amplifier
Transconductance
Error Amplifier Source or
Sink Current
Error Amplifier Clamp
Voltage
Reference Voltage Line
Regulation
Error Amplifier Voltage Gain
Minimum Input Voltage (Note 5)
Supply Current
Control Pin Threshold
I
C
=
±
25
μ
A
3000
2400
150
120
1.80
0.25
4400
μ
mho
μ
mho
G
V
C
= 1.5V
200
μ
A
μ
A
V
V
G
Hi Clamp, V
FB
= 1V
Lo Clamp, V
FB
= 1.5V
3V
≤
V
IN
≤
V
MAX
V
C
= 0.8V
0.9V
≤
V
C
≤
1.4V
0.38
G
%/V
A
V
500
800
2.6
6
0.9
V/V
G
3.0
9
1.08
1.25
0.54
V
I
Q
3V
≤
V
IN
≤
V
MAX
, V
C
= 0.6V
Duty Cycle = 0
mA
0.8
0.6
0.4
V
V
V
G
Normal/Flyback Threshold
on Feedback Pin
Flyback Reference Voltage
(Note 5)
Change in Flyback Reference
Voltage
Flyback Reference Voltage
Line Regulation (Note 5)
Flyback Amplifier
Transconductance (g
m
)
Flyback Amplifier Source
and Sink Current
Output Switch Breakdown
Voltage
0.45
V
FB
I
FB
= 50
μ
A
15.0
14.0
4.5
16.3
17.6
18.0
9
V
V
V
G
0.05
≤
I
FB
≤
1mA
6.8
I
FB
= 50
μ
A
7V
≤
V
IN
≤
V
MAX
I
C
=
±
10
μ
A
0.01
0.03
%/V
150
300
650
μ
mho
V
C
= 0.6V
I
FB
= 50
μ
A
3V
≤
V
IN
≤
V
MAX
,
I
SW
= 1.5mA
Source
Sink
LT1170/LT1171/LT1172
LT1170HV/LT1171HV/LT1172HV
LT1172S8
G
G
15
25
65
75
60
32
40
90
90
80
0.15
0.30
0.60
8
4
2
70
70
μ
A
μ
A
V
V
V
A/V
A/V
A/V
BV
G
G
G
V
SAT
Output Switch
“On” Resistance (Note 3)
LT1170
LT1171
LT1172
LT1170
LT1171
LT1172
Duty Cycle = 50%
Duty Cycle = 50%
Duty Cycle = 80% (Note 4)
Duty Cycle = 50%
Duty Cycle = 50%
Duty Cycle = 80% (Note 4)
Duty Cycle = 50%
Duty Cycle = 50%
Duty Cycle = 80% (Note 4)
G
G
G
0.24
0.50
1.00
Control Voltage to Switch
Current Transconductance
I
LIM
Switch Current Limit
(LT1170)
T
J
≥
25
°
C
T
J
<
25
°
C
G
G
G
5
5
4
10
11
10
5.0
5.5
5.0
3.0
3.5
2.5
A
A
A
A
A
A
A
A
A
(LT1171)
T
J
≥
25
°
C
T
J
<
25
°
C
G
G
G
2.5
2.5
2.0
1.25
1.25
1.00
(LT1172)
T
J
≥
25
°
C
T
J
<
25
°
C
G
G
G
The
G
denotes the specifications which apply over the full operating tem-
perature range, otherwise specifications are at T
A
= 25
°
C. V
IN
= 15V, V
C
= 0.5V, V
FB
= V
REF
, output pin open, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
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