參數(shù)資料
型號(hào)： 3745SN
廠商： Linear Technology Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開關(guān)穩(wěn)壓器
文件頁數(shù)： 3/32頁
文件大?。?/td> 309K
代理商： 3745SN
3
LT1374
1374fb
PARAMETER
Feedback Voltage (Adjustable)
CONDITIONS
MIN
2.39
2.36
4.94
4.90
7
TYP
2.42
MAX
2.45
2.48
5.06
5.10
14
0.03
UNITS
V
V
V
V
All Conditions
G
Sense Voltage (Fixed 5V)
5.0
All Conditions
G
SENSE Pin Resistance
Reference Voltage Line Regulation
10
0.01
k
%/V
5V
≤
V
IN
≤
25V (5V
≤
V
IN
≤
32V for LT1374HV)
Feedback Input Bias Current
Error Amplifier Voltage Gain
Error Amplifier Transconductance
G
0.5
400
2000
2
μ
A
(Notes 2, 8)
I (V
C
) =
±
10
μ
A (Note 8)
200
1500
1000
2700
3100
μ
Mho
μ
Mho
A/V
G
V
C
Pin to Switch Current Transconductance
Error Amplifier Source Current
Error Amplifier Sink Current
V
C
Pin Switching Threshold
V
C
Pin High Clamp
Switch Current Limit
Slope Compensation (Note 9)
Switch On Resistance (Note 7)
5.3
225
225
0.9
2.1
6
0.8
0.07
V
FB
= 2.1V or V
SENSE
= 4.4V
V
FB
= 2.7V or V
SENSE
= 5.6V
Duty Cycle = 0
G
140
140
320
320
μ
A
μ
A
V
V
A
A
%
%
kHz
kHz
%/V
G
V
C
Open, V
FB
= 2.1V or V
SENSE
= 4.4V, DC
≤
50%
DC = 80%
I
SW
= 4.5A
G
4.5
8.5
0.1
0.13
G
Maximum Switch Duty Cycle
V
FB
= 2.1V or V
SENSE
= 4.4V
90
86
460
440
93
93
500
G
Switch Frequency
V
C
Set to Give 50% Duty Cycle
540
560
0.15
1.3
5.5
3.0
35
140
1.4
4.0
50
75
75
100
2.46
0.60
0.7
2.2
1000
G
Switch Frequency Line Regulation
Frequency Shifting Threshold on FB Pin
Minimum Input Voltage (Note 3)
Minimum Boost Voltage (Note 4)
Boost Current (Note 5)
5V
≤
V
IN
≤
25V, (5V
≤
V
IN
≤
32V for LT1374HV)
f = 10kHz
G
0
G
0.8
1.0
5.0
2.3
20
90
0.9
3.2
20
V
V
V
G
I
SW
≤
4.5A
I
SW
= 1A
I
SW
= 4.5A
V
BIAS
= 5V
V
BIAS
= 5V
V
SHDN
= 0V, V
IN
≤
25V, V
SW
= 0V, V
C
Open
G
G
G
mA
mA
mA
mA
μ
A
μ
A
μ
A
μ
A
V
IN
Supply Current (Note 6)
BIAS Supply Current (Note 6)
Shutdown Supply Current
G
G
G
V
SHDN
= 0V, V
IN
≤
32V, V
SW
= 0V, V
C
Open
30
G
Lockout Threshold
Shutdown Thresholds
V
C
Open
V
C
Open Device Shutting Down
Device Starting Up
G
2.3
0.13
0.25
2.38
0.37
0.45
1.5
V
V
V
V
G
G
Synchronization Threshold
Synchronizing Range
SYNC Pin Input Resistance
G
580
kHz
k
40
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Gain is measured with a V
C
swing equal to 200mV above the
switching threshold level to 200mV below the upper clamp level.
Note 3:
Minimum input voltage is not measured directly, but is guaranteed
by other tests. It is defined as the voltage where internal bias lines are still
regulated so that the reference voltage and oscillator frequency remain
constant. Actual minimum input voltage to maintain a regulated output will
depend on output voltage and load current. See Applications Information.
Note 4:
This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
The
G
denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
J
= 25
°
C. V
IN
= 15V, V
C
= 1.5V, Boost = V
IN
+ 5V, switch open, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
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