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參數資料
| 型號： | LT1959I |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/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安培開關穩(wěn)壓器 |
| 文件頁數： | 3/24頁 |
| 文件大?。?/td> | 292K |
| 代理商： | LT1959I |
3
LT1959
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
A
= 25
°
C, T
J
= 25
°
C, V
IN
= 5V, V
C
= 1.5V, Boost = V
IN
+ 5V, switch open, unless
otherwise noted.
PARAMETER
Switch On Resistance (Note 7)
CONDITIONS
I
SW
= 4.5A
MIN
TYP
0.07
MAX
0.1
0.13
UNITS
%
%
G
Maximum Switch Duty Cycle
V
FB
= 1.05V
90
86
460
440
93
93
500
G
Switch Frequency
V
C
Set to Give 50% Duty Cycle
540
560
0.15
1.0
4.3
3.0
35
140
5.4
50
75
2.46
0.60
0.7
2.2
1000
kHz
kHz
%/V
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)
4.3V
≤
V
IN
≤
15V
f = 10kHz
G
0
G
0.5
0.7
4.0
2.3
20
90
3.8
15
V
V
V
G
I
SW
≤
4.5A
I
SW
= 1A
I
SW
= 4.5A
G
G
G
mA
mA
mA
μ
A
μ
A
Input Supply Current (Note 6)
Shutdown Supply Current
G
V
SHDN
= 0V, V
SW
= 0V, V
C
Open
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.
Note 5:
Boost current is the current flowing into the boost pin with the pin
held 5V above input voltage. It flows only during switch on time.
Note 6:
Input supply current is the bias current drawn by the input pin
with switching disabled.
Note 7:
Switch on resistance is calculated by dividing V
IN
to V
SW
voltage
by the forced current (4.5A). See Typical Performance Characteristics for
the graph of switch voltage at other currents.
The
G
denotes the specifications which apply over the full operating
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