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參數(shù)資料
| 型號： | LT1512I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Octal Bus Transceivers 20-PDIP 0 to 70 |
| 中文描述： | SEPIC拓?fù)涞暮懔?恒壓電池充電器 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 261K |
| 代理商： | LT1512I |
3
LT1512
SYMBOL
V
SAT
I
LIM
PARAMETER
Output Switch ON Resistance
Switch Current Limit
CONDITIONS
I
SW
= 2A
Duty Cycle = 50%
Duty Cycle = 80% (Note 1)
MIN
TYP
0.5
1.9
1.7
15
MAX
0.8
2.7
2.5
25
UNITS
G
A
A
G
1.5
1.3
G
I
IN
I
SW
Supply Current Increase During Switch ON Time
mA/A
Control Voltage to Switch Current
Transconductance
Minimum Input Voltage
Supply Current
Shutdown Supply Current
2
A/V
G
2.4
4
2.7
5.5
V
I
Q
2.7V
≤
V
IN
≤
25V
2.7V
≤
V
IN
≤
25V, V
S/S
≤
0.6V
0
°
C
≤
T
J
≤
125
°
C
–40
°
C
≤
T
J
≤
0
°
C (LT1512I)
2.7V
≤
V
IN
≤
25V
G
mA
G
12
30
50
2
25
15
800
μ
A
μ
A
V
μ
s
μ
A
kHz
Shutdown Threshold
Shutdown Delay
S/S Pin Input Current
Synchronization Frequency Range
G
0.6
5
–10
600
1.3
12
G
0V
≤
V
S/S
≤
5V
G
G
ELECTRICAL C
V
IN
= 5V, V
C
= 0.6V, V
FB
= V
REF
, I
FB
= 0V, V
SW
and S/S pins open, unless otherwise noted.
HARA TERISTICS
The
G
denotes specifications which apply over the full operating
temperature range.
Note 1:
For duty cycles (DC) between 50% and 85%, minimum
guaranteed switch current is given by I
LIM
= 0.667 (2.75 – DC).
Note 2:
The I
FB
pin is servoed to its regulating state with V
C
= 0.8V.
Note 3:
Commercial devices are guaranteed over 0
°
C to 125
°
C junction
temperature range and 0
°
C to 70
°
C ambient temperature range. These
parts are also designed, characterized and expected to operate over the
–20
°
C to 85
°
C extended ambient temperature range, but are not tested at
–20
°
C or 85
°
C. Devices with full guaranteed electrical specifications over
the ambient temperature range –40
°
C to 85
°
C are available as industrial
parts with an “I” suffix.
Maximum allowable ambient temperature may be limited by power
dissipation. Parts may not necessarily be operated simultaneously at
maximum power dissipation and maximum ambient temperature.
Temperature rise calculations must be done as shown in the Applications
Information section to ensure that maximum junction temperature does
not exceed 125
°
C limit. With high power dissipation, maximum ambient
temperature may be less than 70
°
C.
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
Switch Saturation Voltage
vs Switch Current
Minimum Input Voltage
vs Temperature
Switch Current Limit
vs Duty Cycle
SWITCH CURRENT (A)
0
S
0.6
0.8
1.0
1.6
1512 G01
0.4
0.2
0.5
0.7
0.9
0.3
0.1
0
0.4
0.8
1.2
2.0
1.4
0.2
0.6
1.0
1.8
100
°
C
150
°
C
25
°
C
–55
°
C
DUTY CYCLE (%)
S
3.0
2.5
2.0
1.5
1.0
0.5
0
20
40
60
80
1512 G02
100
10
0
30
50
70
90
25
°
C AND
125
°
C
–55
°
C
TEMPERATURE (
°
C)
–50
1.8
I
2.0
2.2
2.4
2.6
0
50
100
150
1512 G03
2.8
3.0
–25
25
75
125
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