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參數(shù)資料
| 型號： | LT1111M |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual 4-Input Positive-NAND Gates 14-SO 0 to 70 |
| 中文描述： | 微功率DC / DC轉(zhuǎn)換可調(diào)和固定5V，12V的 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 337K |
| 代理商： | LT1111M |
5
LT1111
C
HARA TERISTICS
U
A
TYPICAL PERFOR
CE
GND (Pin 5):
Ground.
A0 (Pin 6):
Auxiliary Gain Block (GB) Output. Open collector,
can sink 300
μ
A.
SET (Pin 7):
GB Input. GB is an op amp with positive input
connected to SET pin and negative input connected to
FB/SENSE (Pin 8):
On the LT1111 (adjustable) this pin
goes to the comparator input. On the LT1111-5 and
LT1111-12, this pin goes to the internal application resistor
that sets output voltage.
Maximum Switch Current
vs R
LIM
Quiescent Current
Quiescent Current
INPUT VOLTAGE (V)
Q
μ
A
0
LT1111 TPC10
3
400
380
360
340
320
280
260
6
240
220
200
300
9
12
15 18
21 24 27
30
TEMPERATURE (
°
C)
Q
μ
A
–50
LT1111 TPC11
500
450
400
350
250
–25
150
100
200
300
0
25
50
75
100
125
TEMPERATURE (
°
C)
B
–50
LT1111 TPC14
100
90
80
70
50
–25
30
20
40
60
0
25
50
75
100
125
10
0
I
LIM
(Pin 1):
Connect this pin to V
IN
for normal use. Where
lower current limit is desired, connect a resistor between
I
LIM
and V
IN
. A 220
resistor will limit the switch current
to approximately 400mA.
V
IN
(Pin 2):
Input Supply Voltage.
SW1 (Pin 3):
Collector of Power Transistor. For step-up
mode connect to inductor/diode. For step-down mode
connect to V
IN
.
SW2 (Pin 4):
Emitter of Power Transistor. For step-up
mode connect to ground. For step-down mode connect to
inductor/diode. This pin must never be allowed to go more
than a Schottky diode drop below ground.
PIU
FU
U
C
U
S
O
TI
TEMPERATURE (
°
C)
B
–50
LT1111 TPC13
100
90
80
70
50
–25
30
20
40
60
0
25
50
75
100
125
10
0
Set Pin Bias Current
Feedback Bias Current
R
LIM
(
)
S
10
LT1111 TPC12
100
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
1000
STEP-DOWN
V
IN
= 12V
STEP-UP
2V
≤
V
IN
≤
5V
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