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参数资料
| 型号： | LT1871IMS-7#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 29/32页 |
| 文件大小： | 461K |
| 代理商： | LT1871IMS-7#TR |
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LTC1871-7
6
18717fc
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency vs Temperature
Maximum Sense Threshold
vs Temperature
SENSE Pin Current vs Temperature
INTVCC Load Regulation
INTVCC Line Regulation
INTVCC Dropout Voltage
vs Current, Temperature
RUN (Pin 1): The RUN pin provides the user with an
accurate means for sensing the input voltage and pro-
gramming the start-up threshold for the converter. The
falling RUN pin threshold is nominally 1.248V and the
comparator has 100mV of hysteresis for noise immunity.
When the RUN pin is below this input threshold, the IC
is shut down and the VIN supply current is kept to a low
value (typ 10μA). The Absolute Maximum Rating for the
voltage on this pin is 7V.
ITH (Pin 2): Error Amplier Compensation Pin. The
current comparator input threshold increases with this
control voltage. Nominal voltage range for this pin is 0V
to 1.40V.
FB (Pin 3): Receives the feedback voltage from the external
resistor divider across the output. Nominal voltage for
this pin in regulaton is 1.230V.
FREQ (Pin 4): A resistor from the FREQ pin to ground
programs the operating frequency of the chip. The nominal
voltage at the FREQ pin is 0.6V.
PIN FUNCTIONS
TEMPERATURE (°C)
–50
275
GATE
FREQUENCY
(kHz)
280
290
295
300
325
310
0
50
75
18717 G13
285
315
320
305
–25
25
100 125
150
TEMPERATURE (°C)
–50
140
MAX
SENSE
THRESHOLD
(mV)
145
150
155
160
–25
0
25
50
18717 G14
75
100 125 150
TEMPERATURE (°C)
–50
25
SENSE
PIN
CURRENT
(μA)
30
35
0
50
75
18717 G15
–25
25
100 125
150
GATE HIGH
VSENSE = 0V
INTVCC LOAD (mA)
0
INTV
CC
VOLTAGE
(V)
7.0
30
50
80
18717 G16
6.9
6.8
10
20
40
60
70
VIN = 8V
VIN (V)
0
6.9
INTV
CC
VOLTAGE
(V)
7.0
7.1
10
20
30
40
18717 G17
7.2
515
25
35
INTVCC LOAD (mA)
0
DROPOUT
VOLTAGE
(mV)
50
150
200
250
500
350
5
10
18717 G18
100
400
450
300
15
20
150°C
75°C
125°C
25°C
–50°C
0°C
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