LTC1629I データシートの表示（PDF） - Linear Technology
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LTC1629I Datasheet PDF : 28 Pages
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LTC1629/LTC1629-PG
TYPICAL PERFOR A CE CHARACTERISTICS
Current Sense Pin Input Current
vs Temperature
35
VOUT = 5V
33
31
29
27
25
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1629 G23
EXTVCC Switch Resistance
vs Temperature
10
8
LTC1629
6
4
LTC1629-PG
2
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1629 G24
Oscillator Frequency
vs Temperature
350
VFREQSET = 5V
300
250
VFREQSET = OPEN
200
150
VFREQSET = 0V
100
50
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
1629 G25
Undervoltage Lockout
vs Temperature
3.50
3.45
3.40
3.35
3.30
3.25
3.20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1629 G26
Shutdown Latch Thresholds
vs Temperature
4.5
4.0
LATCH ARMING
3.5
3.0
LATCHOFF
THRESHOLD
2.5
2.0
1.5
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1629 G27
PI FU CTIO S
RUN/SS (Pin 1): Combination of Soft-Start, Run Control
Input and Short-Circuit Detection Timer. A capacitor to
ground at this pin sets the ramp time to full current output.
Forcing this pin below 0.8V causes the IC to shut down all
internal circuitry. All functions are disabled in shutdown.
SENSE1+, SENSE2+ (Pins 2,14): The (+) Input to the
Differential Current Comparators. The ITH pin voltage and
built-in offsets between SENSE– and SENSE+ pins in
conjunction with RSENSE set the current trip threshold.
SENSE1–, SENSE2– (Pins 3, 13): The (–) Input to the
Differential Current Comparators.
EAIN (Pin 4): Input to the Error Amplifier that compares
the feedback voltage to the internal 0.8V reference voltage.
This pin is normally connected to a resistive divider from
the output of the differential amplifier (DIFFOUT).
PLLFLTR (Pin 5): The Phase-Locked Loop’s Low Pass
Filter is tied to this pin. Alternatively, this pin can be driven
with an AC or DC voltage source to vary the frequency of
the internal oscillator.
7
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