LTC1709EG-85 查看數據表（PDF） - Linear Technology
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LTC1709EG-85
Linear Technology
LTC1709EG-85 Datasheet PDF : 28 Pages
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LTC1709-85
TYPICAL PERFOR A CE CHARACTERISTICS
Current Sense Pin Input Current
vs Temperature
–13
VOUT = 1.6V
–12
–11
–10
–9
EXTVCC Switch Resistance
vs Temperature
10
8
6
4
2
Oscillator Frequency
vs Temperature
350
VPLLFLTR = 2.4V
300
250
200
150
VPLLFLTR = 0V
100
50
–8
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
170985 G20
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
170985 G21
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
170985 G22
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
170985 G23
VRUN/SS 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
170985 G24
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 Each
Differential Current Comparator. 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).
170985f
7
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