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LTC1629C Datasheet(PDF) 7 Page - Linear Technology

Part # LTC1629C
Description  PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulators
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1629C Datasheet(HTML) 7 Page - Linear Technology

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LTC1629/LTC1629-PG
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.
PI FU CTIO S
Current Sense Pin Input Current
vs Temperature
EXTVCC Switch Resistance
vs Temperature
Oscillator Frequency
vs Temperature
Undervoltage Lockout
vs Temperature
Shutdown Latch Thresholds
vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
TEMPERATURE (
°C)
–50
–25
0
0.5
1.5
2.0
2.5
75
100
50
4.5
1629 G27
1.0
0
25
125
3.0
3.5
4.0
LATCH ARMING
LATCHOFF
THRESHOLD
TEMPERATURE (
°C)
–50
3.40
3.45
3.50
25
75
1629 G26
3.35
3.30
–25
0
50
100
125
3.25
3.20
TEMPERATURE (
°C)
–50
200
250
350
25
75
1629 G25
150
100
–25
0
50
100
125
50
0
300
VFREQSET = 5V
VFREQSET = OPEN
VFREQSET = 0V
TEMPERATURE (
°C)
–50
–25
0
4
10
0
50
75
1629 G24
2
8
6
25
100
125
LTC1629
LTC1629-PG
TEMPERATURE (
°C)
–50
–25
25
29
35
0
50
75
1629 G23
27
33
31
25
100
125
VOUT = 5V



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