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LTC3872 Scheda tecnica(PDF) 3 Page - Linear Technology

Il numero della parte LTC3872
Spiegazioni elettronici  No RSENSE Current Mode Boost DC/DC Controller
PDF  20 Pages
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LTC3872 Scheda tecnica(HTML) 3 Page - Linear Technology

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LTC3872
3
3872fa
TEMPERATURE (˚C)
–60
1.22
1.23
1.24
60
40
3872 G01
1.21
1.20
–20
–40
20
0
100
80
1.19
1.18
1.25
VIN (V)
0
1.1990
1.1995
1.2005
1.2010
1.2015
1.2025
1
5
7
3872 G02
1.2000
1.2020
4
9
10
2
3
68
RUN VOLTAGE (V)
0
1.5
2.0
2.5
4.0
3872 G03
1.0
0.5
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
4.5 5.0
VIN = 2.5V
VIN = 3.3V
VIN = 5V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3872E is guaranteed to meet performance specifications
from 0°C to 85°C junction temperature. Specifications over the –40°C
to 85°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator Frequency
Normal Operation
VFB = 1.2V
500
550
650
kHz
Gate Drive Rise Time
CLOAD = 3000pF
40
ns
Gate Drive Fall Time
CLOAD = 3000pF
40
ns
Peak Current Sense Voltage
IPRG = GND (Note 6)
IPRG = Float
IPRG = VIN
●
●
●
80
145
240
100
170
270
120
195
290
mV
mV
mV
Default Internal Soft-Start Time
1ms
The
● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 4.2V unless otherwise noted. (Note 2)
ELECTRICAL CHARACTERISTICS
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • 110°C/W)
Note 4: The dynamic input supply current is higher due to power MOSFET
gate charging (QG • fOSC). See Applications Information.
Note 5: The LTC3872 is tested in a feedback loop which servos VFB to
the reference voltage with the ITH pin forced to the midpoint of its voltage
range (0.7V ≤ VITH ≤ 1.9V, midpoint = 1.3V).
Note 6: Rise and fall times are measured at 10% and 90% levels.
TYPICAL PERFOR A CE CHARACTERISTICS
FB Voltage vs Temperature
FB Voltage Line Regulation
ITH Voltage vs RUN/SS Voltage
TA = 25°C unless otherwise noted.



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