3412EFE Просмотр технического описания (PDF) - Linear Technology
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3412EFE Datasheet PDF : 20 Pages
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LTC3412
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
fOSC
Switching Frequency
ROSC = 309kΩ
Switching Frequency Range
(Note 6)
0.88 0.95
1.1
0.3
4
fSYNC
RPFET
RNFET
ILIMIT
VUVLO
ILSW
VRUN
IRUN
SYNC Capture Range
RDS(ON) of P-Channel FET
RDS(ON) of N-Channel FET
Peak Current Limit
Undervoltage Lockout Threshold
SW Leakage Current
RUN Threshold
RUN/SS Leakage Current
(Note 6)
ISW = 1A (Note 7)
ISW = –1A (Note 7)
VRUN = 0V, VIN = 5.5V
0.3
4
2.375
0.5
85
65
5.4
2.500
0.1
0.65
4
110
90
2.625
1
0.8
1
UNITS
MHz
MHz
MHz
mΩ
mΩ
A
V
μA
V
μA
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 LTC3412E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3412I is guaranteed to meet
specified performance over the – 40°C to 85°C temperature range.
Note 3: The LTC3412 is tested in a feedback loop that adjusts VFB to
achieve a specified error amplifier output voltage (ITH).
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: TJ is calculated from the ambient temperature TA and power
dissipation as follows: LTC3412: TJ = TA + PD (37.6°C/W).
Note 6: 4MHz operation is guaranteed by design and not production tested.
Note 7: Switch on resistance is guaranteed by design and test correlation
in the UF package and by production test in the FE package.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
100
80
Burst Mode OPERATION
60
FORCED CONTINUOUS
40
20
0
0.001
VIN = 3.3V
VOUT = 2.5V
0.01
0.1
1
10
LOAD CURRENT (A)
3412 G01
Efficiency vs Load Current
100
90
80
VIN = 3.3V VIN = 5V
70
60
50
40
30
20 VOUT = 2.5V
10 1MHz
Burst Mode OPERATION
0
0.001
0.01
0.1
1
LOAD CURRENT (A)
10
3412 G02
Efficiency vs Load Current
100
90
80
VIN = 3.3V
70
VIN = 5V
60
50
40
30
20
10
0
0.001
VOUT = 2.5V
1MHz
FORCED CONTINUOUS
0.01
0.1
1
10
LOAD CURRENT (A)
3412 G03
3412fb
3
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