LTC1771 データシートの表示（PDF） - Linear Technology
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LTC1771 Datasheet PDF : 16 Pages
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LTC1771
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 10V, VRUN = open unless otherwise specified.
SYMBOL
VRUN/SS
IRUN
PGATE tr, tf
PARAMETER
RUN/SS Pin Threshold
Source Current
PGATE Transition Time (Note 7)
Rise Time
Fall Time
CONDITIONS
VRUN/SS Rising
VRUN = 0V, VIN = 2.8V to 18V
CLOAD = 2000pF
CLOAD = 2000pF
MIN TYP MAX
q 0.5
1.0
2
0.3
1
3
70
140
70
140
UNITS
V
µA
ns
ns
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formulas:
LTC1771S8: TJ = TA + (PD)(110°C/W)
LTC1771MS8: TJ = TA + (PD)(150°C/W)
Note 3: The LTC1771E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC1771I is guaranteed and tested
over the – 40°C to 85°C operating temperature range.
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: The LTC1771 is tested in a feedback loop that servos VFB to the
balance point for the error amplifier (VITH = 1.23V).
Note 6: No-load supply current consists of sleep mode current (9µA
typical) plus a small switching component necessary to overcome
Schottky diode leakage and feedback resistor current.
Note 7: tr and tf are measured at 10% to 90% levels.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage
100
FIGURE 1 CIRCUIT
90
ILOAD = 1A
ILOAD = 50mA
80
ILOAD = 1mA
70
60
2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
1771 G01
Efficiency vs Load Current
100
Burst Mode OPERATION
90
ENABLED
80
70
60
50
Burst Mode OPERATION
DISABLED
40
30
20
10
0
0.1
VIN = 10V
FIGURE 1 CIRCUIT
1
10
100 1000
LOAD CURRENT (mA)
1771 G02
Line Regulation
0.4
FIGURE 1 CIRCUIT
0.3
0.2
0.1
ILOAD = 100mA
0
– 0.1
ILOAD = 1A
– 0.2
– 0.3
– 0.4
0
5
10
15
INPUT VOLTAGE (V)
20
1771 G03
3
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