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LTC1771 датащи(PDF) 3 Page - Linear Technology

номер детали LTC1771
подробное описание детали  10mA Quiescent Current High Efficiency Step-Down DC/DC Controller
PDF  16 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LTC1771 датащи(HTML) 3 Page - Linear Technology

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LTC1771
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.
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
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VRUN/SS
RUN/SS Pin Threshold
VRUN/SS Rising
q
0.5
1.0
2
V
IRUN
Source Current
VRUN = 0V, VIN = 2.8V to 18V
0.3
1
3
µA
PGATE tr, tf
PGATE Transition Time (Note 7)
Rise Time
CLOAD = 2000pF
70
140
ns
Fall Time
CLOAD = 2000pF
70
140
ns
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 (9
µA
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.
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage
INPUT VOLTAGE (V)
2
60
70
80
90
100
468
10
1771 G01
12
14
16
18
20
ILOAD = 50mA
ILOAD = 1mA
FIGURE 1 CIRCUIT
ILOAD = 1A
LOAD CURRENT (mA)
0.1
40
50
60
70
80
1
10
1000
100
1771 G02
30
20
10
0
90
100
Burst Mode OPERATION
ENABLED
Burst Mode OPERATION
DISABLED
VIN = 10V
FIGURE 1 CIRCUIT
INPUT VOLTAGE (V)
0
0
0.1
0.2
20
1771 G03
– 0.1
– 0.2
– 0.4
5
10
15
– 0.3
0.4
0.3
ILOAD = 100mA
ILOAD = 1A
FIGURE 1 CIRCUIT
Efficiency vs Load Current
Line Regulation



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