LTC3718EG View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC3718EG' PDF : 20 Pages View PDF
LTC3718
ELECTRICAL CHARACTERISTICS
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 as follows:
LTC3718EG: TJ = TA + (PD • 130°C/W)
Note 3: The LTC3718 is tested in a feedback loop that adjusts VFB1 to
achieve a specified error amplifier output voltage (ITH).
Note 4: The LTC3718 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.
Note 5: Current limit guaranteed by design and/or correlation to static test.
TYPICAL PERFOR A CE CHARACTERISTICS
Boost Converter Oscillator
Frequency vs Temperature
2.00
1.75
VIN = 5V
1.50
1.25
VIN = 1.5V
1.00
0.75
0.50
0.25
0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
3718 G01
SHDN Pin Current vs VSHDN
50
TA = 25°C
40
30
20
10
0
0
1
2
3
4
5
SHDN PIN VOLTAGE (V)
3718 G02
VFB2, Feedback Pin Voltage
1.25
1.24
1.23
1.22
1.21
FIGURE 1 CIRCUIT
1.20
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
3718 G04
Efficiency vs Load Current
100
90
VIN = 2.5V
VOUT = 1.25V
80
70
60
50
40
30
20
10
0
0.01
FIGURE 1 CIRCUIT
0.1
1
10
100
LOAD CURRENT (A)
3718 G05/TA01a
Boost Converter Current Limit
vs Duty Cycle
1000
900
800
70°C
700
600
25°C
500
400
–40°C
300
200
10 20 30 40 50 60 70 80
DUTY CYCLE (%)
3718 G03
VOUT/VIN Tracking Ratio vs Input
Voltage
50.00
49.95 LOAD = 0A
49.90
49.85
49.80
LOAD = 1A
LOAD = 10A
49.75
49.70
FIGURE 1 CIRCUIT
49.65
1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9
INPUT VOLTAGE (V)
3718 G06
3718fa
4
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