LTC1980 Ver la hoja de datos (PDF) - Linear Technology
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LTC1980 Datasheet PDF : 16 Pages
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LTC1980
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.VBAT = 2.4V, VREG = 5V, VBAT unloaded.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
VP2
Digital Input Pull-Up Voltage, BATT1
VIL3
Digital Input Low Voltage, BATT2
VIH3
Digital Input High Voltage, BATT2
II1
Digital Input Current, WA
II2
Digital Input Current, BATT1
II3
Digital Input Current, BATT2
BATT1 Input Floating
1.6
V
0.3
V
2
V
–5
5
µA
–10
10
µA
–1
1
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1980E 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 3: TA = 0°C to 70°C.
TYPICAL PERFOR A CE CHARACTERISTICS
Feedback Reference Voltage
vs Temperature
1.2240
1.2235
1.2230
1.2225
1.2220
1.2215
1.2210
1.2205
–40
–15 10
35
60
85
TEMPERATURE (°C)
1980 G01
3.3V Regulator Efficiency
vs Load Current
90
85
80
75
70
65
60
10
VBAT = 3.6V
TA = 25°C
FIGURE 5
100
LOAD CURRENT (mA)
1000
1980 G04
4
Switching Frequency Variance
vs Temperature
1.5
1.0
0.5
Regulator Load Regulation
0
VBAT = 4.2V
VREG ≅ 3.3V
–0.2
TA = 25°C
FIGURE 5
–0.4
0
–0.6
–0.5
–0.8
–1.0
–1.0
–1.5
–40
–15 10
35
60
85
TEMPERATURE (°C)
1980 G02
5V Regulator Efficiency
vs Load Current
90
–1.2
0
100 200 300 400 500
LOAD CURRENT (mA)
1980 G03
Regulator Load Step Response
85
VREG
50mV/DIV
80
75
70
65
60
10
IL
500mA/DIV
VBAT = 3.6V
TA = 25°C
R8 = 309k
FIGURE 5
100
LOAD CURRENT (mA)
1000
1980 G05
VBAT = 3.6V
100µs/DIV
VREG ≅ 3.3V
IL = 100mA TO 500mA
TA = 25°C
FIGURE 5
1980 G06
1980f
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