LTC1773EMS データシートの表示（PDF） - Linear Technology
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LTC1773EMS Datasheet PDF : 20 Pages
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LTC1773
ELECTRICAL CHARACTERISTICS
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 LTC1773 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: TJ is calculated from the ambient temperature TA and power dissipation
PD according to the following formula:
LTC1773: TJ = TA + (PD • 120°C/W)
Note 4: The LTC1773 is tested in a feedback loop which servos VFB to the
balance point for the error amplifier (VITH = 0.8V)
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: Rise and fall times are measured using 10% and 90% levels.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
VIN = 5V
100 VOUT = 2.5V
SEE FIGURE 1
90
80
Burst Mode
OPERATION
70
SYNC(750kHz)
60
FORCED CONTINUOUS
50
1
10
100
1000 5000
OUTPUT CURRENT (mA)
1773 G01
Load Regulation
0
– 0.05
RSENSE = 0.025Ω
SEE FIGURE 1
– 0.10
– 0.15
– 0.20
– 0.25
– 0.30
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
LOAD CURRENT (A)
1773 G16
Efficiency vs Load Current
100
VOUT = 2.5V
SEE FIGURE 1
VIN = 3.3V
90
VIN = 5V
80
VIN = 8V
70
60
50
1
10
100
1000 10,000
OUTPUT CURRENT (mA)
1773 G02
VIN-VOUT Dropout Voltage
vs Load Current
400
RSENSE = 0.025Ω
350 VOUT = 1.8V
Si9801DY
300
250
200
150
100
50
0
0
500 1000 1500 2000 2500
LOAD CURRENT (mA)
1773 G05
Efficiency vs Input Voltage
100
VOUT = 2.5V
SEE FIGURE 1
95
IOUT = 1A
90
85
IOUT = 100mA
80
75
2
4
6
8
INPUT VOLTAGE (V)
10
1773 G03
Input and Shutdown Currents
vs Input Voltage
500
450
400
SYNC TO 750kHz
350 VOUT = 1.8V
300
Si9801DY
RSENSE = 0.025Ω
250 L = CDRH6D28-3RO
200
150
Burst Mode OPERATION
100
50
SHUTDOWN
0
2
4
6
8
10
INPUT VOLTAGE (V)
1773 G06
1773fb
3
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