LTC1142(RevC) 데이터 시트보기 (PDF) - Linear Technology
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LTC1142 Datasheet PDF : 20 Pages
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LTC1142/LTC1142L/LTC1142HV
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating
temperature range.
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
LTC1142CG: TJ = TA + (PD × 95°C/ W)
Note 2: This current is for one regulator block. Total supply current is the
sum of Pins 10 and 24 currents. Dynamic supply current is higher due to
the gate charge being delivered at the switching frequency. See the
Applications Information section.
Note 3: In applications where RSENSE is placed at ground potential, the off-
time increases approximately 40%.
Note 4: The LTC1142/LTC1142HV-ADJ/LTC1142HV/LTC1142L-ADJ are
not tested and quality-assurance sampled at – 40°C to 85°C. These
specifications are guaranteed by design and/or correlation.
Note 5: The LTC1142L-ADJ allows operation down to VIN = 3.5V.
TYPICAL PERFOR A CE CHARACTERISTICS
5V Output Efficiency
100
VIN = 6V
95
VIN = 10V
90
3.3V Output Efficiency
100
VIN = 5V
95
VIN = 10V
90
85
0.01
0.1
LOAD CURRENT (A)
12
1142 G01
85
0.01
0.1
LOAD CURRENT (A)
12
1142 G02
5V Efficiency vs Input Voltage
100
98
FIGURE 1 CIRCUIT
VOUT = 5V
96
ILOAD = 1A
94
92
90
ILOAD = 100mA
88
86
84
82
80
0
4
8
12
16
20
INPUT VOLTAGE (V)
1142 G03
3.3V Efficiency vs Input Voltage
100
98
FIGURE 1 CIRCUIT
VOUT = 3.3V
96
94
ILOAD = 1A
92
90
ILOAD = 100mA
88
86
84
82
80
0
4
8
12
16
20
INPUT VOLTAGE (V)
1142 G04
Line Regulation
40
FIGURE 1 CIRCUIT
30 ILOAD = 1A
20
10
0
– 10
– 20
– 30
– 40
0
4
8
12
16
20
INPUT VOLTAGE (V)
1142 G05
Load Regulation
20
0
FIGURE 1 CIRCUIT
RSENSE = 0.05Ω
–20
VIN = 6V
VIN = 12V
– 40
– 60
– 80
– 100
0
VIN = 6V
VOUT = 5V
VOUT = 3.3V
VIN = 12V
0.5 1.0 1.5 2.0 2.5
LOAD CURRENT (A)
1142 G06
4
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