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LTC1142_00 Datasheet(数据表) 4 Page - Linear Technology

部件型号  LTC1142
说明  Dual High Efficiency Synchronous Step-Down Switching Regulators
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
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LTC1142 Datasheet(HTML) 4 Page - Linear Technology

 
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4
LTC1142/LTC1142L/LTC1142HV
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1142, LTC1142HV
V14 = VOUT + 100mV (Forced)
25
mV
V14 = VOUT – 100mV (Forced)
125
150
175
mV
VSHDN
Shutdown Pin Threshold
0.55
0.8
2
V
tOFF
Off-Time (Note 4)
CT = 390pF, ILOAD = 700mA
3.8
5
6
µs
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 formula:
LTC1142CG: TJ = TA + (PD × 95°C/ W)
Note 3: 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 4: In applications where RSENSE is placed at ground potential, the off-
time increases approximately 40%.
Note 5: The LTC1142/LTC1142L/LTC1142HV are guaranteed to meet
specified performance from 0
°C to 70°C and are designed, characterized
and expected to meet these extended temperature limits, but are not tested
at – 40
°C and 85°C. Guaranteed I-grade parts are available, consult the
factory.
Note 6: The LTC1142L-ADJ allows operation down to VIN = 3.5V.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
5V Output Efficiency
3.3V Output Efficiency
5V Efficiency vs Input Voltage
3.3V Efficiency vs Input Voltage
Load Regulation
Line Regulation
LOAD CURRENT (A)
0.01
100
95
90
85
0.1
1
1142 G01
2
VIN = 6V
VIN = 10V
LOAD CURRENT (A)
0.01
100
95
90
85
0.1
1
1142 G02
2
VIN = 5V
VIN = 10V
INPUT VOLTAGE (V)
0
100
98
96
94
92
90
88
86
84
82
80
16
1142 G03
4
8
12
20
FIGURE 1 CIRCUIT
VOUT = 5V
ILOAD = 1A
ILOAD = 100mA
INPUT VOLTAGE (V)
0
100
98
96
94
92
90
88
86
84
82
80
16
1142 G04
4
8
12
20
FIGURE 1 CIRCUIT
VOUT = 3.3V
ILOAD = 1A
ILOAD = 100mA
INPUT VOLTAGE (V)
0
40
30
20
10
0
–10
–20
–30
–40
16
1142 G05
4
8
12
20
FIGURE 1 CIRCUIT
ILOAD = 1A
LOAD CURRENT (A)
0
20
0
–20
–40
–60
–80
– 100
2.0
1142 G06
0.5
1.0
1.5
2.5
FIGURE 1 CIRCUIT
RSENSE = 0.05Ω
VIN = 6V
VIN = 6V
VIN = 12V
VOUT = 5V
VOUT = 3.3V
VIN = 12V
–40
°C ≤ TA ≤ 85°C (Note 5), V10 = V24 = 10V, unless otherwise noted.




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