LTC1142-ADJ Linear Technology, LTC1142-ADJ Datasheet - Page 4

• Manufacturer Part Number: LTC1142-ADJ
• Description: Dual High Efficiency Synchronous Step-Down Switching Regulators
• Manufacturer: Linear Technology

LTC1142/LTC1142L/LTC1142HV
4
TYPICAL PERFOR
ELECTRICAL C
The
temperature range.
Note 1: T
dissipation P
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
100
100
95
90
85
98
96
94
92
90
88
86
84
82
80
0.01
denotes specifications which apply over the full operating
0
5V Output Efficiency
3.3V Efficiency vs Input Voltage
J
LTC1142CG: T
is calculated from the ambient temperature T
D
I
LOAD
4
according to the following formula:
LOAD CURRENT (A)
= 100mA
INPUT VOLTAGE (V)
V
V
IN
IN
0.1
8
= 10V
= 6V
J
= T
FIGURE 1 CIRCUIT
V
HARA TERISTICS
OUT
I
12
LOAD
A
+ (P
= 3.3V
= 1A
D
W
16
1
95 C/ W)
1142 G01
A
C
1142 G04
U
20
2
CE
C
A
– 10
– 20
– 30
– 40
HARA TERISTICS
100
and power
95
90
85
40
30
20
10
0
0.01
0
3.3V Output Efficiency
Line Regulation
FIGURE 1 CIRCUIT
I
LOAD
4
= 1A
C
LOAD CURRENT (A)
INPUT VOLTAGE (V)
V
V
IN
IN
8
0.1
= 10V
= 5V
the gate charge being delivered at the switching frequency. See the
Applications Information section.
Note 3: In applications where R
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 V
12
16
1
1142 G02
1142 G05
20
2
– 100
100
– 40
– 60
– 80
–20
98
96
94
92
90
88
86
84
82
80
20
SENSE
0
0
5V Efficiency vs Input Voltage
Load Regulation
0
is placed at ground potential, the off-
0.5
4
V
V
I
OUT
OUT
LOAD
V
INPUT VOLTAGE (V)
IN
LOAD CURRENT (A)
V
= 5V
= 3.3V
= 6V
IN
1.0
= 100mA
8
= 6V
IN
FIGURE 1 CIRCUIT
V
FIGURE 1 CIRCUIT
R
OUT
12
SENSE
1.5
= 3.5V.
I
= 5V
LOAD
V
IN
= 0.05
V
IN
= 12V
16
2.0
= 1A
= 12V
1142 G03
1142 G06
20
2.5