LTC1148HV Linear Technology, LTC1148HV Datasheet - Page 4

• Manufacturer Part Number: LTC1148HV
• Description: High Efficiency Synchronous Step-Down Switching Regulators
• Manufacturer: Linear Technology

LTC1148
LTC1148-3.3/LTC1148-5
The
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T
dissipation P
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
TYPICAL PERFOR
4
ELECTRICAL C
100
2.1
1.8
1.5
1.2
0.9
0.6
0.3
LTC1148CN, LTC1148CN-3.3, LTC1148CN-5: T
LTC1148CS, LTC1148CS-3.3, LTC1148CS-5: T
92
80
98
96
94
90
88
86
84
82
0
0
denotes specifications which apply over the full operating
Efficiency vs Input Voltage
0
DC Supply Current
NOT INCLUDING
GATE CHARGE CURRENT
J
2
is calculated from the ambient temperature T
D
4
4
according to the following formulas:
INPUT VOLTAGE (V)
6
I
INPUT VOLTAGE
LOAD
ACTIVE MODE
SLEEP MODE
8
8
= 100mA
10 12 14 16 18
HARA TERISTICS
12
FIGURE 1 CIRCUIT
I
LOAD
LTC1148 • TPC04
LTC1148 • TPC01
W
= 1A
16
A
C
U
20
20
CE
J
J
= T
= T
C
A
A
A
HARA TERISTICS
+ (P
+ (P
and power
–20
–30
–40
–10
20
18
16
14
12
10
40
30
20
10
8
6
4
2
0
0
D
0
Supply Current in Shutdown
0
D
Line Regulation
V
FIGURE 1 CIRCUIT
I
LOAD
SHUTDOWN
2
110 C/W)
70 C/W)
= 1A
C
4
4
6
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
= 2V
8
8
10
Note 4: The LTC1148 and LTC1148HV versions are tested with external
feedback resistors resulting in a nominal output voltage of 5V. The
LTC1148L version is tested with external feedback resistors resulting in a
nominal output voltage of 2.5V.
Note 5: In applications where R
time increases approximately 40%.
Note 6: The LTC1148, LTC1148HV and LTC1148L series are not tested
and not quality assurance sampled at –40 C and 85 C. These
specifications are guaranteed by design and/or correlation.
Note 7: The LTC1148L and LTC1148L-3.3 allow operation to V
12 14 16
12
LTC1148 • TPC05
LTC1148 • TPC02
16
18
20
20
–100
–20
–40
–60
–80
20
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
SENSE
0
0
0
Load Regulation
Operating Frequency
vs (V
0
V
OUT
is placed at ground potential, the off
IN
= 5V
2
0.5
– V
(V
V
IN
V
LOAD CURRENT (A)
IN
OUT
IN
4
– V
= 12V
= 6V
1
OUT
)
) VOLTAGE (V)
6
FIGURE 1 CIRCUIT
R
1.5
25°C
SENSE
0°C
70°C
8
IN
= 0.05
LTC1148 • TPC06
2
LTC1148 • TPC03
= 3.5V.
10
2.5
12