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LTC1148L Datasheet

  • LTC1148L

  • Linear Technology [High Efficiency Synchronous Step-Down Sw...

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LTC1148
LTC1148-3.3/LTC1148-5
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formulas:
LTC1148CN, LTC1148CN-3.3, LTC1148CN-5: T
J
= T
A
+ (P
D
脳
70擄C/W)
LTC1148CS, LTC1148CS-3.3, LTC1148CS-5: T
J
= T
A
+ (P
D
脳
110擄C/W)
Note 3:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
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
SENSE
is placed at ground potential, the off
time increases approximately 40%.
Note 6:
The LTC1148, LTC1148HV and LTC1148L series are not tested
and not quality assurance sampled at 鈥?0擄C and 85擄C. These
specifications are guaranteed by design and/or correlation.
Note 7:
The LTC1148L and LTC1148L-3.3 allow operation to V
IN
= 3.5V.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage
100
98
96
EFFICIENCY (%)
FIGURE 1 CIRCUIT
94
92
90
88
86
84
82
80
0
4
I
LOAD
= 1A
鈭哣
OUT
(mV)
鈭哣
OUT
(mV)
I
LOAD
= 100mA
12
8
INPUT VOLTAGE (V)
LTC1148 鈥?TPC01
DC Supply Current
2.1
1.8
NOT INCLUDING
GATE CHARGE CURRENT
SUPPLY CURRENT (碌A(chǔ))
NORMALIZED FREQUENCY
SUPPLY CURRENT (mA)
1.5
1.2
0.9
0.6
0.3
0
0
2
4
6
ACTIVE MODE
SLEEP MODE
8 10 12 14 16 18 20
INPUT VOLTAGE
LTC1148 鈥?TPC04
4
U W
16
20
Line Regulation
40
30
20
10
0
鈥?0
鈥?0
鈥?0
鈥?0
0
4
8
12
16
20
INPUT VOLTAGE (V)
LTC1148 鈥?TPC02
Load Regulation
20
FIGURE 1 CIRCUIT
R
SENSE
= 0.05鈩?/div>
FIGURE 1 CIRCUIT
I
LOAD
= 1A
0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?00
0
0.5
V
IN
= 12V
V
IN
= 6V
1
1.5
LOAD CURRENT (A)
2
2.5
LTC1148 鈥?TPC03
Supply Current in Shutdown
20
18
16
14
12
10
8
6
4
2
0
0
2
4
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
LTC1148 鈥?TPC05
Operating Frequency
vs (V
IN
鈥?V
OUT
)
1.6
V
OUT
= 5V
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
2
8
10
6
(V
IN
鈥?V
OUT
) VOLTAGE (V)
4
12
70擄C
25擄C
0擄C
V
SHUTDOWN
= 2V
LTC1148 鈥?TPC06

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