Datasheet

4
LTC1147-3.3
LTC1147-5/LTC1147L
sn1147 1147fds
LOAD CURRENT (A)
0
–100
∆V
OUT
(mV)
–80
–60
–40
–20
0
20
0.5 1.0 1.5 2.0
LTC1147 • G03
2.5
FIGURE 1 CIRCUIT
R
SENSE
= 0.05Ω
V
IN
= 6V
V
IN
= 12V
INPUT VOLTAGE (V)
0
∆V
OUT
(mV)
0
10
20
16
LTC1147 • G02
–10
–20
–40
4
812
–30
40
30
FIGURE 1 CIRCUIT
I
LOAD
= 1A
Efficiency vs Input Voltage Line Regulation Load Regulation
INPUT VOLTAGE (V)
0
80
EFFICIENCY (%)
82
86
88
90
100
94
4
8
LTC1147 • G01
84
96
98
92
12
16
FIGURE 1 CIRCUIT
I
LOAD
= 1A
I
LOAD
= 100mA
OPERATING FREQUENCY (kHz)
20
0
GATE CHARGE CURRENT (mA)
2
4
6
14
10
80
140
12
8
200
260
Q
P
= 29nC
Q
P
= 50nC
LTC1147 • G07
TEMPERATURE (°C)
0
0
SENSE VOLTAGE (mV)
25
50
75
175
125
20
40
150
100
60
80
100
MAXIMUM
THRESHOLD
MINIMUM
THRESHOLD
LTC1147 • G09
OUTPUT VOLTAGE (V)
0
OFF-TIME (µs)
40
50
60
4
LTC1147 • G08
30
20
0
1
23
10
80
70
5
LTC1147-5
LTC1147-3.3
V
SENSE
–
= V
OUT
Gate Charge Supply Current
Operating Frequency
vs (V
IN
– V
OUT
)
INPUT VOLTAGE (V)
0
0
SUPPLY CURRENT (mA)
0.3
0.9
1.2
1.5
4
LTC1147 • G04
0.6
26
1.8
2.1
8 10 12 14 16 18
NOT INCLUDING
GATE CHARGE CURRENT
SLEEP MODE
ACTIVE MODE
(V
IN
– V
OUT
) VOLTAGE (V)
0
NORMALIZED FREQUENCY
0.6
1.0
8
LTC1148 • G06
0.4
0
2
4
6
0.2
1.2
0.8
10 12
1.4
1.6
V
OUT
= 5V
0°C
70°C
25°C
INPUT VOLTAGE (V)
0
0
SUPPLY CURRENT (µA)
2
6
8
10
20
14
4
8
10 18
LTC1147 • G05
4
16
18
12
26
12
14
16
V
SHUTDOWN
= 2V
(NOT AVAILABLE ON LTC1147L)
DC Supply Current Supply Current in Shutdown
Current Sense Threshold Voltage
Off-Time vs V
OUT
TYPICAL PERFOR A CE CHARACTERISTICS
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