LTC1147L_15 Datasheet, PDF (4/16 Pages) Linear Technology – High Efficiency Step-Down Switching Regulator Controllers

LTC1147-3.3
LTC1147-5/LTC1147L
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage
100
FIGURE 1 CIRCUIT
98
96
94
I_LOAD = 1A
92
90
88
I_LOAD = 100mA
86
84
82
80
0
4
8
12
16
INPUT VOLTAGE (V)
LTC1147 • G01
Line Regulation
40
FIGURE 1 CIRCUIT
30 ^ILOAD ^{= 1A}
20
10
0
–10
– 20
– 30
– 40
0
4
8
12
INPUT VOLTAGE (V)
16
LTC1147 • G02
Load Regulation
20
0
FIGURE 1 CIRCUIT
R_SENSE = 0.05Ω
– 20
V_IN = 6V
– 40
– 60
V_IN = 12V
– 80
– 100
0
0.5 1.0 1.5 2.0 2.5
LOAD CURRENT (A)
LTC1147 • G03
DC Supply Current
2.1
NOT INCLUDING
GATE CHARGE CURRENT
1.8
1.5
ACTIVE MODE
1.2
0.9
0.6
0.3
SLEEP MODE
0
0 2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
LTC1147 • G04
Supply Current in Shutdown
20
18
V_SHUTDOWN = 2V
(NOT AVAILABLE ON LTC1147L)
16
14
12
10
8
6
4
2
0
0 2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
LTC1147 • G05
Operating Frequency
vs (V_IN – V_OUT)
1.6
V_OUT = 5V
1.4
0°C
1.2
70°C
1.0
25°C
0.8
0.6
0.4
0.2
0
0
2
4
6
8 10 12
(V_IN – V_OUT) VOLTAGE (V)
LTC1148 • G06
Gate Charge Supply Current
14
12
10
8
Q_P = 50nC
6
4
Q_P = 29nC
2
0
20
80
140
200
260
OPERATING FREQUENCY (kHz)
LTC1147 • G07
4
Off-Time vs V_OUT
80
70
V_SENSE– = V_OUT
60
50
40
30
20
10
LTC1147-5
LTC1147-3.3
0
0
1
2
3
4
5
OUTPUT VOLTAGE (V)
LTC1147 • G08
Current Sense Threshold Voltage
175
MAXIMUM
150
THRESHOLD
125
100
75
50
MINIMUM
25
THRESHOLD
0
0
20
40
60
80 100
TEMPERATURE (°C)
LTC1147 • G09
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