LTC1174
LTC1174-3.3/LTC1174-5
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Leakage Current
vs Temperature
Line Regulation
Efficiency vs Input Voltage
6
4
180
160
140
120
100
80
95
V
= 13.5V
I
I
= 100mA
= 0V
IN
LOAD
PGM
94
93
2
0
L = 100µH
92
–2
–4
–6
–8
–10
–12
–14
L = 50µH
91
90
60
V
I
I
= 5V
89
88
87
OUT
PGM
LOAD
40
= 0V
= 75mA
20
CORE = CTX (Kool Mµ®)
0
0
4
6
8
10
12
14
0
20
40
60
100
2
80
9
5
7
10 11 12 13 14
6
8
INPUT VOLTAGE (V)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
1174 G07
1174 G08
1174 G09
DC Supply Current
Supply Current in Shutdown
Efficiency vs Input Voltage
500
450
400
350
300
250
200
150
100
50
95
94
93
92
91
90
89
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
I
= 0V
PGM
ACTIVE MODE
V
= 5V
OUT
L = 100µH
COIL = CTX100-4
SHUTDOWN = 0V
T
= 25°C
A
I
= V
IN
PGM
CURRENT INTO PIN 6 ONLY
I = 100mA
LOAD
I = 0V
PGM
I
= 300mA
LOAD
I
= V
PGM
IN
SLEEP MODE
T
= 25°C
A
0
0
4
6
8
10
12
14
2
5
6
7
8
9
10 11 12 13 14
0
4
6
8
10
12
14
2
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1174 G12
1174 G10
1174 G11
Operating Frequency
vs V – V
Switch Resistance vs
Input Voltage
Off-Time vs Output Voltage
IN
OUT
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
50
40
30
20
10
0
2.0
1.5
1.0
0.5
0
T = 25°C
A
V
= 5V
OUT
T
= 25°C
A
T
A
= 70°C
LTC1174HV
LTC1174
LTC1174-5
LTC1174HV-5
LTC1174-3.3
LTC1174HV-3.3
5
7
0
2
3
6
8
9
4
6
10 12
14 16 18 20
INPUT VOLTAGE (V)
0
1
3
4
5
1
4
8
2
(V – V ) VOLTAGE (V)
OUTPUT VOLTAGE (V)
IN
OUT
1174 G13
1174 G14
1174 G15
1174fe
5