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