Datasheet

5
LTC1174
LTC1174-3.3/LTC1174-5
1174fe
Supply Current in Shutdown
Switch Resistance vs
Input Voltage
Efficiency vs Input Voltage
DC Supply Current
Operating Frequency
vs V
IN
– V
OUT
Off-Time vs Output Voltage
TYPICAL PERFOR A CE CHARACTERISTICS
UW
INPUT VOLTAGE (V)
5
EFFICIENCY (%)
7
9
10 14
1174 G10
68
11
12
13
95
94
93
92
91
90
89
V
OUT
= 5V
L = 100µH
COIL = CTX100-4
I
LOAD
= 300mA
I
PGM
= V
IN
I
LOAD
= 100mA
I
PGM
= 0V
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (µA)
8
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1174 G11
414
2
6
10 12
SHUTDOWN = 0V
T
A
= 25°C
CURRENT INTO PIN 6 ONLY
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (µA)
500
450
400
350
300
250
200
150
100
50
0
4
8
10
1174 G12
2
6
12
14
ACTIVE MODE
I
PGM
= V
IN
SLEEP MODE
I
PGM
= 0V
T
A
= 25°C
(V
IN
– V
OUT
) VOLTAGE (V)
0
NORMALIZED FREQUENCY
9
1174 G13
2
57
2.0
1.5
1.0
0.5
0
1
3
4
6
8
V
OUT
= 5V
T
A
= 25°C
T
A
= 70°C
INPUT VOLTAGE (V)
4
RDS
(ON)
(Ω)
12
1174 G14
6
8
10
14 16 18 20
T
A
= 25°C
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
LTC1174HV
LTC1174
OUTPUT VOLTAGE (V)
0
OFF-TIME (µs)
50
40
30
20
10
0
4
1174 G15
1
2
3
5
LTC1174-5
LTC1174HV-5
LTC1174-3.3
LTC1174HV-3.3
Line Regulation
Switch Leakage Current
vs Temperature Efficiency vs Input Voltage
INPUT VOLTAGE (V)
0
∆V
OUT
(mV)
6
4
2
0
–2
–4
–6
–8
–10
–12
–14
4
8
10
1174 G07
2
6
12
14
I
LOAD
= 100mA
I
PGM
= 0V
TEMPERATURE (°C)
0
LEAKAGE CURRENT (nA)
180
160
140
120
100
80
60
40
20
0
40
80
100
1174 G08
20 60
V
IN
= 13.5V
INPUT VOLTAGE (V)
5
EFFICIENCY (%)
14
1174 G09
7
9
12
95
94
93
92
91
90
89
88
87
68
10 11 13
L = 100µH
L = 50µH
V
OUT
= 5V
I
PGM
= 0V
I
LOAD
= 75mA
CORE = CTX (Kool Mµ
®
)