LTC1174
LTC1174-3.3/LTC1174-5
ELECTRICAL CHARACTERISTICS
Note 3: Guaranteed by design.
Note 5: Current into Pin 6 only, measured without electrolytic input
capacitor.
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: The off-time is wafer-sort trimmed.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
Efficiency vs Load Current
Efficiency vs Load Current
100
95
90
85
80
75
70
100
95
90
85
80
75
70
100
95
90
85
80
75
70
V
= 6V
IN
V
= 6V
IN
V
= 6V
IN
V
= 9V
IN
V
= 9V
IN
V
= 9V
IN
L = 50µH
L = 50µH
L = 100µH
V
PGM
COIL = CTX50-4
= 5V
= 0V
OUT
V
PGM
COIL = CTX50-4
= 5V
V
= 5V
OUT
OUT
I
I
= V
I
= V
IN
PGM IN
COIL = CTX100-4
1
10
LOAD CURRENT (mA)
100 200
1
10
100
400
1
10
100
500
LOAD CURRENT (mA)
LOAD CURRENT (mA)
1174 G01
1174 G02
1174 G03
Efficiency vs Load Current
Efficiency vs Load Current
Efficiency vs Load Current
100
90
80
70
60
50
100
90
80
70
60
50
100
90
80
70
60
50
V
= 5V
IN
V
= 5V
V
V
IN
= 5V
IN
V
= 9V
= 9V
V
= 9V
IN
IN
IN
L = 50µH
V
L = 50µH
L = 100µH
= 3.3V
V
= 3.3V
V
= 3.3V
OUT
PGM
OUT
PGM
COIL = CTX50-4
OUT
I
= 0V
I
= V
I
= V
IN
PGM IN
COIL = CTX100-4
COIL = CTX50-4
1
10
100
300
1
10
100
500
1
10
100 500
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
1174 G04
1174 G05
1174 G06
1174fe
4