Datasheet

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