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