Datasheet

LT1941
5
1941fb
TYPICAL PERFORMANCE CHARACTERISTICS
SW1 Current Limit vs Duty Cycle SW2 Current Limit vs Duty Cycle BOOST2 Pin Current
SW1 V
CESAT
SW2 V
CESAT
SW3 V
CESAT
Effi ciency, V
OUT1
= 1.8V Effi ciency, V
OUT2
= 3.3V Effi ciency, V
OUT3
= –12V
LOAD CURRENT (A)
0
EFFICIENCY (%)
70
80
2
1941 G01
60
50
0.5
1
1.5
2.5
90
V
IN
= 5V
T
A
= 25°C
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
60
70
80
90
0.25 0.5 0.75 1
1941 G07
1.25 1.5
V
IN
= 5V
T
A
= 25°C
LOAD CURRENT (mA)
0
50
EFFICIENCY (%)
60
70
80
90
50 100 150 200
1941 G08
250 300
V
IN
= 5V
T
A
= 25°C
SWITCH CURRENT (A)
0
0
SWITCH VOLTAGE (mV)
100
200
300
400
500
0.5
1 1.5 2
1941 G02
2.5 3
T
A
= 25°C
DUTY CYCLE (%)
0
CURRENT LIMIT (A)
3.0
4.0
5.0
80
1941 G03
2.0
1.0
2.5
3.5
4.5
1.5
0.5
0
20
40
60
100
TYPICAL
MINIMUM
DUTY CYCLE (%)
0
0
CURRENT LIMIT (A)
0.5
1.0
1.5
2.0
2.5
3.0
20 40 60 80
1941 G06
100
TYPICAL
MINIMUM
SWITCH CURRENT (A)
0
0
SWITCH VOLTAGE (mV)
100
200
300
400
600
500
0.5 1
1941 G09
1.5 2
T
A
= 25°C
SW2 PIN CURRENT (A)
0
BOOST CURRENT (mA)
20
30
2
1941 G11
10
0
0.5
1
1.5
40
T
A
= 25°C
SWITCH CURRENT (A)
0
SWITCH VOLTAGE (mV)
100
200
300
400
500
1941 G10
0
0.25
0.5 0.75 1 1.25 1.5
T
A
= 25°C