Datasheet

LT1941
6
1941fb
TYPICAL PERFORMANCE CHARACTERISTICS
RUN/SS Thresholds
vs Temperature
Minimum Input Voltage
V
OUT2
= 5V
Minimum Input Voltage
V
OUT2
= 3.3V
Frequency vs Temperature
Switching Frequency
vs % of Feedback Voltage I
RUN/SS
vs Temperature
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
1.3
1.2
1.1
1.0
0.9
–25 0 25 50
1941 G13
75 100 125
% OF FEEDBACK VOLTAGE
0
0
SWITCHING FREQUENCY (MHz)
0.2
0.4
0.6
0.8
1.0
1.2
20 40 60 80
1941 G14
100
T
A
= 25°C
TEMPERATURE (°C)
–50
0
RUN/SS CURRENT (μA)
0.5
1.0
1.5
2.0
3.0
–25
02550
1941 G15
75 100 125
2.5
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
RUN/SS THRESHOLDS (V)
TEMPERATURE (°C)
–50 25 75
1941 G16
–25 0
50 100 125
TO SWITCH
TO RUN
LOAD CURRENT (mA)
1
5.0
MINIMUM INPUT VOLTAGE (V)
7.0
7.5
8.0
10 100 1000
1941 G17
6.5
6.0
5.5
V
IN
TO START
D
BOOST
= CMDSH-3
T
A
= 25°C
V
IN
TO RUN
BOOST DIODE
TIED TO
OUTPUT
BOOST DIODE
TIED TO
INPUT
LOAD CURRENT (mA)
1
3.0
MINIMUM INPUT VOLTAGE (V)
5.0
5.5
6.0
10 100 1000
1941 G18
4.5
4.0
3.5
V
IN
TO START
V
IN
TO RUN
BOOST DIODE
TIED TO
OUTPUT
BOOST DIODE
TIED TO
INPUT
D
BOOST
= CMDSH-3
T
A
= 25°C
BOOST1 Pin Current V
FB3
vs Temperature V
FB1
, V
FB2
vs Temperature
SW1 PIN CURRENT (A)
0
0
BOOST CURRENT (mA)
10
20
30
40
50
0.5
1 1.5 2
1941 G04
2.5 3
T
A
= 25°C
TEMPERATURE (°C)
–50
1.220
V
FB
(V)
1.235
1.250
1.265
1.280
–25 0 25 50
1941 G05
75 100 125
TEMPERATURE (°C)
–50
0.605
V
FB
(V)
0.615
0.625
0.635
0.645
–25 0 25 50
1941 G12
75 100 125