Datasheet

3
LT1932
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Switch Saturation Voltage (V
CESAT
)
SWITCH CURRENT (mA)
0
SWITCH SATURATION VOLTAGE (mV)
150
200
250
300
500
1932 G01
100
50
0
100 200 400
300
350
400
600
T
J
= 125°C
T
J
= –50°C
T
J
= 25°C
TEMPERATURE (°C)
–50
400
500
700
25 75
1932 G02
300
200
–25 0
50 100 125
100
0
600
PEAK CURRENT (mA)
V
IN
= 1.2V
V
IN
= 10V
TEMPERATURE (°C)
–50
0
SWITCHING FREQUENCY (MHz)
0.2
0.6
0.8
1.0
2.0
1.4
0
50
75
1932 G03
0.4
1.6
1.8
1.2
–25
25
100
125
V
IN
= 1.2V
V
IN
= 10V
Switch Current Limit Switching Frequency
LED Pin Voltage LED Current
LED CURRENT (mA)
0
LED PIN VOLTAGE (mV)
150
200
250
15 25
1932 G04
100
50
0
510 20
300
350
400
4030 35
T
J
= 125°C
T
J
= 25°C
T
J
= –50°C
TEMPERATURE (°C)
–50
LED CURRENT (mA)
35
25
1932 G05
20
10
–25 0 50
5
0
40
45
50
30
25
15
75 100 125
R
SET
= 750Ω
R
SET
= 562Ω
R
SET
= 1.50k
R
SET
= 4.53k
Quiescent Current SHDN Pin Current
LED Current
INPUT VOLTAGE (V)
0
LED CURRENT (mA)
35
6
1932 G06
20
10
24
5
0
40
45
50
30
25
15
810
R
SET
= 750Ω
R
SET
= 562Ω
R
SET
= 1.50k
R
SET
= 4.53k
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (mA)
1.75
25
1932 G07
1.00
0.50
–25 0 50
0.25
0
2.00
1.50
1.25
0.75
75 100 125
V
IN
= 1.2V
V
IN
= 10V
SHDN PIN VOLTAGE (V)
0
SHDN PIN CURRENT
30
40
50
8
1932 G08
20
10
25
35
45
15
5
0
2
4
6
10
T
J
= 125°C
T
J
= 25°C
T
J
= –50°C
Switching Waveforms
V
SW
10V/DIV
I
L1
200mA/DIV
V
OUT
20mV/DIV
AC COUPLED
I
LED
10mA/DIV
V
IN
= 3V 0.5µs/DIV
1093 G09
4 WHITE LEDs
I
LED
= 15mA
CIRCUIT ON FIRST PAGE
OF THIS DATA SHEET