Table of Contents
Advertisement
LT1933
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency, V
= 5V
OUT
100
T
= 25°C
A
V
= 5V
OUT
90
V
= 12V
IN
V
= 24V
IN
80
70
D1 = MBRM140
L1 = Toko D53LCB 33μH
60
0
100
200
300
LOAD CURRENT (mA)
Maximum Load Current
800
T
= 25°C
A
V
= 5V
OUT
700
L = 33μH
600
L = 22μH
500
400
0
5
10
15
INPUT VOLTAGE (V)
Feedback Voltage
1.260
1.255
1.250
1.245
1.240
1.235
1.230
–50 –25
0
25
50
75
TEMPERATURE (°C)
4
Effi ciency, V
100
T
= 25°C
A
V
OUT
90
80
70
60
400
500
600
0
100
1933 G01
Maximum Load Current
800
T
= 25°C
A
V
OUT
700
600
500
400
0
20
25
30
1933 G04
Undervoltage Lockout
3.8
3.6
3.4
3.2
3.0
100
125
150
–50 –25
1933 G07
= 3.3V
OUT
= 3.3V
V
= 5V
IN
V
= 12V
IN
V
= 24V
IN
D1 = MBRM140
L1 = Toko D53LCB 22μH
200
300
400
500
600
LOAD CURRENT (mA)
1933 G02
= 3.3V
L = 22μH
L = 15μH
5
10
15
20
25
30
INPUT VOLTAGE (V)
1933 G05
0
25
50
75
100
125
150
TEMPERATURE (°C)
1933 G08
Switch Current Limit
1200
T
= 25°C
A
TYPICAL
1000
800
MINIMUM
600
400
200
0
0
20
40
60
DUTY CYCLE (%)
Switch Voltage Drop
600
500
T
= 25°C
A
400
T
= 85°C
A
300
200
100
0
0
0.1
0.2
0.3
0.4
SWITCH CURRENT (A)
Switching Frequency
600
550
500
450
400
–50 –25
0
25
50
75
100
TEMPERATURE (°C)
80
100
1933 G03
T
= –40°C
A
0.5
0.6
1933 G06
125
150
1933 G09
1933fe
Advertisement
Table of Contents
Need help?
Do you have a question about the LT1933 and is the answer not in the manual?