Datasheet

LT1933
4
1933fe
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency, V
OUT
= 5V Effi ciency, V
OUT
= 3.3V Switch Current Limit
Maximum Load Current Maximum Load Current Switch Voltage Drop
Feedback Voltage Undervoltage Lockout Switching Frequency
LOAD CURRENT (mA)
0
80
90
100
300 400
1933 G01
70
100 200 600500
60
EFFICIENCY (%)
V
IN
= 24V
V
IN
= 12V
T
A
= 25°C
V
OUT
= 5V
D1 = MBRM140
L1 = Toko D53LCB 33
µH
LOAD CURRENT (mA)
0
80
90
100
300 400
1933 G02
70
100 200 600500
60
EFFICIENCY (%)
V
IN
= 24V
V
IN
= 12V
V
IN
= 5V
T
A
= 25°C
V
OUT
= 3.3V
D1 = MBRM140
L1 = Toko D53LCB 22
µH
DUTY CYCLE (%)
0
SWITCH CURRENT LIMIT (mA)
600
800
1200
1000
80
1933 G03
400
200
0
20
40
60
100
MINIMUM
TYPICAL
T
A
= 25°C
INPUT VOLTAGE (V)
0
LOAD CURRENT (mA)
600
700
20
1933 G04
500
400
5
10
15
3025
800
L = 22µH
L = 33µH
T
A
= 25°C
V
OUT
= 5V
INPUT VOLTAGE (V)
0
LOAD CURRENT (mA)
600
700
20
1933 G05
500
400
5
10
15
3025
800
L = 22µH
L = 15µH
T
A
= 25°C
V
OUT
= 3.3V
SWITCH CURRENT (A)
0
0
SWITCH VOLTAGE (mV)
100
200
300
400
600
500
0.2 0.4
1933 G06
0.60.1 0.3 0.5
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
TEMPERATURE (°C)
FEEDBACK VOLTAGE (V)
1.260
1.255
1.250
1.240
1.230
1.245
1.235
1933 G07
–50 –25 0 25 50 75 100 150125
TEMPERATURE (°C)
UVLO (V)
3.8
3.6
3.4
3.2
3.0
1933 G08
–50 –25 0 25 50 75 100 150125
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)
600
550
500
450
400
1933 G09
–50 –25 0 25 50 75 100 150125
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