LT1432-3.3 Ver la hoja de datos (PDF) - Linear Technology
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LT1432-3.3 Datasheet PDF : 8 Pages
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LT1432-3.3
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage
100
TJ = 25°C
LT1271, L = 50µH
90
DIODE TO OUTPUT
80
DIODE TO INPUT
IOUT = 1A
70
60
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
LT1432-3.3 G01
Minimum Input Voltage –
Normal Mode (Diode to Output)
9.0
TJ = 25°C
8.0
7.0
LT1171
6.0
5.0
LT1271
DIODE
TO INPUT
4.0
0
1
2
3
4
5
OUTPUT CURRENT (A)
LT1432-3.3 G04
Shutdown Current vs Input
Voltage
50
TJ = 25°C
40
30
20
10
0
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
LT1432-3.3 G07
4
Efficiency vs Load Current
95
TJ = 25°C
VIN = 7V
90
LT1270
85
LT1271
80
75
0
0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
LT1432-3.3 G02
Minimum Running Voltage –
Normal Mode*
5.5
TJ = 25°C
5.0
LT1171
LT1271
4.5
LT1270
4.0
3.5
3.0
0
1
2
3
4
5
OUTPUT CURRENT (A)
LT1432-3.3 G05
*SEE MINIMUM INPUT VOLTAGE TO START
Battery Current in Shutdown*
40
Minimum Input Voltage to Start –
Normal Mode (Diode to Input)
6.5
TJ = 25°C
6.0
5.5
DIODE
TO INPUT
5.0
LT1270
LT1171
4.5
LT1271
4.0
0
1
2
3
4
5
OUTPUT CURRENT (A)
LT1432-3.3 G03
Burst Mode Operation Minimum
Input Voltage
5.5
TJ = 25°C
5.0
4.5
4.0
3.5
0
10
20
30
40
50
LOAD CURRENT (mA)
LT1432-3.3 G06
Current Limit Sense Voltage*
80
30
70
VIN = 30V
20
60
VIN = 6V
10
50
0
0
25
50
75
100
TEMPERATURE (°C)
LT1432-3.3 G08
*DOES NOT INCLUDE LT1271 SWITCH LEAKAGE.
40
0
25
50
75
100
JUNCTION TEMPERATURE (°C)
LT1432-3.3 G9
* TEMPERATURE COEFFICIENT OF SENSE VOLTAGE IS
DESIGNED TO TRACK COPPER RESISTANCE.
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