lt1432 Linear Technology Corporation, lt1432 Datasheet - Page 4

• Manufacturer Part Number: lt1432
• Description: 3.3v High Efficiency Step-down Switching Regulator Controller
• Manufacturer: Linear Technology Corporation

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