lt1432 Linear Technology Corporation, lt1432 Datasheet - Page 5

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

TYPICAL PERFOR
–20
–40
2.0
1.0
0.5
1.5
40
20
40
20
10
30
0
0
0
* TO CALCULATE TOTAL BATTERY CURRENT IN Burst
0
0
Mode OPERATION, MULTIPLY LOAD CURRENT BY
INCREMENTAL FACTOR AND ADD NO-LOAD CURRENT.
0
Incremental Battery Current * in
Burst Mode Operation
Line Regulation
Restart Load Current
T
T
V
J
J
OUT
= 25 C
= 25 C
JUNCTION TEMPERATURE ( C)
= 4.5V
5
25
5
BATTERY VOLTAGE (V)
INPUT VOLTAGE (V)
10
NORMAL MODE
Burst Mode OPERATION
10
50
15
15
75
W
20
LT1432-3.3 G16
LT1432-3.3 G10
LT1432-3.3 G13
A
U
100
25
20
CE
C
HARA TERISTICS
–50
–75
–25
25
5
4
1
0
4
2
1
0
3
2
0
3
0
0
0
No Load Battery Current in Burst
Mode Operation
Burst Mode Operation Load
Regulation
Restart Time Delay
T
V
T
J
J
IN
= 25 C
= 25 C
= 7V
20
JUNCTION TEMPERATURE ( C)
5
C
25
BATTERY VOLTAGE (V)
LOAD CURRENT (mA)
40
10
50
15
60
75
80
20
LT1432-3.3 G14
LT1432-3.3 G16
LT1432-3.3 G11
100
100
25
5000
3000
2000
1000
4000
–40
–60
–80
–20
–40
–20
60
40
20
0
5
0
–2
0
Transconductance – V
Current
0
Mode Pin Current
Start-up Switch Characteristics
Gm =
T
T
J
J
= 25 C
= 25 C
MODE DRIVE MUST
SINK 30 A AT 0V
JUNCTION TEMPERATURE ( C)
–1
2
I(V
25
MODE PIN VOLTAGE (V)
V
C
OUT
V
PIN)
+
TO V
0
4
LT1432-3.3
IN
50
NOTE VERTICAL AND
HORIZONTAL SCALE
CHANGES AT 0,0
VOLTAGE
10
6
OUT
75
to V
20
8
LT1432-3.3 G18
LT1432-3.3 G15
LT1432-3.3 G12
C
5
100
30
10