Datasheet

4
LTC1433/LTC1434
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
LOAD CURRENT (A)
0.001
60
EFFICIENCY (%)
70
80
0.01 0.1 1
1433/34 G01
50
40
100
90
V
IN
= 5V
V
IN
= 12V
V
IN
= 3.6V
V
OUT
= 3.3V
L = 22µH
C
SOC
= 47pF
Efficiency of Figure 1 for L = 22µH
SUPPLY VOLTAGE (V)
3.2
OUTPUT VOLTAGE (V)
3.0
3.2
3.4
4.8
1433/34 G03
2.8
2.6
2.9
3.1
3.3
2.7
2.5
2.4
3.6
4.0
4.4
3.4 5.0
3.8
4.2
4.6
5.2
V
PROG
= 0V
L = 20µH
C
OSC
= 50pF
I
OUT
300mA
I
OUT
400mA
I
OUT
500mA
Dropout Characteristics at Different
Load Currents (V
OUT
= 3.3V)
SUPPLY VOLTAGE (V)
3
360
SUPPLY CURRENT (µA)
380
400
420
440
57
9
11
1433/34 G02
460
480
46
8
10
Supply Current vs Supply Voltage
Dropout Characteristics at Different
Load Currents (V
OUT
= 5V)
Maximum Output Current
vs Input Supply
SUPPLY VOLTAGE (V)
4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 6.2
OUTPUT VOLTAGE (V)
4.7
4.8
4.9
1433/34 G04
4.6
4.5
4.2
4.3
4.4
5.1
5.0
I
OUT

200mA
I
OUT

400mA
I
OUT

300mA
V
PROG
= V
IN

L = 20µH
C
OSC
= 50pF
SUPPLY VOLTAGE (V)
3
MAXIMUM OUTPUT CURRENT (mA)
500
600
700
800
11
1433/34 G05
400
300
200
5
7
9
13
V
OUT

3.3V
V
OUT

5V
L = 22µH
C
OSC
= 50pF
Reference Voltage
vs Temperature
TEMPERATURE (°C)
–45
REFERENCE VOLTAGE (V)
1.186
1.194
115
1433/34 G06
1.178
1.170
–5
35
75
–25
15
55
95
1.202
1.182
1.190
1.174
1.198
SUPPLY VOLTAGE (V)
3
R
DS(ON)
OF SMALL FET (Ω)
6
8
11
1433/34 G07
4
2
5
7
3
1
0
5
7
9
412
6
8
10
13
T
A
= 25°C
T
A
= 70°C
T
A
= 0°C
Switch Resistance of Small FET
Switch Leakage Current
vs Temperature
TEMPERATURE (°C)
0

40
50
70
60 100
1433/34 G09
30
20
20 40
80 120 140
10
0
60
160
200
280
120
80
40
0
240
SWITCH LEAKAGE AT SSW PIN (nA)
SWITCH LEAKAGE AT BSW PIN (nA)
V
IN
= 13.5V
SSW PIN
BSW PIN
Switch Resistance of Big FET
SUPPLY VOLTAGE (V)
3
R
DS(ON)
OF BIG FET (Ω)
1.2
1.6
2.0
11
1433/34 G08
0.8
0.4
0
1.4
1.8
1.0
0.6
0.2
5
7
9
412
6
8
10
13
T
A
= 70°C
T
A
= 0°C
T
A
= 25°C