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LTC1433I Datasheet

  • LTC1433I

  • Linear Technology [450mA, Low Noise Current Mode Step-Down ...

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

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