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LTC3251 Fiches technique(PDF) 4 Page - Linear Technology

No de pièce LTC3251
Description  500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter
Download  16 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LTC3251 Fiches technique(HTML) 4 Page - Linear Technology

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4
LTC3251/
LTC3251-1.2/LTC3251-1.5
32511215fa
1.5V Output Voltage vs Supply
Voltage (Burst Mode Operation/
Continuous Mode)
VIN (V)
3
1.52
1.56
1.60
5
3251 G04
1.48
1.44
1.50
1.54
1.58
1.46
1.42
1.40
3.5
4
4.5
5.5
IOUT = 0mA
IOUT = 250mA
IOUT = 500mA
TA = 25°C
1.2V Output Voltage vs Supply
Voltage (Burst Mode Operation/
Continuous Mode)
VIN (V)
2.7
1.300
1.260
1.220
1.180
1.140
1.280
1.240
1.200
1.160
1.120
1.100
4.2
5.2
3251 G05
3.2
3.7
4.7
IOUT = 0mA
IOUT = 500mA
IOUT = 250mA
TA = 25°C
1.5V Output Voltage
vs Supply Voltage
(Super Burst Mode Operation)
VIN (V)
3
1.52
1.56
1.60
5
3251 G06
1.48
1.44
1.50
1.54
1.58
1.46
1.42
1.40
3.5
4
4.5
5.5
TA = 25°C
0mA
10mA
40mA
FB Voltage vs Output Current
(Burst Mode Operation/
Continuous Mode)
1.5V Output Efficiency vs Output
Current (Burst Mode Operation)
IOUT (mA)
0
0.780
0.785
0.790
0.795
0.800
0.805
100
200
300
400
3251 G07
500
600
TA = 25°C
VOUT = 1.5V
IOUT (mA)
0.1
0
10
30
40
50
100
70
1
10
3251 G08
20
80
90
60
100
1000
VIN = 3.3V
MD0 = VIN, MD1 = 0V
VIN = 4V
VIN = 5V
VIN = 3.6V
1.5V Output Efficiency vs Output
Current (Super Burst Mode
Operation)
IOUT (mA)
0.1
0
10
30
40
50
100
70
1
10
3251 G09
20
80
90
60
100
VIN = 3.3V
VIN = 4V
VIN = 5V
VIN = 3.6V
MD0 = MD1 = VIN
TYPICAL PERFOR A CE CHARACTERISTICS
No Load Supply Current
vs Supply Voltage
(Super Burst Mode Operation)
VIN (V)
2.7
20
16
12
8
4
18
14
10
6
2
0
4.2
5.2
3251 G02
3.2
3.7
4.7
85
°C
25
°C
–40
°C
1.2V Output Voltage
vs Supply Voltage
(Super Burst Mode Operation)
1.2V Output Efficiency vs Output
Current (Burst Mode Operation)
VIN (V)
2.7
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
4.2
5.2
3251 G18
3.2
3.7
4.7
0mA
10mA
40mA
TA = 25°C
IOUT (mA)
0.1
100
80
60
40
20
90
70
50
30
10
0
10
1000
3251 G19
1
100
VIN = 2.7V
VIN = 3.5V
VIN = 4.5V
VIN = 3V
MD0 = VIN, MD1 = 0V


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