LTC3251_15 Datasheet, PDF (4/16 Pages) Linear Technology – 500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter

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