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LTC3250 Datasheet, PDF (3/12 Pages) Linear Technology – High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter
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LTC3250-1.5/LTC3250-1.2
TYPICAL PERFOR A CE CHARACTERISTICS
No Load Supply Current vs
Supply Voltage
50 3.1V < VIN < 5.5V (LTC3250-1.5)
2.7V < VIN < 5.5V (LTC3250-1.2)
45
TA = 85°C
40
TA = 25°C
35
TA = –40°C
30
25
20
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
3250 G01
(LTC3250-1.5)
Output Voltage vs Load Current
1.60
1.58
VIN = 3.6V
TA = 25°C
1.56
1.54
1.52
1.50
1.48
1.46
1.44
1.42
1.40
0
50 100 150 200 250 300
IOUT (mA)
3250 G04
(LTC3250-1.2)
Output Voltage vs Load Current
1.30
1.28
VIN = 3.6V
TA = 25°C
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
0
50 100 150 200 250 300
IOUT (mA)
3250 G12
Oscillator Frequency vs
Supply Voltage
1.8 3.1V < VIN < 5.5V (LTC3250-1.5)
2.7V < VIN < 5.5V (LTC3250-1.2)
1.7
1.6
TA = 85°C
1.5
1.4
TA = 25°C
TA = –40°C
1.3
1.2
2.7 3.2 3.7 4.2 4.7 5.2
VIN (V)
3250 G02
VSHDN Threshold Voltage vs
Supply Voltage
1200 3.1V < VIN < 5.5V (LTC3250-1.5)
1100 2.7V < VIN < 5.5V (LTC3250-1.2)
1000
900
TA = –40°C
800
TA = 25°C
700
TA = 85°C
600
500
400
2.7 3.2 3.7 4.2 4.7 5.2
VIN (V)
3250 G03
Efficiency vs Output Current
100
TA = 25°C
90
VIN = 3.3V
80
VIN = 3.6V
70
VIN = 4V
60
50
VIN = 5V
40
30
20
10
0
0.1
1
10
100
1000
IOUT (mA)
3250 G05
Output Voltage vs Supply Voltage
1.60
TA = 25°C
1.58
1.56
1.54
1.52
IOUT = 0mA
IOUT = 100mA
1.50
1.48
IOUT = 250mA
1.46
1.44
1.42
1.40
3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
3250 G06
Efficiency vs Output Current
100
TA = 25°C
90
80
70
60
VIN = 2.7V
VIN = 3V
VIN = 3.5V
50
VIN = 4.5V
40
30
20
10
0
0.1
1
10
100
1000
IOUT (mA)
3250 G13
Output Voltage vs Supply Voltage
1.30
TA = 25°C
1.28
1.26
1.24
IOUT = 0mA
1.22
IOUT = 100mA
1.20
1.18
IOUT = 250mA
1.16
1.14
1.12
1.10
2.7 3.2 3.7 4.2 4.7 5.2
VIN (V)
3250 G14
3250fa
3
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