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| LTC3408_15 Datasheet, PDF (3/12 Pages) Linear Technology – 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor | |||
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LTC3408
ELECTRICAL CHARACTERISTICS
Note 4: When VREF > 1.2V and VREF x3 > VIN, the P-channel FET will be on
in parallel with the bypass PFET reducing the overall RDS(ON).
Note 5: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1)
Efficiency vs VOUT
110
TA = 25°C
VIN = 3.6V
100
100mA
90
600mA
80
70
60
50
0
1
2
VOUT (V)
3
4
3408 G02
Efficiency vs Output Current
100
TA = 25°C
90 VOUT = 2.5V
80
70
60
VIN = 3.6V
VIN = 4.2V
50
40
30
20
10
0
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3408 G05
Efficiency vs Output Current
100
TA = 25°C
90 VOUT = 1.2V
80
70
60
VIN = 3.6V
50
VIN = 4.2V
40
30
20
10
0
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3408 G03
Oscillator Frequency
vs Temperature
1.70
VIN = 3.6V
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
3408 G06
Efficiency vs Output Current
100
TA = 25°C
90 VOUT = 1.5V
80
70
60
VIN = 3.6V
VIN = 4.2V
50
40
30
20
10
0
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
3408 G04
Oscillator Frequency
vs Supply Voltage
1.8
TA = 25°C
1.7
1.6
1.5
1.4
1.3
1.2
2
3
4
5
SUPPLY VOLTAGE (V)
6
3408 G07
3408f
3
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