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| LTC3355_15 Datasheet, PDF (6/20 Pages) Linear Technology – 20V 1A Buck DC/DC with Integrated SCAP Charger and Backup Regulator | |||
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LTC3355
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted
Boost Switch Current Limit vs
Temperature
5.2
5.1
VOUT = 3.3V
5.0
4.9
VOUT = 4V
4.8
4.7
VOUT = 5V
4.6
4.5
4.4
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
3355 G10
Charge Current vs VINS-VIN
1200
1000
VIN = 7V
VOUT = 3.3V
800
600
400
200
0
30 32 34 36 38 40 42 44 46 48 50
VINS-VIN (mV)
3355 G13
Buck Load Regulation
4.050
4.045
4.040
4.035
4.030
4.025
4.020
4.015
4.010
4.005
4.000
0
PWM MODE
VIN = 18V
VIN = 12V
VIN = 6V
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
LOAD CURRENT (A)
3355 G16
Buck Switch Current Limit vs
Temperature
1.8
VIN = 12V
1.7
VOUT = 5V
VOUT = 3.3V
1.6
VOUT = 4V
1.5
1.4
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
3355 G11
Charge Current vs VOUT-VCAP
1200
1000
VIN = 7V
VOUT = 3.3V
800
RICHG = 60.4k
600
400
200
RICHG = 604k
0
0 100 200 300 400 500 600 700 800
VOUT-VCAP (mV)
3355 G14
Buck Line Regulation
4.050
PWM MODE
4.045
4.040
IOUT = 50mA
4.035
4.030
IOUT = 500mA
4.025
4.020
4.015
4.010
4.005
4.000
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
VIN (V)
3355 G17
VOUT vs VINS-VIN
4.0
3.5
3.0
2.5
2.0
1.5
1.0
VIN = 7V
0.5 VOUT = 3.3V
IVOUT = 200mA
0
40 41 42 43 44 45 46 47 48 49 50
VINS-VIN (mV)
3355 G12
Charge Current
vs Junction Temperature
300
250
200
150
100
50
0
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
3355 G15
Boost Load Regulation
4.050
4.045
4.040
4.035
4.030
4.025
4.020
4.015
4.010
4.005
4.000
0.001
PWM MODE
VCAP = 3.6V
VCAP = 2.4V
VCAP = 1.5V
0.01
0.1
1
LOAD CURRENT (A)
3355 G18
3355fb
6
For more information www.linear.com/LTC3355
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