6
LTC3445
3445fa
TYPICAL PERFOR A CE CHARACTERISTICS
W
Slew Rates DAC Min to DAC Max
Buck (DAC = Min)
100mA to 300mA Load Step
Buck Switching Frequency
vs V
CC1
Buck (DAC = Max)
100mA to 400mA Load Step
BUCK
VOLTAGE
50mV/DIV
LOAD
CURRENT
100mA/DIV
100祍/DIV
3445 G13
20祍/DIV
3445 G14
20祍/DIV
3445 G15
Buck Switching Frequency
vs Temperature
Soft-Start (DAC = Min and Max)
4.7& Load
BUCK
OUTPUTS
500mV/DIV
200祍/DIV
3445 G18
200mV/DIV
BUCK
VOLTAGE
50mV/DIV
LOAD
CURRENT
100mA/DIV
2.5
1.40
1.44
1.48
1.52
1.56
1.60
3.5
4.5
3445 G16
5.5
V
CC1
(V)
TEMPERATURE (癈)
50
1.460
1.440
1.480
1.500
0
50
100
150
3445 G17
1.520
1.540
1.560
25
25
75
125
V
CC
BATT vs V
CC1
PowerPath LDO Load Step
1mA to 5.5mA
V
CC1
RAMP (V)
0
0
1
2
3
V
CC1
4
3445 G19
5
6
V
TRACK
= V
BACKUP
= 2V
V
CC
BATT
V
CC
BATT vs V
TRACK
V
TRACK
RAMP (V)
0
0
1
2
3
4
3445 G20
5
6
V
CC1
= 5.5V
V
BACKUP
= 2V
V
CC
BATT
0mA
5mA
V
TRACK
V
CC
BATT
20mV/DIV
LOAD
CURRENT
10mA/DIV
200祍/DIV
3445 G21