Datasheet

LTC1773
4
1773fb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Maximum Current Sense
Threshold vs V
RUN/SS
Maximum Current Sense
Threshold vs Temperature
Maximum Current Sense
Threshold vs V
ITH
Oscillator Frequency vs
Temperature
Load Step (Burst Mode
Operation)
Burst Mode Operation
RUN/SS Pin Current vs
Temperature
Start-Up
Load Step (Continuous
Mode)
V
RUN/SS
(V)
0.5
MAXIMUM CURRENT SENSE THRESHOLD (mV)
120
100
80
60
40
20
0
2.0 3.0
1773 G07
1.0 1.5
2.5 3.5 4.0
TEMPERATURE (°C)
80
1773 G08
–40
0
40–60 – 20 20
60
140120100
MAXIMUM CURRENT SENSE THRESHOLD (mV)
100
105
95
85
TEMPERATURE (°C)
–60 –40 –20
FREQUENCY (kHz)
540
550
100 1208040
1773 G10
530
520
0
20
60
140
560
TEMPERATURE (°C)
–60 –40 –20
RUN/SS CURRENT (µA)
1.5
2.0
100 1208040
1773 G11
1.0
0.5
0
20
60
140
2.5
1773 G12
I
LOAD
= 100mA
SEE FIGURE 9
I
L
500mA/DIV
V
OUT
20mV/DIV
V
IN
= 5V
V
OUT
= 2.5V
20µs/DIV
1773 G13
I
L
2A/DIV
V
RUN/SS
1V/DIV
V
OUT
2V/DIV
V
IN
= 5V
V
OUT
= 2.5V
40ms/DIV
SEE FIGURE 9
1773 G14
I
L
2A/DIV
V
OUT
100mV/DIV
V
IN
= 5V
V
OUT
= 2.5V
100mA TO 5A LOAD STEP
100µs/DIV
SEE FIGURE 9
1773 G15
I
L
2A/DIV
V
OUT
100mV/DIV
V
IN
= 5V
V
OUT
= 2.5V
100mA TO 5A LOAD STEP
100µs/DIV
SEE FIGURE 9
V
ITH
(V)
MAXIMUM CURRENT SENSE THRESHOLD (mV)
1773 G09
120
100
80
60
40
20
0
0
0.4
0.8
1.0
0.2 0.6
1.2
1.4
1.6
Burst Mode
OPERATION
FORCED
CONTINUOUS