Datasheet

LTC3735
6
3735fa
TYPICAL PERFORMANCE CHARACTERISTICS
Maximum Current Sense
Threshold vs Temperature RUN/SS Current vs Temperature
Current Sense Pin Input Current
vs Temperature
Oscillator Frequency
vs Temperature
Constant Frequency Low Current
Mode (Figure 14) Start-Up Sequence (Figure 14)
Load Regulation (Without AVP) SENSE Pins Total Source Current
LOAD CURRENT (A)
0
NORMALIZED V
OUT
(%)
–0.2
–0.1
20
3735 G10
–0.3
–0.4
5
10
15
25
0.0
V
PSIB
= 5V
V
IN
= 15V
FIGURE 1
V
SENSE
COMMON MODE VOLTAGE (V)
0
I
SENSE
(µA)
0
3735 G12
–50
–100
2 4
50
100
6
TEMPERATURE (°C)
–50 –25
70
68
V
SENSE
(mV)
74
0
50
75
3735 G13
72
78
76
25
100
125
TEMPERATURE (°C)
–50 –25
0
RUN/SS CURRENT (µA)
0.2
0.6
0.8
1.0
75 10050
1.8
3735 G14
0.4
0 25 125
1.2
1.4
1.6
TEMPERATURE (°C)
–50 –25
–7
CURRENT SENSE INPUT CURRENT (µA)
–9
–12
0
50
75
3735 G18
–8
–11
–10
25
100
125
V
OUT
= 1.6V
TEMPERATURE (°C)
–50
700
600
500
400
300
200
100
25 75
3735 G19
–25 0
50 100 125
FREQUENCY (kHz)
V
FREQSET
= 2.4V
V
FREQSET
= 1.2V
V
FREQSET
= 0V
V
OUT(AC)
20mV/DIV
I
L1
1A/DIV
I
L2
1A/DIV
V
PSIB
= 0V
2µs/DIV
3735 G17
V
IN
= 15V, V
OUT
= 1.6V, I
LOAD
= 400mA
V
RON
2V/DIV
V
CC – CORE
500mV/DIV
PGOOD
2V/DIV
MCH –PGOOD
2V/DIV
500µs/DIV
V
BOOT
= 1.37V
V
ID
= 1.228V
C1 MAX
3.28V
C2 MAX
1.37V
C3 MAX
3.24V
C4 MAX
3.20V
3735 G16