LTC3735 Datasheet, PDF (6/32 Pages) Linear Technology – 2-Phase, High Efficiency DC/DC Controller for Intel Mobile CPUs

LTC3735
TYPICAL PERFORMANCE CHARACTERISTICS
Load Regulation (Without AVP)
0.0
V_PSIB = 5V
V_IN = 15V
FIGURE 1
–0.1
SENSE Pins Total Source Current
100
50
–0.2
0
–0.3
–50
–0.4
0
5
10
15
20
25
LOAD CURRENT (A)
3735 G10
–100
0
2
4
6
V_SENSE COMMON MODE VOLTAGE (V)
3735 G12
Maximum Current Sense
Threshold vs Temperature
78
76
74
72
70
68
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3735 G13
RUN/SS Current vs Temperature
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3735 G14
Current Sense Pin Input Current
vs Temperature
–12
V_OUT = 1.6V
–11
–10
–9
–8
–7
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3735 G18
Oscillator Frequency
vs Temperature
700
600
V_FREQSET = 2.4V
500
Constant Frequency Low Current
Mode (Figure 14)
V_IN = 15V, V_OUT = 1.6V, I_LOAD = 400mA
V_OUT(AC)
20mV/DIV
I_L1
1A/DIV
Start-Up Sequence (Figure 14)
V_RON
2V/DIV
V_{CC – CORE}
500mV/DIV
C1 MAX
3.28V _{VBOOT = 1.37V}
C2 MAX
1.37V
V_ID = 1.228V
400
V_FREQSET = 1.2V
300
V_FREQSET = 0V
200
100
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3735 G19
I_L2
1A/DIV
V_PSIB = 0V
2µs/DIV
PGOOD
2V/DIV
3735 G17
MCH –PGOOD
2V/DIV
C3 MAX
3.24V
C4 MAX
3.20V
500µs/DIV
3735 G16
3735fa
6