Datasheet

LTM4618
17
4618fa
Table 2. 1.5V Output
DERATING CURVE V
IN
(V) POWER LOSS CURVE AIRFLOW (LFM) HEAT SINK Θ
JA
(°C/W)
Figures 9, 11 5, 12 Figure 7 0 None 16
Figures 9, 11 5, 12 Figure 7 200 None 12.2
Figures 9, 11 5, 12 Figure 7 400 None 11.2
Figures 10, 12 5, 12 Figure 7 0 BGA Heat Sink 15.2
Figures 10, 12 5, 12 Figure 7 200 BGA Heat Sink 11.6
Figures 10, 12 5, 12 Figure 7 400 BGA Heat Sink 10.7
Table 3. 3.3V Output
DERATING CURVE V
IN
(V) POWER LOSS CURVE AIRFLOW (LFM) HEAT SINK Θ
JA
(°C/W)
Figures 13, 15 12, 24 Figure 8 0 None 15
Figures 13, 15 12, 24 Figure 8 200 None 11.2
Figures 13, 15 12, 24 Figure 8 400 None 10.2
Figures 14, 16 12, 24 Figure 8 0 BGA Heat Sink 14.2
Figures 14, 16 12, 24 Figure 8 200 BGA Heat Sink 10.6
Figures 14, 16 12, 24 Figure 8 400 BGA Heat Sink 9.7
APPLICATIONS INFORMATION
Heat Sink Used: 15 × 9 Version of Aavid #375424B000346
Table 4. Output Voltage Response vs Component Matrix (Refer to Figure 21) 0A to 3A Load Step
V
OUT
(V)
C
IN
(CERAMIC)
C
IN
(BULK)
C
OUT1
(CERAMIC)
C
OUT2
(BULK) COMP
C2
(pF)
FREQ
(kHz)
DROOP
(mV)
P-P DEVIATION
(mV)
RECOVERY
TIME (μs)
LOAD STEP
(A/μs)
R
FB
(kΩ)
1 22µF × 2 68µF 100µF × 4 None None 100 400 38 76 35 3 242
1 22µF × 2 68µF 100µF × 2 220µF None None 400 35 70 35 3 242
1 22µF × 2 68µF 100µF 470µF None None 400 30 60 35 3 242
1.2 22µF × 2 68µF 100µF × 4 None None 47 400 40 80 30 3 121
1.2 22µF × 2 68µF 100µF × 2 220µF None None 400 37 74 35 3 121
1.2 22µF × 2 68µF 100µF 470µF None None 400 27 54 35 3 121
1.5 22µF × 2 68µF 100µF × 3 None None 47 500 48 96 36 3 68.1
1.5 22µF × 2 68µF 100µF 220µF None None 500 40 80 36 3 68.1
1.5 22µF × 2 68µF 100µF 470µF None None 500 30 60 40 3 68.1
1.8 22µF × 2 68µF 100µF × 3 None None 47 500 52 104 36 3 48.7
1.8 22µF × 2 68µF 100µF 220µF None None 500 45 90 35 3 48.7
1.8 22µF × 2 68µF 100µF × 4 None None 47 500 50 100 35 3 48.7
2.5 22µF × 2 68µF 100µF × 3 None None 47 500 65 130 38 3 28
2.5 22µF × 2 68µF 100µF × 4 None None None 600 75 150 35 3 28
2.5 22µF × 2 68µF 100µF 220µF None None 600 60 120 45 3 28
3.3 22µF × 2 68µF 100µF × 2 None None 22 600 90 180 36 3 19.1
3.3 22µF × 2 68µF 100µF × 2 None None 47 600 80 160 40 3 19.1
5 22µF × 2 68µF 100µF None None 47 600 150 300 40 3 11.5