Datasheet

LTM4615
19
4615fb
For more information www.linear.com/LTM4615
applicaTions inForMaTion
PGOOD1
PGOOD1
FB1
COMP1
TRACK1
RUN/SS1
LDO_IN
EN3
BOOST3
GND1
GND2
LTM4615
GND3
V
IN1
V
IN2
V
OUT1
V
IN
1.2V
V
IN
3V TO 5.5V
R
FB1
10k
R3
10k
22µF
6.3V
22µF
6.3V
C
OUT2
100µF
6.3V
C11
10µF
6.3V
C
OUT1
22µF
6.3V
22µF
6.3V
C12
10µF
C
IN1
10µF
6.3V
C
IN2
10µF
6.3V
100µF
6.3V
V
OUT1
1.2V
4A
L1 0.2µH*
PGOOD2
PGOOD2
FB2
COMP2
TRACK2 V
IN
RUN/SS2
LDO_OUT
FB3
PGOOD3 PGOOD3
V
OUT2
*FAIR-RITE 0805 2508056007Y6
IF MORE FILTERING REQUIRED
R
FB2
5.76k
R6
10k
4615 F12
V
OUT3
V
OUT3
1V LOW NOISE AT 1A
R5
3.32k
R4
10k
V
OUT2
1.5V
4A
Figure 12. Typical 3V to 5.5V
IN
, 1.5V and 1.2V at 4A and 1V at 1A Design
Table 4. Output Voltage Response vs Component Matrix (Refer to Figure 12) 0A to 2.5A Load Step Typical Measured Values
C
OUT1
AND C
OUT2
CERAMIC VENDORS VALUE P
ART NUMBER
C
OUT1
AND C
OUT2
BULK VENDORS VALUE P
ART NUMBER
TDK 22µF 6.3V C3216X7SOJ226M Sanyo POSCAP 150µF 10V 10TPD150M
Murata 22µF 16V GRM31CR61C226KE15L Sanyo POSCAP 220µF 4V 4TPE220MF
TDK 100µF 6.3V C4532X5R0J107MZ C
IN
BULK VENDORS VALUE PART NUMBER
Murata 100µF 6.3V GRM32ER60J107M Sanyo POSCAP 100µF 10V 10CE100FH
V
OUT
(V)
C
IN
(CERAMIC)
C
IN
(BULK)*
C
OUT1
AND C
OUT2
(CER) EACH
C
OUT1
AND C
OUT2
(POSCAP) EACH I
TH
V
IN
(V)
DROOP
(mV)
PEAK-TO-PEAK
DEVIATION
RECOVER
Y
TIME (µs)
LOAD STEP
(A/µs)
R
FB
(kΩ)
1.2
10µF ×
2
100µF
100µF, 22µF ×2
None None 5 33 68 11 2.5 10
1.2
10µF ×2
100µF
22µF ×1
220µF None 5 25 50 9 2.5 10
1.2
10µF ×2
100µF
100µF, 22µF ×2
None None 3.3 33 68 8 2.5 10
1.2
10µF ×2
100µF
22µF ×1
220µF None 3.3 25 50 10 2.5 10
1.5
10µF ×2
100µF
100µF, 22µF ×2
None None 5 30 60 11 2.5 5.76
1.5
10µF ×2
100µF
22µF ×1
220µF None 5 28 60 11 2.5 5.76
1.5
10µF ×2
100µF
100µF, 22µF ×2
None None 3.3 30 60 10 2.5 5.76
1.5
10µF ×2
100µF
22µF ×1
220µF None 3.3 27 56 10 2.5 5.76
1.8
10µF ×2
100µF
100µF, 22µF ×2
None None 5 34 68 12 2.5 3.92
1.8
10µF ×2
100µF
22µF ×1
220µF None 5 30 60 12 2.5 3.92
1.8
10µF ×2
100µF
22µF ×1
220µF None 3.3 30 60 12 2.5 3.92
2.5
10µF ×2
None
22µF ×1
None None 5 50 90 10 2.5 2.37
2.5
10µF ×2
100µF
22µF ×1
150µF None 5 33 60 10 2.5 2.37
2.5
10µF ×2
100µF
22µF ×1
150µF None 3.3 50 95 12 2.5 2.37
3.3
10µF ×2
100µF
22µF ×1
150µF None 5 50 90 12 2.5 1.62
*Bulk capacitance is optional if V
IN
has very low input impedance.