LTM4616
APPLICATIONS INFORMATION
Table 3. Output Voltage Response Versus Component Matrix (Refer to Figure 18) 0A to 3A Load Step
TYPICAL MEASURED VALUES
C
VENDORS
VALUE
PART NUMBER
C
VENDORS
OUT2
VALUE
PART NUMBER
4TPE470M
OUT1
TDK
22µF, 6.3V
22µF, 16V
100µF, 6.3V
100µF, 6.3V
C3216X7S0J226M
GRM31CR61C226K
C4532X5R0J107MZ
GRM32ER60J107M
Sanyo POSCAP
470µF, 4V
Murata
TDK
C
(BULK) VENDORS VALUE
PART NUMBER
10CE100FH
IN
SUNCON
100µF, 10V
Murata
V
C
C
C
C
V
(V)
DROOP PEAK-TO- PEAK
RECOVERY
TIME (µs)
LOAD STEP
R
FB
OUT
IN
IN
OUT1
OUT2
IN
(V)
1.0
1.0
1.0
1.0
1.2
1.2
1.2
1.2
1.5
1.5
1.5
1.5
1.5
1.5
1.8
1.8
1.8
1.8
1.8
1.8
2.5
2.5
2.5
2.5
3.3
3.3
(CERAMIC) (BULK)* (CERAMIC)
(BULK)
I
C1
C3
(mV)
20
30
30
25
20
20
30
30
32
25
22
25
30
25
42
25
35
25
35
35
35
32
50
32
65
40
DEVIATION (mV)
(A/µs)
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
(kΩ)
14.7
14.7
14.7
14.7
10
TH
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF
100µF × 2
100µF × 2
100µF × 2
22µF × 1
100µF × 2
22µF × 1
100µF × 2
22µF × 1
100µF × 2
22µF × 1
100µF × 1
22µF × 1
100µF × 2
22µF × 1
100µF × 1
22µF × 1
100µF × 2
22µF × 1
100µF × 2
22µF × 1
100µF × 1
22µF × 1
100µF × 1
22µF × 1
100µF × 1
22µF × 1
470µF
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
5
40
60
60
50
40
41
60
60
64
50
42
50
60
50
80
50
70
50
70
20
40
65
100
65
135
87
40
25
25
25
25
25
20
25
20
25
25
25
25
25
25
30
30
30
30
30
30
40
30
40
30
40
5
2.7
2.7
5
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
5
10
2.7
2.7
5
10
10
6.65
6.65
6.65
6.65
6.65
6.65
4.87
4.87
4.87
4.87
4.87
4.87
3.09
3.09
3.09
3.09
2.21
2.21
5
3.3
3.3
2.7
2.7
5
5
3.3
3.3
2.7
2.7
5
5
3.3
3.3
5
5
*Bulk capacitance is optional if V has very low input impedance.
IN
forthosewhowishtoperformadditionalstabilityanalysis.
Multiphase operation will reduce effective output ripple as
a function of the number of phases. Application Note 77
discusses this noise reduction versus output ripple cur-
rent cancellation, but the output capacitance will be more
afunctionofstabilityandtransientresponse.LTpowerCAD
also calculates the output ripple reduction as the number
of phases increases.
Burst Mode Operation
The LTM4616 is capable of Burst Mode operation on each
regulator in which the power MOSFETs operate intermit-
tentlybasedonloaddemand,thussavingquiescentcurrent.
For applications where maximizing the efficiency at very
light loads is a high priority, Burst Mode operation should
be applied. To enable Burst Mode operation, simply tie the
MODEpintoV .Duringthisoperation,thepeakcurrentof
IN
the inductor is set to approximately 20% of the maximum
4616fe
12
For more information www.linear.com/LTM4616
LINEAR_DIMENSIONS [ Linear Dimensions ]
