DC1245A Linear Technology, DC1245A Datasheet - Page 11

• Manufacturer Part Number: DC1245A
• Description: BOARD DEMO LTM4616
• Manufacturer: Linear Technology
• Series: µModuler

Specifications of DC1245A

• Design Resources: LTM4616 Spice Model LTM4616 Gerber Files DC1245 Design Files
• Main Purpose: DC/DC, Step Down
• Outputs And Type: 2, Non-Isolated
• Power - Output: -
• Voltage - Output: 1.2V, 1.8V
• Current - Output: 8A, 8A
• Voltage - Input: 2.7 ~ 5.5 V
• Regulator Topology: Buck
• Frequency - Switching: 1.5MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LTM4616
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Table 3. Output Voltage Response Versus Component Matrix (Refer to Figure 18) 0A to 3A Load Step
TYPICAL MEASURED VALUES
C
TDK
Murata
TDK
Murata
*Bulk capacitance is optional if V
for those who wish to perform additional stability analysis.
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
a function of stability and transient response. LTpowerCAD
also calculates the output ripple reduction as the number
of phases increases.
applications inForMation
OUT1
V
(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
OUT
VENDORS
(CERAMIC)
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
C
IN
VALUE
22µF, 6.3V
22µF, 16V
100µF, 6.3V
100µF, 6.3V
(BULK)*
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
C
IN
IN
has very low input impedance.
(CERAMIC)
100µF × 2
100µF × 2
100µF × 2
100µF × 2
100µF × 2
100µF × 2
100µF × 1
100µF × 2
100µF × 1
100µF × 2
100µF × 2
100µF × 1
100µF × 1
100µF × 1
22µF × 1
22µF × 1
22µF × 1
22µF × 1
22µF × 1
22µF × 1
22µF × 1
22µF × 1
22µF × 1
22µF × 1
22µF × 1
22µF × 1
C
OUT1
PART NUMBER
C3216X7S0J226M
GRM31CR61C226K
C4532X5R0J107MZ
GRM32ER60J107M
(BULK)
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
470µF
C
OUT2
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
I
TH
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
C1
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
C3
C
Sanyo POSCAP
C
Sanyo
OUT2
IN
Burst Mode Operation
The LTM4616 is capable of Burst Mode operation on each
regulator in which the power MOSFETs operate intermit-
tently based on load demand, thus saving quiescent current.
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
MODE pin to V
the inductor is set to approximately 20% of the maximum
(BULK) VENDORS
VENDORS
V
(V)
2.7
2.7
2.7
2.7
3.3
3.3
2.7
2.7
3.3
3.3
2.7
2.7
3.3
3.3
5
5
5
5
5
5
5
5
5
5
5
5
IN
DROOP
(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
IN
VALUE
470µF, 4V
VALUE
100µF, 10V
. During this operation, the peak current of
DEVIATION (mV)
PEAK-TO- PEAK
135
100
40
60
60
50
40
41
60
60
64
50
42
50
60
50
80
50
70
50
70
20
40
65
65
87
RECOVERY
TIME (µs)
PART NUMBER
4TPE470M
PART NUMBER
10CE100FH
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
LTM4616
LOAD STEP
(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
11
(kΩ)
14.7
14.7
14.7
14.7
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
R
4616fc
10
10
10
10
FB