ltm4608a Linear Technology Corporation, ltm4608a Datasheet - Page 12

• Manufacturer Part Number: ltm4608a
• Description: Low Vin, 8a Dc/dc ?module With Tracking, Margining, And Frequency Synchronization
• Manufacturer: Linear Technology Corporation

be used. Forced continuous operation can be enabled by
tying the MODE pin to GND. In this mode, inductor cur-
rent is allowed to reverse during low output loads, the I
voltage is in control of the current comparator threshold
throughout, and the top MOSFET always turns on with each
oscillator pulse. During start-up, forced continuous mode is
disabled and inductor current is prevented from reversing
until the LTM4608A’s output voltage is in regulation.
LTM4608A
APPLICATIONS INFORMATION
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
12
V
OUT1
(V)
1.0
1.0
1.0
1.0
1.0
1.0
1.2
1.2
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
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
100μF
100μF
100μF
100μF
C
IN
IN
(CERAMIC)
has very low input impedance.
100μF × 2
100μF × 2
100μF × 2
100μF × 2
100μF × 2
100μF × 2
100μF × 2
100μF × 2
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
22μF × 1
22μF × 1
22μF × 1
C
OUT1
PART NUMBER
C3216X7S0J226M
GRM31CR61C226KE15L
C4532X5R0J107MZ
GRM32ER60J107M
150μF × 2
150μF × 2
150μF × 2
150μF × 2
150μF × 2
150μF × 2
150μF × 2
150μF × 2
150μF × 2
150μF × 2
150μF × 2
150μF × 2
150μF × 1
150μF × 1
150μF × 1
(BULK)
C
OUT2
100pF
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
I
TH
100pF
100pF
100pF
100pF
100pF
100pF
120pF
120pF
100pF
100pF
None
None
None
None
None
None
None
None
None
None
None
None
68pF
68pF
68pF
47pF
47pF
22pF
22pF
22pF
C1
TH
100pF
100pF
100pF
100pF
100pF
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
47pF
47pF
47pF
47pF
C3
C
Sanyo POSCAP
C
Sanyo
OUT2
IN
Multiphase Operation
For output loads that demand more than 8A of current,
multiple LTM4608As can be cascaded to run out of phase
to provide more output current without increasing input
and output voltage ripples. The CLKIN pin allows the
LTM4608A to synchronize to an external clock (between
0.75MHz and 2.25MHz) and the internal phase locked
(BULK) VENDORS VALUE
VENDORS
V
(V)
3.3
3.3
2.5
2.5
3.3
3.3
2.5
2.5
3.3
3.3
2.5
2.5
3.3
3.3
2.5
2.5
3.3
3.3
5
5
5
5
5
5
5
5
5
5
5
5
IN
DROOP
(mV)
13
17
13
17
13
17
16
20
16
20
16
16
18
20
16
20
18
20
22
21
21
21
22
21
28
33
30
21
38
39
VALUE
150μF, 10V
100μF, 10V
DEVIATION (mV)
PEAK-TO- PEAK
26
34
26
34
26
34
32
41
32
41
32
32
36
41
32
41
36
41
42
42
43
41
44
42
42
60
60
41
74
75
RECOVERY
TIME (μs)
PART NUMBER
10TPD150M
PART NUMBER
10CE100FH
10
10
10
10
12
10
12
10
12
12
12
12
12
14
10
10
10
10
10
12
7
8
7
7
8
8
8
8
8
8
LOAD STEP
(A/μs)
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
(kΩ)
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
14.7
14.7
14.7
14.7
14.7
14.7
R
4608af
10
10
10
10
10
10
FB