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PDF LTM4616 Data sheet ( Hoja de datos )
| Número de pieza | LTM4616 | |
| Descripción | Dual 8A per Channel Low VIN DC/DC uModule | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM4616 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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FEATURES
■ Complete Dual DC/DC Regulator System
■ Input Voltage Range: 2.7V to 5.5V
■ Dual 8A Outputs, or Single 16A Output with a 0.6V
to 5V Range
■ Output Voltage Tracking and Margining
■ ±1.75% Total DC Output Error (–40°C to 125°C)
■ Current Mode Control/Fast Transient Response
■ Power-Good Tracking and Margining
■ Overcurrent/Thermal Shutdown Protection
■ Onboard Frequency Synchronization
■ Spread Spectrum Frequency Modulation
■ Multiphase Operation
■ Selectable Burst Mode® Operation
■ Output Overvoltage Protection
■ Gold-Pad Finish Allows Soldering with Pb and Pb-
Free Solder Paste
■ Small Surface Mount Footprint, Low Profile
(15mm × 15mm × 2.82mm) LGA Package
APPLICATIONS
■ Telecom, Networking and Industrial Equipment
■ Storage and ATCA, PCI Express Cards
■ Battery Operated Equipment
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
μModule is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 5481178, 6580258, 6304066,
6127815, 6498466, 6611131, 6724174.
LTM4616
Dual 8A per Channel Low
VIN DC/DC µModule
DESCRIPTION
The LTM®4616 is a complete dual 2-phase 8A per channel
switch mode DC/DC power regulator system in a 15mm ×
15mm surface mount LGA package. Included in the package
are the switching controller, power FETs, inductor and all
support components. Operating from an input voltage
range of 2.7V to 5.5V, the LTM4616 supports two outputs
within a voltage range of 0.6V to 5V, each set by a single
external resistor. This high efficiency design delivers up
to 8A continuous current (10A peak) for each output. Only
bulk input and output capacitors are needed, depending
on ripple requirement. The part can also be configured for
a 2-phase single output at up to 16A.
The low profile package (2.82mm) enables utilization
of unused space on the back side of PC boards for high
density point-of-load regulation.
Fault protection features include overvoltage protection,
overcurrent protection and thermal shutdown. The power
module is offered in a space saving and thermally enhanced
15mm × 15mm × 2.82mm LGA package. The LTM4616 is
Pb-free and RoHS compliant.
Different Combinations of Input and Output
Number of Inputs
Number of Outputs
22
21
12
11
IOUT (MAX)
8A, 8A
16A
8A, 8A
16A
TYPICAL APPLICATION
Dual Output DC/DC μModule™ Regulator
VIN1 5V
10μF
VIN2 3.3V TO 5V
10μF
VIN1 VOUT1
FB1
LTM4616
ITHM1
VIN2 VOUT2
FB2
GND1
ITHM2
GND2
2.21k
3.09k
VOUT1
3.3V/8A
100μF
VOUT2
2.5V/8A
100μF
4616 TA01a
Efficiency vs Load Current
95
5VIN 3.3VOUT
90
5VIN 2.5VOUT
85
80
75
70
0
246
LOAD CURRENT (A)
8
4616 TA01b
4616fa
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LTM4616
TYPICAL PERFORMANCE CHARACTERISTICS Specified as Each Channel
Burst Mode Efficiency with
5V Input
100
90
80
70
60
50 VOUT = 1.5V
VOUT = 2.5V
VOUT = 3.3V
40
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
LOAD CURRENT (A)
4616 G04
VIN to VOUT Step-Down Ratio
4.0
IOUT = 8A
3.5 VOUT = 1.2V
VOUT = 1.5V
3.0 VOUT = 1.8V
VOUT = 2.5V
2.5 VOUT = 3.3V
2.0
1.5
1.0
0.5
0
0123456
VIN (V)
4616 G05
VIN to VOUT Step-Down Ratio
4.0
IOUT = 5A
3.5 VOUT = 1.2V
VOUT = 1.5V
3.0 VOUT = 1.8V
VOUT = 2.5V
2.5 VOUT = 3.3V
2.0
1.5
1.0
0.5
0
0123456
VIN (V)
4616 G06
Supply Current vs VIN
1.6
Load Transient Response
1.4
1.2
1
0.8
0.6
0.4
0.2
0
2.5
VO = 1.2V PULSE-SKIPPING MODE
VO = 1.2V BURST MODE
ILOAD
1A/DIV
VOUT
50mV/DIV
3 3.5 4 4.5
INPUT VOLTAGE (V)
5 5.5
4616 G07
VIN = 5V
VOUT = 3.3V
2A/μs STEP
20μs/DIV
4616 G08
COUT = 2 × 100μF X5R, 470μF 4V POSCAP
Load Transient Response
ILOAD
1A/DIV
VOUT
50mV/DIV
VIN = 5V
VOUT = 2.5V
2A/μs STEP
20μs/DIV
4616 G09
COUT = 2 × 100μF X5R, 470μF 4V POSCAP
Load Transient Response
Load Transient Response
Load Transient Response
ILOAD
1A/DIV
VOUT
50mV/DIV
ILOAD
1A/DIV
VOUT
50mV/DIV
ILOAD
1A/DIV
VOUT
50mV/DIV
VIN = 5V
VOUT = 1.8V
2.5A/μs STEP
20μs/DIV
4616 G10
COUT = 2 × 100μF X5R, 470μF 4V POSCAP
VIN = 5V
VOUT = 1.5V
2.5A/μs STEP
20μs/DIV
4616 G11
COUT = 2 × 100μF X5R, 470μF 4V POSCAP
VIN = 5V
VOUT = 1.2V
2.5A/μs STEP
20μs/DIV
COUT = 2 × 100μF X5R, 470μF POSCAP
4616 G12
4616fa
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LTM4616
APPLICATIONS INFORMATION
Table 3. Output Voltage Response Versus Component Matrix (Refer to Figure 18) 0A to 3A Load Step
TYPICAL MEASURED VALUES
COUT1 VENDORS
TDK
VALUE
22μF, 6.3V
PART NUMBER
C3216X7S0J226M
COUT2 VENDORS
Sanyo POSCAP
VALUE
470μF, 4V
Murata
TDK
22μF, 16V
100μF, 6.3V
GRM31CR61C226KE15L
C4532X5R0J107MZ
CIN (BULK) VENDORS VALUE
Sanyo
100μF, 10V
Murata
100μF, 6.3V
GRM32ER60J107M
PART NUMBER
4TPE470M
PART NUMBER
10CE100FH
VOUT
CIN
(V) (CERAMIC)
1.0 10μF
CIN
(BULK)*
100μF
COUT1
(CERAMIC)
100μF × 2
COUT2
(BULK)
470μF
ITH
None
1.0 10μF
100μF 100μF × 2
None
1.0 10μF
100μF 100μF × 2
None
1.0 10μF
100μF 22μF × 1 470μF None
1.2 10μF
100μF 100μF × 2
None
1.2 10μF
100μF 22μF × 1 470μF None
1.2 10μF
100μF 100μF × 2
None
1.2 10μF
100μF 22μF × 1 470μF None
1.5 10μF
100μF 100μF × 2
None
1.5 10μF
100μF 22μF × 1 470μF None
1.5 10μF
100μF 100μF × 1
None
1.5 10μF
100μF 22μF × 1 470μF None
1.5 10μF
100μF 100μF × 2
None
1.5 10μF
100μF 22μF × 1 470μF None
1.8 10μF
100μF 100μF × 1
None
1.8 10μF
100μF 22μF × 1 470μF None
1.8 10μF
100μF 100μF × 2
None
1.8 10μF
100μF 22μF × 1 470μF None
1.8 10μF
100μF 100μF × 2
None
1.8 10μF
100μF 22μF × 1 470μF None
2.5 10μF
100μF 100μF × 1
None
2.5 10μF
100μF 22μF × 1 470μF None
2.5 10μF
100μF 100μF × 1
None
2.5 10μF
100μF 22μF × 1 470μF None
3.3 10μF
100μF 100μF × 1
None
3.3 10μF
100μF 22μF × 1 470μF None
*Bulk capacitance is optional if VIN has very low input impedance.
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
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
VIN DROOP PEAK-TO- PEAK RECOVERY LOAD STEP RFB
(V) (mV) DEVIATION (mV) TIME (μs)
(A/μs) (kΩ)
5 20
40
40 2.5 14.7
5 30
60
25 2.5 14.7
2.7 30
60
25 2.5 14.7
2.7 25
50
25 2.5 14.7
5 20
40
25 2.5 10
5 20
41
25 2.5 10
2.7 30
60
20 2.5 10
2.7 30
60
25 2.5 10
5 32
64
20 2.5 6.65
5 25
50
25 2.5 6.65
3.3 22
42
25 2.5 6.65
3.3 25
50
25 2.5 6.65
2.7 30
60
25 2.5 6.65
2.7 25
50
25 2.5 6.65
5 42
80
25 2.5 4.87
5 25
50
30 2.5 4.87
3.3 35
70
30 2.5 4.87
3.3 25
50
30 2.5 4.87
2.7 35
70
30 2.5 4.87
2.7 35
20
30 2.5 4.87
5 35
40
30 2.5 3.09
5 32
65
40 2.5 3.09
3.3 50
100
30 2.5 3.09
3.3 32
65
40 2.5 3.09
5 65
135
30 2.5 2.21
5 40
87
40 2.5 2.21
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. The Linear
Technology μModule Power Design Tool will calculate the
output ripple reduction as the phase number increases
by N times.
Burst Mode Operation
The LTM4616 is capable of Burst Mode operation on
each regulator in which the power MOSFETs operate
intermittently 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 VIN. During this operation, the peak
current of the inductor is set to approximately 20% of
4616fa
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTM4616.PDF ] | |
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