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PDF LTM4601AHV Data sheet ( Hoja de datos )
| Número de pieza | LTM4601AHV | |
| Descripción | DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM4601AHV
12A, 28VIN DC/DC µModule
Regulator with PLL, Output
Tracking and Margining
Features
Description
n Complete Switch Mode Power Supply
n Wide Input Voltage Range: 4.5V to 28V
n 12A DC Typical, 14A Peak Output Current
n 0.6V to 5V Output Voltage
n Output Voltage Tracking and Margining
n Redundant Mounting Pads for Enhanced
Solder-Joint Strength
n Parallel Multiple µModule® Regulators for
Current Sharing
n Differential Remote Sensing for Precision Regulation
n PLL Frequency Synchronization
n ±1.5% Total DC Error
n Current Foldback Protection (Disabled at Start-Up)
n SnPb or RoHS Compliant Finish
n –55°C to 125°C Operating Temperature Range
(LTM4601AHVMPV)
n Ultrafast™ Transient Response
n Up to 95% Efficiency at 5VIN, 3.3VOUT
n Programmable Soft-Start
n Output Overvoltage Protection
n Enhanced (15mm × 15mm × 2.82mm) Surface Mount
LGA and (15mm × 15mm × 3.42mm) BGA Packages
Applications
The LTM®4601AHV is a complete 12A step-down switch
mode DC/DC power supply with onboard switching con-
troller, MOSFETs, inductor and all support components.
The µModule regulator is housed in a small surface mount
15mm × 15mm × 2.82mm LGA or 15mm × 15mm ×
3.42mm BGA package. The LTM4601AHV LGA and BGA
packages are designed with redundant mounting pads to
enhance solder-joint strength for extended temperature
cycling endurance. Operating over an input voltage range
of 4.5V to 28V, the LTM4601AHV supports an output volt-
age range of 0.6V to 5V as well as output voltage tracking
and margining. The high efficiency design delivers 12A
continuous current (14A peak). Only bulk input and output
capacitors are needed to complete the design.
The low profile and light weight package easily mounts
in unused space on the back side of PC boards for high
density point of load regulation. The µModule regulator
can be synchronized with an external clock for reducing
undesirable frequency harmonics and allows PolyPhase®
operation for high load currents.
An onboard differential remote sense amplifier can be used
to accurately regulate an output voltage independent of
load current. The LTM4601AHV is available with SnPb or
RoHS compliant terminal finish.
n Telecom, Industrial and Networking Equipment
n Military and Avionics Systems
L, LT, LTC and LTM, Linear Technology, the Linear logo, µModule and PolyPhase are
registered trademarks and Ultrafast and LTpowerCAD are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.
Patents including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, 6677210.
Typical Application
2.5V/12A Power Supply with 4.5V to 28V Input
VIN
4.5V TO 28V
CIN
CLOCK SYNC
TRACK/SS CONTROL
VIN
PGOOD
PLLIN TRACK/SS
VOUT
ON/OFF
R1
392k
VFB
RUN MARG0
COMP LTM4601AHV MARG1
INTVCC
VOUT_LCL
DRVCC
MPGM
DIFFVOUT
VOSNS+
VOSNS–
SGND PGND fSET
5% MARGIN
100pF
MARGIN
CONTROL
VOUT
2.5V
12A
COUT
RSET
19.1k
4601AHV TA01a
Efficiency and Power Loss
vs Load Current
95
90 EFFICIENCY 12VIN
85
80 24VIN
75 POWER LOSS
70
65 24VIN
60 12VIN
6
5
4
3
2
55 1
50
45 0
0 2 4 6 8 10 12 14
LOAD CURRENT (A)
4601AHV TA01b
For more information www.linear.com/LTM4601AHV
4601ahvfc
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1 page  
LTM4601AHV
Typical Performance Characteristics (See Figures 19 and 20 for all curves)
Efficiency vs Load Current
with 5VIN
100
95
90
85
80
75
70
65
60
0
0.6VOUT
1.2VOUT
1.5VOUT
2.5VOUT
3.3VOUT
5 10
LOAD CURRENT (A)
15
4601AHV G01
1.2V Transient Response
Efficiency vs Load Current
with 12VIN
100
95
90
85
80
75
70
65
60
55
50
0
0.6VOUT
1.2VOUT
1.5VOUT
2.5VOUT
3.3VOUT
5VOUT
5 10
LOAD CURRENT (A)
15
4601AHV G02
1.5V Transient Response
Efficiency vs Load Current
with 24VIN
95
90
85
80
75
70
65
60
55
50
45
0
5 10
LOAD CURRENT (A)
1.5VOUT
2.5VOUT
3.3VOUT
5.0VOUT
15
4601AHV G03
1.8V Transient Response
VOUT
50mV/DIV
IOUT
5A/DIV
VOUT
50mV/DIV
IOUT
5A/DIV
VOUT
50mV/DIV
IOUT
5A/DIV
20µs/DIV
1.2V AT 6A/µs LOAD STEP
COUT = 3× 22µF 6.3V CERAMICS,
470µF 4V SANYO POSCAP
C3 = 100pF
4601AHV G04
20µs/DIV
1.5V AT 6A/µs LOAD STEP
COUT = 3× 22µF 6.3V CERAMICS,
470µF 4V SANYO POSCAP
C3 = 100pF
4601AHV G05
20µs/DIV
1.8V AT 6A/µs LOAD STEP
COUT = 3× 22µF 6.3V CERAMICS,
470µF 4V SANYO POSCAP
C3 = 100pF
4601AHV G06
2.5V Transient Response
3.3V Transient Response
VOUT
50mV/DIV
IOUT
5A/DIV
VOUT
50mV/DIV
IOUT
5A/DIV
20µs/DIV
2.5V AT 6A/µs LOAD STEP
COUT = 3× 22µF 6.3V CERAMICS,
470µF 4V SANYO POSCAP
C3 = 100pF
4601AHV G07
20µs/DIV
3.3V AT 6A/µs LOAD STEP
COUT = 3× 22µF 6.3V CERAMICS,
470µF 4V SANYO POSCAP
C3 = 100pF
4601AHV G08
VFB vs Temperature
0.606
0.604
0.602
0.600
0.598
0.596
0.594
–55
–25 5 35 65
TEMPERATURE (°C)
95 125
4601AHV G15
For more information www.linear.com/LTM4601AHV
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LTM4601AHV
Applications Information
For a buck converter, the switching duty cycle can be
estimated as:
D
=
VOUT
VIN
Without considering the inductor ripple current, the RMS
current of the input capacitor can be estimated as:
ICIN(RMS)
=
IOUT(MAX )
η%
•
D • (1– D)
In the above equation, η% is the estimated efficiency of
the power module. CIN can be a switcher-rated electrolytic
aluminum capacitor, OS-CON capacitor or high value ce-
ramic capacitor. Note the capacitor ripple current ratings
are often based on temperature and hours of life. This
makes it advisable to properly derate the input capacitor,
or choose a capacitor rated at a higher temperature than
required. Always contact the capacitor manufacturer for
derating requirements.
In Figures 19 and 20, the 10µF ceramic capacitors are to-
gether used as a high frequency input decoupling capacitor.
In a typical 12A output application, three very low ESR,
X5R or X7R 10µF ceramic capacitors are recommended.
These decoupling capacitors should be placed directly
adjacent to the module input pins in the PCB layout to
minimize the trace inductance and high frequency AC
noise. Each 10µF ceramic is typically good for 2A to 3A
of RMS ripple current. Refer to your ceramics capacitor
catalog for the RMS current ratings.
Multiphase operation with multiple LTM4601AHV devices
in parallel will lower the effective input RMS ripple cur-
rent due to the interleaving operation of the regulators.
Application Note 77 provides a detailed explanation. Refer
to Figure 2 for the input capacitor ripple current reduction
as a function of the number of phases. The figure provides
a ratio of RMS ripple current to DC load current as func-
tion of duty cycle and the number of paralleled phases.
Pick the corresponding duty cycle and the number of phases
to arrive at the correct ripple current value. For example,
the 2-phase parallel LTM4601AHV design provides 24A
at 2.5V output from a 12V input. The duty cycle is DC =
2.5V/12V = 0.21. The 2-phase curve has a ratio of ~0.25
for a duty cycle of 0.21. This 0.25 ratio of RMS ripple cur-
rent to a DC load current of 24A equals ~6A of input RMS
ripple current for the external input capacitors.
Output Capacitors
The LTM4601AHV is designed for low output ripple voltage.
The bulk output capacitors defined as COUT are chosen
with low enough effective series resistance (ESR) to meet
the output ripple voltage and transient requirements. COUT
can be a low ESR tantalum capacitor, a low ESR polymer
capacitor or a ceramic capacitor. The typical capacitance is
200µF if all ceramic output capacitors are used. Additional
output filtering may be required by the system designer
if further reduction of output ripple or dynamic transient
spikes is required. Table 2 shows a matrix of different
output voltages and output capacitors to minimize the
voltage droop and overshoot during a 5A/µs transient.
The table optimizes total equivalent ESR and total bulk
capacitance to maximize transient performance.
0.6
0.5
1-PHASE
0.4
2-PHASE
3-PHASE
4-PHASE
0.3
6-PHASE
12-PHASE
0.2
0.1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
DUTY CYCLE (VOUT/VIN)
4601AHV F02
Figure 2. Normalized Input RMS Ripple Current
vs Duty Cycle for One to Six Modules (Phases)
For more information www.linear.com/LTM4601AHV
4601ahvfc
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| PDF Descargar | [ Datasheet LTM4601AHV.PDF ] | |
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