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PDF LTM4601HV Data sheet ( Hoja de datos )
| Número de pieza | LTM4601HV | |
| Descripción | DC/DC uModule Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM4601HV
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 Parallel Multiple µModule® Regulators for Current
Sharing
n Differential Remote Sensing for Precision Regulation
n PLL Frequency Synchronization
n ±1.5% Regulation
n Current Foldback Protection (Disabled at Start-Up)
n RoHS Compliant with Pb-Free Finish,
Gold Finish LGA (e4) or SAC 305 BGA (e1)
n Ultrafast Transient Response
n Current Mode Control
n Up to 95% Efficiency at 5VIN, 3.3VOUT
n Programmable Soft-Start
n Output Overvoltage Protection
n Small Footprint, Low Profile
(15mm × 15mm × 2.82mm) Surface Mount LGA and
(15mm × 15mm × 3.42mm) BGA Packages
APPLICATIONS
n Telecom and Networking Equipment
n Servers
n Industrial Equipment
n Point of Load Regulation
The LTM®4601HV is a complete 12A step-down switch
mode DC/DC power supply with onboard switching control-
ler, MOSFETs, inductor and all support components. The
µModule regulator is housed in small surface mount 15mm
× 15mm × 2.82mm LGA and 15mm × 15mm × 3.42mm
BGA packages. Operating over an input voltage range of
4.5V to 28V, the LTM4601HV supports an output voltage
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.
A high switching frequency and adaptive on-time current
mode architecture deliver a very fast transient response
to line and load changes without sacrificing stability. An
onboard differential remote sense amplifier can be used
to accurately regulate an output voltage independent of
load current.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered
trademarks and LTpowerCAD is a trademark 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
ON/OFF
R1
392k
VIN
PGOOD
PLLIN TRACK/SS
VOUT
VFB
RUN MARG0
COMP
INTVCC
LTM4601HV MARG1
VOUT_LCL
DRVCC
MPGM
DIFFVOUT
VOSNS+
VOSNS–
SGND PGND fSET
5% MARGIN
100pF
MARGIN
CONTROL
VOUT
2.5V
12A
COUT
RSET
19.1k
4601HV TA01a
Efficiency and Power Loss
vs Load Current
95
90 12VIN
85
80 24VIN
75 EFFICIENCY
6
5
4
70 3
65 24VIN
60
12VIN
2
55
POWER LOSS
1
50
45 0
0 2 4 6 8 10 12 14
LOAD CURRENT (A)
4601HV TA01b
4601hvfb
1
1 page  
LTM4601HV
TYPICAL PERFORMANCE CHARACTERISTICS (See Figures 19 and 20 for all curves)
Efficiency vs Load Current
with 5VIN
100
95
90
85
80
75
0.6VOUT
70 1.2VOUT
1.5VOUT
65 2.5VOUT
3.3VOUT
60
0 5 10
LOAD CURRENT (A)
15
4601HV G01
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
4601HV G02
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
4601HV G03
1.2V Transient Response
1.5V Transient Response
1.8V Transient Response
VOUT
50mV/DIV
0A TO 6A
LOAD STEP
VOUT
50mV/DIV
0A TO 6A
LOAD STEP
VOUT
50mV/DIV
0A TO 6A
LOAD STEP
20µs/DIV
1.2V AT 6A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4601HV G04
20µs/DIV
1.5V AT 6A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4601HV G05
20µs/DIV
1.8V AT 6A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4601HV G06
2.5V Transient Response
VOUT
50mV/DIV
0A TO 6A
LOAD STEP
20µs/DIV
2.5V AT 6A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4601HV G07
3.3V Transient Response
VOUT
50mV/DIV
0A TO 6A
LOAD STEP
20µs/DIV
3.3V AT 6A/µs LOAD STEP
COUT = 3 • 22µF 6.3V CERAMICS
470µF 4V SANYO POSCAP
C3 = 100pF
4601 G08
4601hvfb
5
5 Page 
LTM4601HV
APPLICATIONS INFORMATION
The typical LTM4601HV application circuits are shown in
Figures 19 and 20. External component selection is primar-
ily determined by the maximum load current and output
voltage. Refer to Table 2 for specific external capacitor
requirements for a particular application.
VIN to VOUT Step-Down Ratios
There are restrictions in the maximum VIN to VOUT step
down ratio that can be achieved for a given input voltage.
These constraints are shown in the Typical Performance
Characteristics curves labeled VIN to VOUT Step-Down
Ratio. Note that additional thermal derating may apply. See
the Thermal Considerations and Output Current Derating
section of this data sheet.
Output Voltage Programming and Margining
The PWM controller has an internal 0.6V reference voltage.
As shown in the Block Diagram, a 1M and a 60.4k 0.5%
internal feedback resistor connects VOUT and VFB pins
together. The VOUT_LCL pin is connected between the 1M
and the 60.4k resistor. The 1M resistor is used to protect
against an output overvoltage condition if the VOUT_LCL
pin is not connected to the output, or if the remote sense
amplifier output is not connected to VOUT_LCL. In these
cases, the output voltage will default to 0.6V. Adding a
resistor RSET from the VFB pin to SGND pin programs
the output voltage:
VOUT
=
0.6V
60.4k +RSET
RSET
or equivalently:
RSET
=
60.4k
VOUT
0.6V
−
1
Table 1. RSET Standard 1% Resistor Values vs VOUT
RSET
(kΩ)
Open
60.4
40.2
30.1
25.5
19.1
13.3
VOUT
(V)
0.6
1.2
1.5
1.8
2
2.5 3.3
8.25
5
The MPGM pin programs a current that when multiplied
by an internal 10k resistor sets up the 0.6V reference ±
offset for margining. A 1.18V reference divided by the
RPGM resistor on the MPGM pin programs the current.
Calculate VOUT(MARGIN):
VOUT(MARGIN)
=
%VOUT
100
• VOUT
where %VOUT is the percentage of VOUT you want to
margin, and VOUT(MARGIN) is the margin quantity in volts:
RPGM
=
VOUT
0.6V
•
1.18V
VOUT(MARGIN)
• 10k
where RPGM is the resistor value to place on the MPGM
pin to ground.
The margining voltage, VOUT(MARGIN), will be added or
subtracted from the nominal output voltage as determined
by the state of the MARG0 and MARG1 pins. See the truth
table below:
MARG1
LOW
LOW
HIGH
HIGH
MARG0
LOW
HIGH
LOW
HIGH
MODE
NO MARGIN
MARGIN UP
MARGIN DOWN
NO MARGIN
Input Capacitors
LTM4601HV module should be connected to a low AC
impedance DC source. Input capacitors are required to
be placed adjacent to the module. In Figure 20, the 10µF
ceramic input capacitors are selected for their ability to
handle the large RMS current into the converter. An input
bulk capacitor of 100µF is optional. This 100µF capacitor
is only needed if the input source impedance is compro-
mised by long inductive leads or traces.
For a buck converter, the switching duty-cycle can be
estimated as:
D=
VOUT
VIN
4601hvfb
11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTM4601HV.PDF ] | |
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