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PDF LTM4606 Data sheet ( Hoja de datos )
| Número de pieza | LTM4606 | |
| Descripción | 6A DC/DC uModule | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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www.DataSheet4U.com
LTM4606
Ultralow EMI 28VIN, 6A
DC/DC µModule
FEATURES
n Complete Low EMI Switch Mode Power Supply
n Wide Input Voltage Range: 4.5V to 28V
n 6A DC Typical, 8A Peak Output Current
n 0.6V to 5V Output Voltage Range
n Low Input and Output Referred Noise
n Output Voltage Tracking and Margining
n PLL Frequency Synchronization
n ±1.5% Total DC Error
n Power Good Output
n Current Foldback Protection (Disabled at Start-Up)
n Parallel/Current Sharing
n Ultrafast Transient Response
n Current Mode Control
n Up to 93% Efficiency at 5VIN, 3.3VOUT
n Programmable Soft-Start
n Output Overvoltage Protection
n –55°C to 125°C Operating Temperature Range
(LTM4606MPV)
n Small Surface Mount Footprint, Low Profile Package
(15mm × 15mm × 2.8mm)
APPLICATIONS
n ASICs or FPGA Transceivers
n Telecom, Servers and Networking Equipment
n Industrial Equipment
n Rf Equipment
DESCRIPTION
The LTM®4606 is a complete ultralow noise high voltage
6A switching mode DC/DC power supply. Included in the
package are the switching controller, power FETs, inductor,
and all support components. The on-board input filter and
noise cancellation circuits achieve low noise operation, thus
effectively reducing the electromagnetic interference (EMI).
Operating over an input voltage range of 4.5V to 28V, the
LTM4606 supports an output voltage range of 0.6V to 5V,
set by a single resistor. This high efficiency design deliv-
ers 6A continuous current (8A peak). Only bulk input and
output capacitors are needed to finish the design.
High switching frequency and an adaptive on-time current
mode architecture enables a very fast transient response
to line and load changes without sacrificing stability. The
device supports output voltage tracking and output volt-
age margining.
Furthermore, the μModule™ can be synchronized with an
external clock for reducing undesirable frequency harmonics
and allows PolyPhase® operation for high load currents.
The LTM4606 is offered in a space saving and thermally
enhanced 15mm × 15mm × 2.8mm LGA package, which
enables utilization of unused space on the bottom of
PC boards for high density point of load regulation. The
LTM4606 is Pb-free and RoHS compliant.
L, LT, LTC, LTM and PolyPhase 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.
TYPICAL APPLICATION
Ultralow Noise 2.5V/6A Power Supply with 4.5V to 28V Input
4.5V TO 28V
CLOCK SYNC
CIN
10μF
35V
CERAMIC
x2
ON/OFF
TRACK/SS
CONTROL
10μF
35V
VIN PLLIN
PGOOD
VOUT
RUN LTM4606
COMP
VFB
INTVCC
DRVCC
fSET
TRACK/SS
FCB
MARG0
MARG1
VD MPGM
SGND PGND
47pF
RFB
19.1k
MARGIN
CONTROL
392k
5% MARGIN
4606 TA01
2.5V AT 6A
COUT
Radiated Emission Scan at 12VIN,
2.5VOUT/6A
100
90
80
70
60
50 CISPR.22, CLASS B, 3 METERS
40
30
20
10
0
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
4606 TA01b
4606f
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TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current with
5VIN (FCB = 0)
100
90
80
70
60
50
0
0.6VOUT
1.2VOUT
1.8VOUT
2.5VOUT
3.3VOUT
123456
LOAD CURRENT (A)
4606 G01
Efficiency vs Load Current with
12VIN (FCB = 0)
100
90
80
70
1.2VOUT
60
1.5VOUT
2.5VOUT
3.3VOUT
5VOUT
50
0123456
LOAD CURRENT (A)
4606 G02
LTM4606
Efficiency vs Load Current with
24VIN (FCB = 0)
100
90
80
70
60
50
0
2.5VOUT
3.3VOUT
5VOUT
123456
LOAD CURRENT (A)
4606 G03
1.2V Transient Response
1.5V Transient Response
1.8V Transient Response
IOUT
2A/DIV
VOUT
50mV/DIV
50μs/DIV
1.2V AT 3.5A/μs LOAD STEP
COUT = 2x 22μF, 10V CERAMIC
1x 100μF, 6.3V CERAMIC
IOUT
2A/DIV
VOUT
50mV/DIV
4606 G04
50μs/DIV
1.5V AT 3.5A/μs LOAD STEP
COUT = 2x 22μF, 10V CERAMIC
1x 100μF, 6.3V CERAMIC
IOUT
2A/DIV
VOUT
50mV/DIV
4606 G05
50μs/DIV
1.8V AT 3.5A/μs LOAD STEP
COUT = 2x 22μF, 10V CERAMIC
1x 100μF, 6.3V CERAMIC
4606 G06
2.5V Transient Response
3.3V Transient Response
–55°C, Start-Up, IOUT = 0A
IOUT
2A/DIV
VOUT
50mV/DIV
50μs/DIV
2.5V AT 3.5A/μs LOAD STEP
COUT = 2x 22μF, 10V CERAMIC
1x 100μF, 6.3V CERAMIC
IOUT
2A/DIV
VOUT
100mV/DIV
4606 G07
50μs/DIV
3.3V AT 3.5A/μs LOAD STEP
COUT = 2x 22μF, 10V CERAMIC
1x 100μF, 6.3V CERAMIC
VOUT
0.5V/DIV
IIN
0.5A/DIV
4606 G08
VIN = 12V
1ms/DIV
VOUT = 1.5V
COUT = 2x 22μF, 10V CERAMIC
1x 100μF, 6.3V CERAMIC
SOFT-START = 3.9nF
4606 G16
4606f
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LTM4606
APPLICATIONS INFORMATION
directly adjacent to the module VD pins in the PCB layout
to minimize the trace inductance and high frequency AC
noise. Each 10μF ceramic is typically good for 2 to 3 amps
of RMS ripple current. Refer to your ceramics capacitor
catalog for the RMS current ratings.
To attenuate high frequency noise, extra input capacitors
should be connected to the VIN pads and placed before
the high frequency inductor to form the ∏ filter. One of
these low ESR ceramic capacitors is recommended to
be placed close to the connection into the system board.
A large bulk 100μF capacitor is only needed if the input
source impedance is compromised by long inductive
leads or traces. Figure 2 shows the conducted EMI
testing results to meet the level 5 of CISPR 25. For differ-
ent applications, input capacitance may be varied to meet
different conducted EMI limits.
80
70
60
50
CIS25QP
40
30
20
10
0
0.15
1 10 30
FREQUENCY (MHz)
4606 F02
Figure 2. Conducted Emission Scan with 12VIN to 2.5VOUT at 6A
(3× 10μF Ceramic Capacitors on VIN pads and 1× 10μF Ceramic
Capacitor on VD Pads)
Output Capacitors
The LTM4606 is designed for low output voltage ripples.
The bulk output capacitors defined as COUT are chosen
with low enough effective series resistance (ESR) to meet
the output voltage ripple and transient requirements. COUT
can be a low ESR tantalum capacitor, low ESR polymer
capacitor or 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
spike is required. Table 2 shows a matrix of different output
voltages and output capacitors to minimize the voltage
droop and overshoot during a 3A/μs transient. The table
optimizes total equivalent ESR and total bulk capacitance
to maximize transient performance.
Multiphase operation with multiple LTM4606 devices in
parallel will lower the effective output ripple current due
to the phase interleaving operation. Refer to Figure 3
for the normalized output ripple current versus the duty
cycle. Figure 3 provides a ratio of peak-to-peak output
ripple current to the inductor ripple current as functions
of duty cycle and the number of paralleled phases. Pick
the corresponding duty cycle and the number of phases
to get the correct output ripple current value. For example,
each phase’s inductor ripple current DIr at zero duty cycle
is ~2.5A for a 12V to 2.5V design. The duty cycle is about
0.21. The 2-phase curve has a ratio of ~0.58 for a duty
cycle of 0.21. This 0.58 ratio of output ripple current to
the inductor ripple current DIr at 2.5A equals ~1.5A of the
output ripple current (ΔIL).
The output voltage ripple has two components that are
related to the amount of bulk capacitance and effective
series resistance (ESR) of the output bulk capacitance.
The equation is:
ΔVOUT(P−P)
≈
⎛
⎝⎜
8
•
f
ΔIL
• N • COUT
⎞
⎠⎟
+
ESR
•
ΔIL
Where f is the frequency and N is the number of paral-
leled phases.
Fault Conditions: Current Limit and Overcurrent
Foldback
LTM4606 has a current mode controller, which inher-
ently limits the cycle-by-cycle inductor current not only
in steady-state operation, but also in transient.
To further limit current in the event of an overload condi-
tion, the LTM4606 provides foldback current limiting. If the
output voltage falls by more than 50%, then the maximum
output current is progressively lowered to about one sixth
of its full current limit value.
4606f
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTM4606.PDF ] | |
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