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LTM4613
Complete Low EMI Switch Mode Power Supply
EN55022 Class B Compliant
Wide Input Voltage Range: 5V to 36V
8A Output Current
3.3V to 15V Output Voltage Range
Low Input and Output Referred Noise
Output Voltage Tracking and Margining
PLL Frequency Synchronization
2% Maximum Total DC Error
Power Good Tracks with Margining
Current Foldback Protection
Parallel/Current Sharing
Ultrafast Transient Response
Current Mode Control
Programmable Soft-Start
Output Overvoltage Protection
–55°C to 125°C Operating Temperature Range
Small Surface Mount Footprint, Low Profile
Telecom and Networking Equipment
Industrial and Avionic Equipment
RF Systems
FEATURES
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(LTM4613MPV)
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(15mm × 15mm × 4.32mm) LGA Package
APPLICATIONS
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TYPICAL APPLICATION
12V/8A Ultralow Noise μModule with 24V to 36V Input
EN55022B Compliant
36V IN , 15V OUT , 8A,
DC/DC μModule Regulator
DESCRIPTION
The LTM ? 4613 is a complete, ultralow noise, 8A switch
mode DC/DC power supply. Included in the package are the
switching controller, power FETs, inductor and all support
components. Operating over an input voltage range of 5V
to 36V, the LTM4613 supports an output voltage range of
3.3V to 15V, set by a single external resistor. 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 onboard input filter and noise cancellation circuits
achieve low noise coupling, thus effectively reducing
the electromagnetic interference (EMI)—see Figure 7.
Furthermore, the DC/DC μModule ? regulator can be syn-
chronized with an external clock to reduce undesirable
frequency harmonics and allow PolyPhase ? operation for
high load currents.
The LTM4613 is offered in a space saving and thermally
enhanced 15mm × 15mm × 4.32mm LGA package, which
enables utilization of unused space on the bottom of PC
boards for high density point-of-load regulation. The
LTM4613 is Pb-free and RoHS compliant.
L , LT, LTC, LTM, μModule, PolyPhase, Linear Technology, and the Linear logo are registered
trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Radiated Emission Scan with 24V IN to 12V OUT at 8A
70
MARG1
V IN
24V
TO 36V
C IN
0.1μF
51k
10μF
× 3
CLOCK SYNC
V IN PLLIN
PGOOD V OUT
RUN LTM4613
COMP V FB
INTV CC
DRV CC FCB
f SET MARG0
TRACK/SS
V D MPGM
SGND PGND
MARGIN
CONTROL
392k
5% MARGIN
4613 TA01
22pF
5.23k
V OUT
12V
8A
C OUT
60
50
40
30
20
10
0
–10
30
226.2
EN55022B LIMIT
422.4 613.6
FREQUENCY (MHz)
814.3 1010.0
4613 TA01b
4613f
1
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