LTM4613_15 Datasheet, PDF (1/28 Pages) Linear Technology – EN55022B Compliant 36VIN, 15VOUT, 8A, DC/DC Module Regulator

FEATURES
n _{Complete Low EMI Switch Mode Power Supply}
n _{EN55022 Class B Compliant}
n _{Wide Input Voltage Range: 5V to 36V}
n _{8A Output Current}
n _{3.3V to 15V Output Voltage Range}
n _{Low Input and Output Referred Noise}
n _{Output Voltage Tracking and Margining}
n _{PLL Frequency Synchronization}
n _{2% Maximum Total DC Error}
n _{Power Good Tracks with Margining}
n _{Current Foldback Protection}
n _{Parallel/Current Sharing}
n _{Ultrafast Transient Response}
n _{Current Mode Control}
n _{Programmable Soft-Start}
n _{Output Overvoltage Protection}
n _{–55°C to 125°C Operating Temperature Range}
(LTM4613MPV)
n _{Small Surface Mount Footprint, Low Profile}
(15mm × 15mm × 4.32mm) LGA Package
APPLICATIONS
n _{Telecom and Networking Equipment}
n _{Industrial and Avionic Equipment}
n _{RF Systems}
LTM4613
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.
TYPICAL APPLICATION
V_IN
24V
TO 36V
12V/8A Ultralow Noise µModule with 24V to 36V Input
CLOCK SYNC
C_IN
0.1µF
51k
10µF
×3
V_IN PLLIN
PGOOD
V_OUT
RUN LTM4613
COMP
INTV_CC
DRV_CC
f_SET
TRACK/SS
V_D
V_FB
FCB
MARG0
MARG1
MPGM
SGND PGND
22pF
5.23k
MARGIN
CONTROL
392k
5% MARGIN
4613 TA01
V_OUT
12V
8A
C_OUT
Radiated Emission Scan with 24V_IN to 12V_OUT at 8A
70
60
50
40
EN55022B LIMIT
30
20
10
0
–10
30
226.2 422.4 613.6 814.3 1010.0
FREQUENCY (MHz)
4613 TA01b
4613f
1