LTM4612_1 Datasheet, PDF (1/28 Pages) Linear Technology – EN55022B Compliant 36VIN, 15VOUT, 5A, 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 _{3.3V to 15V Output Voltage Range}
n _{5A DC, 7A Peak Output Current}
n _{Low Input and Output Referred Noise}
n _{Output Voltage Tracking and Margining}
n _{Power Good Tracks with Margining}
n _{PLL Frequency Synchronization}
n _{±1.5% Set Point Accuracy}
n _{Current Foldback Protection (Disabled at Start-Up)}
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}
(LTM4612MPV)
n _{Small Surface Mount Footprint, Low Profile}
(15mm × 15mm × 2.8mm) LGA Package
Applications
n _{Telecom and Networking Equipment}
n _{Industrial and Avionic Equipment}
n _{RF Systems}
LTM4612
EN55022B Compliant
36V_IN, 15V_OUT, 5A,
DC/DC µModule Regulator
Description
The LTM^®4612 is a EN55022 Class B certified high voltage
input and output, 5A switching 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 LTM4612
supports an output voltage range of 3.3V to 15V, set by a
single 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 Figures 4 and 8.
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 LTM4612 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
LTM4612 is Pb-free and RoHS compliant.
L, LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase and µModule are registered
trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Typical Application
5V/5A Ultralow Noise µModule with 7V to 36V Input
V_IN
7V
TO 36V
CLOCK SYNC
2M
C_IN
0.01µF
100k
10µF
V_IN PLLIN
PGOOD
V_OUT
RUN LTM4612
COMP
INTV_CC
DRV_CC
f_SET
TRACK/SS
V_D
V_FB
FCB
MARG0
MARG1
MPGM
SGND PGND
100pF
13.7k
MARGIN
CONTROL
392k
5% MARGIN
4612 TA01
V_OUT
5V
5A
C_OUT
Radiated Emission Scan at 24V_IN, 5V_OUT/5A
70
60
50
40
EN55022 CLASS B LIMIT
30
20
10
0
–10
30 226.2 422.4 618.6 814.8 1010
128.1 324.3 520.5 716.7 912.9
FREQUENCY (MHz)
4612 TA01b
4612fb
1