LTM4612 Datasheet, PDF (1/24 Pages) Linear Technology – Ultralow Noise 36VIN, 15VOUT, 5A, DC/DC μModule

FEATURES
n _{Complete Low EMI Switch Mode Power Supply}
n _{CISPR 22 Class B Compliant}
n _{Wide Input Voltage Range: 5V to 36V}
n _{5A DC, 7A Peak 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 _{±1.5% Set Point Accuracy}
n _{Power Good Tracks with Margining}
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
Ultralow Noise
36V_IN, 15V_OUT, 5A,
DC/DC µModule
DESCRIPTION
The LTM^®4612 is a complete, ultralow noise, 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^TM can be synchronized
with an external clock for reducing undesirable frequency
harmonics and allows 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.
, 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
V_IN
22V
TO 36V
12V/5A Ultralow Noise μModule with 22V to 36V Input
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
5.23k
MARGIN
CONTROL
392k
5% MARGIN
4612 TA01
V_OUT
12V
5A
C_OUT
Efficiency vs Load Current at 12V Output
100
95
90
85
80
75
70
65
60
55
50
0
24V_IN 12V_OUT
28V_IN 12V_OUT
36V_IN 12V_OUT
1
2
3
4
5
OUTPUT CURRENT (A)
4612 TA01b
4612f
1