LTM4653
EN55022B Compliant 58V, 4A
Step-Down DC/DC μModule Regulator
FEATURES
DESCRIPTION
The LTM®4653 is an ultralow noise 58V, 4A DC/DC step-
down μModule® regulator designed to meet the radiated
emissions requirements of EN55022. Conducted emis-
sion requirements can be met by adding standard filter
components. Included in the package are the switching
controller, power MOSFETs, inductor, filters and support
components.
n
Complete Low EMI Switch Mode Power Supply
EN55022 Class B Compliant
Wide Input Voltage Range: 3.1V to 58V
Up to 4A Output Current
Output Voltage Range: 0.5V ≤ V
n
n
n
n
n
≤ 0.94 • V
OUT
IN
1.ꢀ67 Total DC Output Voltage Error Over Line,
Load and Temperature (–40°C to 125°C)
Parallel and Current Share with Multiple LTM4ꢀ53s
Analog Output Current Indicator
n
n
n
n
n
n
n
Operating over an input voltage range of 3.1V to 58V, the
LTM4653 supports an output voltage range of 0.5V to
Programmable Input Voltage Limiting
94% of V , and a switching frequency range of 250kHz
IN
Constant-Frequency Current Mode Control
Power Good Indicator and Programmable Soft-Start
Overcurrent/Overvoltage/Overtemperature Protection
15mm × 9mm × 5.01mm BGA Package
to 3MHz (400kHz default), each set by a single resistor.
For high load currents, the LTM4653 can be paralleled in
PolyPhase® operation and synchronized to an external
clock. Only the bulk input and output filter capacitors are
needed to finish the design.
APPLICATIONS
The LTM4653 is offered in a 15mm × 9mm × 5.01mm
BGApackagewithSnPborRoHScompliantterminalfinish.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 5481178, 5705919, 5847554, 6580258.
n
Avionics, Industrial Control and Test Equipment
n
Video, Imaging and Instrumentation
n
48V Telecom and Network Power Supplies
RF Systems
n
TYPICAL APPLICATION
4A, 24V Output Low EMI DC/DC μModule Regulator
with Analog Output Current Indicator
Radiated Emission Scan in a 10m Chamber
LTM4ꢀ53 Delivering 24VOUT at 3.5A, from 48VIN
I
ꢓ0
OUT
V
24V
,
IN
ꢁꢈꢀꢨ ꢇꢄꢨꢅ ꢗ0ꢏ
ꢨꢂꢈꢜ ꢇꢄꢨꢅ ꢗ0ꢏ
OUT
V
V
OUT
IN
28V TO 58V
UP TO 4A
10µF
×2
ꢒ0
ꢑ0
ꢔ0
ꢕ0
ꢖ0
ꢗ0
0
4.7μF
4.7μF
V
OSNS
SV
IN
LOAD
V
D
SGND
PGND
RUN
INTV
CC
LTM4653
VINREG
COMPa
ANALOG OUTPUT
ꢣꢗꢤ ꢞꢥRꢄꢦꢥꢛꢅꢀꢃ
ꢣꢖꢤ ꢍꢈRꢅꢄꢜꢀꢃ
ꢚꢂꢧ ꢃꢄꢁꢄꢅ
IMONa
IMONb
CURRENT INDICATOR
10nF
V
= 0.25Ω • I
IMON
OUT
ꢩ
499Ω
ꢙꢥRꢁꢀꢃ
f
ꢘꢗ0
SET
PINS NOT USED IN
THIS CIRCUIT:
ꢕ0
ꢗꢕ0
ꢖꢕ0
ꢕꢕ0
ꢔꢕ0
ꢑꢕ0
ꢒꢕ0
ꢓꢕ0
ꢠꢕ0
ꢡꢕ0 ꢗ000
124k
GND
ISETa ISETb
ꢔꢒꢑꢕ ꢅꢀ0ꢗꢢ
ꢙRꢈꢚꢆꢈꢛꢜꢝ ꢉꢁꢞꢟꢐ
CLKIN, PGOOD, COMPb
PGDFB, SW, EXTV
4653 TA01a
CC
+
–
TEMP , TEMP , NC
481k
Rev 0
1
Document Feedback
For more information www.analog.com