LTM4651
EN55022B Compliant 58V, 24W
Inverting-Output DC/DC μModule Regulator
FEATURES
DESCRIPTION
The LTM®4651 is an ultralow noise, 58V, 24W DC/DC
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Complete Low EMI Switch Mode Power Supply
EN55022 Class B Compliant
μModule® inverting topology regulator. It regulates a nega-
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–
Wide Input Voltage Range: 3.6V to 58V
tive output voltage (V
) from a positive input supply
OUT
Up to 4A Output Current
voltage(V ),andisdesignedtomeettheradiatedemissions
IN
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24W Output from 12V to –24V , P
A
= 5W,
requirements of EN55022. Conducted emission require-
ments can be met by adding standard filter components.
Included in the package are the switching controller, power
MOSFETs, inductor, filters and support components.
IN
OUT LOSS
T = 60°C, t
= 60°C, 200LFM
RISE
–
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Output Voltage Range: –26.5V ≤ V
≤ –0.5V
OUT
–
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Safe Operating Area: V + |V
| ≤ 58V
IN
OUT
1.6ꢀ7 Total DC Output Voltage Error Over Line,
Load and Temperature (–40°C to 125°C)
–
The LTM4651 can regulate V
to a value between
OUT
–0.5V and –26.5V, provided that its input and output
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Parallel and Current Share with Multiple LTM4651s
Constant-Frequency Current Mode Control
Frequency Synchronization Range: 250kHz to 3MHz
Power Good Indicator and Programmable Soft-Start
Overcurrent/Overvoltage/Overtemperature Protection
15mm × 9mm × 5.01mm BGA Package
voltages adhere to the safe operating area criteria of the
–
LTM4651: V + |V
| ≤ 58V. A switching frequency
IN
OUT
range of 250kHz to 3MHz is supported (400kHz default)
and the module can synchronize to an external clock.
Despite being an inverting topology regulator, no level shift
circuitry is needed to interface to the LTM4651’s RUN,
PGOOD or CLKIN pins; those pins are referenced to GND.
APPLICATIONS
TheLTM4651isofferedina15mm×9mm×5.01mmBGA
package with SnPb or RoHS compliant terminal finish.
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Avionics, Industrial Control and Test Equipment
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Video, Imaging and Instrumentation
All registered trademarks and trademarks are the property of their respective owners.
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48V Telecom and Network Power Supplies
RF Systems
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TYPICAL APPLICATION
–24V, 2.25A* Ultralow Noise** DC/DC μModule Regulator
Output Current Capability*
ꢀ.ꢁ
V
IN
V
PGND
IN
3.6V
ꢀ.ꢁ
4.7μF
TO 34V
SV
GND
IN
SNS
10µF
×2
ꢀ.ꢁ
LOAD
V
D
–
ꢀ.ꢁ
RUN
INTV
SV
V
OUT
4.7μF
–
–24V
UP TO 2.25A
,
ꢢ
OUT
CC
ꢀ.ꢁ
ꢀ.ꢁ
ꢀ.ꢁ
ꢀ.ꢁ
ꢀ
ꢟ
ꢟ
ꢟ
ꢟ
ꢟ
ꢟ
ꢟ
ꢟ
ꢣ ꢢꢤ.ꢥꢟ
ꢣ ꢢꢞ.ꢞꢟ
ꢣ ꢢꢥꢟ
OUT
ꢠꢡꢚ
ꢠꢡꢚ
ꢠꢡꢚ
ꢠꢡꢚ
ꢠꢡꢚ
ꢠꢡꢚ
ꢠꢡꢚ
ꢠꢡꢚ
LTM4651
ꢢ
ꢢ
ꢢ
ꢢ
ꢢ
ꢢ
ꢢ
VINREG
COMPa
COMPb
ꢣ ꢢꢦꢟ
ꢣ ꢢꢛꢝꢟ
ꢣ ꢢꢛꢥꢟ
ꢣ ꢢꢝꢤꢟ
ꢣ ꢢꢝꢧꢟ
PINS NOT USED IN
THIS CIRCUIT:
f
SET
CLKIN, PGOOD,
PGDFB, SW, EXTV
GND
ISETa ISETb
ꢀ
ꢀꢁ
ꢀꢁ
ꢀꢁ
ꢀꢁ
ꢀꢁ
ꢀꢁ
CC
4651 TA01a
+
–
ꢀꢁꢂꢃꢄ ꢅꢆꢇꢄAꢈꢉ ꢊꢅꢋ
TEMP , TEMP , NC
90.9k
ꢀꢁꢂꢃ ꢄAꢅꢃꢆ
481k
ꢀꢁꢂꢃꢃeꢄꢅ ꢆꢇꢈꢇꢅ ꢉꢃeꢊꢂeꢄꢋꢌꢍꢉꢎꢆꢏꢐꢑꢋꢒ ꢑꢋꢅꢇvꢑꢅeꢓ ꢑꢅ ꢆꢎꢑꢏ ꢋꢂꢃꢃeꢄꢅꢓ ꢔꢇꢕꢔeꢃ ꢅꢔꢑꢄ ꢇꢄꢏꢇꢋꢑꢅeꢏ
ꢋꢂꢃveꢓ. ꢁꢎꢄꢅꢇꢄꢂꢎꢂꢓ ꢎꢂꢅꢖꢂꢅ ꢋꢂꢃꢃeꢄꢅ ꢋꢑꢖꢑꢐꢇꢆꢇꢅꢌ ꢓꢂꢐꢗeꢋꢅ ꢅꢎ ꢏeꢅꢑꢇꢆꢓ ꢎꢉ ꢑꢖꢖꢆꢇꢋꢑꢅꢇꢎꢄ
ꢇꢈꢖꢆeꢈeꢄꢅꢑꢅꢇꢎꢄ. ꢘꢙꢇꢅꢋꢔꢇꢄꢕ ꢉꢃeꢊꢂeꢄꢋꢌ ꢓeꢅ ꢖeꢃ ꢚꢑꢐꢆe ꢛ. ꢘee ꢜꢎꢅeꢓ ꢝ ꢑꢄꢏ ꢞ.
**See Figures 5 – 8 for DC2328A Radiated Emission Performance against EN55022B limits.
Rev. A
1
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