LTM4655
EN55022B Compliant 40V, Dual 4A or Single 8A Step-
Down or 50W Inverting µModule Regulator
FEATURES
DESCRIPTION
ꢂulꢆ 4AꢃSinꢈꢆe 8A Low EμI Switch μoꢅe Power Suꢁꢁꢆy
EN55011 Cꢆlss B Comꢁꢆilnt
Two Fuꢆꢆy Inꢅeꢁenꢅent Chlnneꢆs, Elch
Confiꢈurlbꢆe for Positive or Neꢈltive ꢀutꢁut
2oꢆtlꢈe Poꢆlrity
ꢀutꢁut 2oꢆtlꢈe ꢇlnꢈe: 0.52 ≤ |2
Wiꢅe Inꢁut 2oꢆtlꢈe ꢇlnꢈe: Uꢁ to 402
The LTM®4655 is an ultralow noise 40V, dual 4A or single
8A DC/DC μModule® regulator designed to meet the radi-
ated emissions requirements of EN55022. Its channels
are fully independent, parallelable and capable of deliver-
ing positive or negative output polarity. Conducted emis-
sion requirements can be met by adding standard filter
components. Included in the package are the switching
controllers, power MOSFETs, inductors, filters and sup-
port components. A 5V, 25mA LDO and clock generator
enable phase interleaving of the power switching stages,
for improved EMC performance.
n
n
n
+
–
n
n
– 2
| ≤ 16.52
ꢀUTn
ꢀUTn
n
3.±2 or 3.62 Stlrt-Uꢁ, Confiꢈurltion-ꢂeꢁenꢅent
±±.6ꢊ7 Totlꢆ ꢂC ꢀutꢁut 2oꢆtlꢈe Error ꢀver Line,
Lolꢅ lnꢅ Temꢁerlture
n
n
n
n
n
n
n
n
Anlꢆoꢈ ꢀutꢁut Current Inꢅicltor (Positive-2
Lꢂꢀ : 52 Fixeꢅ, 15mA Clꢁlbꢆe Lꢂꢀ
ꢀnꢆy)
ꢀUT
+
ꢀUT
The LTM4655 can regulate positive VOUTn voltages
Plrlꢆꢆeꢆlbꢆe with LTμ465±ꢃLTμ4653
between 0.5V and 26.5V from a 3.1V to 40V input. The
Constant-Frequency Current Mode Control
–
LTM4655 can regulate negative V
voltages between
OUTn
Power Good Indicators and Programmable Soft-Start
Overcurrent and Overtemperature Protection
16mm × 16mm × 5.01mm BGA Package
–0.5V and –26.5V from a maximum input range of 3.6V to
–
40V, with the span from V to V
not to exceed 40V. A
switching frequency range of 250OkUHTznto 3MHz is supported.
INn
APPLICATIONS
The LTM4655 is offered in a 16mm × 16mm × 5.01mm
BGA package with SnPb or RoHS compliant terminal finish.
n
Automated Test and Measurement
n
Avionics and Industrial Control Systems
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 5481178, 5705919, 5847554, 6580258.
n
Video, Imaging and Instrumentation
TYPICAL APPLICATION
Concurrent, ±±12 ꢀutꢁut ꢂCꢃꢂC ꢄμoꢅuꢆe ꢇeꢈuꢆltorꢉ
I
OUT1
V
IN
13V TO 28V
12V
OUT
UP TO 4A
+
V
V
OUT1
IN1
4.7μF
4.7μF
ꢀutꢁut 2oꢆtlꢈe Stlrt-Uꢁ Wlveforms
+
SV
V
V
OSNS1
IN1
22µF
×2
–
LOAD1
SV
OUT1
D1
–
Rꢈꢑꢊꢐꢀ
V
OUT1
ꢌꢆꢃꢄꢅꢆ
f
SET1
124k
IMON1a
IMON1b
CHANNEL 1 ANALOG OUTPUT
CURRENT INDICATOR
ꢋ
ꢆ
ꢇꢈꢉꢊ
V
V
= 0.25Ω • I
ꢌꢆꢃꢄꢅꢆ
IN2
IMON1
OUT1
4.7μF
SV
IN2
LDO
OUT
5V
OUT
ꢍ
ꢆ
LTM4655
ꢇꢈꢉꢀ
UP TO 25mA
V
f
D2
ꢌꢆꢃꢄꢅꢆ
4.7μF
+
V
124k
240k
OUT2
+
SET2
V
OSNS2
ꢎꢏꢇꢇꢄꢊꢐꢀ
ꢌꢆꢃꢄꢅꢆ
47µF
×2
–12V
LOAD2
ISET2a
ISET2b
–
ꢀꢁꢂꢂ ꢃꢄ0ꢅꢆ
V
OUT
UP TO 2.9A**
ꢀꢁꢂꢃꢄꢅꢆ
OUT2
I
OUT2
–
SV
OUT2
ISET1a
ISET1b
240k
GND
4655 TA01a
*FOR COMPLETE CIRCUIT, SEE FIGURE 50.
**FOR CHANNELS CONFIGURED TO REGULATE NEGATIVE V
−
:
CURRENT LIMIT FREQUENCY-FOLDBACK INCEPTION IS
OUT
n
A FUNCTION OF V , V
-, AND f
. CONTINUOUS OUTPUT CURRENT CAPABILITY IS SUBJECT TO DETAILS OF
OUT
INn
n
SWn
APPLICATION IMPLEMENTATION. SEE NOTES 2 AND 3 AND THE APPLICATIONS INFORMATION SECTION, FOR DETAILS.
Rev. 0
1
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