LTM4660
60V, 300W Hybrid Step-Down
µModule Bus Converter
FEATURES
DESCRIPTION
The LTM®4660 is a complete 300W output switching
mode hybrid-topology step-down DC/DC µModule®
(micromodule) nonisolated bus converter. Its exposed
power inductor resides on the top of the package, pro-
viding an intrinsic path for heat to dissipate up and out
of the module—away from one’s printed circuit board.
Included in the package are the switching controller IC,
power MOSFETs and supporting components. Only flying
(charge-pump) capacitors, bulk input and output bypass
capacitors, and a few configuration passives are needed.
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Input Voltage Range: 30V to 60V (65V Abs. Max.)
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Wide Output Voltage: 4.5V to 18V (V
< V /2)
OUT
IN
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97.3% Peak Efficiency (12V
at 15A, 48V )
OUT
IN
1.5% Maxiꢀuꢀ Total DC Output Error
Up to 300W Output Power
Scalable: Parallel LTM4660s for Higher Power
Fixed Frequency Current Mode Control
Phase-Lockable External Synchronization from
200kHz to 1MHz
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Low Start-Up Inrush Current with Flying Capacitor
Voltage-Balancing Prior to DC/DC Switching Action
Output Voltage Tracking with Soft-Start
Short-Circuit Protection with Adjustable Retry-Timer
Overcurrent and Overtemperature Protection
Onboard Diode Temperature Monitor
Optional External Reference Input
The LTM4660 features frequency synchronization,
Burst Mode® operation and output voltage soft-start and
tracking. An onboard temperature diode is available for
temperature monitoring. The LTM4660 protects against
short-circuit, overcurrent, and overtemperature faults. For
higher power applications, multiple LTM4660 modules
can be easily paralleled.
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Power Good and FAULT Indicators
16mm × 16mm × 10.34mm BGA Package
The LTM4660 is offered in a 16mm × 16mm × 10.34mm
BGA package with RoHS compliant terminal finish.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. patents, including 9484799.
APPLICATIONS
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Telecom, Data Centers and Networking Equipment
Industrial and Test Equipment
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TYPICAL APPLICATION
12V, 25A DC/DC μModule Nonisolated Bus Converter
Efficiency vs Load Current
VOUT = 12V
V
IN
30V TO 60V
RUN
INTV
V
IN
C
10µF
×2
98
97
96
95
94
IN
f
= 350kHz
V
SW
CC
INSNS
EXT_REF
10k
10k
LTM4660
+
C
FAULT
FAULT
C
FLY
10µF
50V
×12
PGOOD
PGOOD
–
HYS_PRGM
TIMER
C
100k
MID
SNS
C
1µF
COMPa
MID
MID
10µF
50V
×12
COMPb
FREQ
V
V
= 48V
= 54V
TRACK/SS
IN
IN
49.9k
EXTV
CC
V
12V
25A
OUT
V
FB
0.1µF
V
OUT
0
5
10
15
20
25
C
22µF
×2
+
MODE/PLLIN
TEMP
4.32k
OUT
C
OUT
150µF
LOAD CURRENT (A)
4660 TA01b
SGND
PGND
4660 TA01a
–
+
PINS NOT USED IN THIS CIRCUIT: CLKOUT, TEMP , TEMP
Rev. 0
1
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