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LTM4607
36V IN , 24V OUT High Efficiency
Buck-Boost DC/DC
μModule Regulator
Single Inductor Architecture Allows V IN Above,
Wide V IN Range: 4.5V to 36V
Wide V OUT Range: 0.8V to 24V
5A DC (10A DC in Buck Mode)
High Efficiency Up to 98%
Current Mode Control
Power Good Output Signal
Phase-Lockable Fixed Frequency: 200kHz to 400kHz
Ultrafast Transient Response
Current Foldback Protection
Output Overvoltage Protection
Small, Low Profile Surface Mount LGA Package
Telecom, Servers and Networking Equipment
Industrial and Automotive Equipment
High Power Battery-Operated Devices
FEATURES
n
Below or Equal to V OUT
n
n
n
n
n
n
n
n
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(15mm × 15mm × 2.8mm)
APPLICATIONS
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L , LT, LTC, LTM, Linear Technology, the Linear logo, μModule and PolyPhase are registered
trademarks and No R SENSE is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
DESCRIPTION
The LTM ? 4607 is a high efficiency switching mode buck-
boost power supply. Included in the package are the
switching controller, power FETs, and support components.
Operating over an input voltage range of 4.5V to 36V, the
LTM4607 supports an output voltage range of 0.8V to
24V, set by a resistor. This high efficiency design delivers
up to 5A continuous current in boost mode (10A in buck
mode). Only the inductor, sense resistor, bulk input and
output capacitors are needed to finish the design.
The low profile package enables utilization of unused space
on the bottom of PC boards for high density point of load
regulation. The high switching frequency and current
mode architecture enable a very fast transient response
to line and load changes without sacrificing stability. The
LTM4607 can be frequency synchronized with an external
clock to reduce undesirable frequency harmonics.
Fault protection features include overvoltage and foldback
current protection. The DC/DC μModule ? regulator is
offered in a small thermally enhanced 15mm × 15mm ×
2.8mm LGA package. The LTM4607 is Pb-free and RoHS
compliant.
20V/2.5A Buck-Boost DC/DC μModule Regulator with 4.5V to 36V Input
Efficiency and Power Loss
vs Input Voltage
V IN
4.5V TO 36V
10μF
50V
ON/OFF
RUN
V IN PLLIN V OUT
FCB
LTM4607
SW1
CLOCK SYNC
4.7μH
10μF
35V
+
330μF
25V
V OUT
20V
2.5A
100
99
98
97
96
V OUT = 20V, 2.5A
? = 200kHz
6
5
4
SW2
95
3
0.1μF
SS
SGND
PGND
R SENSE
SENSE +
SENSE –
V FB
4607 TA01
R2
7m
4.12k
94
93
92
91
90
6
11
16
21
26
31
2
1
0
36
V IN (V)
4607 TA01b
1
For more information www.linear.com/LTM4607
4607fc
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