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LTM4609
Single Inductor Architecture Allows V IN Above,
Wide V IN Range: 4.5V to 36V
Wide V OUT Range: 0.8V to 34V
I OUT : 4A DC (10A DC in Buck Mode)
Up to 98% Efficiency
Current Mode Control
Power Good Output Signal
Phase-Lockable Fixed Frequency: 200kHz to 400kHz
Ultrafast Transient Response
Current Foldback Protection
Output Overvoltage Protection
Small Surface Mount Footprint, Low Profile
SnPb (BGA) or RoHS Compliant (LGA and BGA)
Telecom, Servers and Networking Equipment
Industrial and Automotive Equipment
High Power Battery-Operated Devices
FEATURES
n
Below or Equal to V OUT
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n
n
n
n
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n
n
n
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(15mm × 15mm × 2.82mm) LGA and
(15mm × 15mm × 3.42mm) BGA Packages
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Finish
APPLICATIONS
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TYPICAL APPLICATION
36V IN , 34V OUT High Efficiency
Buck-Boost DC/DC
μModule Regulator
DESCRIPTION
The LTM ? 4609 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
LTM4609 supports an output voltage range of 0.8V to
34V, set by a resistor. This high efficiency design delivers
up to 4A 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
LTM4609 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 of-
fered in small 15mm × 15mm × 2.82mm LGA and 15mm
× 15mm × 3.42mm BGA packages. The LTM4609 is avail-
able with SnPb (BGA) or RoHS compliant terminal finish.
L , LT, LTC, LTM, Linear Technology, the Linear logo, μModule, Burst Mode 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.
30V/2A Buck-Boost DC/DC μModule Regulator with 6.5V to 36V Input
Efficiency and Power Loss
vs Input Voltage
V IN
6.5V TO 36V
10μF
50V
ON/OFF
RUN
V IN PLLIN V OUT
FCB
LTM4609
SW1
CLOCK SYNC
5.6μH
10μF
50V
+
330μF
50V
V OUT
30V
2A
99
98
97
96
6
5
4
SW2
95
3
0.1μF
SS
SGND
PGND
R SENSE
SENSE +
SENSE –
V FB
R2
15m
× 2
2.74k
94
93
92
91
8
12
16
20
24
EFFICIENCY
POWER LOSS
28 32 36
2
1
0
4609 TA01a
V IN (V)
4609 TA01b
4609ff
For more information www.linear.com/LTM4609
1
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