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LTM4605
High Ef?ciency
Buck-Boost DC/DC
μModule Regulator
FEATURES
DESCRIPTION
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Single Inductor Architecture Allows V IN Above,
Below or Equal to V OUT
Wide V IN Range: 4.5V to 20V
Wide V OUT Range: 0.8V to 16V
5A DC Typical (12A DC Typical at Buck Mode)
High Ef?ciency 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 Pro?le Surface Mount LGA Package
(15mm × 15mm × 2.8mm)
The LTM ? 4605 is a high ef?ciency 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 20V, the
LTM4605 supports an output voltage range of 0.8V to
16V, set by a resistor. This high ef?ciency design delivers
up to 5A continuous current in boost mode (12A in buck
mode). Only the inductor, sense resistor, bulk input and
output capacitors are needed to ?nish the design.
The low pro?le 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. The LTM4605 can be frequency
APPLICATIONS
synchronized with an external clock to reduce undesirable
frequency harmonics.
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Telecom, Servers and Networking Equipment
Industrial and Automotive Equipment
High Power Battery-Operated Devices
Fault protection features include overvoltage and foldback
current protection. The DC/DC μModule ? regulator is of-
fered in a small and thermally enhanced 15mm × 15mm ×
L , LT, LTC, LTM, Linear Technology, the Linear logo, μModule ad 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
2.8mm LGA package. The LTM4605 is Pb-free and RoHS
compliant.
12V/5A Buck-Boost DC/DC μModule Regulator with 4.5V to 20V Input
Ef?ciency and Power Loss
PLLIN V
V IN
V IN
4.5V TO 20V
10μF
35V
ON/OFF
RUN
LTM4605
OUT
FCB
SW1
CLOCK SYNC
4.7μH
10μF
35V
+
330μF
25V
V OUT
12V
5A
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96
vs Input Voltage
V OUT = 12V
I LOAD = 5A
f = 200kHz
8
7
6
5
SW2
R SENSE
95
94
4
0.1μF
SS
SGND
PGND
SENSE +
SENSE –
V FB
6mΩ
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3
2
1
7.15k
90
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
0
4605 TA01
V IN (V)
4605 TA01b
4605fc
1
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