LTM4609

1

4609fa

FEATURES

APPLICATIONS

DESCRIPTION

Buck-Boost DC/DC µModule

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

small thermally enhanced 15mm

× 15mm × 2.8mm LGA

package. The LTM4609 is Pb-free and RoHS compliant.

30V/2A Buck-Boost DC/DC μModule with 5V to 36V Input

(15mm

× 15mm × 2.8mm)

Efficiency and Power Loss

vs Input Voltage

TYPICAL APPLICATION

FCB

RUN

SW1

SW2

SS

SGND

PLLIN

LTM4609

5.6μH

2.74k

10μF

50V

330μF

50V

4609 TA01a

30V

2A

CLOCK SYNC

PGND

6.5V TO 36V

0.1μF

10μF

50V

+

ON/OFF

R2

15mΩ

2

8

99

98

97

96

95

94

93

91

92

6

5

4

3

2

1

0

20

32

4609 TA01b

12

16

24

28

36

EFFICIENCY

POWER LOSS

L, LT, LTC, LTM, Linear Technology, the Linear logo and μModule are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective owners.