New Products Catalog - Linear Technology - #19

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^Module Regulators
^J^^ß TECHNOLOGY
LTM4609
36VIN, 34VOUT High Efficiency Buck-Boost DC/DC uModule Regulator
FEATURES
Single Inductor Architecture Allows VIN Above,
Below or Equal to VOUT
Wide VIN Range: 4.5V to 36V
Wide VOUT Range: 0.8V to 34V
IOUT: 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, Low Profile Surface Mount LGA Package
(15mm x 15mm x 2.8mm)
APPLICATIONS
Telecom, Servers and Networking Equipment Industrial and Automotive Equipment High Power Battery-Operated Devices
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 uModule® regulator is offered in a small thermally enhanced 15mm x 15mm x 2.8mm LGA package. The LTM4609 is Pb-free and RoHS compliant.
30V/2A Buck-Boost DC/DC uModule Regulator with 5V to 36V Input
H_L"
— CLOCK SYNC
6.5V TO 36V
10uF 50V
vout
m m-30V
vin PLLIN Vout FCB
_L_
.10uF -U_330liF ■50V 50V
2A
-1
5.6uH -
L___j
ON/OFF ■
RUN LTM4609
SW1 SW2 rsense
I SENSE+
0.1UF
I—j j- SS SENSE-
TOP VIEW
BANK 2
;r2
•15mfi I x2
BANK 4
BANK 1
SGND
PGND vfb -1 —
~j~ ^ 2.74k
BANK 3
Efficiency and Power Loss vs Input Voltage
BANK 5
99 98 97
£ 96
s*
___
\ \
\
\ \
-
s
>
f
4
L
r
-
— efficiet
— power
jcy loss
BANK 6
ZD JJ
JJ
I—
o en en
lga package
141-LEAD (15mm x 15mm x 2.8mm] LTM4609EV LTM4609IV
8 12 16 20 24 28 32 36
(V) 4609 TA01B

pageCatalog pdf di En 2012-05-22-30