LTM4609
36VIN, 34VOUT High Efficiency
Buck-Boost DC/DC
µModule Regulator
Description
Features
Single Inductor Architecture Allows VIN Above,
Below or Equal to VOUT
n Wide V Range: 4.5V to 36V
IN
n Wide V
OUT Range: 0.8V to 34V
n I
OUT : 4A DC (10A DC in Buck Mode)
n Up to 98% Efficiency
n Current Mode Control
n Power Good Output Signal
n Phase-Lockable Fixed Frequency: 200kHz to 400kHz
n Ultrafast Transient Response
n Current Foldback Protection
n Output Overvoltage Protection
n Small Surface Mount Footprint, Low Profile
(15mm × 15mm × 2.82mm) LGA and
(15mm × 15mm × 3.42mm) BGA Packages
n SnPb (BGA) or RoHS Compliant (LGA and BGA)
Finish
The LTM®4609 is a high efficiency switching mode buckboost 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.
n
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 offered in small 15mm × 15mm × 2.82mm LGA and 15mm
× 15mm × 3.42mm BGA packages. The LTM4609 is available with SnPb (BGA) or RoHS compliant terminal finish.
Applications
Telecom, Servers and Networking Equipment
Industrial and Automotive Equipment
n High Power Battery-Operated Devices
n
n
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Typical Application
Efficiency and Power Loss
vs Input Voltage
30V/2A Buck-Boost DC/DC µModule Regulator with 6.5V to 36V Input
VIN
RUN
PLLIN V
OUT
FCB
LTM4609
10µF
50V
5.6µH
+
330µF
50V
VOUT
30V
2A
SW1
SW2
RSENSE
SENSE+
0.1µF
SS
SGND
SENSE–
PGND
R2
15mΩ
×2
VFB
98
4609 TA01a
5
97
4
96
95
3
94
2
93
92
91
2.74k
6
POWER LOSS (W)
ON/OFF
99
CLOCK SYNC
10µF
50V
EFFICIENCY (%)
VIN
6.5V TO 36V
EFFICIENCY
POWER LOSS
8
12
16
24
20
VIN (V)
28
32
36
1
0
4609 TA01b
4609ff
For more information www.linear.com/LTM4609
1