LTM4609_15 Datasheet, PDF (1/28 Pages) Linear Technology – 36VIN, 34VOUT High Efficiency Buck-Boost DC/DC Module Regulator

LTM4609
36V_IN, 34V_OUT High Efficiency
Buck-Boost DC/DC
µModule Regulator
Features
Description
n _{Single Inductor Architecture Allows VIN Above,}
Below or Equal to V_OUT
n _{Wide VIN Range: 4.5V to 36V}
n _{Wide VOUT Range: 0.8V to 34V}
n _{IOUT: 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
Applications
n _{Telecom, Servers and Networking Equipment}
n _{Industrial and Automotive Equipment}
n _{High Power Battery-Operated Devices}
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.
Typical Application
30V/2A Buck-Boost DC/DC µModule Regulator with 6.5V to 36V Input
V_IN
6.5V TO 36V
10µF
50V
ON/OFF
0.1µF
CLOCK SYNC
V_IN PLLIN _VOUT
FCB
RUN LTM4609
SW1
SW2
R_SENSE
SENSE⁺
SS
SGND
SENSE^–
PGND
V_FB
5.6µH
R2
15mΩ
×2
2.74k
10µF ⁺
50V
330µF
50V
V_OUT
30V
2A
4609 TA01a
For more information www.linear.com/LTM4609
Efficiency and Power Loss
vs Input Voltage
99
6
98
5
97
4
96
95
3
94
2
93
1
92
EFFICIENCY
POWER LOSS
91
0
8 12 16 20 24 28 32 36
V_IN (V)
4609 TA01b
4609ff
1