LTM4607 Datasheet, PDF (1/24 Pages) Linear Technology – 36VIN, 24VOUT High Effi ciency Buck-Boost DC/DC μModule

LTM4607
36V_IN, 24V_OUT High Efficiency
Buck-Boost DC/DC µModule
FEATURES
■ _{Single Inductor Architecture Allows VIN Above,}
Below or Equal to V_OUT
■ _{Wide VIN Range: 4.5V to 36V}
■ _{Wide VOUT Range: 0.8V to 24V}
■ _{5A DC (10A DC in Buck Mode)}
■ _{High Efficiency Up to 98%}
■ _{Current Mode Control}
■ _{Power Good Output Signal}
■ _{Phase-Lockable Fixed Frequency: 200kHz to 400kHz}
■ _{Ultra-Fast Transient Response}
■ _{Current Foldback Protection}
■ _{Output Overvoltage Protection}
■ _{Small, Low Profile Surface Mount LGA Package}
(15mm × 15mm × 2.8mm)
APPLICATIONS
■ _{Telecom, Servers and Networking Equipment}
■ _{Industrial and Automotive Equipment}
■ _{High Power Battery-Operated Devices}
DESCRIPTION
The LTM^®4607 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
LTM4607 supports an output voltage range of 0.8V to
24V, set by a resistor. This high efficiency design delivers
up to 5A 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
LTM4607 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™ is offered in a
small thermally enhanced 15mm × 15mm × 2.8mm LGA
package. The LTM4607 is Pb-free and RoHS compliant.
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. μModule is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
20V/2.5A Buck-Boost DC/DC μModule with 4.5V to 36V Input
V_IN
4.5V TO 36V
10μF
50V
ON/OFF
0.1μF
CLOCK SYNC
V_IN PLLIN _VOUT
FCB
RUN LTM4607
SW1
SW2
R_SENSE
SENSE⁺
SS
SGND
SENSE^–
PGND
V_FB
4.7μH
R2
7mΩ
4.12k
10μF ⁺
35V
330μF
25V
V_OUT
20V
2.5A
4607 TA01
Efficiency and Power Loss vs
Input Voltage
100
6
99
98
5
97
4
96
95
3
94
2
93
92
1
91
V_OUT = 20V, 2.5A
f = 200kHz
90
0
6 11 16 21 26 31 36
V_IN (V)
4607 TA01b
4607f
1