LINEAR TECHNOLOGY LTM4605 User Guide
Summary
The LTM4605 is a compact, high-efficiency Buck-Boost DC/DC µModule engineered for reliable power conversion in demanding applications. Delivering up to 98% efficiency with ultra-fast transient response, it features wide operating ranges (4.5V–20V input) and advanced protection circuits. The manual provides comprehensive technical specifications, pin diagrams, and performance data necessary for implementation. This component is ideal for engineers designing high-density power systems in telecom networking gear, industrial, military, and automotive equipment, especially those requiring small form factors.
Page 1 Text Content
LTM4605 High Effi ciency
Buck-Boost DC/DC µModule
FEATURES DESCRIPTION n Single Inductor Architecture Allows VIN Above, The LTM®4605 is a high effi ciency switching mode buck- Below or Equal to VOUT boost power supply. Included in the package are the n Wide VIN Range: 4.5V to 20V switching controller, power FETs, and support components. n Wide VOUT Range: 0.8V to 16V Operating over an input voltage range of 4.5V to 20V, the n 5A DC Typical (12A DC Typical at Buck Mode) LTM4605 supports an output voltage range of 0.8V to n High Effi ciency Up to 98% 16V, set by a resistor. This high effi ciency design delivers n Current Mode Control up to 5A continuous current in boost mode (12A in buck n Power Good Output Signal mode). Only the inductor, sense resistor, bulk input and n Phase-Lockable Fixed Frequency: 200k Hz to 400k Hz output capacitors are needed to fi nish the design. n Ultra-Fast Transient Response
The low profi le package enables utilization of unused space
n Current Foldback Protection
on the bottom of PC boards for high density point of load
n Output Overvoltage Protection
regulation. The high switching frequency and current
n Small, Low Profi le Surface Mount LGA Package
mode architecture enable a very fast transient response
(15mm × 15mm × 2.8mm)
to line and load changes. The LTM4605 can be frequency synchronized with an external clock to reduce undesirable
APPLICATIONS frequency harmonics.
FF IC IE
n Telecom, Servers and Networking Equipment Fault protection features include overvoltage and foldback n Industrial and Automotive Equipment current protection. The DC/DC μModule™ is offered in a n High Power Battery-Operated Devices small and thermally enhanced 15mm × 15mm × 2.8mm LGA
package. The LTM4605 is Pb-free and Ro HS compliant. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. μModule is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Effi ciency and Power Loss vs
12V/5A Buck-Boost DC/DC μModule with 4.5V to 20V Input Input Voltage VIN
CLOCK SYNC VOUT = 12V
4.5V TO 20V
10μF ILOAD = 5A
35V VIN PLLIN f = 200k Hz
VOUT 12V 10μF 330μF 5A
ON/OFF RUN LTM4605
4.7μH SW1 SW2
RSENSE SENSE+
SENSE–SS VFBSGND PGND
VIN (V)
4605 TA01b
4605 TA01
4605fa
Page Summary Contents For LINEAR TECHNOLOGY LTM4605 User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 286.47 KB |
| Published | June 21, 2026 |
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