Specification	LMS3655MMRNLR

Current - Output	5.5 A
Frequency - Switching [Max]	500 kHz
Frequency - Switching [Min]	250 kHz
Function	Step-Down
Mounting Type	Wettable Flank, Surface Mount
Number of Outputs	1
Operating Temperature [Max]	125 °C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package / Case	22-PowerVFQFN
Supplier Device Package	22-VQFN-HR
Supplier Device Package [x]	5
Supplier Device Package [y]	4
Synchronous Rectifier	False
Topology	Buck
Voltage - Input (Max) [Max]	36 V
Voltage - Input (Min) [Min]	3.5 V
Voltage - Output (Min/Fixed)	1 V

LMS3655-Q1 Series

5.5-A, 36-V synchronous, 400-kHz, step-down converter

Part	Current - Output	Function	Mounting Type	Voltage - Input (Min) [Min]	Topology	Frequency - Switching [Max]	Frequency - Switching [Min]	Package / Case	Grade	Voltage - Output (Min/Fixed)	Voltage - Input (Max) [Max]	Supplier Device Package [x]	Supplier Device Package [y]	Supplier Device Package	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Output Type	Qualification	Number of Outputs	Frequency - Switching	Voltage - Output (Max) [Max]	Main Purpose	Supplied Contents	Board Type	Voltage - Input [Min]	Voltage - Input [Max]	Utilized IC / Part	Outputs and Type	Outputs and Type	Voltage - Output	Regulator Topology	Output Type
Texas Instruments LMS3655AQRNLTQ1	5.5 A	Step-Down	Surface Mount Wettable Flank	3.9 V	Buck	500 kHz	250 kHz	22-PowerVFQFN	Automotive	1 V	36 V	5	4	22-VQFN-HR	Positive	-40 °C	125 °C	Adjustable	AEC-Q100	1
Texas Instruments LMS3655MQURNLRQ1	5.5 A	Step-Down	Surface Mount Wettable Flank	3.9 V	Buck			22-PowerVFQFN	Automotive	1 V	36 V	5	4	22-VQFN-HR	Positive	-40 °C	150 °C	Adjustable	AEC-Q100	1	400 kHz	20 V
Texas Instruments LMS3655NQEVM	5.5 A																				400 kHz		DC/DC Step Down	Board(s)	Fully Populated	3.5 V	36 V	LMS3655-Q1	Non-Isolated	1	3.3 V	Buck
Texas Instruments LMS3655NQRNLTQ1	5.5 A	Step-Down	Surface Mount Wettable Flank	3.9 V	Buck	500 kHz	250 kHz	22-PowerVFQFN	Automotive	3.3 V	36 V	5	4	22-VQFN-HR	Positive	-40 °C	125 °C		AEC-Q100	1													1.81 mOhm
Texas Instruments LMS3655AQRNLRQ1	5.5 A	Step-Down	Surface Mount Wettable Flank	3.9 V	Buck	500 kHz	250 kHz	22-VFQFN	Automotive	1 V	36 V	5	4	22-VQFN-HR	Positive	-40 °C	125 °C	Adjustable	AEC-Q100	1
Texas Instruments LMS3655AMRNLT	5.5 A	Step-Down	Surface Mount Wettable Flank	3.5 V	Buck	500 kHz	250 kHz	22-PowerVFQFN		1 V	36 V	5	4	22-VQFN-HR	Positive	-40 °C	125 °C	Adjustable		1
Texas Instruments LMS3655MQRNLTQ1	5.5 A	Step-Down	Surface Mount Wettable Flank	3.9 V	Buck	500 kHz	250 kHz	22-PowerVFQFN	Automotive	1 V	36 V	5	4	22-VQFN-HR	Positive	-40 °C	125 °C	Adjustable	AEC-Q100	1
Texas Instruments LMS3655MMRNLR	5.5 A	Step-Down	Surface Mount Wettable Flank	3.5 V	Buck	500 kHz	250 kHz	22-PowerVFQFN		1 V	36 V	5	4	22-VQFN-HR	Positive	-40 °C	125 °C	Adjustable		1
Texas Instruments LMS3655MQRNLRQ1	5.5 A	Step-Down	Surface Mount Wettable Flank	3.9 V	Buck	500 kHz	250 kHz	22-PowerVFQFN	Automotive	1 V	36 V	5	4	22-VQFN-HR	Positive	-40 °C	125 °C	Adjustable	AEC-Q100	1
Texas Instruments LMS36553QRNLTQ1	5.5 A	Step-Down	Surface Mount Wettable Flank	3.9 V	Buck	500 kHz	250 kHz	22-PowerVFQFN	Automotive	3.3 V	36 V	5	4	22-VQFN-HR	Positive	-40 °C	125 °C		AEC-Q100	1													1.81 mOhm

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tape & Reel (TR)	3000	$ 3.10
Texas Instruments	LARGE T&R	1	$ 4.25
		100	$ 3.46
		250	$ 2.72
		1000	$ 2.31

Description

General part information

LMS3655-Q1 Series

The LMS3635-Q1 and LMS3655-Q1 synchronous buck regulators are optimized for high performance applications, providing an output voltage of 3.3 V, 5 V, or an adjustable output of 1 V to 20 V. Seamless transition between PWM and PFM modes, along with a low quiescent current, ensures high efficiency and superior transient responses at all loads.

Advanced high-speed circuitry allows the LMS3655-Q1 to regulate an input of 24 V to an output of 3.3 V at a fixed frequency of 400 kHz while also enabling a continuous load current of 5.5 A. An innovative frequency foldback architecture allows this device to regulate a 3.3-V output from an input voltage of only 3.5 V. The input voltage can range up to 36 V, with transient tolerance up to 42 V, easing input surge protection design.

An open-drain reset output, with built-in filtering and delay, provides a true indication of system status. This feature negates the requirement for an additional supervisory component, saving cost and board space.

Documents

Technical documentation and resources

Powering up the performance of sensitive test and measurement systems

Technical article

LMS36x5-Q1 EVM User's Guide (Rev. A)

EVM User's guide

LMS3655 5.5-A, 36-V Synchronous, 400-kHz DC-DC Step-Down Converter datasheet (Rev. B)

Data sheet

Buck Converter Quick Reference Guide (Rev. B)

Selection guide

Designing High Performance, Low-EMI, Automotive Power Supplies

Application note