LMS3635-Q1 Series

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

Catalog

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

Part	Current - Output	Operating Temperature [Min]	Operating Temperature [Max]	Mounting Type	Grade	Output Configuration	Topology	Function	Voltage - Input (Max) [Max]	Output Type	Number of Outputs	Voltage - Output (Min/Fixed)	Package / Case	Qualification	Voltage - Input (Min) [Min]	Frequency - Switching [Max]	Frequency - Switching [Min]	Supplier Device Package [x]	Supplier Device Package [y]	Supplier Device Package	Output Type	Frequency - Switching	Main Purpose	Regulator Topology	Board Type	Outputs and Type	Outputs and Type	Supplied Contents	Voltage - Output	Utilized IC / Part	Voltage - Input [Min]	Voltage - Input [Max]	Voltage - Output (Max) [Max]
Texas Instruments LMS3635MQRNLTQ1	3.5 A	-40 °C	125 °C	Surface Mount Wettable Flank	Automotive	Positive	Buck	Step-Down	36 V	Adjustable	1	1 V	22-PowerVFQFN	AEC-Q100	3.9 V	500 kHz	250 kHz	5	4	22-VQFN-HR
Texas Instruments LMS3635LQRNLRQ1	3.5 A	-40 °C	125 °C	Surface Mount Wettable Flank	Automotive	Positive	Buck	Step-Down	36 V		1	5 V	22-PowerVFQFN	AEC-Q100	3.9 V	500 kHz	250 kHz	5	4	22-VQFN-HR	1.81 mOhm
Texas Instruments LMS3635LQURNLRQ1	3.5 A	-40 °C	150 °C	Surface Mount Wettable Flank	Automotive	Positive	Buck	Step-Down	36 V		1	5 V	22-PowerVFQFN	AEC-Q100	3.9 V			5	4	22-VQFN-HR	1.81 mOhm	2.1 MHz
Texas Instruments LMS3635NQRNLTQ1	3.5 A	-40 °C	125 °C	Surface Mount Wettable Flank	Automotive	Positive	Buck	Step-Down	36 V		1	3.3 V	22-PowerVFQFN	AEC-Q100	3.9 V	500 kHz	250 kHz	5	4	22-VQFN-HR	1.81 mOhm
Texas Instruments LMS3635NQRNLRQ1	3.5 A	-40 °C	125 °C	Surface Mount Wettable Flank	Automotive	Positive	Buck	Step-Down	36 V		1	3.3 V	22-PowerVFQFN	AEC-Q100	3.9 V	500 kHz	250 kHz	5	4	22-VQFN-HR	1.81 mOhm
Texas Instruments LMS36353QRNLRQ1	3.5 A	-40 °C	125 °C	Surface Mount Wettable Flank	Automotive	Positive	Buck	Step-Down	36 V		1	3.3 V	22-PowerVFQFN	AEC-Q100	3.9 V	500 kHz	250 kHz	5	4	22-VQFN-HR	1.81 mOhm
Texas Instruments LMS36355QRNLRQ1	3.5 A	-40 °C	125 °C	Surface Mount Wettable Flank	Automotive	Positive	Buck	Step-Down	36 V		1	5 V	22-PowerVFQFN	AEC-Q100	3.9 V	500 kHz	250 kHz	5	4	22-VQFN-HR	1.81 mOhm
Texas Instruments LMS3635MQEVM	3.5 A																					400 kHz	DC/DC Step Down	Buck	Fully Populated	Non-Isolated	1	Board(s)	5 V	LMS3635-Q1	3.5 V	36 V
Texas Instruments LMS3635LQRNLTQ1	3.5 A	-40 °C	125 °C	Surface Mount Wettable Flank	Automotive	Positive	Buck	Step-Down	36 V		1	5 V	22-PowerVFQFN	AEC-Q100	3.9 V	500 kHz	250 kHz	5	4	22-VQFN-HR	1.81 mOhm
Texas Instruments LMS3635MQURNLRQ1	3.5 A	-40 °C	150 °C	Surface Mount Wettable Flank	Automotive	Positive	Buck	Step-Down	36 V	Adjustable	1	3.3 V	22-PowerVFQFN	AEC-Q100	3.9 V			5	4	22-VQFN-HR		2.1 MHz											10 V

Catalog

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

Key Features

• AEC-Q100-qualified for automotive applicationsDevice temperature grade 1: –40°C to +125°C ambient operating temperatureDevice HBM classification level 2Device CDM classification level C696% Peak efficiency while converting 12 V to 5 VLow EMI and minimized switch node ringing400-kHz (±10%) fixed switching frequency–40°C to +150°C junction temperature rangeExternal frequency synchronizationRESEToutput with internal filter and 3-ms release timerAutomatic light load mode for improved efficiencyPin-selectable forced PWM modeBuilt-In compensation, soft start, current limit, thermal shutdown, and UVLO0.35-V dropout with 3.5-A Load at 25°C (Typical)18-µA IQ_VIN: quiescent current at 3.3 VOUTand no load (typical)Output voltage: 5 V, 3.3 V, and ADJ (1 V to 20 V)±1.5% reference voltage toleranceCreate a custom design using the LMS3655-Q1 with theWEBENCH Power DesignerAEC-Q100-qualified for automotive applicationsDevice temperature grade 1: –40°C to +125°C ambient operating temperatureDevice HBM classification level 2Device CDM classification level C696% Peak efficiency while converting 12 V to 5 VLow EMI and minimized switch node ringing400-kHz (±10%) fixed switching frequency–40°C to +150°C junction temperature rangeExternal frequency synchronizationRESEToutput with internal filter and 3-ms release timerAutomatic light load mode for improved efficiencyPin-selectable forced PWM modeBuilt-In compensation, soft start, current limit, thermal shutdown, and UVLO0.35-V dropout with 3.5-A Load at 25°C (Typical)18-µA IQ_VIN: quiescent current at 3.3 VOUTand no load (typical)Output voltage: 5 V, 3.3 V, and ADJ (1 V to 20 V)±1.5% reference voltage toleranceCreate a custom design using the LMS3655-Q1 with theWEBENCH Power Designer

Description

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. 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.