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See Technical Specifications

LMS36553QRNLRQ1

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

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LMS36553QRNLRQ1
Datasheet:

LMS36553QRNLRQ1 Datasheet (PDF)
Series:

Automotive, AEC-Q100
Function:

Step-Down
Output Configuration:

Positive
Topology:

Buck
EDA/CAD Models:

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LMS36553QRNLRQ1 General 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.

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Key Features

AEC-Q100-qualified for automotive applications
- Device temperature grade 1: –40°C to +125°C ambient operating temperature
- Device HBM classification level 2
- Device CDM classification level C6
96% Peak efficiency while converting 12 V to 5 V
Low EMI and minimized switch node ringing
400-kHz (±10%) fixed switching frequency
–40°C to +150°C junction temperature range
External frequency synchronization
RESET output with internal filter and 3-ms release timer
Automatic light load mode for improved efficiency
Pin-selectable forced PWM mode
Built-In compensation, soft start, current limit, thermal shutdown, and UVLO
0.35-V dropout with 3.5-A Load at 25°C (Typical)
18-µA I_{Q_VIN}: quiescent current at 3.3 V_OUT and no load (typical)
Output voltage: 5 V, 3.3 V, and ADJ (1 V to 20 V)
±1.5% reference voltage tolerance
Create a custom design using the LMS3655-Q1 with the WEBENCH Power Designer

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)Voltage Regulators - DC DC Switching Regulators	Series	Automotive, AEC-Q100
Function	Step-Down	Output Configuration	Positive
Topology	Buck	Output Type	Fixed
Number of Outputs	1	Voltage - Input (Min)	3.9V
Voltage - Input (Max)	36V	Voltage - Output (Min/Fixed)	3.3V
Voltage - Output (Max)	-	Current - Output	5.5A
Frequency - Switching	250kHz ~ 500kHz	Synchronous Rectifier	No
Operating Temperature	-40°C ~ 125°C (TA)	Mounting Type	Surface Mount, Wettable Flank
Base Product Number	LMS3655