LMR51603XFDBVR

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Texas Instruments

4.5V-TO-65V 0.3A SYNCHRONOUS BUCK CONVERTER WITH 25ΜA QUIESCENT CURRENT

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LMR51603XFDBVR

Active

Texas Instruments

4.5V-TO-65V 0.3A SYNCHRONOUS BUCK CONVERTER WITH 25ΜA QUIESCENT CURRENT

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Description Specifications Series Pricing CAD Documents

Description

General part information

LMR51603 Series

The LMR51603 is a wide-VIN, easy-to-use, synchronous buck converter capable of driving up to 300mA load current. With a wide input range of 4V to 65V, the device is designed for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR51603 operates at 400kHz and 1.1MHz switching frequency to support use of relatively small inductors for an optimized design size. The LMR51603 has a pulse frequency modulation (PFM version) to realize high efficiency at light load and forced pulse width modulation (FPWM version) to achieve constant frequency and small output voltage ripple over the full load range. Soft-start and compensation circuits are implemented internally, which allow the device to be used with minimal external components.

The device has built-in protection features, such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation.

Technical Specifications

Parameters and characteristics for this part

Specification	LMR51603XFDBVR

Current - Output	300 mA
Frequency - Switching	400 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	150 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package / Case	SOT-23-6
Package Name	SOT-23-6
Synchronous Rectifier	Yes
Topology	Buck
Voltage - Input (Max)	65 V
Voltage - Input (Min)	4 V
Voltage - Output (Max)	28 V
Voltage - Output (Min/Fixed)	0.8 V

LMR51603 Series

4.5V-to-65V 0.3A synchronous buck converter with 25µA quiescent current

Part	Output Type	Synchronous Rectifier	Mounting Type	Voltage - Input (Max)	Voltage - Output (Min/Fixed)	Voltage - Input (Min)	Number of Outputs	Output Configuration	Package Name	Function	Topology	Frequency - Switching	Package / Case	Operating Temperature (Min)	Operating Temperature (Max)	Current - Output	Voltage - Output (Max)
Texas Instruments LMR51603Y3DBVR	Adjustable Fixed	Yes	Surface Mount	65 V	0.8 V	4 V	1	Positive	SOT-23-6	Step-Down	Buck	1.1 MHz	SOT-23-6	-40 °C	150 °C	300 mA	28 V
Texas Instruments LMR51603YDBVR	Adjustable	Yes	Surface Mount	65 V	0.8 V	4 V	1	Positive	SOT-23-6	Step-Down	Buck	1.1 MHz	SOT-23-6	-40 °C	150 °C	300 mA	28 V
Texas Instruments LMR51603YFDBVR	Adjustable	Yes	Surface Mount	65 V	0.8 V	4 V	1	Positive	SOT-23-6	Step-Down	Buck	1.1 MHz	SOT-23-6	-40 °C	150 °C	300 mA	28 V
Texas Instruments LMR51603XDBVR	Adjustable	Yes	Surface Mount	65 V	0.8 V	4 V	1	Positive	SOT-23-6	Step-Down	Buck	400 kHz	SOT-23-6	-40 °C	150 °C	300 mA	28 V
Texas Instruments LMR51603XFDBVR	Adjustable	Yes	Surface Mount	65 V	0.8 V	4 V	1	Positive	SOT-23-6	Step-Down	Buck	400 kHz	SOT-23-6	-40 °C	150 °C	300 mA	28 V

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LMR51603XFDBVR | Datasheet

LMR51603 65V, 300mA, Synchronous Buck Converter With Low IQ datasheet

LMR51603 Evaluation Module User's Guide

LMR51603 Functional Safety FIT Rate, FMD and Pin FMA

LMR51603EVM EU Declaration of Conformity (DoC)