LM5165 datasheet(21/52 Pages) TI

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8 Applications and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The LM5165-Q1 only requires a few external components to convert from a wide range of supply voltages to

a fixed output voltage. To expedite and streamline the process of designing of a LM5165-Q1-based converter,

a comprehensive LM5165-Q1 Quick-start design tool is available for download to assist the designer with

component selection for a given application. WEBENCH online software is also available to generate complete

designs, leveraging iterative design procedures and access to comprehensive component databases. The

following sections discuss the design procedure for both COT and PFM modes using specific circuit design

examples.

As mentioned previously, the LM5165-Q1 also integrates several optional features to meet system design

requirements, including precision enable, UVLO, programmable soft start, programmable switching frequency

in COT mode, adjustable current limit, and PGOOD indicator. Each application incorporates these features

as needed for a more comprehensive design. The application circuits detailed below show LM5165-Q1

configuration options suitable for several application use cases. Refer to the LM5165EVM-HD-C50X and

LM5165EVM-HD-P50A EVM user's guides for more detail.

8.2 Typical Applications

For step-by-step design procedure, circuit schematics, bill of materials, PCB files, simulation and test results of an LM5165-powered

implementation, refer to Field Transmitter with Bluetooth® Low Energy Connectivity Powered from 4 to 20-mA Current Loop reference

design.

8.2.1 Design 1: Wide VIN, Low IQ COT Converter Rated at 5 V, 150 mA

The schematic diagram of a 5-V, 150-mA COT converter is given in Figure 8-1.

OUT = 5 V

OUT = 150 mA

VOUT

ILIM

VIN

HYS

GND

PGOOD

LM5165X

OUT

220

IN = 5 V...65 V

133 k:

ESR

1.5 :

47 nF

Figure 8-1. Schematic for Design 1 With VIN(nom) = 12 V, VOUT = 5 V, IOUT(max) = 150 mA, FSW(nom) = 220 kHz

8.2.1.1 Design Requirements

The target full-load efficiency is 91% based on a nominal input voltage of 12 V and an output voltage of 5 V. The

required input voltage range is 5 V to 65 V. The LM5165X-Q1 is chosen to deliver a fixed 5-V output voltage. The

switching frequency is set by resistor RRT at 220 kHz. The output voltage soft-start time is 6 ms. The required

components are listed in Table 8-1.

www.ti.com

LM5165-Q1

SNVSAJ3C – MARCH 2016 – REVISED DECEMBER 2022

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