Texas Instruments LMR36503RFEVM Manuale utente

SNVU672–February 2020

LMR36503RFEVM User’s Guide

User's Guide

SNVU672–February 2020

LMR36503RFEVM User’s Guide

The Texas Instruments LMR36503RFEVM evaluation module help designers evaluate the operation and

performance of the LMR36503 wide-input buck converters. The LMR36503 is an easy-to-use synchronous

step-down DC/DC converter capable of driving up to 0.3 A of load current from an input voltage of up to

65 V. The LMR36503RFEVM features an output voltage of 3.3 V or 5 V and a switching frequency of 1

MHz. See the LMR36503 3-V–65-V, 0.3-A Ultra-Small Synchronous Buck Converter with Ultra-Low IQdata

sheet for additional features, detailed descriptions, and available options.

Table 1. Device and Package Configurations

EVM U1 FREQUENCY SPREAD SPECTRUM CURRENT PIN 1 TRIM

LMR36503RFEVM LMR36503RFRPE 1000 kHz Disabled 0.3 A RT with FPWM

Figure 1. LMR36503RFEVM Board

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Contents

1 Setup .......................................................................................................................... 3

2 Operation ..................................................................................................................... 5

3 Schematic..................................................................................................................... 6

4 Board Layout ................................................................................................................. 7

5 Bill of Materials............................................................................................................... 9

List of Figures

1 LMR36503RFEVM Board................................................................................................... 1

2 EVM Board Connections.................................................................................................... 3

3 Jumper Locations............................................................................................................ 4

4 LMR36503RFEVM Schematic ............................................................................................. 6

5 Top View of EVM ............................................................................................................ 7

6 EVM Top Copper Layer..................................................................................................... 7

7 EVM Mid Layer One......................................................................................................... 7

8 EVM Mid Layer Two......................................................................................................... 8

9 EVM Bottom Copper Layer................................................................................................. 8

List of Tables

1 Device and Package Configurations ...................................................................................... 1

2 Bill Of Materials .............................................................................................................. 9

Trademarks

All trademarks are the property of their respective owners.

Load

(+)

(-)

DMM

(-)

(+) DMM

(-)

(+)

Input

Supply

(+)

(-)

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Setup

SNVU672–February 2020

LMR36503RFEVM User’s Guide

1 Setup

This section describes the test points and connectors on the EVM and how to properly connect, set up,

and use the LMR36503RFEVM.

1.1 Test Points

The test points on the top of the board can be used for connecting to the input and output of the EVM.

See Figure 2 for typical test setup. The functions of the test points connections are:

•VIN_EMI — Input supply to EVM including an EMI filter. Connect to a suitable input supply. Connect at

this point for conducted EMI test.

•GND — Ground connection for the input supply as well as test points for ground connection

•VIN — Input supply to the IC. Can be connected to DMM to measure input voltage after EMI filter

•VOUT — Output voltage test point of EVM. Can be connected to a desired load

•EN — This test point is connected to the EN pin. By default, there is a pullup resistor R2 (RENT) to

VIN to enable the IC.

•PGOOD — This test point is connected to the PGOOD pin from the IC. It is an open-drain output of the

PGOOD pin. Can be tied to external supply through a pullup resistor or left open

•SYNC — In a MODE/SYNC trim part, this test point is connected to the SYNC pin of the IC. Can be

connected to an external clock to synchronize the IC. Make sure R4 (RMODE) is installed and R5 (RT)

is not installed. In a RT trim part, this test point is connected to the RT pin of the IC when the R4

(RMODE) is installed.

•VCC — This test point is connected to the VCC pin.

•SW — This test point is connected to the switch node.

Figure 2. EVM Board Connections

MODE/RT SELECTION

JUMPER

ENABLE OFF

JUMPER

PGOOD SELECTION

JUMPER

VOUT SELECTION

JUMPER

Setup

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1.2 Jumpers

See Figure 3 for jumper locations.

•JEN - This jumper allows the ENABLE input to be connected to GND in order to disable the IC. By

default, this jumper is left open since there is a pullup resistor R2 (RENT) to VIN to enable the IC.

•JPGOOD - Use this jumper to select how the PGOOD pin can be connected. A jumper can be used to

connect pin 2 and 3. In this configuration, the PGOOD pin will be pulled up to VOUT through R9

(RPGOOD) with a value of 100 kΩ. By default, this jumper is left open.

•JMODE/RT - Use this jumper to select the mode of operation in a MODE/SYNC trim part.

Connecting a jumper between pin 1 and 2 cause the IC to operate in PFM (Pulse Frequency

Modulation) mode for a higher efficiency at light load. A jumper between pin 2 and pin 3 causes the IC

to operate in FPWM mode (Forced Pulse Width Modulation) mode. By default, the jumper is connected

between pin 1 and 2.

In an RT trim part, connecting this jumper from pin 1 and 2 sets the switching frequency to 2.2 MHz

and connecting this jumper from pin 2 and 3 sets the switching frequency to 1 MHz. See the

LMR36503 3-V–65-V, 0.3-A Ultra-Small Synchronous Buck Converter with Ultra-Low IQdata sheet for

more information on switching frequency configuration.

•JVOUT This jumper can be used to select the output voltage on the EVM. Leaving the jumper open

sets the EVM output voltage to 3.3 V whereas adding a jumper sets the output voltage on the EVM to

be 5 V.

Figure 3. Jumper Locations

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Operation

SNVU672–February 2020

LMR36503RFEVM User’s Guide

2 Operation

2.1 Quick Start

1. Connect the voltage supply between the VIN_EMI and GND test points.

2. Connect the load between the VOUT and GND test points.

3. Set the supply voltage at an appropriate level between 5.5 V to 65 V. Set the current limit of the supply

to an appropriate level.

4. Turn on the power supply. With the default configuration, the EVM powers up and provides VOUT = 3.3

5. Monitor the output voltage. The maximum load current must be 0.3 A with the LMR36503 device.

0.1uF

CIN2

1uF

CVCC

PGOOD

TP3

GND

49.9

RINJ

TP8

GND

1uF

4.99

0.1uF

Cfilt

DNP

TP6

VIN_EMI

TP7

GND

22uF

CBulk

JMODE/RT

JPGOOD

100k

RPGOOD

PGOOD

ENVCC

GND

VOUT

GND

BOOT

GND

VCC

GND

VIN

TP4

VOUT

TP1

VOUT

TP5

VIN

JEN

100k

RENB

DNP

100k

RENT

TP10

SYNC

TP11

TP9

PGOOD

TP2

GND

VIN = 5.5V - 65V

2.2uF

CIN1

2.2uF

CIN3

0.1uF

C11

Cfilt1

0.1uF

C12

Cfilt2

VINEMI

100k

RFBT

GND

22uF

COUT1

22uF

C10

COUT2

DNP

10pF

C13

CFF

DNP

RMODE

VOUT = 3.3V

VIN

VINEMI

GND

VOUT

VOS

AGND

TP13

VCC

TP12

TP14

GND

43.2k

RFBB1

59.0k

R10

RFBB2

JVOUT

PGOOD

EN/UVLO

VIN

SW 5

BOOT 6

VCC

FB 8

GND 9

LMR36503RFRPET

39.2k

DNP

47uH

TOP BOT

EC1

305-024-521-201

0.1uF

SH-J1

SNT-100-BK-G

Assembly Note

ZZ5

Place SH-J1 on J2 (JMODE/RT) in pin 2 and 3

NT1

Net-Tie

VOS

Schematic

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3 Schematic

Figure 4. LMR36503RFEVM Schematic

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Board Layout

SNVU672–February 2020

LMR36503RFEVM User’s Guide

4 Board Layout

Figure 5. Top View of EVM

Figure 6. EVM Top Copper Layer

Figure 7. EVM Mid Layer One

Board Layout

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Figure 8. EVM Mid Layer Two

Figure 9. EVM Bottom Copper Layer

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Bill of Materials

SNVU672–February 2020

LMR36503RFEVM User’s Guide

5 Bill of Materials

Table 2. Bill Of Materials

DESIGNATOR COMMENT DESCRIPTION MANUFACTURER PART NUMBER QUANTITY

C1, C9 CIN1, CIN3 CAP, CERM, 2.2 µF, 100 V, ±10%, X7S, AEC-Q200

Grade 1, 1206 TDK CGA5L3X7S2A225K160AB 2

C2 CIN2 CAP, CERM, 0.1 µF, 100 V, ±10%, X7R, 0603 MuRata GRM188R72A104KA35D 1

C3 CB CAP, CERM, 0.1 µF, 16 V, ±10%, X7R, 0402 MuRata GCM155R71C104KA55D 1

C4 CVCC CAP, CERM, 1 µF, 16 V, ±10%, X7R, 0603 Wurth Elektronik 885012206052 1

C5 COUT1 CAP, CERM, 22 µF, 10 V, ±10%, X7R, AEC-Q200

Grade 1, 1206 MuRata GCM31CR71A226KE02 1

C6 Cd CAP, CERM, 1 µF, 100 V, ±10%, X7R, 1206 TDK C3216X7R2A105K160AA 1

C7 Cfilt CAP, CERM, 0.1 µF, 100 V, ±10%, X7R, AEC-Q200

Grade 1, 0805 TDK CGA4J2X7R2A104K125AA 0

C8 CBulk CAP, AL, 22 µF, 100 V, ±20%, 1.3 Ω, AEC-Q200 Grade

2, SMD Panasonic EEE-FK2A220P 1

C10 COUT2 CAP, CERM, 22 µF, 10 V, ±10%, X7R, AEC-Q200

Grade 1, 1206 MuRata GCM31CR71A226KE02 0

C11, C12 Cfilt1, Cfilt2 CAP, CERM, 0.1 µF, 100 V, ±10%, X7R, AEC-Q200

Grade 1, 0805 TDK CGA4J2X7R2A104K125AA 2

C13 CFF CAP, CERM, 10 pF, 50 V, ±5%, C0G/NP0, AEC-Q200

Grade 1, 0402 TDK CGA2B2C0G1H100D050BA 0

FID1, FID2,

FID3, FID4,

FID5, FID6 Fiducial Fiducial mark. There is nothing to buy or mount. N/A N/A 0

J1, J2 JPGOOD,

JMODE/RT Header, 100 mil, 3x1, Gold, TH Samtec HTSW-103-07-G-S 2

J3, J4 JEN, JVOUT Header, 100 mil, 2x1, Gold, TH Samtec HTSW-102-07-G-S 2

L1 MSS6132-473MLB Inductor, Shielded Drum Core, Ferrite, 47 µH, 0.93 A,

0.38 Ω, SMD Coilcraft MSS6132-473MLB 1

L2 FBMH3225HM601

NT Ferrite Bead, 600 Ωat 100 MHz, 3 A, 1210 Taiyo Yuden FBMH3225HM601NT 1

LBL1 THT-14-423-10 Thermal Transfer Printable Labels, 0.650" W x 0.200" H

- 10 000 per roll Brady THT-14-423-10 1

R1 RENB RES, 100 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 Vishay-Dale CRCW0402100KFKED 0

R2, R3 RENT, RFBT RES, 100 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 Vishay-Dale CRCW0402100KFKED 2

R4 RMODE RES, 0, 5%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW06030000Z0EA 1

R5 RT RES, 39.2 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 Vishay-Dale CRCW040239K2FKED 0

R6 RINJ RES, 49.9, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 Vishay-Dale CRCW040249R9FKED 1

R7 RFBB1 RES, 43.2 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 Vishay-Dale CRCW040243K2FKED 1

R8 Rd RES, 4.99, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW06034R99FKEA 1

R9 RPGOOD RES, 100 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW0603100KFKEA 1

R10 RFBB2 RES, 59.0 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 Vishay-Dale CRCW040259K0FKED 1

SH-J1 SNT-100-BK-G Shunt, 100mil, Gold plated, Black Samtec SNT-100-BK-G 1

TP1, TP5 VOUT, VIN Test Point, Miniature, SMT Keystone 5015 2

TP2, TP14 GND Test Point, Miniature, Black, TH Keystone 5001 2

TP3, TP4, TP6,

TP7, TP8

GND, VOUT,

VIN_EMI, GND,

GND Terminal, Turret, TH, Double Keystone 1502-2 5

TP9, TP10,

TP11 PGOOD, SYNC,

EN Test Point, Miniature, White, TH Keystone 5002 3

TP12, TP13 SW, VCC Test Point, Miniature, Red, TH Keystone 5000 2

U1 LMR36503RFRPE

TLMR36503 Wide Input 65-V Synchronous, DC-DC Buck

Converter, RPE0009A (VQFN-9) Texas Instruments LMR36503RFRPET 1

STANDARD TERMS FOR EVALUATION MODULES

1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or

documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance

with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.

1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility

evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not

finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For

clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions

set forth herein but rather shall be subject to the applicable terms that accompany such Software

1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,

or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production

system.

2Limited Warranty and Related Remedies/Disclaimers:

2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License

Agreement.

2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM

to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by

neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have

been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications

or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control

techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.

User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)

business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.

2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit

User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty

period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or

replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be

warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day

warranty period.

WARNING

Evaluation Kits are intended solely for use by technically qualified,

professional electronics experts who are familiar with the dangers

and application risks associated with handling electrical mechanical

components, systems, and subsystems.

User shall operate the Evaluation Kit within TI’s recommended

guidelines and any applicable legal or environmental requirements

as well as reasonable and customary safeguards. Failure to set up

and/or operate the Evaluation Kit within TI’s recommended

guidelines may result in personal injury or death or property

damage. Proper set up entails following TI’s instructions for

electrical ratings of interface circuits such as input, output and

electrical loads.

NOTE:

EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION

KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.

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