LM34919CQSDEVM - Texas Instruments

LM34919C-Q1 Evaluation Board User's Guide

User's Guide

Literature Number: SNVU196

SEPTEMBER 2013

Contents

1 INTRODUCTION .................................................................................................................. 5

2 THEORY OF OPERATION ..................................................................................................... 5

3 BOARD LAYOUT AND PROBING ........................................................................................... 6

4 BOARD CONNECTION/START-UP ......................................................................................... 6

5 OUTPUT RIPPLE CONTROL ................................................................................................. 6

6 MONITOR THE INDUCTOR CURRENT .................................................................................... 8

7 MINIMUM LOAD CURRENT ................................................................................................... 8

8 CIRCUIT PERFORMANCE ..................................................................................................... 9

9 TYPICAL WAVEFORMS ...................................................................................................... 11

10 PC BOARD LAYOUT .......................................................................................................... 13

2Table of Contents SNVU196–SEPTEMBER 2013

Submit Documentation Feedback

www.ti.com

List of Figures

1 Evaluation Board - Top Side .............................................................................................. 5

2 Lowest Cost Configuration................................................................................................. 6

3 Intermediate Ripple Configuration ........................................................................................ 7

4 Minimum Output Ripple Configuration ................................................................................... 8

5 Complete Evaluation Board Schematic.................................................................................. 8

6 Efficiency vs Load Current................................................................................................. 9

7 Efficiency vs Input Voltage................................................................................................. 9

8 Switching Frequency vs. Input Voltage................................................................................. 10

9 Load Derating Curve...................................................................................................... 10

10 Continuous Conduction Mode ........................................................................................... 11

11 Discontinuous Conduction Mode........................................................................................ 11

12 Enable, Output Voltage, and PGD at Startup.......................................................................... 12

13 Board Silkscreen........................................................................................................... 13

14 Board Top Layer........................................................................................................... 13

15 Board Bottom Layer (Viewed from Top)................................................................................ 14

List of Tables

1 Bill of Materials.............................................................................................................. 8

SNVU196–SEPTEMBER 2013 List of Figures

User's Guide

SNVU196–SEPTEMBER 2013

LM34919C-Q1 Evaluation Board

The LM34919CQSDEVM evaluation board provides the design engineer with a fully functional buck

regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 3.3

V output over an input range of 4.5 V to 24 V. The circuit delivers load current to 600 mA, with current limit

set at a nominal 640 mA (valley current limit). The board is populated with all components except R7, C6,

and C7. These components provide options for managing the output ripple as described later in this

document.

All trademarks are the property of their respective owners.

4LM34919C-Q1 Evaluation Board SNVU196–SEPTEMBER 2013

Submit Documentation Feedback

OUT

SW 12 2

F Hz

35.5 10 R



u u

www.ti.com

INTRODUCTION

1 INTRODUCTION

The LM34919CQSDEVM evaluation board provides the design engineer with a fully functional buck

regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 3.3

V output over an input range of 4.5 V to 24 V. The circuit delivers load currents to 600 mA, with valley

current limit set at 640 mA. The board is populated with all components except R7, C6 and C7. These

components provide options for managing the output ripple as described later in this document.

The board’s specification are:

• Input Voltage: 4.5 V to 24 V

• Output Voltage: 3.3 V

• Maximum load current: 600 mA

• Minimum load current: 0 A

• Current Limit: 768 mA to 812 mA

• Measured Efficiency: 87% (VIN =6V,IOUT = 300 mA)

• Nominal Switching Frequency: 1.5 MHz

• Size: 1.4 inches x 2.3 inches

Figure 1. Evaluation Board - Top Side

2 THEORY OF OPERATION

Refer to the evaluation board topside view in Figure 1. At nominal input voltage, VIN = 12 V, the switching

frequency can be determined by R2(RON resistor) and output voltage VO, according to Equation 1:

(1)

In LM34919C, like other constant on-time regulators, the on-time varies inversely with VIN to maintain a

nearly constant switching frequency. For stable, fixed frequency operation, a minimum of 25 mV of ripple

is required at FB to switch the regulation comparator. The average load current limit threshold is ≊768 mA

at Vin = 4.5 V, and ≊812 mA at Vin = 24 V. The variation is due to the change in ripple current amplitude

as Vin varies. Refer to the LM34919C data sheet for a more detailed block diagram, and a complete

description of the various functional blocks.

SNVU196–SEPTEMBER 2013 LM34919C-Q1 Evaluation Board

BST

VCC

ISEN

SGND

VIN

61.9k

RTN

GND

On Timer Minimum

Off

Timer

Logic

Current Limit

Detect

GND

3.3V

LM34919C

4.5V to 24V

RON

PGD

100k

2.52V

1.2VREF

C10

0.022 µF

10k

VOUT

C4 VIN

0.1 µF

0.022 µF

L1 8.2 µH R4 0

VOUT

2.49k

1 µF 1 µF

787

0.47

10 µF

0.1µF

Regulation

Comparator

0.92VREF

BOARD LAYOUT AND PROBING

www.ti.com

3 BOARD LAYOUT AND PROBING

The picture in Figure 1 also shows the placement of the circuit components. The following should be kept

in mind when the board is powered:

1) The LM34919C, and diode D1 may be hot to touch when operating at high input voltage and high load

current.

2) Use CAUTION when probing the circuit at high input voltages to prevent injury, as well as possible

damage to the circuit.

3) At maximum load current (0.6 A), the wire size and length used to connect the load becomes important.

Ensure there is not a significant drop in the wires between this evaluation board and the load.

4 BOARD CONNECTION/START-UP

The input connections are made to the J1 connector. The load is connected to the J3 (OUT) and J4

(GND) connectors. Ensure the wires are adequately sized for the intended load current. Before start-up a

voltmeter should be connected to the input terminals, and to the output terminals. The load current should

be monitored with an ammeter or a current probe. It is recommended that the input voltage be increased

gradually to 4.5 V and load current be set at 0 A, at which time the output voltage should be ≊3.3 V. If the

output voltage is correct, then increase the input voltage as desired and proceed loading the evaluation

board as shown in Figure 8. DO NOT EXCEED 40 V AT VIN.

5 OUTPUT RIPPLE CONTROL

The LM34919C requires a minimum of 25 mVp-p ripple at the FB pin, in phase with the switching

waveform at the SW pin, for proper operation. The required ripple can be supplied from ripple at VOUT,

through the feedback resistors as described in Options A and B below, or the ripple can be generated

separately (using R7, C6, and C7) in order to keep the ripple at VOUT at a minimum (Option C).

Option A) Lowest Cost Configuration: This evaluation board is supplied with R6 installed in series with

the output capacitance (C8, C9). R6 is chosen to generate ≥25 mVp-p at VOUT. Using 0.47 Ωfor R6, the

ripple at VOUT ranges from ≊38 mVp-p to ≊158 mVp-p over the input voltage range. If the application can

accept this ripple level, this is the most economical solution. The circuit is shown in Figure 2.

Figure 2. Lowest Cost Configuration

Option B) Intermediate Ripple Configuration: This configuration generates less ripple at VOUT than

option A above by the addition of one capacitor (Cff) across R5, as shown in Figure 3.

6LM34919C-Q1 Evaluation Board SNVU196–SEPTEMBER 2013

Submit Documentation Feedback

R7 x C6 = (VIN ± VA) x tON

Cff ttON (max) x 3

(R5//R8)

BST

VCC

ISEN

SGND

VIN

61.9k

RTN

GND

On Timer Minimum

Off

Timer

Logic

Current Limit

Detect

GND

3.3V

LM34919C

4.5V to 24V

RON

PGD

100k

2.52V

1.2VREF

C10

0.022 µF

10k

VOUT

C4 VIN

0.1 µF

0.022 µF

Cff

2200 pF

L1 8.2 µH R1 0

VOUT

2.49k

1 µF 1 µF

787

0.4

10 µF

0.1µF

Regulation

Comparator

0.92VREF

www.ti.com

OUTPUT RIPPLE CONTROL

Figure 3. Intermediate Ripple Configuration

Since the output ripple is passed by Cff to the FB pin with little or no attenuation, R6 can be reduced so

the minimum ripple at VOUT is ≊25 mVp-p. The minimum value for Cff is calculated from:

(2)

where tON(max) is the maximum on-time (at minimum VIN), and R5//R8 is the parallel equivalent of the

feedback resistors. See Figure 3.

Option C) Minimum Ripple Configuration: To obtain minimum ripple at VOUT, R6 is set to 0Ω, and R7,

C6, and C7 are added to generate the required ripple for the FB pin. In this configuration, the output ripple

is determined primarily by the ESR of the output capacitance and the inductor’s ripple current.

The ripple voltage required by the FB pin is generated by R7, C6, and C7 since the SW pin switches from

–1 V to VIN, and the right end of C6 is a virtual ground. The values for R7 and C6 are chosen to generate

a 50-100 mVp-p triangle waveform at their junction. That triangle wave is then coupled to the FB pin

through C7. The following procedure is used to calculate values for R7, C6 and C7:

1) Calculate the voltage VA:

VA= VOUT – (VSW x (1 – (VOUT/VIN))) (3)

where VSW is the absolute value of the voltage at the SW pin during the off-time (typically 1 V), and VIN is

the minimum input voltage. For this circuit, VAcalculates to 3.03 V. This is the approximate DC voltage at

the R7/C6 junction, and is used in the next equation.

2) Calculate the R7 x C6 product:

(4)

where tON is the maximum on-time, VIN is the minimum input voltage, and ΔV is the desired ripple

amplitude at the R7/C6 junction, 50 mVp-p for this example.

R7 and C6 are then chosen from standard value components to satisfy the above product. Typically C6 is

3000 to 5000 pF, and R7 chosen close to 10 kΩ. C7 is chosen large compared to C6, typically 0.1 µF.

See Figure 4.

SNVU196–SEPTEMBER 2013 LM34919C-Q1 Evaluation Board

R7 C6

TP2

TP4

TP3 TP1

BST

VCC

ISEN

SGND

VIN

61.9k

RTN

GND

On Timer Minimum

Off

Timer

Logic

Regulation

Comparator Current Limit

Detect

GND

3.3V

LM34919C

4.5V to 24V

RON

PGD

100k

2.52V

0.92VREF

1.2VREF

C10

0.022 µF

10k

VOUT

C4 VIN

0.1 µF

0.022 µF

L1 8.2 µH R4 0

VOUT

2.49k

1 µF 1 µF

787

0.47

10 µF

0.1µF

R7 C6

BST

VCC

ISEN

SGND

VIN

61.9k

RTN

GND

On Timer Minimum

Off

Timer

Logic

Regulation

Comparator Current Limit

Detect

GND

3.3V

LM34919C

4.5V to 24V

RON

PGD

100k

2.52V

0.92VREF

1.2VREF

C10

0.022 µF

10k

VOUT

C4 VIN

0.1 µF

L1 8.2 µH R4 0

VOUT

2.49k

1 µF 1 µF

787

0

10 µF

0.1µF

0.022 µF

7.87 k

C10

0.1 µF

3300 pF

MONITOR THE INDUCTOR CURRENT

www.ti.com

Figure 4. Minimum Output Ripple Configuration

6 MONITOR THE INDUCTOR CURRENT

The inductor’s current can be monitored or viewed on a scope with a current probe. Remove R4, and

install an appropriate current loop across the two large pads where R4 was located. In this way the

inductor’s ripple current and peak current can be accurately determined.

7 MINIMUM LOAD CURRENT

The LM34919C requires a minimum load current of ≊1 mA to ensure the boost capacitor (C5) is recharged

sufficiently during each off-time. In this evaluation board, the minimum load current is provided by the

feedback resistors allowing the board’s minimum load current at VOUT to be specified at zero.

Figure 5. Complete Evaluation Board Schematic

Table 1. Bill of Materials

ITEM DESCRIPTION MFG. PART NUMBER PACKAGE VALUE

C1,C2 Ceramic Capacitor TDK C1005X7R1H104K050BB 0402 0.1 µF,50 V

C3,C4 Ceramic Capacitor Murata GRM21BR71H105KA12L 0805 1 µF,50 V

C5,C10 Ceramic Capacitor Murata GRM155R71H223KA12D 0402 0.022 µF,50 V

C6 Ceramic Capacitor Unpopulated 0402

C7 Ceramic Capacitor Unpopulated 0402

8LM34919C-Q1 Evaluation Board SNVU196–SEPTEMBER 2013

Submit Documentation Feedback

0 5 10 15 20 25

Efficiency (%)

Input Voltage (V)

Load = 200mA

Load = 300mA

Load = 400mA

Load = 500mA

Load = 600mA

C002

Vout = 3.3V

Fsw = 1.5 MHz

0.2 0.3 0.4 0.5 0.6

Efficiency (%)

Load Current (A)

Vin = 4.5V

Vin = 6V

Vin = 9V

Vin = 12V

Vin = 18V

Vin = 24V

C001

Vout = 3.3V

Fsw = 1.5 MHz

www.ti.com

CIRCUIT PERFORMANCE

Table 1. Bill of Materials (continued)

ITEM DESCRIPTION MFG. PART NUMBER PACKAGE VALUE

C8,C9 Ceramic Capacitor Murata GRM21BR71A106KE51L 0805 10 µF,10 V

D1 Schottky Diode Zetex ZLLS2000TA SOT-23-6 40 V, 2.2 A

L1 Power Inductor Wurth Elektronik 744053008 5.8mm x 5.8mm 8.2 µH, 2.1 A

R1 Resistor Vishay-Dale CRCW040210K0FKED 0402 10 kΩ

R2 Resistor Vishay-Dale CRCW040261K9FKED 0402 61.9 kΩ

R3 Resistor Vishay-Dale CRCW0402100KFKED 0402 100 kΩ

R4 Resistor Vishay-Dale CRCW08050000Z0EA 0805 0 ΩJumper

R5 Resistor Vishay-Dale CRCW0402787RFKED 0402 787 Ω

R6 Resistor Vishay-Dale RCWE0805R470FKEA 0805 0.47 Ω

R7 Resistor Unpopulated 0402

R8 Resistor Vishay-Dale CRCW04022K49FKED 0402 2.49 kΩ

U1 Switching Regulator Texas Instruments LM34919CQSD 12 Pin WSON

8 CIRCUIT PERFORMANCE

Figure 6. Efficiency vs Load Current

Figure 7. Efficiency vs Input Voltage

SNVU196–SEPTEMBER 2013 LM34919C-Q1 Evaluation Board

04.5 4.6 4.7 4.8 4.9 5 24

0.1

0.2

0.4

0.5

0.6

0.3

INPUT VOLTAGE (V)

LOAD CURRENT (A)

OUTPUT VOLTAGE

REGULATION

0.5

1.0

1.5

2.0

2.5

3.0

4 8 12 16 20 24

Switching Frequency (MHz)

Input Voltage (V)

C003

Vout = 3.3V

5RQ N

CIRCUIT PERFORMANCE

www.ti.com

Figure 8. Switching Frequency vs. Input Voltage

Figure 9. Load Derating Curve

10 LM34919C-Q1 Evaluation Board SNVU196–SEPTEMBER 2013

Submit Documentation Feedback

www.ti.com

TYPICAL WAVEFORMS

9 TYPICAL WAVEFORMS

Trace 2 = VOUT ripple (ac coupled)

Trace 4 = inductor Current

Trace 1 = SW Pin

Vin = 12 V, IOUT = 400 mA

Figure 10. Continuous Conduction Mode

Trace 2 = VOUT ripple (ac coupled)

Trace 4 = inductor Current

Trace 1 = SW Pin

Vin = 12 V, IOUT = 20 mA

Figure 11. Discontinuous Conduction Mode

SNVU196–SEPTEMBER 2013 LM34919C-Q1 Evaluation Board

TYPICAL WAVEFORMS

www.ti.com

Trace 3 = VOUT

Trace 2 = EN

Trace 4 = Power Good

Trace 1 = VIN = 12 V

IOUT = 300 mA

Figure 12. Enable, Output Voltage, and PGD at Startup

12 LM34919C-Q1 Evaluation Board SNVU196–SEPTEMBER 2013

Submit Documentation Feedback

www.ti.com

PC BOARD LAYOUT

10 PC BOARD LAYOUT

Figure 13. Board Silkscreen

Figure 14. Board Top Layer

SNVU196–SEPTEMBER 2013 LM34919C-Q1 Evaluation Board

PC BOARD LAYOUT

www.ti.com

Figure 15. Board Bottom Layer (Viewed from Top)

14 LM34919C-Q1 Evaluation Board SNVU196–SEPTEMBER 2013

Submit Documentation Feedback

EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS

Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims

arising from the handling or use of the goods.

Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from

the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO

BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF

MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH

ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL

DAMAGES.

Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This

notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety

programs, please visit www.ti.com/esh or contact TI.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or

combination in which such TI products or services might be or are used. TI currently deals with a variety of customers for products, and

therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design,

software performance, or infringement of patents or services described herein.

REGULATORY COMPLIANCE INFORMATION

As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal

Communications Commission (FCC) and Industry Canada (IC) rules.

For EVMs not subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT,

DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer

use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing

devices pursuant to part 15 of FCC or ICES-003 rules, which are designed to provide reasonable protection against radio frequency

interference. Operation of the equipment may cause interference with radio communications, in which case the user at his own expense will

be required to take whatever measures may be required to correct this interference.

General Statement for EVMs including a radio

User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and

power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local

laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this

radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and

unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory

authorities, which is responsibility of user including its acceptable authorization.

For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant

Caution

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause

harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the

equipment.

FCC Interference Statement for Class A EVM devices

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial

environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the

instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to

cause harmful interference in which case the user will be required to correct the interference at his own expense.

FCC Interference Statement for Class B EVM devices

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.

These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment

generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause

harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If

this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and

on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

For EVMs annotated as IC – INDUSTRY CANADA Compliant

This Class A or B digital apparatus complies with Canadian ICES-003.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the

equipment.

Concerning EVMs including radio transmitters

This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this

device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired

operation of the device.

Concerning EVMs including detachable antennas

Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain

approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should

be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.

This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum

permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain

greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.

Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada.

Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de

l'utilisateur pour actionner l'équipement.

Concernant les EVMs avec appareils radio

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est

autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout

brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

Concernant les EVMs avec antennes détachables

Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain

maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à

l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente

(p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.

Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel

d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans

cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.

SPACER

【【Important Notice for Users of EVMs for RF Products in Japan】】

This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan

If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product:

1. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and

Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of

Japan,

2. Use this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this

product, or

3. Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with

respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note

that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan.

Texas Instruments Japan Limited

(address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan

http://www.tij.co.jp

【無線電波を送信する製品の開発キットをお使いになる際の注意事項】

本開発キットは技術基準適合証明を受けておりません。

本製品のご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。

1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用いただく。

2. 実験局の免許を取得後ご使用いただく。

3. 技術基準適合証明を取得後ご使用いただく。

なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。

　　　上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。

日本テキサス・インスツルメンツ株式会社

東京都新宿区西新宿６丁目２４番１号

西新宿三井ビル

http://www.tij.co.jp

SPACER

EVALUATION BOARD/KIT/MODULE (EVM)

WARNINGS, RESTRICTIONS AND DISCLAIMERS

For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished

electrical equipment and not intended for consumer use. It is intended solely for use for preliminary feasibility evaluation in

laboratory/development environments by technically qualified electronics experts who are familiar with the dangers and application risks

associated with handling electrical mechanical components, systems and subsystems. It should not be used as all or part of a finished end

product.

Your Sole Responsibility and Risk. You acknowledge, represent and agree that:

1. You have unique knowledge concerning Federal, State and local regulatory requirements (including but not limited to Food and Drug

Administration regulations, if applicable) which relate to your products and which relate to your use (and/or that of your employees,

affiliates, contractors or designees) of the EVM for evaluation, testing and other purposes.

2. You have full and exclusive responsibility to assure the safety and compliance of your products with all such laws and other applicable

regulatory requirements, and also to assure the safety of any activities to be conducted by you and/or your employees, affiliates,

contractors or designees, using the EVM. Further, you are responsible to assure that any interfaces (electronic and/or mechanical)

between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to

minimize the risk of electrical shock hazard.

3. Since the EVM is not a completed product, it may not meet all applicable regulatory and safety compliance standards (such as UL,

CSA, VDE, CE, RoHS and WEEE) which may normally be associated with similar items. You assume full responsibility to determine

and/or assure compliance with any such standards and related certifications as may be applicable. You will employ reasonable

safeguards to ensure that your use of the EVM will not result in any property damage, injury or death, even if the EVM should fail to

perform as described or expected.

4. You will take care of proper disposal and recycling of the EVM’s electronic components and packing materials.

Certain Instructions. It is important to operate this EVM within TI’s recommended specifications and environmental considerations per the

user guidelines. Exceeding the specified EVM ratings (including but not limited to input and output voltage, current, power, and

environmental ranges) may cause property damage, personal injury or death. If there are questions concerning these ratings please contact

a TI field representative prior to connecting interface electronics including input power and intended loads. Any loads applied outside of the

specified output range may result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or

interface electronics. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the

load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures

greater than 60°C as long as the input and output are maintained at a normal ambient operating temperature. These components include

but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors which can be identified using the

EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during normal operation, please

be aware that these devices may be very warm to the touch. As with all electronic evaluation tools, only qualified personnel knowledgeable

in electronic measurement and diagnostics normally found in development environments should use these EVMs.

Agreement to Defend, Indemnify and Hold Harmless. You agree to defend, indemnify and hold TI, its licensors and their representatives

harmless from and against any and all claims, damages, losses, expenses, costs and liabilities (collectively, "Claims") arising out of or in

connection with any use of the EVM that is not in accordance with the terms of the agreement. This obligation shall apply whether Claims

arise under law of tort or contract or any other legal theory, and even if the EVM fails to perform as described or expected.

Safety-Critical or Life-Critical Applications. If you intend to evaluate the components for possible use in safety critical applications (such

as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, such as devices

which are classified as FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate

Assurance and Indemnity Agreement.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other

changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest

issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and

complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale

supplied at the time of order acknowledgment.

TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms

and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary

to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily

performed.

TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and

applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide

adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or

other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information

published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or

endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the

third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration

and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered

documentation. Information of third parties may be subject to additional restrictions.

Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service

voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.

TI is not responsible or liable for any such statements.

Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements

concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support

that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which

anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause

harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use

of any TI components in safety-critical applications.

In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to

help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and

requirements. Nonetheless, such components are subject to these terms.

No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties

have executed a special agreement specifically governing such use.

Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in

military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components

which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and

regulatory requirements in connection with such use.

TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of

non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.

Products Applications

Audio www.ti.com/audio Automotive and Transportation www.ti.com/automotive

Amplifiers amplifier.ti.com Communications and Telecom www.ti.com/communications

Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers

DLP® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps

DSP dsp.ti.com Energy and Lighting www.ti.com/energy

Clocks and Timers www.ti.com/clocks Industrial www.ti.com/industrial

Interface interface.ti.com Medical www.ti.com/medical

Logic logic.ti.com Security www.ti.com/security

Power Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense

Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video

RFID www.ti-rfid.com

OMAP Applications Processors www.ti.com/omap TI E2E Community e2e.ti.com

Wireless Connectivity www.ti.com/wirelessconnectivity

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Texas Instruments:

LM34919CQSDEVM