background image

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

Copyright © 2013, Texas Instruments Incorporated

Summary of Contents for LM2745-19A

Page 1: ...V to 3 3V at 19A with a switching frequency of 300 kHz Note the demo board is optimized for the above parameters thus for additional design modifications refer to the Design Consideration section of the LM2745 data sheet The PCB is designed on four layers the top and bottom layers are 2oz copper and the two inner layers are 1oz copper The board measures 2 19 in x 1 03 in x 0 41 in 56 mm x 26 2 mm ...

Page 2: ... frequency synchronize range 250 kHz to 1 MHz Current Limit Protection Master power supply start up tracking function Start up with a pre biased output load Adjustable soft start Small size 2 19 in x 1 03 in x 0 41 in 56 mm x 26 2 mm x 10 3 mm 5 Performance Characteristics Efficiency Figure 2 Efficiency vs Load Current VOUT 3 3V fSW 300 kHz 2 AN 1573 LM2745 19A Demonstration Board SNVA213A May 200...

Page 3: ...le Figure 3 VIN 8V VOUT 3 3V ILOAD 100 mA fSW 300 kHz 20 MHz Bandwidth Limit Figure 4 VIN 8V VOUT 3 3V ILOAD 19A fSW 300 kHz 20 MHz Bandwidth Limit 3 SNVA213A May 2007 Revised May 2013 AN 1573 LM2745 19A Demonstration Board Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Page 4: ...3 3V ILOAD 100 mA fSW 300 kHz 20 MHz Bandwidth Limit Figure 6 VIN 14V VOUT 3 3V ILOAD 19A fSW 300 kHz 20 MHz Bandwidth Limit 4 AN 1573 LM2745 19A Demonstration Board SNVA213A May 2007 Revised May 2013 Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Page 5: ...Transient Response Figure 7 VIN 14V VOUT 3 3V ILOAD 2A to 10A CH1 VOUT CH2 ILOAD Figure 8 VIN 14V VOUT 3 3V ILOAD 11A to 19A CH1 VOUT CH2 ILOAD 5 SNVA213A May 2007 Revised May 2013 AN 1573 LM2745 19A Demonstration Board Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Page 6: ...ti com Figure 9 VIN 8V VOUT 3 3V ILOAD 2A to 10A CH1 VOUT CH2 ILOAD Figure 10 VIN 8V VOUT 3 3V ILOAD 11A to 19A CH1 VOUT CH2 ILOAD 6 AN 1573 LM2745 19A Demonstration Board SNVA213A May 2007 Revised May 2013 Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Page 7: ... Murata C7 GRM1885C1H101JA01 Ceramic Capacitor 0603 100pF 50V C0G 5 1 Murata C8 GRM188R71H332KA01 Ceramic Capacitor 0603 3 3nF 50V X7R 10 1 Murata C10 GRM188R71H153KA01 Ceramic Capacitor 0603 15nF 50V X7R 10 1 Murata C12 GRM40X7R472K25 Ceramic Capacitor 0805 470nF 25V X7R 10 1 Murata C13 12066D226MAT Ceramic Capacitor 1206 22µF 6 3V X5R 20 1 AVX C4 5 6SVPC220M OS CON C6 220µF 6 3V 20 2 Sanyo R1 18...

Page 8: ...N C13 VOUT GND C12 D1 Q2 SD R6 R5 R7 R8 R9 R18 U1 U2 C7 SYNC R14 R13 TRACK SJ2 PWGD SD TRIM SENSE SJ1 VCC ISEN PCB Layout www ti com Figure 11 300 kHz Demo Board Schematic 9 PCB Layout Figure 12 Top Silkscreen 8 AN 1573 LM2745 19A Demonstration Board SNVA213A May 2007 Revised May 2013 Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Page 9: ... Top Copper Layer Figure 14 Bottom Silkscreen Figure 15 Bottom Copper Layer 9 SNVA213A May 2007 Revised May 2013 AN 1573 LM2745 19A Demonstration Board Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Page 10: ...e 16 Internal Layer 1 GND Copper Figure 17 Internal Layer 2 GND Copper 10 AN 1573 LM2745 19A Demonstration Board SNVA213A May 2007 Revised May 2013 Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Page 11: ...esponsible 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 failur...

Page 12: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments LM2745 19AEVAL ...

Reviews: