LM3668 Evaluation Board National Semiconductor Application Note 1

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

LM3668 Evaluation Board National Semiconductor Application Note 1

Datasheet Thumbnail

Top Searches for this datasheet

LM3668 Evaluation Board
LM3668 Evaluation Board
National Semiconductor Application Note 1623 Anne 2008
LM3668 evaluation board working demonstration synchronous buck-boost DC-DC converter. This application note contains information about evaluation board. more details electrical characteristics about converter operation, please refer datasheet.
Operating Range
range: 2.5V 5.5V 2.8V/3.3V 3.0V/3.4V versions: maximum load current 2.8V 5.5V -800mA maximum load current 2.7V -600mA maximum load current 2.5V 4.5V/5V version: maximum load current 3.9V 5.5V -800mA maximum load current 3.4V 3.8V -700mA maximum load current 3.0V 3.3V -600mA maximum load current 2.7V 2.9V
Package
LLP-12 no-pullback (3mm 0.8mm)
Typical Application
30018501
FIGURE Typical Application Circuit
AN-1623
2008 National Semiconductor Corporation
300185
www.national.com
AN-1623
Connection Diagrams
30018502
30018503
Note: above figures actual scale
Descriptions
Name VOUT PGND PVIN SGND MODE/SYNC Connect output capacitor. Switching Node connection internal PFET switch (P2) NFET synchronous rectifier (N2). Power Ground. Switching Node connection internal PFET switch (P1) NFET synchronous rectifier (N1). Supply power switch, connect input capacitor. Enable Input. this digital input high normal operation. shutdown, low. Signal Supply input. board layout optimum optional ceramic capacitor suggested close this possible. connect. Connect this layout. Analog Control Ground. Mode LOW, Automatic Mode. Mode= Forced Mode SYNC external clock synchronization from 1.6MHz 2.7MHz (When SYNC function used, device forced mode). Voltage selection pin; 2.8V/3.3V option) Logic input 2.8V logic high 3.3V output Voltage. Feedback Analog Input. Connect output output filter. Attach Pad, connect SGND layout enhance thermal performance. should used primary ground connection. Description
VSEL
Ordering Information
Order Number LM3668SD 2822 LM3668SDX 2833 LM3668SD 3034 LM3668SDX 3034 LM3668SD 4550 LM3668SDX 4550 Package LLP-12 LLP-12 LLP-12 Package Marking S016B S018B S019B Supplied 1000 units, Tape Reel 4500 units, Tape Reel 1000 units, Tape Reel 4500 units, Tape Reel 1000 units, Tape Reel 4500 units, Tape Reel
Note: example, VOUT option 3.0V/3.4V, when VSEL Low, VOUT when VSEL high, VOUT 3.4V. This configuration applies voltage options.
www.national.com
AN-1623
Bill Materials
Component Name LM3668SD 10µF COUT 22µF (2.8/3.3V, 3.0/3.4V) COUT 22µF (4.5/5.0V) CIN_VDD 4.7µF Inductor Coilcraft Taiyo-Yuden Manufacturer Specification LLP-12 JMK212BJ106K JK212BJ226MG LMK212BJ226MMG JMK212BJ475M LPS4018-222L Case Size 0.8mm 0805(2012) 0805(2012) 0805(2012) 0805(2012) 1.8mm
www.national.com
AN-1623
Operating Information
LM3668 evaluation board following default positions: VOUT 3.3V, VOUT 2.8V move VSEL jumper SYNC Mode (PWM Mode), Auto Mode, SYNC (move jumper inner position). leave this floating. tied jumper recommended start device with full load minimum input voltage
Evaluation Board Layout
LM3668EVB four-layer board designed maximize performance. layer consists high current path; bottom layer current logic signals path. Inner layer layer dedicated PGND (power GND) SGND (analog logic GND). optimum performance, recommended separate PGND SGND pins join them together "star GND" PCB. star traces board should close device power pin.
30018505
30018517
Layer
Inner Layer
30018518
SGND Inner Layer
30018519
Bottom Layer
www.national.com
AN-1623
Notes
www.national.com
LM3668 Evaluation Board
Notes
more National Semiconductor product information proven design tools, visit following sites
Products Amplifiers Audio Clock Conditioners Data Converters Displays Ethernet Interface LVDS Power Management Switching Regulators LDOs Lighting PowerWise Serial Digital Interface (SDI) Temperature Sensors Wireless (PLL/VCO) www.national.com/amplifiers www.national.com/audio www.national.com/timing www.national.com/adc www.national.com/displays www.national.com/ethernet www.national.com/interface www.national.com/lvds www.national.com/power www.national.com/switchers www.national.com/ldo www.national.com/led www.national.com/powerwise www.national.com/sdi www.national.com/tempsensors www.national.com/wireless WEBENCH Analog University Notes Distributors Green Compliance Packaging
Design Support www.national.com/webench www.national.com/AU www.national.com/appnotes www.national.com/contacts www.national.com/quality/green www.national.com/packaging www.national.com/quality www.national.com/refdesigns www.national.com/feedback
Quality Reliability Reference Designs Feedback
CONTENTS THIS DOCUMENT PROVIDED CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. NATIONAL MAKES REPRESENTATIONS WARRANTIES WITH RESPECT ACCURACY COMPLETENESS CONTENTS THIS PUBLICATION RESERVES RIGHT MAKE CHANGES SPECIFICATIONS PRODUCT DESCRIPTIONS TIME WITHOUT NOTICE. LICENSE, WHETHER EXPRESS, IMPLIED, ARISING ESTOPPEL OTHERWISE, INTELLECTUAL PROPERTY RIGHTS GRANTED THIS DOCUMENT. TESTING OTHER QUALITY CONTROLS USED EXTENT NATIONAL DEEMS NECESSARY SUPPORT NATIONAL'S PRODUCT WARRANTY. EXCEPT WHERE MANDATED GOVERNMENT REQUIREMENTS, TESTING PARAMETERS EACH PRODUCT NECESSARILY PERFORMED. NATIONAL ASSUMES LIABILITY APPLICATIONS ASSISTANCE BUYER PRODUCT DESIGN. BUYERS RESPONSIBLE THEIR PRODUCTS APPLICATIONS USING NATIONAL COMPONENTS. PRIOR USING DISTRIBUTING PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING OPERATING SAFEGUARDS. EXCEPT PROVIDED NATIONAL'S TERMS CONDITIONS SALE SUCH PRODUCTS, NATIONAL ASSUMES LIABILITY WHATSOEVER, NATIONAL DISCLAIMS EXPRESS IMPLIED WARRANTY RELATING SALE AND/OR NATIONAL PRODUCTS INCLUDING LIABILITY WARRANTIES RELATING FITNESS PARTICULAR PURPOSE, MERCHANTABILITY, INFRINGEMENT PATENT, COPYRIGHT OTHER INTELLECTUAL PROPERTY RIGHT. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS PRIOR WRITTEN APPROVAL CHIEF EXECUTIVE OFFICER GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices which intended surgical implant into body, support sustain life whose failure perform when properly used accordance with instructions provided labeling reasonably expected result significant injury user. critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness. National Semiconductor National Semiconductor logo registered trademarks National Semiconductor Corporation. other brand product names trademarks registered trademarks their respective holders.
Copyright© 2008 National Semiconductor Corporation
AN-1623
most current product information visit www.national.com
National Semiconductor Americas Technical Support Center Email: support@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Technical Support Center Email: europe.support@nsc.com German Tel: 5010 English Tel: 4288 National Semiconductor Asia Pacific Technical Support Center Email: ap.support@nsc.com National Semiconductor Japan Technical Support Center Email: jpn.feedback@nsc.com

LM3668 Evaluation Board National Semiconductor Application Note 1

Top Searches for this datasheet

Other recent searches