Linear LT1317 Demo Manual Download Page 11

11

DEMO MANUAL DC194

MICROPOWER BOOST REGULATOR

PCB LAYOUT A  D FIL

U

W

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

DC194 TL

Top Layer

DC194 BL

Bottom Layer

Summary of Contents for LT1317

Page 1: ...of logic supplies such as 3 3V to 5V conversion in PC card devices The LT1317 and LT1317B are 600kHz PWM DC DC con verters Theirhighoperatingfrequencyandsmallpackage DESCRIPTIO U PARAMETER CONDITIONS...

Page 2: ...1 2 0 2 5 3 0 600 500 400 300 200 100 VOUT 3 3V TYPICAL MINIMUM LT1317B Efficiency Load Current vs Input Voltage Load Current vs Input Voltage Figure 1 Demo Board Schematic 1 2 3 4 VC FB SHDN GND 8 7...

Page 3: ...onal 3 CR18 XXXJ T XXX 1 8W 5 1206 Resistor TAD 714 255 9123 JP1 1 3801S 03 G1 3 Pin Header 0 1 Center Comm 626 301 4200 1 CCIJ230 G SHUNT FOR JP1 Comm 626 301 4200 U1 1 LT1317CMS8 MSOP LTHA DC DC Con...

Page 4: ...and GND terminals of the DC194 using a bench top supply with a 1A current limit Because the SHDN pin of the LT1317 has been left floating the LT1317 will begin operating as soon as VIN is above 1 5V...

Page 5: ...down mode is typically 25 A How ever the load can draw additional current through the inductor and catch diode raising the power consumption in shutdown The LT1317 s low battery detector remains activ...

Page 6: ...be floating in order to avoid ground loops OPERATIO U DESIGN ALTERNATIVES Component Selection The components used for the DC194 represent a compro miseincost performanceandsize Theyarewellmatched for...

Page 7: ...e output voltage and output capacitor types However the loop response can be optimized further once the power components have been chosen Figure 4 shows the tran sientresponseoftheDC194 theuppertracei...

Page 8: ...rally suffers with reduced output capacitance This is especially true with the LT1317 in Burst Mode operation when the load changes from a very low current 100 A to a higher current Low Battery Detect...

Page 9: ...BO SHDN 1M 1 00M 86 6k 10M b Figure 7 Here Are Two Applications of the Low Battery Detector In a It Is Used to Sense the Battery Voltage and Trips when VIN Falls Below 1 75V In b It Is Used as an Unde...

Page 10: ...10 DEMO MANUAL DC194 MICROPOWER BOOST REGULATOR PCB LAYOUT A D FIL U W DC194 TSLK DC194 TSP DC194 TSM DC194 BSM Solder Mask Top Solder Mask Bottom Solder Paste Top Silkscreen Top...

Page 11: ...ar Technology Corporation is believed to be accurate and reliable However no responsibility is assumed for its use Linear Technology Corporation makes no represen tationthattheinterconnectionofitscirc...

Page 12: ...IED 1 MATERIAL FR4 OR EQUIVALENT EPOXY 2 OZ COPPER CLAD THICKNESS 0 062 0 006 TOTAL OF 2 LAYERS 2 FINISH ALL PLATED HOLES 0 001 MIN 0 0015 MAX COPPER PLATE ELECTRODEPOSITED TIN LEAD COMPOSTION BEFORE...

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