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 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...
