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LTC1471 Datasheet(PDF) 8 Page - Linear Technology |
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LTC1471 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LTC1470/LTC1471 14701fa APPLICATIONS INFORMATION TOTAL SYSTEM COST CONSIDERATIONS The cost of an additional step-up switching regulator, induc- tor, rectifier and capacitors to produce 12V for VPP can be eliminated by using an auxiliary winding on either the 3.3V or 5V output of the system switching regulator to produce an auxiliary 15V supply for VPP power. And, because the LTC1470/LTC1471 do not require 12V power to operate (only 5V), the 12V VPP regulation and switching may be operated separately from the 3.3V/5V VCC switching. This increases system configuration flexibility and reduces total system cost by eliminating the need for a third regulator for 12V power. LTC1142HV Auxiliary Winding Power Supply Figure 3 is a schematic diagram which describes how a loosely regulated 15V power supply is created by adding an auxiliary winding to the 5V inductor in a split 3.3V/5V LTC1142HV power supply system. An LT1313, dual VPP regulator/driver with SafeSlot protection, produces “clean” 3.3V, 5V and 12V power from this loosely regulated 15V output for the PC card slot VPP pins. (See LT1312 and LT1313 data sheets for further detail.) A turns ratio of 1:1.8 is used for transformer T1 to ensure that the input voltage to the LT1313 falls between 13V and 20V under all load conditions. The 9V output from this additional Figure 3. Cost Effective Complete SafeSlot Dual PCMCIA Power Management System (with 15V Auxiliary Supply from LTC1142HV 5V Regulator Inductor) + 10 9 20 15 14 BVPPEN0 Q4 2N7002 R3 18k C2 1000pF C1 68 µF C3 220 µF C5 22 µF 1 µF 0.1 µF 10k 0.1 µF 1 µF 1 µF TANT 1 µF TANT VS A3VIN A3VIN LTC1471 B3VIN B3VIN (15V) VS 5V OUTPUT 3.3V 5V T1* 30 µH * LPE-6562-A026 DALE (605) 665-9301 R5 0.033 Ω Q1 Q2 R1 100 Ω R4 22 Ω C4 1000pF D2 MBRS140 D3 MBRS130T3 D1 MBRS140 1.8:1 VIN 6.5V TO 18V Q3 2N7002 AVPPEN0 R2 100 Ω + + + AVPPEN0 AVPPEN1 AVALID AEN0 AEN1 AVALID BVPPEN0 BVPPEN1 BVALID AVCCEN0 AVCCEN1 BVCCEN0 BVCCEN1 AEN0 AEN1 BEN0 BEN1 AOUT AOUT BOUT BOUT A5VIN B5VIN BEN0 BEN1 BVALID ASENSE BVPPOUT AVPPOUT BSENSE FROM “A” VCC PINS FROM “B” VCC PINS TO “A” SLOT VPP PINS TO “A” SLOT VCC PINS TO “B” SLOT VPP PINS LT1313 GND GND 1470/71 F03 GND GND + TO “B” SLOT VCC PINS + + 10k VIN PDRIVE NDRIVE SENSE+ SENSE– 1/2 LTC1142HV (5V REG) |
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