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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LTC1626CS 데이터시트(PDF) 10 Page - Linear Technology |
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LTC1626CS 데이터시트(HTML) 10 Page - Linear Technology |
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10 / 12 page  10 LTC1626 3. Is the input decoupling capacitor (0.1 µF) connected closely between power VIN (Pins 1, 13) and power ground (Pin 12)? This capacitor carries the high fre- quency peak currents. 4. Is the Schottky diode closely connected between the power ground (Pin 12) and switch output (Pin 14)? 5. Does the LTC1626 SENSE– (Pin 7) connect to a point close to RSENSE and the (+) plate of COUT? The resistor APPLICATIONS INFORMATION + PWR VIN CIN † 47 µF 16V + COUT †† 100 µF 10V ††† FOR 3.3V: R1 = 15k, 1% R2 = 9.09k, 1% RSENSE** 0.1 Ω VOUT 2.5V 0.25A 1626 TA02 D1 MBR0520LT1 L1* 22 µH R1††† 10k 1k 3- OR 4-CELL NiCd OR NiMH * SUMIDA CDRH62-220 ** IRC 1206-R100F † AVX TPSD476K016 †† AVX TPSD107K010 3900pF R2††† 10k VIN (VIN = 2.7V TO 6V) SW LTC1626 PGND SGND SENSE+ SENSE– SHDN SHUTDOWN LBO ITH CT CT 270pF VFB LBI + 0.1 µF 1000pF 100pF R4 R3 TYPICAL APPLICATIONS Single Cell Li-Ion to 2.5V Converter + PWR VIN CIN † 47 µF 16V + COUT †† 100 µF 10V RSENSE** 0.1 Ω VOUT 2.5V 0.25A 1626 TA01 D1 MBR0520LT1 L1* 22 µH 10k 1k SINGLE Li-ION CELL * SUMIDA CDRH62-220 ** IRC 1206-R100F † AVX TPSD476K016 †† AVX TPSD107K010 3900pF 10k VIN (VIN = 2.7V TO 4.5V) SW LTC1626 PGND SGND SENSE+ SENSE– SHDN SHUTDOWN LBO ITH CT CT 270pF VFB LBI + 0.1 µF 1000pF 100pF divider R1-R2 must be connected between the (+) plate of COUT and the signal ground. 6. Are the SENSE – and SENSE+ leads routed together with minimum PC trace spacing? The 1000pF capacitor between Pin 7 and Pin 8 should be as close as possible to the LTC1626. 7. Is SHDN (Pin 10) actively pulled to ground during normal operation? The shutdown pin is high imped- ance and must not be allowed to float. 3- to 4-Cell NiCd/NiMH to 2.5V Converter |
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