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CD43-4R7 数据表(PDF) 2 Page - Linear Technology |
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CD43-4R7 数据表(HTML) 2 Page - Linear Technology |
2 / 8 page 2 LT1945 1945f ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) VIN, SHDN1, SHDN2 Voltage ................................... 15V SW1, SW2 Voltage .................................................. 36V NFB1 Voltage ........................................................... –3V FB2 Voltage ...............................................................VIN Current into NFB1 Pin ........................................... –1mA Current into FB2 Pin .............................................. 1mA Junction Temperature ........................................... 125 °C Operating Temperature Range (Note 2) .. – 40 °C to 85°C Storage Temperature Range ................. – 65 °C to 150°C Lead Temperature (Soldering, 10 sec).................. 300 °C ORDER PART NUMBER LT1945EMS MS PART MARKING ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage 1.2 V Quiescent Current, (per Converter) Not Switching 20 30 µA VSHDN = 0V 1 µA NFB1 Comparator Trip Point q –1.205 –1.23 –1.255 V FB2 Comparator Trip Point q 1.205 1.23 1.255 V FB Comparator Hysteresis 8mV NFB1, FB2 Voltage Line Regulation 1.2V < VIN < 12V 0.05 0.1 %/V NFB1 Pin Bias Current (Note 3) VNFB1 = –1.23V q 1.3 2 2.9 µA FB2 Pin Bias Current (Note 4) VFB2 = 1.23V q 30 80 nA Switch Off Time, Switcher 1 (Note 5) 400 ns Switch Off Time, Switcher 2 (Note 5) VFB2 > 1V 400 ns VFB2 < 0.6V 1.5 µs Switch VCESAT ISW = 300mA 250 350 mV Switch Current Limit 250 350 400 mA SHDN Pin Current VSHDN = 1.2V 2 3 µA VSHDN = 5V 8 12 µA SHDN Input Voltage High 0.9 V SHDN Input Voltage Low 0.25 V Switch Leakage Current Switch Off, VSW = 5V 0.01 5 µA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1945 is guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 85°C operating TJMAX = 125°C, θJA = 160°C/W temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VSHDN = 1.2V unless otherwise noted. LTTS Consult LTC Marketing for parts specified with wider operating temperature ranges. 1 2 3 4 5 NFB1 SHDN1 GND SHDN2 FB2 10 9 8 7 6 SW1 PGND VIN PGND SW2 TOP VIEW MS PACKAGE 10-LEAD PLASTIC MSOP temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Bias current flows out of the NFB1 pin. Note 4: Bias current flows into the FB2 pin. Note 5: See Figure 1 for Switcher 1 and Switcher 2 locations. |
类似零件编号 - CD43-4R7 |
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类似说明 - CD43-4R7 |
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