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LT1308A Datasheet(PDF) 2 Page - Linear Technology |
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LT1308A Datasheet(HTML) 2 Page - Linear Technology |
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2 / 12 page  2 LT1308A/LT1308B A G A U A R BSOLUTEXI TI S ORDER PART NUMBER PACKAGE/ORDER I FOR ATIO ELECTRICAL C C HARA TERISTICS (Note 1) VIN, SHDN, LBO Voltage ......................................... 10V SW Voltage ............................................... – 0.4V to 36V FB Voltage ....................................................... VIN + 1V VC Voltage ................................................................ 2V LBI Voltage ................................................. – 0.1V to 1V Current into FB Pin .............................................. ±1mA S8 PART MARKING LT1308ACS8 LT1308AIS8 LT1308BCS8 LT1308BIS8 The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. Commercial Grade 0 °C to 70°C. VIN = 1.1V, VSHDN = VIN, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IQ Quiescent Current Not Switching, LT1308A 140 240 µA Switching, LT1308B 2.5 4 mA VSHDN = 0V (LT1308A/LT1308B) 0.01 1 µA VFB Feedback Voltage q 1.20 1.22 1.24 V IB FB Pin Bias Current (Note 3) q 27 80 nA Reference Line Regulation 1.1V ≤ VIN ≤ 2V q 0.03 0.4 %/V 2V ≤ VIN ≤ 10V 0.01 0.2 %/V Minimum Input Voltage 0.92 1 V gm Error Amp Transconductance ∆I = 5µA60 µmhos AV Error Amp Voltage Gain 100 V/V fOSC Switching Frequency VIN = 1.2V q 500 600 700 kHz Maximum Duty Cycle q 82 90 % Switch Current Limit Duty Cyle = 30% (Note 4) 2 3 4.5 A Switch VCESAT ISW = 2A (25°C, 0°C), VIN = 1.5V 290 350 mV ISW = 2A (70°C), VIN = 1.5V 330 400 mV Burst Mode Operation Switch Current Limit VIN = 2.5V, Circuit of Figure 1 400 mA (LT1308A) TJMAX = 125°C, θJA = 80°C/W 1308B 1308BI 1308A 1308AI Consult factory for Military grade parts. 1 2 3 4 8 7 6 5 TOP VIEW LBO LBI VIN SW VC FB SHDN GND S8 PACKAGE 8-LEAD PLASTIC SO Operating Temperature Range Commercial ............................................ 0 °C to 70°C Extended Commerial (Note 2) ........... – 40 °C to 85°C Industrial ........................................... – 40 °C to 85°C Storage Temperature Range ................ – 65 °C to 150°C Lead Temperature (Soldering, 10 sec)................. 300 °C ORDER PART NUMBER LT1308ACF LT1308BCF TJMAX = 125°C, θJA = 80°C/W F PACKAGE 14-LEAD PLASTIC TSSOP 1 2 3 4 5 6 7 TOP VIEW 14 13 12 11 10 9 8 VC FB SHDN GND GND GND GND LBO LBI VIN VIN SW SW SW (Note 6) |
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