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LT1512IS8 Datasheet(PDF) 3 Page - Linear Technology |
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LT1512IS8 Datasheet(HTML) 3 Page - Linear Technology |
3 / 12 page 3 LT1512 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VSAT Output Switch ON Resistance ISW = 2A q 0.5 0.8 Ω ILIM Switch Current Limit Duty Cycle = 50% q 1.5 1.9 2.7 A Duty Cycle = 80% (Note 1) q 1.3 1.7 2.5 A ∆IIN Supply Current Increase During Switch ON Time 15 25 mA/A ∆ISW Control Voltage to Switch Current 2A/V Transconductance Minimum Input Voltage q 2.4 2.7 V IQ Supply Current 2.7V ≤ VIN ≤ 25V q 4 5.5 mA Shutdown Supply Current 2.7V ≤ VIN ≤ 25V, VS/S ≤ 0.6V 0 °C ≤ TJ ≤ 125°C q 12 30 µA –40 °C ≤ TJ ≤ 0°C (LT1512I) 50 µA Shutdown Threshold 2.7V ≤ VIN ≤ 25V q 0.6 1.3 2 V Shutdown Delay q 512 25 µs S/S Pin Input Current 0V ≤ VS/S ≤ 5V q –10 15 µA Synchronization Frequency Range q 600 800 kHz ELECTRICAL C C HARA TERISTICS VIN = 5V, VC = 0.6V, VFB = VREF, IFB = 0V, VSW and S/S pins open, unless otherwise noted. The q denotes specifications which apply over the full operating temperature range. Note 1: For duty cycles (DC) between 50% and 85%, minimum guaranteed switch current is given by ILIM = 0.667 (2.75 – DC). Note 2: The IFB pin is servoed to its regulating state with VC = 0.8V. Note 3: Commercial devices are guaranteed over 0 °C to 125°C junction temperature range and 0 °C to 70°C ambient temperature range. These parts are also designed, characterized and expected to operate over the –20 °C to 85°C extended ambient temperature range, but are not tested at –20 °C or 85°C. Devices with full guaranteed electrical specifications over the ambient temperature range – 40 °C to 85°C are available as industrial parts with an “I” suffix. Maximum allowable ambient temperature may be limited by power dissipation. Parts may not necessarily be operated simultaneously at maximum power dissipation and maximum ambient temperature. Temperature rise calculations must be done as shown in the Applications Information section to ensure that maximum junction temperature does not exceed 125 °C limit. With high power dissipation, maximum ambient temperature may be less than 70 °C. TYPICAL PERFORMANCE CHARACTERISTICS Switch Saturation Voltage vs Switch Current Minimum Input Voltage vs Temperature Switch Current Limit vs Duty Cycle SWITCH CURRENT (A) 0 0.6 0.8 1.0 1.6 1512 G01 0.4 0.2 0.5 0.7 0.9 0.3 0.1 0 0.4 0.8 1.2 2.0 1.4 0.2 0.6 1.0 1.8 100 °C 150 °C 25 °C –55 °C DUTY CYCLE (%) 3.0 2.5 2.0 1.5 1.0 0.5 0 20 40 60 80 1512 G02 100 10 0 30 50 70 90 25 °C AND 125 °C –55 °C TEMPERATURE ( °C) –50 1.8 2.0 2.2 2.4 2.6 050 100 150 1512 G03 2.8 3.0 –25 25 75 125 |
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