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LT1681ISW Datasheet(PDF) 2 Page - Linear Technology |
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LT1681ISW Datasheet(HTML) 2 Page - Linear Technology |
2 / 20 page 2 LT1681 1681f Supply Voltages Power Supply (VCC)............................. – 0.3V to 20V Topside Supply (VBST)................... VBSTREF – 0.3V to VBSTREF + 20V (VBST(MAX) = 90V) Topside Reference Pin (VBSTREF).......... – 0.6V to 75V Input Voltages SHDN Pin .................................. – 0.3V to VCC + 0.3V All Other Inputs ..................... – 0.3V to 5VREF + 0.3V Maximum Currents 5VREF Pin ........................................ – 85mA to 10mA FSET Pin ............................................. – 2mA to 5mA All Other Inputs .................................. – 2mA to 2mA Operating Ambient Temperature Range LT1681E (Note 4) .............................. – 40 °C to 85°C LT1681I ............................................. – 40 °C to 85°C Storage Temperature Range ................ – 65 °C to 150°C Lead Temperature (Soldering, 10 sec)................. 300 °C (Note 1) ORDER PART NUMBER LT1681ESW LT1681ISW TJMAX = 125°C, θJA = 85°C/ W The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VCC = VBST = 12V, VBSTREF = 0V, VVC = 2V, VFB = VREF = 1.25V, CTG = CBG = CSG = 1000pF. ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION ELECTRICAL CHARACTERISTICS 1 2 3 4 5 6 7 8 9 10 TOP VIEW SW PACKAGE 20-LEAD PLASTIC SO 20 19 18 17 16 15 14 13 12 11 SHDN OVLO THERM SGND 5VREF FSET SYNC SS VFB VC VBST TG BSTREF BLKSENS BG PWRGND VCC SG IMAX SENSE SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supply and Protection VCC Operating Supply Voltage Range q 912 18 V ICC DC Active Supply Current (Note 2) 17 22 mA q 25 mA DC Active UVL Supply Current VSHDN > 1.35V, VCC = 8V q 800 1200 µA DC Standby Supply Current VSHDN < 0.3V 0.5 µA IBST DC Active Supply Current TG Logic High (Note 2) q 5 8.5 mA DC Standby Supply Current VSHDN < 0.3V 0.1 µA VSHDN Shutdown Rising Threshold q 1.15 1.25 1.35 V Shutdown Threshold Hysteresis q 100 150 200 mV ISS Soft-Start Charge Current VSS = 2V q –14 – 10 – 6 µA VSS Soft-Start Reset Threshold 225 mV VCCUVLO Undervoltage Lockout Threshold Falling Edge q 8.0 8.40 8.60 V Rising Edge q 8.3 8.75 8.95 V Undervoltage Lockout Hysteresis q 0.25 0.35 V VBSTUVLO Boost Undervoltage Lockout Falling Edge q 5.7 6.4 7.1 V (VBST-BSTREF) Rising Edge q 6.5 7.0 7.5 V Boost UVLO Hysteresis q 0.3 0.6 V Consult LTC Marketing for parts specified with wider operating temperature ranges. |
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