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LT1766 Datasheet(PDF) 4 Page - Linear Technology |
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LT1766 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 30 page  LT1766/LT1766-5 4 1766fc PARAMETER CONDITIONS MIN TYP MAX UNITS Reference Voltage (VREF) 5.5V ≤ VIN ≤ 60V VOL + 0.2 ≤ VC ≤ VOH – 0.2 l 1.204 1.175 1.219 1.234 1.265 V V FB Input Bias Current l –0.5 –1.5 μA Error Amp Voltage Gain (Notes 2, 9) 200 400 V/V Error Amp gm dl (VC) = ±10μA (Note 9) l 1500 900 2000 3000 4200 μMho μMho VC to Switch gm 1.7 A/V EA Source Current FB = 1V or VSENSE = 4.1V l 125 225 400 μA EA Sink Current FB = 1.4V or VSENSE = 5.7V l 100 225 450 μA VC Switching Threshold Duty Cycle = 0 0.9 V VC High Clamp SHDN = 1V 2.1 V Switch Current Limit VC Open, Boost = VIN + 5V, FB = 1V or VSENSE = 4.1V l 0.75 2 3 A Switch On Resistance ISW = 0.75A, Boost = VIN + 5V (Note 7) l 0.2 0.3 0.8 Ω Ω Maximum Switch Duty Cycle FB = 1V or VSENSE = 4.1V l 93 90 96 % % Switch Frequency VC Set to Give DC = 50% l 184 135 200 200 216 228 kHz kHz (LT1766H Grade) The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VIN = 15V, VC = 1.5V, SHDN = 1V, BOOST open circuit, SW open circuit, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Switch On-Resistance ISW = 1.5A, Boost = VIN + 5V (Note 7) l 0.2 0.3 0.4 Ω Ω Maximum Switch Duty Cycle FB = 1V or VSENSE = 4.1V l 93 90 96 % % Switch Frequency VC Set to Give DC = 50% l 184 172 200 200 216 228 kHz kHz fSW Line Regulation 5.5V ≤ VIN ≤ 60V l 0.05 0.15 %/V fSW Frequency Shifting Threshold Df = 10kHz 0.8 V Minimum Input Voltage (Note 3) l 4.6 5.5 V Minimum Boost Voltage (Note 4) ISW ≤ 1.5A l 1.8 3 V Boost Current (Note 5) Boost = VIN + 5V, ISW = 0.5A Boost = VIN + 5V, ISW = 1.5A l l 12 45 25 70 mA mA Input Supply Current (IVIN) (Note 6) VBIAS = 5V 1.4 2.2 mA Bias Supply Current (IBIAS) (Note 6) VBIAS = 5V 2.9 4.2 mA Shutdown Supply Current SHDN = 0V, VIN ≤ 60V, SW = 0V, VC Open l 25 75 200 μA μA Lockout Threshold VC Open l 2.3 2.42 2.53 V Shutdown Thresholds VC Open, Shutting Down VC Open, Starting Up l l 0.15 0.25 0.37 0.45 0.6 0.6 V V Minimum SYNC Amplitude l 1.5 2.2 V SYNC Frequency Range 228 700 kHz SYNC Input Resistance 20 kΩ ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VIN = 15V, VC = 1.5V, SHDN = 1V, BOOST open circuit, SW open circuit, unless otherwise noted. (LT1766E/LT1766I Grade) |
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