Datasheet LT1766, LT1766-5 (Analog Devices) - 4

LT1766/LT1766-5
ELECTRICAL CHARACTERISTICS (LT1766E/LT1766I Grade) The
l
denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations 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) 0.2 0.3 Ω l 0.4 Ω Maximum Switch Duty Cycle FB = 1V or VSENSE = 4.1V 93 96 % l 90 % Switch Frequency VC Set to Give DC = 50% 184 200 216 kHz l 172 200 228 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 l 12 25 mA Boost = VIN + 5V, ISW = 1.5A l 45 70 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 25 75 μA l 200 μA Lockout Threshold VC Open l 2.3 2.42 2.53 V Shutdown Thresholds VC Open, Shutting Down l 0.15 0.37 0.6 V VC Open, Starting Up l 0.25 0.45 0.6 V Minimum SYNC Amplitude l 1.5 2.2 V SYNC Frequency Range 228 700 kHz SYNC Input Resistance 20 kΩ
(LT1766H Grade) The
l
denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations 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
Reference Voltage (VREF) 5.5V ≤ VIN ≤ 60V 1.204 1.219 1.234 V VOL + 0.2 ≤ VC ≤ VOH – 0.2 l 1.175 1.265 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) 1500 2000 3000 μMho l 900 4200 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) 0.2 0.3 Ω l 0.8 Ω Maximum Switch Duty Cycle FB = 1V or VSENSE = 4.1V 93 96 % l 90 % Switch Frequency VC Set to Give DC = 50% 184 200 216 kHz l 135 200 228 kHz 1766fc 4