Datasheet LT3437 (Analog Devices) - 3

LT3437
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the –40
°
C to 125
°
C temperature range, otherwise specifications are at TJ = 25
°
C. VIN = 12V, SHDN = 12V, BIAS = 5V, FB = 1.25V, CSS/SYNC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IVIN Supply Quiescent Current BIAS = 0V, FB = 1.15V, VC = 0.8V, SYNC = 2V 1.35 2 mA BIAS = 5V, FB = 1.15V, VC = 0.8V, SYNC = 2V 0.475 1 mA Minimum BIAS Voltage (Note 5) 2.7 3.15 V IBIASS BIAS Sleep Current (Note 4) ● 110 180 µA IBIAS BIAS Quiescent Current SYNC = 2V 0.75 1 mA Minimum Boost Voltage (Note 6) ISW = 500mA 1.8 2.5 V Input Boost Current (Note 7) ISW = 0.5A 11 16 mA ISW = 0.25A 8 13 mA VREF Reference Voltage (VREF) 3.3V < VVIN < 80V ● 1.225 1.25 1.275 V IFB FB Input Bias Current 50 200 nA EA Voltage Gain (Note 8) 900 V/V EA Voltage gm dI(VC)= ±10µA 650 µMho EA Source Current FB = 1.15V 15 35 55 µA EA Sink Current FB = 1.35V 15 30 55 µA VC to SW gm 1 A/V VC Switching Threshold VSYNC = 2V 500 mV VC High Clamp 1.5 1.75 2.1 V IPK SW Current Limit ● 500 650 900 mA SW VCESAT Switch Saturation Voltage ISW = 250mA ● 200 400 mV (Note 9) ISW = 500mA ● 400 800 mV Switching Frequency ● 165 200 240 kHz Maximum Duty Cycle 95 % Minimum SYNC Amplitude 1.5 2 V SYNC Frequency Range 240 700 kHz SYNC Input Impedance 50 kΩ ICSS CSS Current Threshold (Note 10) FB = 0V 4 10 16 µA
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the –40
°
C to 140
°
C temperature range, otherwise specifications are at TJ = 25
°
C. VIN = 12V, SHDN = 12V, BIAS = 5V, FB = 1.25V, CSS/SYNC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VSHDN SHDN Threshold ● 1.1 1.3 1.5 V ISHDN SHDN Input Current SHDN = 12V ● 5 30 µA Minimum Input Voltage (Note 3) ● 2.5 3.5 V IVINS Supply Shutdown Current SHDN = 0V, BOOST = 0V, FB/PGFB = 0V, BIAS = 0V 0.1 2 µA Supply Sleep Current (Note 4) BIAS = 0V, FB = 1.35V ● 150 300 µA FB = 1.35V ● 45 75 µA 3437fc 3