Datasheet LT3759 (Analog Devices) - 3

LT3759
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, EN/UVLO = 12V, INTVCC = 4.75V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operating Voltage l 1.6 42 V VIN Shutdown IQ EN/UVLO < 0.4V 0.1 1 µA EN/UVLO = 1.15V 6 µA VIN Operating IQ 350 450 µA DRIVE Shutdown Quiescent Current EN/UVLO < 0.4V 0.1 1 µA EN/UVLO = 1.15V 0.1 2 µA DRIVE Quiescent Current (Not Switching) RT = 27.4kΩ, DRIVE = 6V 2.0 2.5 mA SENSE Current Limit Threshold l 46 50 54 mV SENSE Input Bias Current Current Out of Pin –55 µA
Error Amplifier
FBX Regulation Voltage (VFBX(REG)) FBX > 0V l 1.580 1.6 1.620 V FBX < 0V l –0.815 –0.80 –0.785 V FBX Pin Input Current FBX = 1.6V 60 120 nA FBX = –0.8V –10 10 nA Transconductance gm (ΔI2/ΔVFBX) FBX = VFBX(REG) 240 µs VC Output Impedance 5 MΩ FBX Line Regulation [ΔVFBX(REG)/(ΔVIN • VFBX(REG))] 1.6V < VIN < 42V, FBX >0 0.02 0.05 %/V 1.6V < VIN < 42V, FBX <0 0.02 0.05 %/V VC Current Mode Gain (ΔVVC/ΔVSENSE) 5 V/V VC Source Current FBX = 0V, VC = 1.3V –13 µA VC Sink Current FBX = 1.7V, VC = 1.3V 13 µA FBX = –0.85V, VC = 1.3V 10 µA
Oscillator
Switching Frequency RT = 27.4k to GND, VFBX = 1.6V 270 300 330 kHz RT = 86.6k to GND, VFBX = 1.6V 100 kHz RT = 6.81k to GND, VFBX = 1.6V 1000 kHz RT Voltage FBX = 1.6V, –0.8V 1.2 V GATE Minimum Off-Time 170 200 ns GATE Minimum On-Time 170 200 ns SYNC Input Low l 0.4 V SYNC Input High l 1.5 V SS Pul -Up Current SS = 0V, Current Out of Pin l –14 –10.5 –7 µA
Low Dropout Regulators (DRIVE LDO and VIN LDO)
DRIVE LDO Regulation Voltage DRIVE = 6V l 4.6 4.75 4.9 V VIN LDO Regulation Voltage DRIVE = 0V l 3.6 3.75 3.9 V DRIVE LDO Current Limit INTVCC = 4V 60 mA VIN LDO Current Limit DRIVE = 0V, INTVCC = 3V 60 mA DRIVE LDO Load Regulation (ΔVINTVCC/VINTVCC) 0 < IINTVCC < 20mA, DRIVE = 6V –1 –0.6 % VIN LDO Load Regulation (ΔVINTVCC/VINTVCC) DRIVE = 0V, 0 < IINTVCC < 20mA –1 –0.6 % DRIVE LDO Line Regulation [ΔVINTVCC/(VINTVCC • ΔVIN)] 1.6V < VIN < 42V, DRIVE = 6V 0.03 0.07 %/V VIN LDO Line Regulation [ΔVINTVCC/(VINTVCC • ΔVIN)] DRIVE = 0V, 5V < VIN < 42V 0.03 0.07 %/V DRIVE LDO Dropout Voltage (VDRIVE – VINTVcc) DRIVE = 4V, IINTVCC = 20mA l 190 400 mV 3759fc For more information www.linear.com/3759 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Related Parts