Datasheet LT3992 (Analog Devices) - 3

LT3992
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VVIN1/2 = 15V unless otherwise specified. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
SHDN Voltage Threshold CH1/2 l 1.24 1.32 1.4 V SHDN Input Current CH1/2 VSHDN = 1.35V –1 0 1 µA VIN1 Undervoltage Lockout (Note 3) 2.6 2.9 3.2 V VIN1 Shutdown Current VSHDN = 0V l 6 13 µA VIN2 Shutdown Current VSHDN = 0V l 0.1 2 µA VIN1 Quiescent Current VFB1/2 = 2V 3 4.2 6 mA VIN2 Quiescent Current VFB1/2 = 2V 300 530 900 µA Feedback Voltage CH1/2 VVC1/2 = 1V l 786 806 824 mV Feedback Voltage Regulation VVIN1/2 = 4V to 60V l 780 806 830 mV Feedback Voltage Offset CH1 to CH2 VVC1/2 = 1V l –13 0 13 mV Feedback Bias Current CH1/2 VVC1/2 = 1V l 0 85 300 nA TJ Output Voltage (Note 4) TJ = 25°C, ITJ = 25µA, Temperature = 25°C 250 mV ITJ = 25µA, Temperature = 125°C 1.23 V ITJ = 25µA, Temperature = –40°C –380 mV TJ Error Temperature = 25°C to 125°C l –100 0 100 mV Error Amp gm CH1/2 VVC1/2 = 1V, IVC1/2 = ±10µA 250 350 450 µMho Error Amp Source Current CH1/2 VFB1/2 = 0.7V, VVC1/2 = 1V 15 25 40 µA Error Amp Sink Current CH1/2 VFB1/2 =0.9V, VVC1/2 = 1V 15 25 40 µA Error Amp High Clamp CH1/2 VFB1/2 = 0.7V 1.7 1.9 2.1 V Error Amp Switching Threshold CH1/2 VFB1/2 = 0V 0.8 1.0 1.2 V Soft-Start Source Current CH1/2 VFB1/2 = 2V, VSS1/2 = 0.07V l 9 13.5 17 µA Soft-Start VOH CH1/2 VFB1/2 = 2.0V 1.9 2.15 2.4 V Soft-Start Sink Current CH1/2 VFB1/2 = 0.7V, VSS1/2 = 2V 0.4 0.9 2 mA Soft-Start VOL CH1/2 VFB1/2 = 0V 130 170 210 mV Soft-Start to Feedback Offset CH1/2 VVC1/2 = 1V, VSS1/2 = 0.4V l 16 0 16 mV SS POR Threshold CH1/2 70 110 140 mV Soft-Start Sink Current CH1/2 POR VFB1/2 = 2V, VSS1/2 = 0.14V (Note 5) 150 450 600 µA Soft-Start SW Disable CH1/2 VFB1/2 = 0V (Note 5) 80 115 150 mV CMPI Bias Current CH1/2 VCMPI1/2 = 0.8V –100 0 100 nA CMPO Leakage CH1/2 VCMP1/2 = 0.8V, VCMPO1/2 = 60V 70 500 nA CMPI Threshold CH1/2 VCMPI1/2 Rising l 690 725 760 mV CMPI Threshold CH1/2 of VFB1/2 VCMPI1/2 Rising (Note 6) 86 90 94 % CMPI Hysteresis CH1/2 VCMPI1/2 50 80 105 mV CMPO Sink Current CH1/2 VCMPI1/2 = 0.6V, VCMPO1/2 = 0.2V 150 250 µA RT/SYNC Reference Current VRT/SYNC = 0.36V E- & I-Grade l 11.3 12 12.7 µA RT/SYNC Reference Current VRT/SYNC = 0.36V H-Grade l 11.2 12 13 µA Minimum Switching Frequency RRT/SYNC =0Ω 50 110 150 kHz Switching Frequency RRT/SYNC = 28k 900 1000 1100 kHz Maximum Switching Frequency RRT/SYNC =100k 2.2 2.5 3.0 MHz Switching Phase Angle CH1 ≥ CH2 185 Deg DIV Reference Current VDIV = 1V l 10.7 12 13.3 µA CH1 DIV 2 Threshold RRT/SYNC = 0V 0.44 0.5 0.56 V 3992fa For more information www.linear.com/LT3992 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 Typical Application Related Parts