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LT3990IMS Datasheet(PDF) 3 Page - Linear Technology |
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LT3990IMS Datasheet(HTML) 3 Page - Linear Technology |
3 / 20 page LT3990 3 3990p ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3990E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization, and correlation with statistical process controls. The LT3990I is guaranteed over the full –40°C to 125°C operating junction temperature range. The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBD = 3.3V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage l 4 4.2 V Quiescent Current from VIN VEN Low VEN High VEN High l 0.7 1.7 0.98 2.7 3.5 μA μA μA Feedback Voltage l 1.195 1.185 1.21 1.21 1.225 1.235 V V FB Pin Bias Current (Note 3) l 0.1 20 nA FB Voltage Line Regulation 4.2V < VIN < 60V 0.0002 0.01 %/V Switching Frequency RT = 41.2k, VIN = 6V RT = 158k, VIN = 6V RT = 768k, VIN = 6V 1.76 640 160 2.25 800 200 2.64 960 240 MHz kHz kHz Switch Current Limit VIN = 5V, VFB = 0V 535 700 865 mA Catch Schottky Current Limit VIN = 5V 350 400 500 mA Switch VCESAT ISW = 200mA 300 mV Switch Leakage Current 0.05 2 μA Catch Schottky Forward Voltage ISCH = 100mA, VIN = VBD = NC 650 mV Catch Schottky Reverse Leakage VSW = 12V 0.05 2 μA Boost Schottky Forward Voltage ISCH = 50mA, VIN = NC, VBOOST = 0V 875 mV Boost Schottky Reverse Leakage VREVERSE = 12V 0.02 2 μA Minimum Boost Voltage (Note 4) VIN = 5V l 1.4 1.8 V BOOST Pin Current ISW = 200mA, VBOOST = 15V 5.5 8 mA EN Pin Current VEN = 12V 1 30 nA EN Voltage Threshold EN Rising, VIN ≥ 4.2V l 0.95 1 1.05 V EN Voltage Hysteresis 30 mV PG Threshold Offset from Feedback Voltage VFB Rising 80 120 160 mV PG Hysteresis 12 mV PG Leakage VPG = 3V 0.01 1 μA PG Sink Current VPG = 0.4V l 40 80 μA Minimum Switch On-Time 90 ns Minimum Switch Off-Time VIN = 10V l 100 160 ns Note 3: Bias current flows into the FB pin. Note 4: This is the minimum voltage across the boost capacitor needed to guarantee full saturation of the switch. |
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