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LT3756 Datasheet(PDF) 4 Page - Linear Technology |
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LT3756 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 26 page  LT3791-1 4 37911fa For more information www.linear.com/LT3791-1 elecTrical characTerisTics The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VEN/UVLO = 12V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS C/10 Rising Threshold (VFB) V(ISP-ISN) = 0V l 1.127 1.15 1.173 V C/10 Falling Threshold (VFB) l 1.078 1.1 1.122 V C/10 Falling Threshold (V(ISP-ISN)) VFB = 1.2V 5 10 15 mV SHORT Falling Threshold (VFB) 380 400 450 mV C/10 Pin Output Impedance 1.1 2.0 kΩ SHORT Pin Output Impedance 1.1 2.0 kΩ SS Latch-Off Threshold 1.75 V SS Reset Threshold 0.2 V Oscillator Switching Frequency RT = 147k RT = 59.0k RT = 29.1k 190 380 665 200 400 700 210 420 735 kHz kHz kHz SYNC Frequency 200 700 kHz SYNC Pin Resistance to GND 90 kΩ SYNC Threshold Voltage 0.3 1.5 V Internal VCC Regulator INTVCC Regulation Voltage 4.8 5 5.2 V Dropout (VIN – INTVCC) IINTVCC = –10mA, VIN = 5V 240 350 mV INTVCC Undervoltage Lockout 3.1 3.5 3.9 V INTVCC Current Limit VINTVCC = 4V 67 mA PWM PWM Threshold Voltage 0.3 1.5 V PWM Pin Resistance to GND 90 kΩ PWMOUT Pull-Up Resistance 10 20 Ω PWMOUT Pull-Down Resistance 5 10 Ω NMOS Drivers TG1, TG2 Gate Driver On-Resistance Gate Pull-Up Gate Pull-Down VBST – VSW = 5V 2.6 1.7 Ω Ω BG1, BG2 Gate Driver On-Resistance Gate Pull-Up Gate Pull-Down VINTVCC = 5V 3 1.2 Ω Ω TG Off to BG On Delay CL = 3300pF 60 ns BG Off to TG On Delay CL = 3300pF 60 ns TG1, TG2, tOFF(MIN) RT = 59.0k 240 300 ns 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 LT3791E-1 is guaranteed to meet performance from 0°C to 125°C junction temperature. Specification over the -40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3791I-1 is guaranteed to meet performance specifications over the –40°C to 125°C operating junction temperature range. The LT3791H-1 is guaranteed to meet performance specifications over the –40°C to 150°C operating junction temperature range. The LT3791MP-1 is guaranteed to meet performance specifications over the –55°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated for junction temperatures greater than 125°C. Note 3: The LT3791-1 includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed the maximum operating junction temperature when overtemperature protection is active. Continuous operation above the specified absolute maximum operating junction temperature may impair device reliability. |
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