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LT1738EG Datasheet(PDF) 3 Page - Linear Technology |
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LT1738EG Datasheet(HTML) 3 Page - Linear Technology |
3 / 20 page 3 LT1738 1738fa ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VC = 0.9V, VFB = VREF, RVSL, RCSL = 16.9k, RT = 16.9k and other pins open unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Supply current specification includes loads on each gate as in Figure 1a. Actual supply currents vary with operating frequency, operating voltages, V5 load, slew rates and type of external FET. Note 3: The LT1738E is guaranteed to meet performance specifications from 0 °C to 70°C. Specifications from –40°C to 125°C are assured by Oscillator and Sync fMAX Max Switch Frequency 250 kHz fSYNC Synchronization Frequency Range Oscillator Frequency = 250kHz 290 kHz VSYNC SYNC Pin Input Threshold q 0.7 1.4 2 RSYNC SYNC Pin Input Resistance 40 k Ω Gate Drive DCMAX Maximum Switch Duty Cycle RVSL = RCSL = 3.9k, q 90 93.5 % Osc Frequency = 25kHz VGON Gate On Voltage VIN = 12, GCL = 12 10 10.4 10.7 V VIN = 12, GCL = 8 7.6 7.9 8.1 V VGOFF Gate Off Voltage VIN = 12V 0.2 0.35 V IGSO Max Gate Source Current VIN = 12V 0.3 A IGSK Max Gate Sink Current VIN = 12V 0.3 A VINUVLO Gate Drive Undervoltage Lockout (Note 5) VGCL = 6.5V 7.3 7.5 V Current Sense tIBL Switch Current Limit Blanking Time 100 ns VSENSE Sense Voltage Shutdown Voltage VC Pulled Low q 86 103 120 mV VSENSEF Sense Voltage Fault Threshold 220 300 mV Slew Control for the Following Slew Tests See Test Circuit in Figure 1b VSLEWR Output Voltage Slew Rising Edge RVSL = RCSL = 17k 26 V/ µs VSLEWF Output Voltage Slew Falling Edge RVSL = RCSL = 17k 19 V/ µs VISLEWR Output Current Slew Rising Edge (CS pin V) RVSL = RCSL = 17k 2.1 V/ µs VISLEWF Output Current Slew Falling Edge (CS pin V) RVSL = RCSL = 17k 2.1 V/ µs Supply and Protection VINMIN Minimum Input Voltage (Note 4) VGCL = VIN q 2.55 3.6 V IVIN Supply Current (Note 3) RVSL = RCSL = 17k VIN = 12 q 12 40 mA RVSL = RCSL = 17k VIN = 20 35 55 mA VSHDN Shutdown Turn-On Threshold q 1.31 1.39 1.48 V ∆VSHDN Shutdown Turn-On Voltage Hysteresis q 50 110 180 mV ISHDN Shutdown Input Current Hysteresis q 10 24 35 µA V5 5V Reference Voltage 6.5V ≤ VIN ≤ 20V, IV5 = 5mA 4.85 5 5.20 V 6.5V ≤ VIN ≤ 20V, IV5 = –5mA 4.80 5 5.15 V IV5SC 5V Reference Short-Circuit Current VIN = 6.5V Source 10 mA VIN = 6.5V Sink –10 mA design, characterization and correlation with statistical process controls.The LT1738I is guaranteed and tested to meet performance specifications from – 40 °C to 125°C. Note 4: Output gate drive is enabled at this voltage. The GCL voltage will also determine driver activity. Note 5: Gate drive is ensured to be on when VIN is greater than max value. |
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