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LT3501EFE Datasheet(PDF) 3 Page - Linear Technology |
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LT3501EFE Datasheet(HTML) 3 Page - Linear Technology |
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3 / 28 page  LT3501 3 3501fb 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 LT3501EFE 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 LT3501IFE is guaranteed and tested over the full –40°C to 125°C operating junction temperature range. Note 3: Minimum input voltage is defined as the voltage where internal bias lines are regulated so that the reference voltage and oscillator remain PARAMETER CONDITIONS MIN TYP MAX UNITS Error Amplifier Source Current Ch 1/2 VFB1/2 = 0.6V, VVC1/2 = 1V 10 15 25 µA Error Amplifier Sink Current Ch 1/2 VFB1/2 = 1V, VVC1/2 = 1V 15 20 30 µA Error Amplifier High Clamp Ch 1/2 VFB1/2 = 0.7V 1.75 2.0 2.25 V Error Amplifier Switching Threshold Ch 1/2 VOUT1/2 = 5V, RT/SYNC = 133k 0.5 0.7 1.0 V Soft-Start Source Current Ch 1/2 VFB1/2 = 0.6V, VSS1/2 = 0.4V ● 2.5 3.25 4 µA Soft-Start VOH Ch 1/2 VFB1/2 = 0.9V 1.9 2 2.4 V Soft-Start Sink Current Ch 1/2 VFB1/2 = 0.6V, VSS1/2 = 1V 200 600 1000 µA Soft-Start VOL Ch 1/2 VFB1/2 = 0V 50 80 125 mV Soft-Start to Feedback Offset Ch 1/2 VVC1/2 = 1V, VSS1/2 = 0.4V ● –16 0 16 mV Soft-Start Sink Current Ch 1/2 POR VSS1/2 = 0.4V (Note 4), VVC = 1V 0.5 1.5 2 mA Soft-Start POR Threshold Ch 1/2 VFB1/2 = 0V (Note 4) 55 80 105 mV Soft-Start Switching Threshold Ch 1/2 VFB1/2 = 0V 30 50 70 mV Power Good Leakage Ch 1/2 VFB1/2 = 0.9V, VPG1/2 = 25V, VVIN1/2 = 25V 0 1 µA Power Good Threshold Ch 1/2 VFB1/2 Rising, PG1/2 = 20k to 5V ● 87 90 93 % Power Good Hysteresis Ch 1/2 VFB1/2 Falling, PG1/2 = 20k to 5V 20 30 50 mV Power Good Sink Current Ch 1/2 VFB1/2 = 0.65V, VPG1/2 = 0.4V 400 800 1200 µA Power Good Shutdown Sink Current Ch 1/2 VVIN1/2 = 2V, VFB1/2 = 0V, VPG1/2 = 0.4V 10 50 100 µA RT/SYNC Reference Voltage VFB1/2 = 0.9V, IRT/SYNC = –40µA 0.93 0.975 1 V Switching Frequency RT/SYNC = 133k, VFB1/2 = 0.6V, VBST1/2 = VSW + 3V RT/SYNC = 15.4k, VFB1/2 = 0.6V, VBST1/2 = VSW + 3V 200 1.2 250 1.5 300 1.8 kHz MHz Switching Phase Angle Ch A to Ch B RT/SYNC = 133k, VFB1/2 = 0.6V, VBST1/2 = VSW + 3V 120 180 210 Deg Minimum Boost for 100% Duty Cycle Ch 1/2 VFB1/2 = 0.7V, IRT/SYNC = –35µA (Note 5), VOUT = 0V 1.7 2 V SYNC Frequency Range VBST1/2 = VSW + 3V 250 1500 kHz SYNC Switching Phase Angle Ch A to Ch B SYNC Frequency = 250kHz, VBST1/2 = VSW + 3V 120 180 210 Deg IND + VOUT Current Ch 1/2 VVOUT1/2 = 0V, VFB1/2 = 0.9V VVOUT1/2 = 5V 40 70 0 100 1 µA µA IND to VOUT Maximum Current Ch 1/2 VVOUT1/2 = 0.5V (Note 6), VFB1/2 = 0.7V, VBST1/2 = 20V VVOUT1/2 = 5V (Note 6), RT/SYNC = 133k, VBST1/2 = 20V 3.25 3.5 4 4 5 5 A A Switch Leakage Current Ch 1/2 VSW1/2 = 0V, VVIN1/2 = 25V ● 050 µA Switch Saturation Voltage Ch 1/2 ISW1/2 = 3A, VBST1/2 = 20V, VFB1/2 = 0.7V ● 250 600 mV Boost Current Ch 1/2 ISW1/2 = 3A, VBST1/2 = 20V, VFB1/2 = 0.7V 25 60 100 mA Minimum Boost Voltage Ch 1/2 ISW1/2 = 3A, VBST1/2 = 20V, VFB1/2 = 0.7V 1.4 2.5 V constant. Actual minimum input voltage to maintain a regulated output will depend upon output voltage and load current. See Applications Information. Note 4: An internal power-on reset (POR) latch is set on the positive transition of the SHDN pin through its threshold. The output of the latch activates current sources on each SS pin which typically sink 1.5mA, discharging the SS capacitor. The latch is reset when both SS pins are driven below the soft-start POR threshold or the SHDN pin is taken below its threshold. Note 5: To enhance dropout operation, the output switch will be turned off for the minimum off time only when the voltage across the boost capacitor drops below the minimum boost for 100% duty cycle threshold. The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VVIN1/2 = 15V, VBST1/2 = open, VRT/SYNC = 2V, VVOUT1/2 = open, unless otherwise specified. |
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