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LTC3675EUFFPBF Datasheet(PDF) 4 Page - Linear Technology |
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LTC3675EUFFPBF Datasheet(HTML) 4 Page - Linear Technology |
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4 / 36 page  LTC3675 4 3675f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Input Supply Range l 2.7 5.5 V VIN_FALLING Falling Undervoltage Threshold l 2.35 2.45 2.55 V VIN_RISING Rising Undervoltage Threshold l 2.45 2.55 2.65 V VIN_WARN Falling Undervoltage Warning Threshold UV[2], UV[1], UV[0] = 000 2.7 V UV[2], UV[1], UV[0] = 001 2.8 V UV[2], UV[1], UV[0] = 010 2.9 V UV[2], UV[1], UV[0] = 011 3.0 V UV[2], UV[1], UV[0] = 100 3.1 V UV[2], UV[1], UV[0] = 101 3.2 V UV[2], UV[1], UV[0] = 110 3.3 V UV[2], UV[1], UV[0] = 111 3.4 V VIN_HYS VIN Undervoltage Warning Hysteresis 50 mV VIN_WARN(LSB) Undervoltage Warning Threshold Step Size l 85 100 115 mV OT Overtemperature Shutdown 150 °C OT_WARN Overtemperature Warning Threshold; Die Temperature Below OT that Causes IRQB = 0 OT[1], OT[0] = 00 OT[1], OT[0] = 01 OT[1], OT[0] = 10 OT[1], OT[0] = 11 10 20 30 40 °C °C °C °C IVIN_ALLOFF Input Supply Current All Switching Regulators and LED Driver in Shutdown, ONB = HIGH; Sum of All VIN Currents 16 28 μA fOSC Voltage Regulator Switching Frequency All Voltage Regulators l 1.8 2.25 2.7 MHz VPGOOD(RISE) Rising PGOOD Threshold Voltage Full-Scale (1,1,1,1) Reference Voltage 93.5 % VPGOOD(HYS) PGOOD Hysteresis All Regulators Except LED Driver 1 % 1A Buck Regulator (Buck Regulators 1 and 2) IVIN1,2 Pulse-Skipping Input Current Burst Mode ® Operation Input Current VFB1 = VFB2 = 0.85V (Notes 4, 5) VFB1 = VFB2 = 0.85V (Notes 4, 5) 105 20 200 50 μA μA IFWD1,2 PMOS Current Limit (Note 6) 2.25 2.8 3.35 A VFB1,2(HIGH) Feedback Regulation Voltage Pulse-Skipping Mode Full-Scale (1,1,1,1) l 780 800 820 mV VFB1,2(LOW) Feedback Regulation Voltage Pulse-Skipping Mode Full-Scale (0,0,0,0) l 405 425 445 mV VLSB1,2 FB1, FB2 Regulation Voltage Step Size 25 mV IFB12 Feedback Leakage Current VFB1= VFB2 = 0.85V –50 50 nA DMAX1,2 Maximum Duty Cycle VFB1= VFB2 = 0V l 100 % RPMOS1,2 PMOS On-Resistance ISW1 = ISW2 = 100mA 265 mΩ RNMOS1,2 NMOS On-Resistance ISW1 = ISW2 = –100mA 280 mΩ ILEAKP1,2 PMOS Leakage Current EN1 = EN2 = 0 –2 2 μA ILEAKN1,2 NMOS Leakage Current EN1 = EN2 = 0 –2 2 μA RSWPD1,2 Output Pull-Down Resistance in Shutdown EN1 = EN2 = 0 (I2C Bit Set) 10 kΩ tSS1,2 Soft-Start Time 500 μs 500mA Buck Regulator (Buck Regulators 3 and 4) IVIN3,4 Pulse-Skipping Input Current Burst Mode Operation Input Current VFB3 = VFB4 = 0.85V (Notes 4, 5) VFB3 = VFB4 = 0.85V (Notes 4, 5) 105 20 200 50 μA μA IFWD3,4 PMOS Current Limit (Note 6) 0.75 1.2 1.65 A |
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