Datasheet LTC3615, LTC3615-1 (Analog Devices) - 3

LTC3615/LTC3615-1
e lecTrical characTerisTics The
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denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2), SVIN = PVINx = 3.3V, RT = 178k, RSRLIM = 40.2k, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operating Voltage Range l 2.25 5.5 V VUVLO Undervoltage Lockout Threshold SVIN Ramping Down l 1.7 V SVIN Ramping Up 2.25 V VFB Feedback Voltage Internal Reference (Note 3) VTRACK = SVIN, VSRLIM = 0V 0°C < TJ < 85°C 0.592 0.6 0.608 V –40°C < TJ < 125°C l 0.590 0.610 V –55°C < TJ < 150°C l 0.588 0.612 V Feedback Voltage External Reference (Note 3) VTRACK = 0.3V, VSRLIM = SVIN 0.289 0.3 0.311 V (Note 7) (Note 3) VTRACK = 0.5V, VSRLIM = SVIN 0.489 0.5 0.511 V IFB Feedback Input Current VFBx = 0.6V l 0 ±30 nA ∆VLINEREG Line Regulation SVIN = PVINx = 2.25V to 5.5V (Note 4) l 0.2 %/ V ∆VLOADREG Load Regulation VITHx from 0.5V to 0.9V (Note 4) 0.2 % VITHx = SVIN, VFBx = 0.6V (Note 5) 2 % IS Active Mode VFB1 = 0.5V, VMODE = SVIN, VRUN2 = 0V (Note 6) 1100 µA VFBx = 0.5V, VMODE = SVIN, VRUNx = SVIN (Note 1900 µA 6) Sleep Mode VFB1 = 0.7V, VRUN1 = SVIN, VRUN2 = 0V, 95 130 µA VMODE = 0V, VITH1 = SVIN (Note 5) VFBx = 0.7V, VRUN1 = SVIN, VRUN2 = 0V, 145 220 µA VMODE = 0V (Note 4) VFBx = 0.7V, VRUNx = SVIN, VMODE =0V, 130 200 µA VITHx = SVIN (Note 5) VFBx = 0.7V, VRUNx = SVIN, VMODE =0V, 240 360 µA ITH = (Note 4) Shutdown SVIN = PVIN = 5.5V, VRUNx = 0V 0.1 1 µA RDS(ON) Top Switch On-Resistance PVINx = 3.3V (Note 10) 75 mΩ Bottom Switch On-Resistance PVINx = 3.3V (Note 10) 55 mΩ ILIM Top Switch Current Limit Sourcing (Note 8), VFB = 0.5V Duty Cycle <35% 4.5 6 7.5 A Duty Cycle = 100% 3.6 A Bottom Switch Current Limit Sinking (Note 8), VFB = 0.7V, –2.5 –3.5 –5 A Forced Continuous Mode ISW(LKG) Switch Leakage Current SVIN = PVIN = 5.5V, VRUNx = 0V 0.01 1 µA gm(EA) Error Amplifier Transconductance –5µA < ITH < 5µA 240 µmho IEA Error Amplifier Output Current (Note 4) ±30 µA tSOFT-START Internal Soft-Start Time VFBx from 0.06V to 0.54V, TRACK/SSx = SVIN 0.65 1.1 1.7 ms RDIS TRACK/SS Pull-Down Resistance at 200 Ω Start-Up tDIS Soft-Start Discharge Time at Start-Up 70 µs fOSC Internal Oscillator Frequency RRT/SYNC = 178k l 1.85 2.25 2.65 MHz VRT/SYNC = SVIN l 1.8 2.25 2.7 MHz fSYNC Synchronization Frequency tLOW , tHIGH > 30ns 0.4 4 MHz VRT/SYNC SYNC Level High 1.2 V SYNC Level Low 0.3 V 3615fb For more information www.linear.com/LTC3615 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts