Datasheet LTC3618 (Analog Devices) - 3

LTC3618
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), SVIN = PVINx = 3.3V, RT = 178k, 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 1.8 V SVIN Ramping Up 2.2 V OVLO Overvoltage Lockout Threshold SVIN Ramping Down 6.2 V Hysteresis 300 mV VFB1 VDDQ Feedback Voltage Internal (Note 3) VTRACK/SS1 = SVIN Reference with Line and Load 0°C < TJ < 85°C 0.592 0.6 0.608 V Regulation –40°C < TJ < 125°C l 0.590 0.610 V Feedback Voltage External Reference (Note 3) VTRACK/SS1 = 0.3V 0.289 0.3 0.311 V (Note 6) (Note 3) VTRACK/SS1 = 0.5V 0.489 0.5 0.511 V VFB2 VTT Feedback Reference Voltage with VDDQIN = 1.5V l VTTR – 6 VTTR VTTR + 6 mV Line and Load Regulation VTTR VTTR Output Voltage with Line and VDDQIN = 1.5V, ILOAD = ±10mA, l 0.49 • VDDQ 0.5 • VDDQ 0.51 • VDDQ V Load Regulation CLOAD = < 0.1µF IFB Feedback Input Current VFBx = 0.6V l 0 ±30 nA VTTR Maximum Output Current ±10 mA IS Input Supply Current, Active Mode VFB1 = 0.5V, VMODE = SVIN, VRUN1 = SVIN, 2.4 mA VRUN2 = 0V, (Note 5) VFBx = 0.5V, VMODE = SVIN, VRUNx = SVIN, 2.8 mA (Note 5) Input Supply Current, Shutdown SVIN = PVIN = 5.5V, VRUNx = 0V 0.1 1 µA RDS(ON) Top Switch On-Resistance PVINx = 3.3V (Note 9) 75 mΩ Bottom Switch On-Resistance PVINx = 3.3V (Note 9) 55 mΩ ILIMX Peak Current Limit Positive Limit Sourcing (Note 7), VFBX = 0.5V 4.2 5.5 8.0 A Negative Limit Sinking (Note 7), VFBX = 0.7V –2.5 –3.5 –5.5 A 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 IEAO Error Amplifier Output Current (Note 4) ±30 µA tSOFT-START1 VDDQ Internal Soft-Start Time VFB1 from 0.06V to 0.54V, 0.5 1.1 2 ms TRACK/SS1 = SVIN tSOFT-START2 VTT Internal Soft-Start Time VFB2 from 0V to 0.75V 0.25 0.6 1 ms RON(TRACK/SS1_DIS) TRACK/SS1 Pull-Down Resistance 200 Ω at Start-Up tTRACK/SS1_DIS Soft-Start Discharge Time at Start-Up 65 µs fOSC Oscillator Frequency RRT = 178k l 1.85 2.25 2.65 MHz Internal Default Oscillator Frequency VRT = SVIN l 1.8 2.25 2.7 MHz fSYNC Synchronization Frequency tLOW , tHIGH > 30ns 0.4 4 MHz VMODE/SYNC SYNC Level High Voltage 1.2 V SYNC Level Low Voltage 0.3 V jSW1–SW2 Output Phase Shift Between SW1 VPHASE < 0.15 • SVIN 0 Deg and SW2 0.35 • SVIN < VPHASE < 0.65 • SVIN 90 Deg VPHASE > 0.85 • SVIN 180 Deg 3618fc For more information www.linear.com/LTC3618 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