LTC3613 TheELECTRICAL CHARACTERISTICS l denotes the specifications which apply over the specified operatingjunction temperature range, otherwise specifications are at T+–A = 25°C. SVIN = 15V, VFB = VOSNS – VOSNS , unless otherwise noted. (Note 4)SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITSOscillator and Clock Synchronization fOSC Free Running Switching Frequency RT = 205k 175 200 225 kHz RT = 80.6k 450 500 550 kHz RT = 38.8k 900 1000 1100 kHz CLKIH Clock Input High Level Into Mode/PLLIN 2 V CLKIL Clock Input Low Level Into Mode/PLLIN 0.5 V Internal VCC Regulator and External VCC INTVCC Internal VCC Voltage 6V < VIN < 24V 5.1 5.3 5.55 V INTVCC(%) Internal VCC Load Regulation ICC = 0mA to 50mA –1 –2 % EXTVCC(TH) EXTVCC Switchover Voltage EXTVCC Rising 4.4 4.6 4.75 V EXTVCC(HYS) EXTVCC Switchover Hysteresis 200 mV ΔINTVCC EXTVCC Voltage Drop VEXTVCC = 5V. ICC = 50mA 200 mV PGOOD Output PGDOV PGOOD Upper Threshold VFB Rising (With Respect to Regulated 5 7.5 10 % Feedback Voltage VREG) PGDUV PGOOD Lower Threshold VFB Falling (With Respect to Regulated –10 –7.5 –5 % Feedback Voltage VREG) PGDHYS PGOOD Hysteresis VFB Returning 2 % VPGD(LO) PGOOD Low Voltage IPGOOD = 5mA 0.15 0.4 V tPGD(FALL) Delay from OV/UV Fault to PGOOD Falling (Note 5) 20 μs tPGD(RISE) Delay from OV/UV Recovery to PGOOD Rising (Note 5) 10 μs RDS(ON) RDS(ON) Top Switch On-Resistance 7.5 mohm Bottom Switch On-Resistance 5.5 mohm Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 4: The LTC3613 is tested under pulsed load conditions such that cause permanent damage to the device. Exposure to any Absolute TJ ≈ TA. The LTC3613E is guaranteed to meet specifications from Maximum Rating condition for extended periods may affect device 0°C to 125°C junction temperature. Specifications over the –40°C to reliability and lifetime. 125°C operating junction temperature range are assured by design, Note 2: T characterization and correlation with statistical process controls. The J is calculated from the ambient temperature, TA, and power dissipation, P LTC3613I is guaranteed over the full –40°C to 125°C operating junction D, as follows: T temperature range. Note that the maximum ambient temperature J = TA + (PD • 29°C/W) (θJA is simulated per JESD51-7 high effective thermal conductivity test board) consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the rated package thermal θJC =1°C/W (θJC is simulated when heat sink is applied at the bottom impedance and other environmental factors. of the package.) Note 5: Delay times are measured using 50% levels. Note 3: The LTC3613 is tested in a feedback loop that adjusts V + FB = VOSNS – V – OSNS to achieve a specified error amplifier output voltage (ITH). 3613fa 4
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