Datasheet LTC3851A (Analog Devices) - 3

LTC3851A
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
VIN Operating Input Voltage Range l 4 38 V VFB Regulated Feedback Voltage ITH = 1.2V (Note 4) 0°C to 85°C l 0.792 0.800 0.808 V ITH = 1.2V (Note 4) –40°C to 125°C l 0.788 0.812 V ITH = 1.2V (Note 4) –40°C to 150°C l 0.788 0.812 V ITH = 1.2V (Note 4) –55°C to 150°C l 0.788 0.812 V IFB Feedback Current (Note 4) –10 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 6V to 38V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 0.7V l 0.01 0.1 % (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 0.7V (H-Grade, MP-Grade) l 0.2 % (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 1.6V l –0.01 –0.1 % (Note 4) Measured in Servo Loop, ∆ITH = 1.2V to 1.6V (H-Grade, MP-Grade) l –0.2 % gm Transconductance Amplifier gm ITH = 1.2V, Sink/Source = 5µA (Note 4) 2 mmho gm GBW Transconductance Amp Gain Bandwidth ITH = 1.2V (Note 8) 3 MHz IQ Input DC Supply Current (Note 5) Normal Mode VRUN = 5V 1.2 mA Shutdown VRUN = 0V 25 50 µA UVLO Undervoltage Lockout on INTVCC VINTVCC Ramping Down 3.25 V UVLO Hys UVLO Hysteresis 0.4 V VOVL Feedback Overvoltage Lockout VFB with Respect to Set Regulated Voltage VFB Ramping 7.5 10 12.5 % Positive (OV) ISENSE SENSE Pins Current ±1 ±2 µA ITK/SS Soft-Start Charge Current VTK/SS = 0V 0.6 1 2 µA VRUN RUN Pin On—Threshold VRUN Rising l 1.10 1.22 1.35 V VRUNHYS RUN Pin On—Hysteresis 120 mV VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE = 3.3V, ILIM = 0V l 20 30 40 mV VFB = 0.7V, VSENSE = 3.3V, ILIM = 0V (H-/MP-Grade) l 15 45 mV VFB = 0.7V, VSENSE = 3.3V, ILIM = Float l 40 53 65 mV VFB = 0.7V, VSENSE = 3.3V, ILIM = Float (H-/MP-Grade) l 35 70 mV VFB = 0.7V, VSENSE = 3.3V, ILIM = INTVCC l 65 80 95 mV VFB = 0.7V, VSENSE = 3.3V, ILIM = INTVCC (H-/MP-Grade) l 60 100 mV TG RUP TG Driver Pull-Up On-Resistance TG High 2.2 Ω TG RDOWN TG Driver Pull-Down On-Resistance TG Low 1.2 Ω BG RUP BG Driver Pull-Up On-Resistance BG High 2.1 Ω BG RDOWN BG Driver Pull-Down On-Resistance BG Low 1.1 Ω TG Transition Time (Note 6) TG tr Rise Time CLOAD = 3300pF 25 ns TG tf Fall Time CLOAD = 3300pF 25 ns BG Transition Time (Note 6) BG tr Rise Time CLOAD = 3300pF 25 ns BG tf Fall Time CLOAD = 3300pF 25 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver 30 ns Bottom Switch-On Delay Time (Note 6) BG/TG t2D Bottom Gate Off to Top Gate On Delay Top CLOAD = 3300pF Each Driver 30 ns Switch-On Delay Time (Note 6) tON(MIN) Minimum On-Time (Note 7) 90 ns 3851afa 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts