Datasheet LTC3869, LTC3869-2 (Analog Devices) - 3

LTC3869/LTC3869-2
e lecTrical characTerisTics The
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denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN1,2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
VIN Input Voltage Range 4 38 V VOUT Output Voltage Range 0.6 12.5 V VFB1,2 Regulated Feedback Voltage ITH1,2 Voltage = 1.2V, 0°C to 85°C l 0.5955 0.600 0.6045 V (Notes 2, 4) ITH1,2 Voltage = 1.2V, –40°C to 125°C l 0.5940 0.600 0.6060 V IFB1,2 Feedback Current (Note 4) –15 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.0V to 38V (Note 4) 0.002 0.01 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V l 0.01 0.1 % Measured in Servo Loop; ∆ITH Voltage = 1.2V to 1.6V l –0.01 –0.1 % gm1,2 Transconductance Amplifier gm ITH1,2 = 1.2V; Sink/Source 5µA; (Note 4) 2 mmho IQ Input DC Supply Current (Note 5) Normal Mode VIN = 15V 3 mA Shutdown VRUN1,2 = 0V 30 50 µA DFMAX Maximum Duty Factor In Dropout 94 95 % UVLO Undervoltage Lockout VINTVCC Ramping Down l 3.0 3.2 3.4 V UVLOHYS UVLO Hysteresis 0.6 V VOVL Feedback Overvoltage Lockout Measured at VFB1,2 l 0.64 0.66 0.68 V ISENSE Sense Pins Bias Current (Each Channel); VSENSE1,2 = 3.3V l ±1 ±2 µA ITK/SS1,2 Soft-Start Charge Current VTK/SS1,2 = 0V l 1.0 1.25 1.5 µA VRUN1,2 RUN Pin On Threshold VRUN1, VRUN2 Rising l 1.1 1.22 1.35 V VRUN1,2(HYS) RUN Pin On Hysteresis 80 mV VSENSE(MAX) Maximum Current Sense Threshold, VFB1,2 = 0.5V, VSENSE1,2 = 3.3V, ILIM = 0V l 25 30 35 mV 0°C to 85°C (Note 2) VFB1,2 = 0.5V, VSENSE1,2 = 3.3V, ILIM = Float l 45 50 55 mV VFB1,2 = 0.5V, VSENSE1,2 = 3.3V, ILIM = INTVCC l 68 75 82 mV Maximum Current Sense Threshold, VFB1,2 = 0.5V, VSENSE1,2 = 3.3V, ILIM = 0V l 23 30 37 mV –40°C to 125°C (Note 2) VFB1,2 = 0.5V, VSENSE1,2 = 3.3V, ILIM = Float l 43 50 57 mV VFB1,2 = 0.5V, VSENSE1,2 = 3.3V, ILIM = INTVCC l 68 75 82 mV VFB1,2 = 0.5V, VSENSE1,2 = 3.3V, LTC3869IGN-2 l 40 50 60 mV VMISMATCH Channel to Channel Current Sense ILIM = Float 2 mV Mismatch Voltage of VSENSE(MAX) TG Transition Time: (Note 8) TG1, 2 tr Rise Time CLOAD = 3300pF 25 ns TG1, 2 tf Fall Time CLOAD = 3300pF 25 ns BG Transition Time: (Note 8) BG1, 2 tr Rise Time CLOAD = 3300pF 25 ns BG1, 2 tf Fall Time CLOAD = 3300pF 25 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver (Note 6) 30 ns Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver (Note 6) 30 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time (Note 7) 90 ns 38692fb For more information www.linear.com/LTC3869 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