Datasheet LTC3853 (Analog Devices) - 3

LTC3853
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 3), VIN = 15V, VRUN1,2,3 = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
Output Voltage Range Channels 1, 2 0.8 5.5 V Channel 3 0.8 13.5 V VFB1,2,3 Regulated Feedback Voltage ITH1,2,3 Voltage = 1.2V, –55°C to 150°C (Note 4) l 0.790 0.800 0.810 V ITH1,2,3 Voltage = 1.2V, –40°C to 125°C (Note 4) l 0.792 0.800 0.808 V ITH1,2,3 Voltage = 1.2V, 0°C to 85°C (Note 4) 0.794 0.800 0.806 V Feedback Current (Note 4) –10 –50 nA Reference Voltage Line Regulation VIN = 6V to 24V (Note 4) 0.002 0.02 %/V Output Voltage Load Regulation (Note 4) Measured in Servo Loop; DITH Voltage = 1.2V to 0.7V l 0.01 0.1 % Measured in Servo Loop; DITH Voltage = 1.2V to 1.6V l –0.01 –0.1 % Transconductance Amplifier gm ITH1,2,3 = 1.2V, Sink/Source 5µA (Note 4) 2.2 mmho IQ Input DC Supply Current (Note 5) Normal Mode VIN = 15V 4.1 mA Shutdown VRUN1,2,3 = 0V 42 70 µA UVLO Undervoltage Lockout on INTVCC VINTVCC Ramping Down 3.35 V UVLO Hysteresis 0.5 V Feedback Overvoltage Lockout Measured at VFB1,2,3 (H-Grade, MP-Grade) l 0.84 0.86 0.89 V Measured at VFB1,2,3 l 0.84 0.86 0.88 V ISENSE Sense Pin Current VSENSE = 3.3V ±1 ±2 µA Soft-Start Charge Current VTK/SS1,2,3 = 0V 0.9 1.3 1.7 µA VRUN1,2,3 RUN Pin ON Threshold VRUN1, VRUN2, VRUN3 Rising l 1.1 1.2 1.35 V RUN Pin Hysteresis 80 mV Maximum Current Sense Threshold ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = 0V l 22 30 38 mV ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = 0V (H-, MP- l 21 30 39 mV Grade) ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = Float l 42 50 58 mV ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = Float (H-, MP- l 41 50 59 mV Grade) ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = INTVCC l 65 75 85 mV ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = INTVCC (H-, l 64 75 86 mV MP-Grade) Maximum Duty Factor In Dropout 97 98 % TG Driver Pull-Up On-Resistance TG High 2.6 Ω TG Driver Pull-Down On-Resistance TG Low 1.5 Ω BG Driver Pull-Up On-Resistance BG High 2.4 Ω BG Driver Pull-Down On-Resistance BG Low 1.1 Ω TG Transition Time: (Note 6) Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 25 ns BG Transition Time: (Note 6) Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 25 ns Top Gate Off to Bottom Gate On Delay (Note 6) Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 30 ns 3853fc For more information www.linear.com/LTC3853 3 Document Outline Features Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts