Datasheet LTC3852 (Analog Devices) - 3

制造商Analog Devices
描述Low Input Voltage, Synchronous Step-Down DC/DC Controller
页数 / 页32 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply …
文件格式/大小PDF / 429 Kb
文件语言英语

ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating

ELECTRICAL CHARACTERISTICS The denotes the specifi cations which apply over the full operating

该数据表的模型线

文件文字版本

LTC3852
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C (Note 2), VIN1 = 3.3V, VIN2 = 15V, VRUN = 3.3V, SHDN = 0V, MODE/PLLIN = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop (Step-Down Regulator)
VIN2 Controller Input Voltage Range l 4 38 V VFB Regulated Feedback Voltage (Note 3); ITH Voltage = 1.2V l 0.790 0.800 0.810 V IFB Feedback Current (Note 3) –10 –50 nA VREFLNREG Reference Voltage Line Regulation (Notes 3, 9); VIN2 = 6V to 38V 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 3) Measured in Servo Loop; l 0.01 0.1 % DITH Voltage = 1.2V to 0.7V Measured in Servo Loop; l –0.01 –0.1 % DITH Voltage = 1.2V to 1.6V gm Transconductance Amplifi er gm (Note 3); ITH = 1.2V; 2 mmho Sink/Source 5μA IQ(VIN2) Controller Input DC Supply Current (Note 4) VFB = 0.9V 1.4 mA (RUN = 3.3V) Shutdown Supply Current RUN = 0V 25 50 μA IQ(VIN1) Total Input DC Supply Current (Notes 4, 7) VFB = 0.9V 7 mA (RUN = SHDN = 3.3V) Shutdown Supply Current (Note 7) RUN = SHDN = 0V 5 μA UVLO Undervoltage Lockout INTVCC Ramping Down 3.25 V Undervoltage Hysteresis 0.4 V VOVL Feedback Overvoltage Lockout Measured at VFB l 0.86 0.88 0.90 V ISENSE SENSE Pins Current –2.0 2.0 μA ITRACK/SS Soft-Start Charge Current VTRACK/SS = 0V 0.5 1 2 μA VRUN RUN Pin On Threshold VRUN Rising l 1.1 1.22 1.35 V VRUN(HYS) RUN Pin On Hysteresis 130 mV V – SENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE = 3.3V l 40 53 68 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 tr Top Gate Rise Time CLOAD = 3300pF (Note 5) 25 ns TG tf Top Gate Fall Time 25 ns BG tr Bottom Gate Rise Time CLOAD = 3300pF (Note 5) 25 ns BG tf Bottom Gate Fall Time 25 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF (Note 5) 30 ns Synchronous Switch-On Delay Time BG/TG t1D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF (Note 5) 30 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time (Note 6) 90 ns 3852f 3