Datasheet LTC3852 (Analog Devices) - 3
| Hersteller | Analog Devices |
| Beschreibung | Low Input Voltage, Synchronous Step-Down DC/DC Controller |
| Seiten / Seite | 32 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| Dateiformat / Größe | PDF / 429 Kb |
| Dokumentensprache | Englisch |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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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
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