Datasheet LTC3863 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | 60V Low IQ Inverting DC/DC Controller |
| 页数 / 页 | 38 / 3 — ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply … |
| 修订版 | B |
| 文件格式/大小 | PDF / 1.5 Mb |
| 文件语言 | 英语 |
ELECTRICAL. CHARACTERISTICS The. denotes the specifications which apply over the specified operating
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LTC3863
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 4) VIN = 12V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply
VIN Input Voltage Operating Range 3.5 60 V VUVLO Undervoltage Lockout (VIN-VCAP) Ramping Up Threshold l 3.25 3.50 3.8 V (VIN-VCAP) Ramping Down Threshold l 3.00 3.25 3.50 V Hysteresis 0.25 V IQ Input DC Supply Current Pulse-Skipping Mode PLLIN/MODE = 0V, FREQ = 0V, 0.77 1.2 mA VFB = 0.83V (No Load) Burst Mode Operation PLLIN/MODE = Open, FREQ = 0V, 50 70 µA VFB = 0.83V (No Load) Shutdown Supply Current RUN = 0V 7 12 µA
Output Sensing
VREG Regulated Feedback Voltage VREG = (VFB – VFBN) VITH = 1.2V (Note 5) l 0.791 0.800 0.809 V ∆VREG Feedback Voltage Line Regulation VIN = 3.8V to 60V (Note 5) –0.005 0.005 %/V ∆VIN ∆VREG Feedback Voltage Load Regulation VITH = 0.6V to 1.8V (Note 5) –0.1 –0.015 0.1 % ∆VITH gm(EA) Error Amplifier Transconductance VITH = 1.2V, ∆IITH = ±5µA (Note 5) 1.8 mS IFBN Feedback Negative Input Bias Current –50 –10 50 nA
Current Sensing
VILIM Current Limit Threshold (VIN-VSENSE) VFB = 0.77V l 85 95 103 mV ISENSE SENSE Pin Input Current VSENSE = VIN 0.1 2 µA
Start-Up and Shutdown
VRUN RUN Pin Enable Threshold VRUN Rising l 1.22 1.26 1.32 V VRUNHYS RUN Pin Hysteresis 150 mV ISS Soft-Start Pin Charging Current VSS = 0V 10 µA
Switching Frequency and Clock Synchronization
f Programmable Switching Frequency RFREQ = 24.9kΩ 105 kHz RFREQ = 64.9kΩ 375 440 505 kHz RFREQ = 105kΩ 810 kHz fLO Low Switching Frequency FREQ = 0V 320 350 380 kHz fHI High Switching Frequency FREQ = Open 485 535 585 kHz fSYNC Synchronization Frequency l 75 750 kHz VCLK(IH) Clock Input High Level into PLLIN/MODE l 2 V VCLK(LO) Clock Input Low Level into PLLIN/MODE l 0.5 V fFOLD Foldback Frequency as Percentage of VFB = 0V, FREQ = 0V 18 % Programmable Frequency tON(MIN) Minimum On-Time 220 ns Rev. B For more information www.analog.com 3 Document Outline Features Applications Typical Application Description 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
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 4) VIN = 12V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply
VIN Input Voltage Operating Range 3.5 60 V VUVLO Undervoltage Lockout (VIN-VCAP) Ramping Up Threshold l 3.25 3.50 3.8 V (VIN-VCAP) Ramping Down Threshold l 3.00 3.25 3.50 V Hysteresis 0.25 V IQ Input DC Supply Current Pulse-Skipping Mode PLLIN/MODE = 0V, FREQ = 0V, 0.77 1.2 mA VFB = 0.83V (No Load) Burst Mode Operation PLLIN/MODE = Open, FREQ = 0V, 50 70 µA VFB = 0.83V (No Load) Shutdown Supply Current RUN = 0V 7 12 µA
Output Sensing
VREG Regulated Feedback Voltage VREG = (VFB – VFBN) VITH = 1.2V (Note 5) l 0.791 0.800 0.809 V ∆VREG Feedback Voltage Line Regulation VIN = 3.8V to 60V (Note 5) –0.005 0.005 %/V ∆VIN ∆VREG Feedback Voltage Load Regulation VITH = 0.6V to 1.8V (Note 5) –0.1 –0.015 0.1 % ∆VITH gm(EA) Error Amplifier Transconductance VITH = 1.2V, ∆IITH = ±5µA (Note 5) 1.8 mS IFBN Feedback Negative Input Bias Current –50 –10 50 nA
Current Sensing
VILIM Current Limit Threshold (VIN-VSENSE) VFB = 0.77V l 85 95 103 mV ISENSE SENSE Pin Input Current VSENSE = VIN 0.1 2 µA
Start-Up and Shutdown
VRUN RUN Pin Enable Threshold VRUN Rising l 1.22 1.26 1.32 V VRUNHYS RUN Pin Hysteresis 150 mV ISS Soft-Start Pin Charging Current VSS = 0V 10 µA
Switching Frequency and Clock Synchronization
f Programmable Switching Frequency RFREQ = 24.9kΩ 105 kHz RFREQ = 64.9kΩ 375 440 505 kHz RFREQ = 105kΩ 810 kHz fLO Low Switching Frequency FREQ = 0V 320 350 380 kHz fHI High Switching Frequency FREQ = Open 485 535 585 kHz fSYNC Synchronization Frequency l 75 750 kHz VCLK(IH) Clock Input High Level into PLLIN/MODE l 2 V VCLK(LO) Clock Input Low Level into PLLIN/MODE l 0.5 V fFOLD Foldback Frequency as Percentage of VFB = 0V, FREQ = 0V 18 % Programmable Frequency tON(MIN) Minimum On-Time 220 ns Rev. B For more information www.analog.com 3 Document Outline Features Applications Typical Application Description 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