Datasheet LTC3867 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control |
| 页数 / 页 | 36 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 394 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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LTC3867
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop/Whole System
VIN Input Voltage Range 4 38 V VOUT Output Voltage Range 0.6 14 V VFB Regulated Feedback Voltage ITH =1.2V, 0°C to 85°C 595.5 600 604.5 mV ITH =1.2V, –40°C to 125°C (Note 3) l 594 600 606 mV IFB Feedback Current –15 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.5V to 38V 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation ΔITH =1.2V to 0.7V l 0.01 0.1 % ΔITH =1.2V to 1.6V l –0.01 –0.1 % gm Transconductance Amplifier gm ITH =1.2V, Sink/Source 5µA 2 mmho VOVL Feedback Overvoltage Lockout Measured at VFB l 5 7.5 10 % IQ Input DC Supply Current Normal Mode 3.5 mA Shutdown VRUN = 0V (Note 4) 30 50 µA DFMAX Maximum Duty Factor In Dropout, fSW = 600kHz 96 98 % UVLO Undervoltage Lockout VINTVCC Falling 3.0 3.2 3.4 V UVLOHYS UVLO Hysteresis 600 mV ISENSE Sense Pin Bias Currents VSENSE = 3.3V l ±1 ±2 µA ITEMP DCR Tempco Compensation Current VITEMP = 500mV l 27 30 33 µA IFAST Fast Transient Programming Current VIFAST = 500mV l 9 10 11 µA ITK/SS Soft-Start Charge Current VTK/SS = 0V 1 1.25 1.4 µA VRUN RUN Pin On Threshold VRUN Rising l 1.1 1.22 1.34 V VRUN(HYS) RUN Pin On Hysteresis 80 mV IRUN RUN Pin Pull-Up Current RUN < On Threshold RUN < 1.1V 1 µA RUN > On Threshold RUN > 1.34V 5 µA VSENSE(MAX) Maximum Current Sense Threshold ITH =1.85V, VSENSE =3.3V ILIM = 0V l 25 30 35 mV ILIM = 1.5V l 35 40 45 mV ILIM = Float l 45 50 55 mV ILIM = 3.7V l 55 60 65 mV ILIM = INTVCC l 69 75 79 mV tON(MIN) Minimum On-Time (Note 6) 65 ns
Power Good
VPGOOD(ON) PGOOD Pull-Down Resistance 90 200 Ω IPGOOD(OFF) PGOOD Leakage Current VPGOOD = 5V –2 2 µA tPGOOD PGOOD Delay VPGOOD High to Low 45 µs VPG1 PGOOD Trip Level—with Delay VFB with Respect to Set Output Voltage VFB Ramping Up 5 7.5 10 % VFB Ramping Down –5 –7.5 –10 % 3867f 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description 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 2). VIN = 15V, VRUN = 5V unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop/Whole System
VIN Input Voltage Range 4 38 V VOUT Output Voltage Range 0.6 14 V VFB Regulated Feedback Voltage ITH =1.2V, 0°C to 85°C 595.5 600 604.5 mV ITH =1.2V, –40°C to 125°C (Note 3) l 594 600 606 mV IFB Feedback Current –15 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.5V to 38V 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation ΔITH =1.2V to 0.7V l 0.01 0.1 % ΔITH =1.2V to 1.6V l –0.01 –0.1 % gm Transconductance Amplifier gm ITH =1.2V, Sink/Source 5µA 2 mmho VOVL Feedback Overvoltage Lockout Measured at VFB l 5 7.5 10 % IQ Input DC Supply Current Normal Mode 3.5 mA Shutdown VRUN = 0V (Note 4) 30 50 µA DFMAX Maximum Duty Factor In Dropout, fSW = 600kHz 96 98 % UVLO Undervoltage Lockout VINTVCC Falling 3.0 3.2 3.4 V UVLOHYS UVLO Hysteresis 600 mV ISENSE Sense Pin Bias Currents VSENSE = 3.3V l ±1 ±2 µA ITEMP DCR Tempco Compensation Current VITEMP = 500mV l 27 30 33 µA IFAST Fast Transient Programming Current VIFAST = 500mV l 9 10 11 µA ITK/SS Soft-Start Charge Current VTK/SS = 0V 1 1.25 1.4 µA VRUN RUN Pin On Threshold VRUN Rising l 1.1 1.22 1.34 V VRUN(HYS) RUN Pin On Hysteresis 80 mV IRUN RUN Pin Pull-Up Current RUN < On Threshold RUN < 1.1V 1 µA RUN > On Threshold RUN > 1.34V 5 µA VSENSE(MAX) Maximum Current Sense Threshold ITH =1.85V, VSENSE =3.3V ILIM = 0V l 25 30 35 mV ILIM = 1.5V l 35 40 45 mV ILIM = Float l 45 50 55 mV ILIM = 3.7V l 55 60 65 mV ILIM = INTVCC l 69 75 79 mV tON(MIN) Minimum On-Time (Note 6) 65 ns
Power Good
VPGOOD(ON) PGOOD Pull-Down Resistance 90 200 Ω IPGOOD(OFF) PGOOD Leakage Current VPGOOD = 5V –2 2 µA tPGOOD PGOOD Delay VPGOOD High to Low 45 µs VPG1 PGOOD Trip Level—with Delay VFB with Respect to Set Output Voltage VFB Ramping Up 5 7.5 10 % VFB Ramping Down –5 –7.5 –10 % 3867f 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Typical Application Related Parts