Datasheet LTC7878 (Analog Devices) - 3
| Fabricante | Analog Devices |
| Descripción | 70V Parallelable 4-Switch Buck-Boost Controller with Inductor DCR Current Sensing |
| Páginas / Página | 30 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Formato / tamaño de archivo | PDF / 2.4 Mb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating
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LTC7878
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. , VIN = 12V, RUN > 1.25V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Bias Supply (VIN, EXTVCC)
VIN Bias Input Supply Operating Voltage Range 5 70 V EXTVcc Auxiliary Bias Voltage Operating Range 5 70 V IQ VIN Supply Current (Shutdown Mode) VIN = 5V, RUN = 0V, EXTVCC = 0V 70 100 µA VIN Supply Current (Standby Mode) VIN = 5V, RUN = 0.9V, EXTVCC = 0V 3 mA
Controller Operation
VOUT Output Voltage Operating Range 1 70 V VFB Regulated Feedback Voltage (Note 4) ITH, ITHB Voltage = 1.2V l 0.99 1.00 1.01 V IVFB VFB Pin Current (Note 4) –50 –100 nA VREFLNREG Reference Voltage Line Regulation (Note 4), VIN = 12V to 72V 0.01 0.2 % VLOADREG Output Voltage Load Regulation Measure in Servo Loop, ITH = ITHB, 0.05 0.2 % ∆ITH Voltage = 1.2V to 1.8V Measure in Servo Loop, ITH = ITHB, –0.05 –0.2 % ∆ITH Voltage = 1.2V to 0.6V gm Error Amplifier Transconductance gm (Note 4) ITH = ITHB = 1.2V, Sink/Source = 10μA 2 mmho gmb (Buck) Error Amplifier Transconductance gmb (Note 4) ITH = ITHB = 1.2V, Sink/Source = 10μA 1 mmho UVLO_DRVCC DRVCC Undervoltage Lockout DRVCC Ramping Down 3.9 4.3 4.5 V UVLO_DRV_HYS DRVCC Undervoltage Hysteresis 0.35 V UVLO_INTVCC INTVCC Undervoltage Lockout INTVCC Ramping Down 3.95 V UVLO_INTV_HYS INTVCC Undervoltage Hysteresis 0.45 V VRUN RUN Pin Threshold 1 (Shutdown to Standby) VRUN Rising 0.3 0.57 V RUN Pin Threshold 2 (Standby to On) VRUN Rising 1.1 1.2 1.3 V IRUN RUN Pin Source Current VRUN <0.57V 1 µA 0.57V < VRUN < 1.2V 2 µA VRUN > 1.2V 6 µA ISS Soft-Start (SS Pin) Source Current 2.5 µA DMAX_BG2 Maximum Duty Cycle of Boost Mode (BG2) 90 %
Inductor Current Sensing
VSENSE(ILMAX) Maximum Inductor Peak Current Sense MODE/ILIM < INTVCC/2, ITH = ITHB = 2.1V, l 18 25 32 mV Threshold VISNSP– VISNSD = 25mV MODE/ILIM > INTVCC/2, ITH = ITHB = 2.1V, l 40 50 60 mV VISNSP – VISNSD = 50mV MODE/ILIM < INTVCC/2, ITH = ITHB = 2.1V, l 92 100 108 mV VISNSP = VISNSD MODE/ILIM > INTVCC/2, ITH = ITHB = 2.1V, l 190 200 210 mV VISNSP = VISNSD IISNSD ISNSD Pin Leakage Current 0 ±0.1 µA IISNSN ISNSN Pin Leakage Current 0 ±0.1 µA
Input/Output Average Current Regulation
ICSP CSP Pin Input Current VCSP = VCSN > 5V, VCSP – VCSN = 50mV 14 20 µA ICSN CSN Pin Input Current VCSP = VCSN > 5V, VCSP – VCSN = 50mV 14 20 µA ∆ICS CSP/CSN Pin Current Mismatch VCSP = 12V, VCSP – VCSN = 50mV 0.05 ±1 µA VMAX(IAVG) Maximum Average Current Limit VCSP = 12V l 46.5 50 53 mV ISETCUR SETCUR Pin Output Current 14 15 16 µA Rev. C For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications 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. , VIN = 12V, RUN > 1.25V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Bias Supply (VIN, EXTVCC)
VIN Bias Input Supply Operating Voltage Range 5 70 V EXTVcc Auxiliary Bias Voltage Operating Range 5 70 V IQ VIN Supply Current (Shutdown Mode) VIN = 5V, RUN = 0V, EXTVCC = 0V 70 100 µA VIN Supply Current (Standby Mode) VIN = 5V, RUN = 0.9V, EXTVCC = 0V 3 mA
Controller Operation
VOUT Output Voltage Operating Range 1 70 V VFB Regulated Feedback Voltage (Note 4) ITH, ITHB Voltage = 1.2V l 0.99 1.00 1.01 V IVFB VFB Pin Current (Note 4) –50 –100 nA VREFLNREG Reference Voltage Line Regulation (Note 4), VIN = 12V to 72V 0.01 0.2 % VLOADREG Output Voltage Load Regulation Measure in Servo Loop, ITH = ITHB, 0.05 0.2 % ∆ITH Voltage = 1.2V to 1.8V Measure in Servo Loop, ITH = ITHB, –0.05 –0.2 % ∆ITH Voltage = 1.2V to 0.6V gm Error Amplifier Transconductance gm (Note 4) ITH = ITHB = 1.2V, Sink/Source = 10μA 2 mmho gmb (Buck) Error Amplifier Transconductance gmb (Note 4) ITH = ITHB = 1.2V, Sink/Source = 10μA 1 mmho UVLO_DRVCC DRVCC Undervoltage Lockout DRVCC Ramping Down 3.9 4.3 4.5 V UVLO_DRV_HYS DRVCC Undervoltage Hysteresis 0.35 V UVLO_INTVCC INTVCC Undervoltage Lockout INTVCC Ramping Down 3.95 V UVLO_INTV_HYS INTVCC Undervoltage Hysteresis 0.45 V VRUN RUN Pin Threshold 1 (Shutdown to Standby) VRUN Rising 0.3 0.57 V RUN Pin Threshold 2 (Standby to On) VRUN Rising 1.1 1.2 1.3 V IRUN RUN Pin Source Current VRUN <0.57V 1 µA 0.57V < VRUN < 1.2V 2 µA VRUN > 1.2V 6 µA ISS Soft-Start (SS Pin) Source Current 2.5 µA DMAX_BG2 Maximum Duty Cycle of Boost Mode (BG2) 90 %
Inductor Current Sensing
VSENSE(ILMAX) Maximum Inductor Peak Current Sense MODE/ILIM < INTVCC/2, ITH = ITHB = 2.1V, l 18 25 32 mV Threshold VISNSP– VISNSD = 25mV MODE/ILIM > INTVCC/2, ITH = ITHB = 2.1V, l 40 50 60 mV VISNSP – VISNSD = 50mV MODE/ILIM < INTVCC/2, ITH = ITHB = 2.1V, l 92 100 108 mV VISNSP = VISNSD MODE/ILIM > INTVCC/2, ITH = ITHB = 2.1V, l 190 200 210 mV VISNSP = VISNSD IISNSD ISNSD Pin Leakage Current 0 ±0.1 µA IISNSN ISNSN Pin Leakage Current 0 ±0.1 µA
Input/Output Average Current Regulation
ICSP CSP Pin Input Current VCSP = VCSN > 5V, VCSP – VCSN = 50mV 14 20 µA ICSN CSN Pin Input Current VCSP = VCSN > 5V, VCSP – VCSN = 50mV 14 20 µA ∆ICS CSP/CSN Pin Current Mismatch VCSP = 12V, VCSP – VCSN = 50mV 0.05 ±1 µA VMAX(IAVG) Maximum Average Current Limit VCSP = 12V l 46.5 50 53 mV ISETCUR SETCUR Pin Output Current 14 15 16 µA Rev. C For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts