Datasheet LTC7871 (Analog Devices) - 5
| Fabricante | Analog Devices |
| Descripción | Six-Phase, Synchronous Bidirectional Buck or Boost Controller |
| Páginas / Página | 48 / 5 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Formato / tamaño de archivo | PDF / 1.4 Mb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LTC7871
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VHIGH = 48V, VRUN = 5V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Sense Pin Voltage VILIM = 0V, 1/4 VV5 40 V/V (V + – SNSD – VSNS ) to IMON Gain VILIM = Float, 3/4 VV5, VV5 20 V/V Total DC Sense Signal Gain DCR Configuration 5 V/V Total DC Sense Signal Gain RSENSE Configuration 4 V/V VSENSE(MAX) Maximum Current Sense Threshold VILIM = 0V l 6.5 10.0 13.5 mV (DCR (Buck and Boost Mode) VILIM = 1/4 VV5 l 17.0 20.0 23.0 mV Configuration) VILIM = Float l 27.0 30.0 33.0 mV VILIM = 3/4 VV5 l 36.0 40.0 44.0 mV VILIM = VV5 l 44.0 50.0 56.0 mV VSENSE(MAX) Maximum Current Sense Threshold VILIM = 0V l 8.1 12.5 16.9 mV (RSENSE (Buck and Boost Mode) VILIM = 1/4 VV5 l 21.2 25.0 28.8 mV Configuration) VILIM = Float l 33.7 37.5 41.3 mV VILIM = 3/4 VV5 l 45.0 50.0 55.0 mV VILIM = VV5 l 55.0 62.5 70.0 mV VOCFT Overcurrent Fault Threshold, VILIM = 0V l 31.0 37.5 44.0 mV V + – SNSD – VSNS VILIM = 1/4 VV5 l 43.0 50.0 57.0 mV VILIM = Float l 54.0 62.5 71.0 mV VILIM = 3/4 VV5 l 65.0 75.0 85.0 mV VILIM = VV5 l 76.0 87.5 99.0 mV VNOCFT Negative Overcurrent Fault Threshold, VILIM = 0V l –45.0 –37.5 –30.0 mV V + – SNSD – VSNS VILIM = 1/4 VV5 l –58.0 –50.0 –42.0 mV VILIM = Float l –72.0 –62.5 –53.0 mV VILIM = 3/4 VV5 l –86.0 –75.0 –64.0 mV VILIM = VV5 l –100.0 –87.5 –75.0 mV Overcurrent Fault Threshold VILIM = 0V 25 mV Hysteresis, |V + – SNSD – VSNS | VILIM = 1/4 VV5, Float, 3/4 VV5, VV5 31 mV
DRVCC and V5 Linear Regulators
VDRVCC DRVCC Regulation Voltage 12V < VEXTVCC < 60V, VDRVSET = VV5 9.5 10 10.5 V 12V < VEXTVCC < 60V, VDRVSET = Float 7.6 8 8.4 V 12V < VEXTVCC < 60V, VDRVSET = 0V 4.8 5 5.2 V DRVCC Load Regulation IDRVCC = 0mA to 100mA, VEXTVCC = 14V 1.6 3.0 % EXTVCC Switchover Voltage EXTVCC Ramping Positive, VDRVSET = VV5 10.7 V EXTVCC Ramping Positive, VDRVSET = Float 8.5 EXTVCC Ramping Positive, VDRVSET = 0V 6.9 V EXTVCC Hysteresis 12 % V5 V5 Regulation Voltage 6V < VDRVCC < 10V 4.8 5.0 5.2 V V5 Load Regulation IV5 = 0mA to 20mA 0.5 1 %
Current DACs (IDAC)
VHIGH/VLOW IDAC Accuracy MFR_IDAC_VLOW/HIGH = 0x40 or 0x7F –1 1 % VHIGH/VLOW IDAC Program Range –64 63 µA SETCUR IDAC Program Range 0 31 µA LSB VHIGH/VLOW IDAC LSB 1 µA SETCUR IDAC LSB 1 µA
Oscillator and Phase-Locked Loop
IFREQ FREQ Pin Output Current l 19 20 21 µA Nominal Frequency VSYNC = 0V, RFREQ = 51.1k 230 250 270 kHz fLOW Low Fixed Frequency VSYNC = 0V, RFREQ = 27.4k 55 70 85 kHz fHIGH High Fixed Frequency VSYNC = 0V, RFREQ = 105k 640 710 780 kHz Rev. 0 For more information www.analog.com 5 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 Serial Port Serial Port Register Details Typical Applications Package Description Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VHIGH = 48V, VRUN = 5V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Sense Pin Voltage VILIM = 0V, 1/4 VV5 40 V/V (V + – SNSD – VSNS ) to IMON Gain VILIM = Float, 3/4 VV5, VV5 20 V/V Total DC Sense Signal Gain DCR Configuration 5 V/V Total DC Sense Signal Gain RSENSE Configuration 4 V/V VSENSE(MAX) Maximum Current Sense Threshold VILIM = 0V l 6.5 10.0 13.5 mV (DCR (Buck and Boost Mode) VILIM = 1/4 VV5 l 17.0 20.0 23.0 mV Configuration) VILIM = Float l 27.0 30.0 33.0 mV VILIM = 3/4 VV5 l 36.0 40.0 44.0 mV VILIM = VV5 l 44.0 50.0 56.0 mV VSENSE(MAX) Maximum Current Sense Threshold VILIM = 0V l 8.1 12.5 16.9 mV (RSENSE (Buck and Boost Mode) VILIM = 1/4 VV5 l 21.2 25.0 28.8 mV Configuration) VILIM = Float l 33.7 37.5 41.3 mV VILIM = 3/4 VV5 l 45.0 50.0 55.0 mV VILIM = VV5 l 55.0 62.5 70.0 mV VOCFT Overcurrent Fault Threshold, VILIM = 0V l 31.0 37.5 44.0 mV V + – SNSD – VSNS VILIM = 1/4 VV5 l 43.0 50.0 57.0 mV VILIM = Float l 54.0 62.5 71.0 mV VILIM = 3/4 VV5 l 65.0 75.0 85.0 mV VILIM = VV5 l 76.0 87.5 99.0 mV VNOCFT Negative Overcurrent Fault Threshold, VILIM = 0V l –45.0 –37.5 –30.0 mV V + – SNSD – VSNS VILIM = 1/4 VV5 l –58.0 –50.0 –42.0 mV VILIM = Float l –72.0 –62.5 –53.0 mV VILIM = 3/4 VV5 l –86.0 –75.0 –64.0 mV VILIM = VV5 l –100.0 –87.5 –75.0 mV Overcurrent Fault Threshold VILIM = 0V 25 mV Hysteresis, |V + – SNSD – VSNS | VILIM = 1/4 VV5, Float, 3/4 VV5, VV5 31 mV
DRVCC and V5 Linear Regulators
VDRVCC DRVCC Regulation Voltage 12V < VEXTVCC < 60V, VDRVSET = VV5 9.5 10 10.5 V 12V < VEXTVCC < 60V, VDRVSET = Float 7.6 8 8.4 V 12V < VEXTVCC < 60V, VDRVSET = 0V 4.8 5 5.2 V DRVCC Load Regulation IDRVCC = 0mA to 100mA, VEXTVCC = 14V 1.6 3.0 % EXTVCC Switchover Voltage EXTVCC Ramping Positive, VDRVSET = VV5 10.7 V EXTVCC Ramping Positive, VDRVSET = Float 8.5 EXTVCC Ramping Positive, VDRVSET = 0V 6.9 V EXTVCC Hysteresis 12 % V5 V5 Regulation Voltage 6V < VDRVCC < 10V 4.8 5.0 5.2 V V5 Load Regulation IV5 = 0mA to 20mA 0.5 1 %
Current DACs (IDAC)
VHIGH/VLOW IDAC Accuracy MFR_IDAC_VLOW/HIGH = 0x40 or 0x7F –1 1 % VHIGH/VLOW IDAC Program Range –64 63 µA SETCUR IDAC Program Range 0 31 µA LSB VHIGH/VLOW IDAC LSB 1 µA SETCUR IDAC LSB 1 µA
Oscillator and Phase-Locked Loop
IFREQ FREQ Pin Output Current l 19 20 21 µA Nominal Frequency VSYNC = 0V, RFREQ = 51.1k 230 250 270 kHz fLOW Low Fixed Frequency VSYNC = 0V, RFREQ = 27.4k 55 70 85 kHz fHIGH High Fixed Frequency VSYNC = 0V, RFREQ = 105k 640 710 780 kHz Rev. 0 For more information www.analog.com 5 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 Serial Port Serial Port Register Details Typical Applications Package Description Typical Application Related Parts