Datasheet LTC7801 (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | 150V Low IQ, Synchronous Step-Down DC/DC Controller |
| 页数 / 页 | 38 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. DRVCC and EXTVCC. EXTVCC Switchover … |
| 修订版 | A |
| 文件格式/大小 | PDF / 4.1 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. DRVCC and EXTVCC. EXTVCC Switchover and DRVCC. vs Load Current. Voltages vs Temperature
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LTC7801
TYPICAL PERFORMANCE CHARACTERISTICS DRVCC and EXTVCC EXTVCC Switchover and DRVCC EXTVCC Switchover and DRVCC vs Load Current Voltages vs Temperature Voltages vs Temperature
6.5 6.5 10.5 NDRV LDO (NDRV FET), EXTVCC = 8.5V EXTVCC = 8.5V EXTVCC = 0V 10.0 6.0 6.0 9.5 NDRV LDO (NDRV NFET), NDRV LDO (NDRV FET), 5.5 5.5 EXTV EXTV CC = 0V TAGE (V) CC = 0V V 9.0 V IN LDO (No NDRV FET), TAGE (V) V TAGE (V) IN LDO (No NDRV NFET), EXTV IN LDO (No NDRV FET), EXTV CC = 0V EXTVCC = 8.5V CC = 0V VOL VOL EXTVCC = 0V, VOL 8.5 CC 5.0 CC 5.0 CC DRV EXTVCC RISING DRV DRV EXTV 8.0 CC FALLING EXTVCC RISING 4.5 EXTVCC = 5V 4.5 7.5 EXTVCC FALLING DRVUV = DRVSET = 0V DRVUV = DRVSET = 0V DRVUV = DRVSET = INTV 4.0 4.0 CC 7.0 0 20 40 60 80 100 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 7801 G10 7801 G11 7801 G12
SENSE– Pin Input Current SENSE– Pin Input Bias Current Undervoltage Lockout Threshold vs VSENSE Voltage vs Temperature vs Temperature
1000 1000 8.0 900 900 RISING 7.5 800 800 VOUT ≥ INTVCC + 0.5V DRVUV = INTV 7.0 CC 700 700 6.5 FALLING 600 600 6.0 TAGE (V) 500 500 5.5 – CURRENT (µA) VOL 400 – CURRENT (µA) 400 CC 5.0 300 SENSE 300 DRV SENSE 4.5 RISING DRVUV = 0V 200 200 4.0 100 100 3.5 FALLING VOUT ≤ INTVCC – 0.5V 0 0 3.0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 VSENSE COMMON MODE VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 7801 G13 7801 G14 7801 G15
Maximum Current Sense RUN/OVLO Threshold Foldback Current Limit Threshold vs ITH Voltage vs Temperature
100 100 1.40 5% DUTY CYCLE 90 1.35 80 80 OVLO RISING TAGE (mV) PULSE–SKIPPING 1.30 70 60 RUN RISING BURST MODE TAGE (mV) TAGE (V) 1.25 60 OPERATION 40 50 1.20 40 20 1.15 RUN FALLING 30 0 1.10 RUN/OVLO PIN VOL 20 CURRENT SENSE VOL –20 1.05 10 OVLO FALLING MAXIMUM CURRENT SENSE VOL FORCED CONTINUOUS 0 –40 1.00 0 100 200 300 400 500 600 700 800 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 –75 –50 –25 0 25 50 75 100 125 150 FEEDBACK VOLTAGE (mV) VITH (V) TEMPERATURE (°C) 7801 G16 7801 G17 7801 G18 Rev. A For more information www.analog.com 7 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
TYPICAL PERFORMANCE CHARACTERISTICS DRVCC and EXTVCC EXTVCC Switchover and DRVCC EXTVCC Switchover and DRVCC vs Load Current Voltages vs Temperature Voltages vs Temperature
6.5 6.5 10.5 NDRV LDO (NDRV FET), EXTVCC = 8.5V EXTVCC = 8.5V EXTVCC = 0V 10.0 6.0 6.0 9.5 NDRV LDO (NDRV NFET), NDRV LDO (NDRV FET), 5.5 5.5 EXTV EXTV CC = 0V TAGE (V) CC = 0V V 9.0 V IN LDO (No NDRV FET), TAGE (V) V TAGE (V) IN LDO (No NDRV NFET), EXTV IN LDO (No NDRV FET), EXTV CC = 0V EXTVCC = 8.5V CC = 0V VOL VOL EXTVCC = 0V, VOL 8.5 CC 5.0 CC 5.0 CC DRV EXTVCC RISING DRV DRV EXTV 8.0 CC FALLING EXTVCC RISING 4.5 EXTVCC = 5V 4.5 7.5 EXTVCC FALLING DRVUV = DRVSET = 0V DRVUV = DRVSET = 0V DRVUV = DRVSET = INTV 4.0 4.0 CC 7.0 0 20 40 60 80 100 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 7801 G10 7801 G11 7801 G12
SENSE– Pin Input Current SENSE– Pin Input Bias Current Undervoltage Lockout Threshold vs VSENSE Voltage vs Temperature vs Temperature
1000 1000 8.0 900 900 RISING 7.5 800 800 VOUT ≥ INTVCC + 0.5V DRVUV = INTV 7.0 CC 700 700 6.5 FALLING 600 600 6.0 TAGE (V) 500 500 5.5 – CURRENT (µA) VOL 400 – CURRENT (µA) 400 CC 5.0 300 SENSE 300 DRV SENSE 4.5 RISING DRVUV = 0V 200 200 4.0 100 100 3.5 FALLING VOUT ≤ INTVCC – 0.5V 0 0 3.0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 VSENSE COMMON MODE VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 7801 G13 7801 G14 7801 G15
Maximum Current Sense RUN/OVLO Threshold Foldback Current Limit Threshold vs ITH Voltage vs Temperature
100 100 1.40 5% DUTY CYCLE 90 1.35 80 80 OVLO RISING TAGE (mV) PULSE–SKIPPING 1.30 70 60 RUN RISING BURST MODE TAGE (mV) TAGE (V) 1.25 60 OPERATION 40 50 1.20 40 20 1.15 RUN FALLING 30 0 1.10 RUN/OVLO PIN VOL 20 CURRENT SENSE VOL –20 1.05 10 OVLO FALLING MAXIMUM CURRENT SENSE VOL FORCED CONTINUOUS 0 –40 1.00 0 100 200 300 400 500 600 700 800 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 –75 –50 –25 0 25 50 75 100 125 150 FEEDBACK VOLTAGE (mV) VITH (V) TEMPERATURE (°C) 7801 G16 7801 G17 7801 G18 Rev. A For more information www.analog.com 7 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