Datasheet LTC7800 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | Low IQ , 60V, High Frequency Synchronous Step-Down Controller |
| 页数 / 页 | 32 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Shutdown Current vs Input. Inductor … |
| 文件格式/大小 | PDF / 1.3 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Shutdown Current vs Input. Inductor Current at Light Load. Soft Start-Up. Voltage
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LTC7800
TYPICAL PERFORMANCE CHARACTERISTICS Shutdown Current vs Input Inductor Current at Light Load Soft Start-Up Voltage
30 FORCED VOUT = 5V CONTINUOUS 1V/DIV 25 MODE Burst Mode VOUT = 3.3V 20 OPERATION 1V/DIV 2A/DIV 15 PULSE-SKIPPING 10 MODE SHUTDOWN CURRENT (µA) 1µs/DIV 7800 G07 2ms/DIV 7800 G08 5 VIN = 12V FIGURES 11, 12 CIRCUITS VOUT = 3.3V I 0 LOAD = 50mA 5 10 15 20 25 30 35 40 45 50 55 60 65 INPUT VOLTAGE (V) 7800 G09
Total Input Supply Current vs EXTVCC Switchover and INTVCC Input Voltage Voltages vs Temperature INTVCC Line Regulation
300 6.0 5.5 FIGURE 13 CIRCUIT 5.8 250 5.6 5.0 200 5.4 300µA LOAD VOLTAGE (V) 5.2 INTVCC 4.5 CC TAGE (V) 150 5.0 EXTV VOL Y CURRENT (µA) CC RISING 4.8 V CC 4.0 100 AND INTV 4.6 EXTV INT SUPPL CC FALLING NO LOAD CC 4.4 3.5 50 EXTV 4.2 ILOAD = 10mA 0 4.0 3.0 5 10 15 20 25 30 35 40 45 50 55 60 –75 –50 –25 0 25 50 75 100 125 150 0 5 10 15 20 25 30 35 40 45 50 55 60 65 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 7800 G10 7800 G11 7800 G12
Maximum Current Sense Voltage Maximum Current Sense vs ITH Voltage SENSE– Pin Input Bias Current Threshold vs Duty Cycle
80 800 80 5% DUTY CYCLE 700 60 70 ILIM = FLOAT PULSE-SKIPPING MODE 600 TAGE (mV) 40 Burst Mode 500 60 OPERATION 400 I 20 50 LIM = INTVCC 300 I – CURRENT (µA) LIM = GND 0 200 40 ILIM = INTVCC SENSE 100 I I LIM = GND CURRENT SENSE THESHOLD (mV) –20 LIM = FLOAT 30 FORCED CONTINUOUS MODE 0 MAXIMUM CURRENT SENSE VOL –40 –100 20 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 0 10 20 30 40 50 60 70 80 90 100 VITH (V) VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 7800 G13 7800 G14 7800 G15 7800f 6 For more information www.linear.com/LTC7800 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions FUNCTIONAL Diagram Operation Applications Information Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Shutdown Current vs Input Inductor Current at Light Load Soft Start-Up Voltage
30 FORCED VOUT = 5V CONTINUOUS 1V/DIV 25 MODE Burst Mode VOUT = 3.3V 20 OPERATION 1V/DIV 2A/DIV 15 PULSE-SKIPPING 10 MODE SHUTDOWN CURRENT (µA) 1µs/DIV 7800 G07 2ms/DIV 7800 G08 5 VIN = 12V FIGURES 11, 12 CIRCUITS VOUT = 3.3V I 0 LOAD = 50mA 5 10 15 20 25 30 35 40 45 50 55 60 65 INPUT VOLTAGE (V) 7800 G09
Total Input Supply Current vs EXTVCC Switchover and INTVCC Input Voltage Voltages vs Temperature INTVCC Line Regulation
300 6.0 5.5 FIGURE 13 CIRCUIT 5.8 250 5.6 5.0 200 5.4 300µA LOAD VOLTAGE (V) 5.2 INTVCC 4.5 CC TAGE (V) 150 5.0 EXTV VOL Y CURRENT (µA) CC RISING 4.8 V CC 4.0 100 AND INTV 4.6 EXTV INT SUPPL CC FALLING NO LOAD CC 4.4 3.5 50 EXTV 4.2 ILOAD = 10mA 0 4.0 3.0 5 10 15 20 25 30 35 40 45 50 55 60 –75 –50 –25 0 25 50 75 100 125 150 0 5 10 15 20 25 30 35 40 45 50 55 60 65 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 7800 G10 7800 G11 7800 G12
Maximum Current Sense Voltage Maximum Current Sense vs ITH Voltage SENSE– Pin Input Bias Current Threshold vs Duty Cycle
80 800 80 5% DUTY CYCLE 700 60 70 ILIM = FLOAT PULSE-SKIPPING MODE 600 TAGE (mV) 40 Burst Mode 500 60 OPERATION 400 I 20 50 LIM = INTVCC 300 I – CURRENT (µA) LIM = GND 0 200 40 ILIM = INTVCC SENSE 100 I I LIM = GND CURRENT SENSE THESHOLD (mV) –20 LIM = FLOAT 30 FORCED CONTINUOUS MODE 0 MAXIMUM CURRENT SENSE VOL –40 –100 20 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 20 25 0 10 20 30 40 50 60 70 80 90 100 VITH (V) VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 7800 G13 7800 G14 7800 G15 7800f 6 For more information www.linear.com/LTC7800 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions FUNCTIONAL Diagram Operation Applications Information Typical Application Related Parts