Datasheet LTC3868 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | Low IQ, Dual 2-Phase Synchronous Step-Down Controller |
| 页数 / 页 | 38 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Total Input Supply Current. EXTVCC … |
| 文件格式/大小 | PDF / 406 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Total Input Supply Current. EXTVCC Switchover and INTVCC. vs Input Voltage
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LTC3868
TYPICAL PERFORMANCE CHARACTERISTICS Total Input Supply Current EXTVCC Switchover and INTVCC vs Input Voltage Voltages vs Temperature INTVCC Line Regulation
400 5.6 5.2 FIGURE 12 CIRCUIT 350 VOUT = 3.3V 5.4 ONE CHANNEL ON 300 5.2 INTVCC 5.2 300µA LOAD 250 VOLTAGE (V) 5.0 CC EXTVCC RISING 200 4.8 5.1 VOLTAGE (V) 150 NO LOAD 4.6 EXTV CC CC FALLING AND INTV SUPPLY CURRENT (µA) INTV 100 CC 4.4 5.1 50 EXTV 4.2 0 4.0 5.0 5 10 15 20 25 28 –45 –20 5 30 55 80 105 130 0 5 10 15 20 25 28 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 3868 G10 3868 G11 3868 G12
Maximum Current Sense Voltage Maximum Current Sense vs ITH Voltage SENSE– Pin Input Bias Current Threshold vs Duty Cycle
80 0 80 PULSE-SKIPPING FORCED CONTINUOUS –50 ILIM = INTVCC 60 Burst Mode OPERATION –100 (FALLING) –150 TAGE (mV) 60 Burst Mode OPERATION 40 ILIM = FLOAT (RISING) –200 –250 20 –300 40 I – CURRENT (µA) –350 LIM = GND I 0 LIM = GND I –400 LIM = FLOAT SENSE ILIM = INTVCC –450 20 –20 –500 CURRENT SENSE THRESHOLD (mV) –550 5% DUTY CYCLE MAXIMUM CURRENT SENSE VOL –40 –600 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 0 10 20 30 40 50 60 70 80 90 100 ITH PIN VOLTAGE VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 3868 G13 3868 G14 3868 G15
Foldback Current Limit Quiescent Current vs Temperature Shutdown Current vs Temperature
90 240 10 230 PLLIN/MODE = 0 80 ILIM = INTVCC V 220 IN = 12V VOUT = 3.3V 9 TAGE (mV) 70 210 ONE CHANNEL ON 60 200 8 ILIM = FLOAT 190 50 180 7 40 170 ILIM = GND 160 30 150 6 20 QUIESCENT CURRENT (µA) 140 SHUTDOWN CURRENT (µA) 130 5 10 MAXIMUM CURRENT SENSE VOL 120 0 110 4 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 –45 –20 5 30 55 80 105 130 –45 –20 5 30 55 80 105 130 FEEDBACK VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3868 G17 3868 G16 3868 G18 3868fe 6 For more information www.linear.com/LTC3868 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Typical Performance Characteristics Pin Functions Operation Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Total Input Supply Current EXTVCC Switchover and INTVCC vs Input Voltage Voltages vs Temperature INTVCC Line Regulation
400 5.6 5.2 FIGURE 12 CIRCUIT 350 VOUT = 3.3V 5.4 ONE CHANNEL ON 300 5.2 INTVCC 5.2 300µA LOAD 250 VOLTAGE (V) 5.0 CC EXTVCC RISING 200 4.8 5.1 VOLTAGE (V) 150 NO LOAD 4.6 EXTV CC CC FALLING AND INTV SUPPLY CURRENT (µA) INTV 100 CC 4.4 5.1 50 EXTV 4.2 0 4.0 5.0 5 10 15 20 25 28 –45 –20 5 30 55 80 105 130 0 5 10 15 20 25 28 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 3868 G10 3868 G11 3868 G12
Maximum Current Sense Voltage Maximum Current Sense vs ITH Voltage SENSE– Pin Input Bias Current Threshold vs Duty Cycle
80 0 80 PULSE-SKIPPING FORCED CONTINUOUS –50 ILIM = INTVCC 60 Burst Mode OPERATION –100 (FALLING) –150 TAGE (mV) 60 Burst Mode OPERATION 40 ILIM = FLOAT (RISING) –200 –250 20 –300 40 I – CURRENT (µA) –350 LIM = GND I 0 LIM = GND I –400 LIM = FLOAT SENSE ILIM = INTVCC –450 20 –20 –500 CURRENT SENSE THRESHOLD (mV) –550 5% DUTY CYCLE MAXIMUM CURRENT SENSE VOL –40 –600 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 5 10 15 0 10 20 30 40 50 60 70 80 90 100 ITH PIN VOLTAGE VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 3868 G13 3868 G14 3868 G15
Foldback Current Limit Quiescent Current vs Temperature Shutdown Current vs Temperature
90 240 10 230 PLLIN/MODE = 0 80 ILIM = INTVCC V 220 IN = 12V VOUT = 3.3V 9 TAGE (mV) 70 210 ONE CHANNEL ON 60 200 8 ILIM = FLOAT 190 50 180 7 40 170 ILIM = GND 160 30 150 6 20 QUIESCENT CURRENT (µA) 140 SHUTDOWN CURRENT (µA) 130 5 10 MAXIMUM CURRENT SENSE VOL 120 0 110 4 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 –45 –20 5 30 55 80 105 130 –45 –20 5 30 55 80 105 130 FEEDBACK VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3868 G17 3868 G16 3868 G18 3868fe 6 For more information www.linear.com/LTC3868 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Typical Performance Characteristics Pin Functions Operation Package Description Typical Application Related Parts