Datasheet LTC3858 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | Low IQ, Dual 2-Phase Synchronous Step-Down Controller |
| Seiten / Seite | 38 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Total Input Supply Current. EXTVCC … |
| Dateiformat / Größe | PDF / 434 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. Total Input Supply Current. EXTVCC Switchover and INTVCC. vs Input Voltage
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LTC3858
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 INTV 5.2 CC 250 300μA LOAD 5.0 VOLTAGE (V) CC EXTVCC RISING 200 4.8 5.1 VOLTAGE (V) NO LOAD 150 CC 4.6 EXTVCC FALLING AND INTV INTV SUPPLY CURRENT (μA) 100 CC 4.4 5.1 50 EXTV 4.2 0 4.0 5.0 5 10 15 20 25 30 35 40 –45 –20 5 30 55 80 105 130 0 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 3858 G10 3858 G11 3858 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 –50 FORCED CONTINUOUS ILIM = INTVCC 60 Burst Mode OPERATION –100 (FALLING) –150 TAGE (mV) 60 Burst Mode OPERATION 40 I –200 LIM = FLOAT (RISING) –250 20 –300 40 CURRENT (μA)– I –350 LIM = GND ILIM = GND 0 –400 ILIM = 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 20 25 0 10 20 30 40 50 60 70 80 90 100 I VSENSE COMMON MODE VOLTAGE (V) TH PIN VOLTAGE DUTY CYCLE (%) 3858 G13 3858 G14 3858 G15
Foldback Current Limit Quiescent Current vs Temperature Shutdown Current vs Temperature
90 230 10 PLLIN/MODE = 0 80 ILIM = INTVCC VIN = 12V 210 VOUT = 3.3V 9 TAGE (mV) 70 ONE CHANNEL ON 60 190 8 ILIM = FLOAT 50 170 7 40 ILIM = GND 30 150 6 20 QUIESCENT CURRENT (μA) SHUTDOWN CURRENT (μA) 130 5 10 MAXIMUM CURRENT SENSE VOL 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) 3858 G17 3858 G16 3858 G18 3858fc 6
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 INTV 5.2 CC 250 300μA LOAD 5.0 VOLTAGE (V) CC EXTVCC RISING 200 4.8 5.1 VOLTAGE (V) NO LOAD 150 CC 4.6 EXTVCC FALLING AND INTV INTV SUPPLY CURRENT (μA) 100 CC 4.4 5.1 50 EXTV 4.2 0 4.0 5.0 5 10 15 20 25 30 35 40 –45 –20 5 30 55 80 105 130 0 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 3858 G10 3858 G11 3858 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 –50 FORCED CONTINUOUS ILIM = INTVCC 60 Burst Mode OPERATION –100 (FALLING) –150 TAGE (mV) 60 Burst Mode OPERATION 40 I –200 LIM = FLOAT (RISING) –250 20 –300 40 CURRENT (μA)– I –350 LIM = GND ILIM = GND 0 –400 ILIM = 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 20 25 0 10 20 30 40 50 60 70 80 90 100 I VSENSE COMMON MODE VOLTAGE (V) TH PIN VOLTAGE DUTY CYCLE (%) 3858 G13 3858 G14 3858 G15
Foldback Current Limit Quiescent Current vs Temperature Shutdown Current vs Temperature
90 230 10 PLLIN/MODE = 0 80 ILIM = INTVCC VIN = 12V 210 VOUT = 3.3V 9 TAGE (mV) 70 ONE CHANNEL ON 60 190 8 ILIM = FLOAT 50 170 7 40 ILIM = GND 30 150 6 20 QUIESCENT CURRENT (μA) SHUTDOWN CURRENT (μA) 130 5 10 MAXIMUM CURRENT SENSE VOL 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) 3858 G17 3858 G16 3858 G18 3858fc 6