Datasheet LTC3868-1 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | Low IQ, Dual 2-Phase Synchronous Step-Down Controller |
| Pages / Page | 38 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Total Input Supply Current. EXTVCC … |
| File Format / Size | PDF / 475 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Total Input Supply Current. EXTVCC Switchover and INTVCC. vs Input Voltage
Model Line for this Datasheet
Text Version of Document
LTC3868-1
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 5.0 VOLTAGE (V) CC EXTVCC RISING 200 4.8 5.1 VOLTAGE (V) 150 NO LOAD 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 28 –45 –20 5 30 55 80 105 130 0 5 10 15 20 25 28 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 38681 G10 38681 G11 38681 G12
Maximum Current Sense Voltage Maximum Current Sense vs ITH Voltage SENSE– Pins Input Bias Current Threshold vs Duty Cycle
80 0 80 PULSE-SKIPPING –50 FORCED CONTINUOUS 60 Burst Mode OPERATION –100 (FALLING) –150 TAGE (mV) 60 Burst Mode OPERATION 40 –200 (RISING) –250 20 –300 40 CURRENT (μA)– –350 0 –400 SENSE –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 I V TH PIN VOLTAGE SENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 38681 G13 38681 G14 38681 G15
Foldback Current Limit Quiescent Current vs Temperature Shutdown Current vs Temperature
90 240 10 230 PLLIN/MODE = 0 80 V 220 IN = 12V V 9 OUT = 3.3V TAGE (mV) 70 210 ONE CHANNEL ON 60 200 8 190 50 180 7 40 170 160 30 150 6 20 QUIESCENT CURRENT (μA) 140 SHUTDOWN CURRENT (μA) 130 5 10 120 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) 38681 G17 38681 G16 38681 G18 38681fd 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 INTVCC 5.2 300μA LOAD 250 5.0 VOLTAGE (V) CC EXTVCC RISING 200 4.8 5.1 VOLTAGE (V) 150 NO LOAD 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 28 –45 –20 5 30 55 80 105 130 0 5 10 15 20 25 28 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 38681 G10 38681 G11 38681 G12
Maximum Current Sense Voltage Maximum Current Sense vs ITH Voltage SENSE– Pins Input Bias Current Threshold vs Duty Cycle
80 0 80 PULSE-SKIPPING –50 FORCED CONTINUOUS 60 Burst Mode OPERATION –100 (FALLING) –150 TAGE (mV) 60 Burst Mode OPERATION 40 –200 (RISING) –250 20 –300 40 CURRENT (μA)– –350 0 –400 SENSE –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 I V TH PIN VOLTAGE SENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) 38681 G13 38681 G14 38681 G15
Foldback Current Limit Quiescent Current vs Temperature Shutdown Current vs Temperature
90 240 10 230 PLLIN/MODE = 0 80 V 220 IN = 12V V 9 OUT = 3.3V TAGE (mV) 70 210 ONE CHANNEL ON 60 200 8 190 50 180 7 40 170 160 30 150 6 20 QUIESCENT CURRENT (μA) 140 SHUTDOWN CURRENT (μA) 130 5 10 120 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) 38681 G17 38681 G16 38681 G18 38681fd 6
