Datasheet LTC3891 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | Low IQ, 60V Synchronous Step-Down Controller |
| Seiten / Seite | 32 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Load Step. Burst Mode Operation. … |
| Dateiformat / Größe | PDF / 691 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. Load Step. Burst Mode Operation. Pulse-Skipping Mode. Forced Continuous Mode
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LTC3891
TYPICAL PERFORMANCE CHARACTERISTICS Load Step Load Step Load Step Burst Mode Operation Pulse-Skipping Mode Forced Continuous Mode
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC- AC- AC- COUPLED COUPLED COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 50µs/DIV 3891 G04 50µs/DIV 3891 G05 50µs/DIV 3891 G06 LOAD STEP = 100mA TO 3A LOAD STEP = 100mA TO 3A LOAD STEP = 100mA TO 3A VIN = 12V VIN = 12V VIN = 12V VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT
Inductor Current at Light Load Soft Start-Up Tracking Start-Up
FORCED CONTINUOUS MODE VOUT = 8.5V MASTER 2V/DIV 2V/DIV Burst Mode OPERATION V V 1A/DIV OUT = 3.3V OUT 2V/DIV 2V/DIV PULSE-SKIPPING MODE 5µs/DIV 3891 G07 2ms/DIV 3891 G08 2ms/DIV 3891 G09 VIN = 12V FIGURES 12, 14 CIRCUITS VOUT = 3.3V ILOAD = 200µA
Total Input Supply Current vs EXTVCC Switchover and INTVCC Input Voltage Voltages vs Temperature INTVCC Line Regulation
300 6.0 5.5 FIGURE 12 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 EXTV INT SUPPL 4.6 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 65 –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) 3891 G10 3891 G12 3891 G11 3891fa 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions FUNCTIONAL Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Load Step Load Step Load Step Burst Mode Operation Pulse-Skipping Mode Forced Continuous Mode
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC- AC- AC- COUPLED COUPLED COUPLED IL IL IL 2A/DIV 2A/DIV 2A/DIV 50µs/DIV 3891 G04 50µs/DIV 3891 G05 50µs/DIV 3891 G06 LOAD STEP = 100mA TO 3A LOAD STEP = 100mA TO 3A LOAD STEP = 100mA TO 3A VIN = 12V VIN = 12V VIN = 12V VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT
Inductor Current at Light Load Soft Start-Up Tracking Start-Up
FORCED CONTINUOUS MODE VOUT = 8.5V MASTER 2V/DIV 2V/DIV Burst Mode OPERATION V V 1A/DIV OUT = 3.3V OUT 2V/DIV 2V/DIV PULSE-SKIPPING MODE 5µs/DIV 3891 G07 2ms/DIV 3891 G08 2ms/DIV 3891 G09 VIN = 12V FIGURES 12, 14 CIRCUITS VOUT = 3.3V ILOAD = 200µA
Total Input Supply Current vs EXTVCC Switchover and INTVCC Input Voltage Voltages vs Temperature INTVCC Line Regulation
300 6.0 5.5 FIGURE 12 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 EXTV INT SUPPL 4.6 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 65 –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) 3891 G10 3891 G12 3891 G11 3891fa 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions FUNCTIONAL Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts