Datasheet LTC3822-1 (Analog Devices) - 4
| Fabricante | Analog Devices |
| Descripción | No RSENSE , Low Input Voltage, Synchronous Step-Down DC/DC Controller |
| Páginas / Página | 24 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi … |
| Formato / tamaño de archivo | PDF / 389 Kb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi ciency/Power Loss vs Load Current
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LTC3822-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi ciency/Power Loss vs Load Current Load Step (Continuous Mode) Load Step (Pulse Skip Mode)
100 100 VIN = 3.3V, VOUT = 1.8V 90 VOUT VOUT 80 10 AC COUPLED AC COUPLED EFFICIENCY 200mV/DIV POWER LOSS (W) 200mV/DIV 70 60 1 50 INDUCTOR INDUCTOR 40 0.1 CURRENT CURRENT EFFICIENCY (%) POWER LOSS 2A/DIV 2A/DIV 30 20 FIGURE 10 CIRCUIT 0.01 Burst Mode OPERATION 50µs/DIV 38221 G02 50µs/DIV 38221 G04 10 PULSE SKIPPING FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT CONTINUOUS MODE 0 0.001 10 100 1000 10000 LOAD CURRENT (mA) 38221 G01
Regulated Feedback Voltage Undervoltage Lockout Threshold Load Step (Burst Mode Operation) vs Temperature vs Temperature
0.604 2.55 V 0.603 2.50 OUT V AC COUPLED IN RISING 200mV/DIV 0.602 2.45 0.601 2.40 0.600 2.35 INDUCTOR CURRENT 0.599 2.30 2A/DIV INPUT VOLTAGE (V) VIN FALLING FEEDBACK VOLTAGE (V) 0.598 2.25 50µs/DIV 38221 G05 0.597 2.20 FIGURE 10 CIRCUIT 0.596 2.15 –50 0 50 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) 38212 G06 38221 G07
Shutdown (RUN) Threshold Maximum Current Sense Oscillator Frequency vs Temperature Threshold vs Temperature vs Temperature
1.20 135 10 IPRG = FLOAT 8 6 1.15 130 4 2 1.10 125 0 –2 RUN VOLTAGE (V) –4 1.05 120 –6 NORMALIZED FREQUENCY SHIFT (%) –8 1.00 MAXIMUM CURRENT SENSE THRESHOLD (mV) 115 –10 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 38221 G08 3822 G09 38221 G10 38221f 4
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Effi ciency/Power Loss vs Load Current Load Step (Continuous Mode) Load Step (Pulse Skip Mode)
100 100 VIN = 3.3V, VOUT = 1.8V 90 VOUT VOUT 80 10 AC COUPLED AC COUPLED EFFICIENCY 200mV/DIV POWER LOSS (W) 200mV/DIV 70 60 1 50 INDUCTOR INDUCTOR 40 0.1 CURRENT CURRENT EFFICIENCY (%) POWER LOSS 2A/DIV 2A/DIV 30 20 FIGURE 10 CIRCUIT 0.01 Burst Mode OPERATION 50µs/DIV 38221 G02 50µs/DIV 38221 G04 10 PULSE SKIPPING FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT CONTINUOUS MODE 0 0.001 10 100 1000 10000 LOAD CURRENT (mA) 38221 G01
Regulated Feedback Voltage Undervoltage Lockout Threshold Load Step (Burst Mode Operation) vs Temperature vs Temperature
0.604 2.55 V 0.603 2.50 OUT V AC COUPLED IN RISING 200mV/DIV 0.602 2.45 0.601 2.40 0.600 2.35 INDUCTOR CURRENT 0.599 2.30 2A/DIV INPUT VOLTAGE (V) VIN FALLING FEEDBACK VOLTAGE (V) 0.598 2.25 50µs/DIV 38221 G05 0.597 2.20 FIGURE 10 CIRCUIT 0.596 2.15 –50 0 50 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) 38212 G06 38221 G07
Shutdown (RUN) Threshold Maximum Current Sense Oscillator Frequency vs Temperature Threshold vs Temperature vs Temperature
1.20 135 10 IPRG = FLOAT 8 6 1.15 130 4 2 1.10 125 0 –2 RUN VOLTAGE (V) –4 1.05 120 –6 NORMALIZED FREQUENCY SHIFT (%) –8 1.00 MAXIMUM CURRENT SENSE THRESHOLD (mV) 115 –10 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 38221 G08 3822 G09 38221 G10 38221f 4