Datasheet LTC3826 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 30µA IQ, Dual, 2-Phase Synchronous Step-Down Controller |
| Pages / Page | 36 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Effi ciency and Power Loss vs Output … |
| File Format / Size | PDF / 485 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Effi ciency and Power Loss vs Output Current. Effi ciency vs Output Current
Model Line for this Datasheet
Text Version of Document
LTC3826
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency and Power Loss vs Output Current Effi ciency vs Output Current Effi ciency vs Input Voltage
100 10000 100 98 Burst Mode OPERATION VOUT = 3.3V 90 PULSE SKIPPING MODE 90 96 FORCED 80 1000 80 CONTINUOUS 94 70 POWER LOSS (mW) 70 60 100 60 92 50 50 90 40 10 40 EFFICIENCY (%) EFFICIENCY (%) 88 EFFICIENCY (%) 30 30 86 20 1 20 10 V V 84 IN = 12V 10 IN = 12V V V OUT = 3.3V IN = 5V 0 0.1 0 82 0.00001 0.0001 0.001 0.01 0.1 1 10 0.00001 0.0001 0.001 0.01 0.1 1 10 0 5 10 15 20 25 30 35 40 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3826 G01 3826 G02 3826 G03 FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT
Load Step Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode) (Pulse Skipping Mode)
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC AC AC COUPLED COUPLED COUPLED IL I IL 2A/DIV L 2A/DIV 2A/DIV 20μs/DIV 20μs/DIV 20μs/DIV 3826 G04 3826 G05 3826 G06 FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V
Inductor Current at Light Load Soft-Start-Up Tracking Start-Up
FORCED VOUT2 VOUT2 CONTINUOUS 2V/DIV 2V/DIV MODE 2A/DIV Burst Mode VOUT1 VOUT1 OPERATION 2V/DIV 2V/DIV PULSE SKIPPING MODE 2μs/DIV 3826 G07 FIGURE 13 CIRCUIT VOUT = 3.3V ILOAD = 100μA 20ms/DIV 20ms/DIV 3826 G08 3826 G09 FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT 3826fc 5
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency and Power Loss vs Output Current Effi ciency vs Output Current Effi ciency vs Input Voltage
100 10000 100 98 Burst Mode OPERATION VOUT = 3.3V 90 PULSE SKIPPING MODE 90 96 FORCED 80 1000 80 CONTINUOUS 94 70 POWER LOSS (mW) 70 60 100 60 92 50 50 90 40 10 40 EFFICIENCY (%) EFFICIENCY (%) 88 EFFICIENCY (%) 30 30 86 20 1 20 10 V V 84 IN = 12V 10 IN = 12V V V OUT = 3.3V IN = 5V 0 0.1 0 82 0.00001 0.0001 0.001 0.01 0.1 1 10 0.00001 0.0001 0.001 0.01 0.1 1 10 0 5 10 15 20 25 30 35 40 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3826 G01 3826 G02 3826 G03 FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT
Load Step Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode) (Pulse Skipping Mode)
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC AC AC COUPLED COUPLED COUPLED IL I IL 2A/DIV L 2A/DIV 2A/DIV 20μs/DIV 20μs/DIV 20μs/DIV 3826 G04 3826 G05 3826 G06 FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V
Inductor Current at Light Load Soft-Start-Up Tracking Start-Up
FORCED VOUT2 VOUT2 CONTINUOUS 2V/DIV 2V/DIV MODE 2A/DIV Burst Mode VOUT1 VOUT1 OPERATION 2V/DIV 2V/DIV PULSE SKIPPING MODE 2μs/DIV 3826 G07 FIGURE 13 CIRCUIT VOUT = 3.3V ILOAD = 100μA 20ms/DIV 20ms/DIV 3826 G08 3826 G09 FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT 3826fc 5
