Datasheet LTC7802 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum |
| Pages / Page | 34 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. vs Load … |
| File Format / Size | PDF / 3.1 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. vs Load Current. vs Output Current. Efficiency vs Load Current
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LTC7802
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss vs Load Current vs Output Current Efficiency vs Load Current vs Output Current Efficiency vs Input Voltage
100 100 100 BURST EFFICIENCY 100 V FIGURE 9 CIRCUIT 90 OUT = 5V 95 ILOAD1,2 = 8A PULSE–SKIPPING 98 80 10 EFFICIENCY 90 70 FCM EFFICIENCY POWER LOSS (W) 85 96 VOUT2 = 5V 60 1 80 94 FCM LOSS 50 75 VOUT1 = 3.3V 40 92 BURST 0.1 70 EFFICIENCY (%) PULSE–SKIPPING EFFICIENCY (%) EFFICIENCY (%) 30 LOSS LOSS VIN = 8V 65 V 90 IN = 16V 20 V 0.01 60 V IN = 12V IN = 24V V 88 10 OUT = 5V 55 FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT Burst Mode OPERATION 0 0.001 50 86 0.0001 0.001 0.01 0.1 1 10 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) 7802 G01 7802 G02 7802 G03
Load Step Forced Load Step Burst Mode Operation Load Step Pulse-Skipping Mode Continuous Mode
VOUT VOUT V 200mV/DIV OUT 200mV/DIV 200mV/DIV INDUCTOR INDUCTOR INDUCTOR CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV LOAD LOAD LOAD CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV 50µs/DIV 7802 G04 50µs/DIV 7802 G05 50µs/DIV 7802 G06 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V 300mA TO 6A LOAD STEP 300mA TO 6A LOAD STEP 300mA TO 6A LOAD STEP FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT
Regulated Feedback Voltage Inductor Current at Light Load Soft Start-Up vs Temperature vs T
808 FORCED 806 CONTINUOUS RUN1,2 MODE 5V/DIV 804 VOUT2 TAGE (mV) 1V/DIV 802 Burst Mode TAGE OPERATION VOL 800 2A/DIV VOUT1 1V/DIV PULSE 798 SKIPPING MODE TED FEEDBACK VOL 796 4µs/DIV 7802 G07 1ms/DIV 7802 G08 794 V REGULA IN = 10V V V IN = 10V OUT = 5V NO LOAD FIGURE 9 CIRCUIT 792–55 –25 5 35 65 95 125 155 FIGURE 9 CIRCUIT TEMPERATURE (°C) 7802 G09 Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss vs Load Current vs Output Current Efficiency vs Load Current vs Output Current Efficiency vs Input Voltage
100 100 100 BURST EFFICIENCY 100 V FIGURE 9 CIRCUIT 90 OUT = 5V 95 ILOAD1,2 = 8A PULSE–SKIPPING 98 80 10 EFFICIENCY 90 70 FCM EFFICIENCY POWER LOSS (W) 85 96 VOUT2 = 5V 60 1 80 94 FCM LOSS 50 75 VOUT1 = 3.3V 40 92 BURST 0.1 70 EFFICIENCY (%) PULSE–SKIPPING EFFICIENCY (%) EFFICIENCY (%) 30 LOSS LOSS VIN = 8V 65 V 90 IN = 16V 20 V 0.01 60 V IN = 12V IN = 24V V 88 10 OUT = 5V 55 FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT Burst Mode OPERATION 0 0.001 50 86 0.0001 0.001 0.01 0.1 1 10 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) 7802 G01 7802 G02 7802 G03
Load Step Forced Load Step Burst Mode Operation Load Step Pulse-Skipping Mode Continuous Mode
VOUT VOUT V 200mV/DIV OUT 200mV/DIV 200mV/DIV INDUCTOR INDUCTOR INDUCTOR CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV LOAD LOAD LOAD CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV 50µs/DIV 7802 G04 50µs/DIV 7802 G05 50µs/DIV 7802 G06 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V 300mA TO 6A LOAD STEP 300mA TO 6A LOAD STEP 300mA TO 6A LOAD STEP FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT
Regulated Feedback Voltage Inductor Current at Light Load Soft Start-Up vs Temperature vs T
808 FORCED 806 CONTINUOUS RUN1,2 MODE 5V/DIV 804 VOUT2 TAGE (mV) 1V/DIV 802 Burst Mode TAGE OPERATION VOL 800 2A/DIV VOUT1 1V/DIV PULSE 798 SKIPPING MODE TED FEEDBACK VOL 796 4µs/DIV 7802 G07 1ms/DIV 7802 G08 794 V REGULA IN = 10V V V IN = 10V OUT = 5V NO LOAD FIGURE 9 CIRCUIT 792–55 –25 5 35 65 95 125 155 FIGURE 9 CIRCUIT TEMPERATURE (°C) 7802 G09 Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
