Datasheet LTC3859AL (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ |
| Seiten / Seite | 44 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. … |
| Revision | B |
| Dateiformat / Größe | PDF / 1.2 Mb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. Efficiency. vs Output Current (Buck)
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LTC3859AL
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency vs Output Current (Buck) vs Output Current (Buck) Efficiency vs Input Voltage (Buck)
100 10000 100 100 FIGURE 12 CIRCUIT 90 90 VIN = 10V 99 VOUT = 5V I 80 1000 80 V LOAD = 4A IN = 20V POWER LOSS (mW) 98 70 70 60 100 60 97 50 50 96 40 FCM EFFICIENCY 10 40 EFFICIENCY (%) PULSE-SKIPPING EFFICIENCY (%) EFFICIENCY (%) 95 30 EFFICIENCY 30 BURST LOSS 94 20 BURST EFFICIENCY 1 20 FCM LOSS 10 93 PULSE-SKIPPING 10 FIGURE 12 CIRCUIT LOSS VOUT = 5V 0 0.1 0 92 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) 3859al G01 FIGURE 12 CIRCUIT 3859al G02 3859al G03 VIN = 10V, VOUT = 5V
Load Step (Buck) Load Step (Buck) Load Step (Buck) Burst Mode Operation Pulse-Skipping Mode Forced Continuous Mode
VOUT 100mV/DIV VOUT VOUT AC-COUPLED 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED IL IL IL 2A//DIV 2A//DIV 2A//DIV 50µs/DIV 3859al G04 50µs/DIV 3859al G05 50µs/DIV 3859al G06 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT
Inductor Current at Light Load Buck Regulated Feedback Voltage (Buck) Soft Start-Up (Buck) vs Temperature
808 FORCED 806 CONTINUOUS MODE VOUT2 804 2V/DIV TAGE (mV) Burst Mode 802 OPERATION VOUT1 1A/DIV 2V/DIV 800 RUN1/ PULSE- RUN2 798 SKIPPING 5V/DIV TED FEEDBACK VOL MODE 796 2µs/DIV 3859al G07 5ms/DIV 3859al G08 794 V REGULA IN = 10V V V IN = 12V OUT = 5V FIGURE 12 CIRCUIT 792 ILOAD = 1mA –75 –50 –25 0 25 50 75 100 125 150 FIGURE 12 CIRCUIT TEMPERATURE (°C) 3859al G09 Rev. B For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency vs Output Current (Buck) vs Output Current (Buck) Efficiency vs Input Voltage (Buck)
100 10000 100 100 FIGURE 12 CIRCUIT 90 90 VIN = 10V 99 VOUT = 5V I 80 1000 80 V LOAD = 4A IN = 20V POWER LOSS (mW) 98 70 70 60 100 60 97 50 50 96 40 FCM EFFICIENCY 10 40 EFFICIENCY (%) PULSE-SKIPPING EFFICIENCY (%) EFFICIENCY (%) 95 30 EFFICIENCY 30 BURST LOSS 94 20 BURST EFFICIENCY 1 20 FCM LOSS 10 93 PULSE-SKIPPING 10 FIGURE 12 CIRCUIT LOSS VOUT = 5V 0 0.1 0 92 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) 3859al G01 FIGURE 12 CIRCUIT 3859al G02 3859al G03 VIN = 10V, VOUT = 5V
Load Step (Buck) Load Step (Buck) Load Step (Buck) Burst Mode Operation Pulse-Skipping Mode Forced Continuous Mode
VOUT 100mV/DIV VOUT VOUT AC-COUPLED 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED IL IL IL 2A//DIV 2A//DIV 2A//DIV 50µs/DIV 3859al G04 50µs/DIV 3859al G05 50µs/DIV 3859al G06 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT
Inductor Current at Light Load Buck Regulated Feedback Voltage (Buck) Soft Start-Up (Buck) vs Temperature
808 FORCED 806 CONTINUOUS MODE VOUT2 804 2V/DIV TAGE (mV) Burst Mode 802 OPERATION VOUT1 1A/DIV 2V/DIV 800 RUN1/ PULSE- RUN2 798 SKIPPING 5V/DIV TED FEEDBACK VOL MODE 796 2µs/DIV 3859al G07 5ms/DIV 3859al G08 794 V REGULA IN = 10V V V IN = 12V OUT = 5V FIGURE 12 CIRCUIT 792 ILOAD = 1mA –75 –50 –25 0 25 50 75 100 125 150 FIGURE 12 CIRCUIT TEMPERATURE (°C) 3859al G09 Rev. B For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts