Datasheet LTC3859AL (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ |
| Pages / Page | 44 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. … |
| Revision | B |
| File Format / Size | PDF / 1.2 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. Efficiency. Efficiency vs Input Voltage
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LTC3859AL
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency Efficiency vs Input Voltage vs Output Current (Boost) vs Output Current (Boost) (Boost)
100 10000 100 100 VIN = 8V FIGURE 12 CIRCUIT 90 90 V 99 IN = 5V VBIAS = VIN V 80 1000 80 98 OUT = 10V I POWER LOSS (mW) LOAD = 2A 70 70 97 60 100 60 96 50 50 95 FCM EFFICIENCY 40 PULSE-SKIPPING 10 40 94 EFFICIENCY (%) EFFICIENCY EFFICIENCY (%) EFFICIENCY (%) 30 BURST LOSS 30 93 BURST 20 EFFICIENCY 1 20 92 FCM LOSS FIGURE 12 CIRCUIT 10 PULSE-SKIPPING 10 VBIAS = VIN 91 LOSS V 0 0.1 0 OUT = 10V 90 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 2 3 4 5 6 7 8 9 10 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3859al G10 FIGURE 12 CIRCUIT 3859al G11 3859al G12 VIN = 5V, VOUT = 10V, VBIAS = VIN
Load Step (Boost) Load Step (Boost) Load Step (Boost) Burst Mode Operation Pulse-Skipping Mode Forced Continuous Mode
VOUT V V 100mV/ OUT OUT 100mV/DIV 100mV/DIV DIV AC-COUPLED AC-COUPLED AC- COUPLED IL IL IL 5A/DIV 5A/DIV 5A/DIV 200µs/DIV 3859al G13 200µs/DIV 3859al G14 200µs/DIV 3859al G15 VOUT = 10V VOUT = 10V VOUT = 10V VIN = 5V VIN = 5V VIN = 5V FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT
Inductor Current at Light Load Boost Regulated Feedback (Boost) Soft Start-Up (Boost) Voltage vs Temperature
1.212 FORCED 1.209 CONTINUOUS MODE TAGE (V) 1.206 Burst Mode V 1.203 OUT3 OPERATION 2V/DIV 5A/DIV 1.200 RUN3 PULSE- 5V/DIV 1.197 SKIPPING GND TED FEEDBACK VOL MODE 1.194 2µs/DIV 3859al G16 5ms/DIV 3859al G17 REGULA 1.191 VOUT = 10V VIN = 5V VIN = 7V FIGURE 12 CIRCUIT I 1.188 LOAD = 1mA –75 –50 –25 0 25 50 75 100 120 150 FIGURE 12 CIRCUIT TEMPERATURE (°C) 3859al G18 Rev. B 8 For more information www.analog.com 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 Efficiency vs Input Voltage vs Output Current (Boost) vs Output Current (Boost) (Boost)
100 10000 100 100 VIN = 8V FIGURE 12 CIRCUIT 90 90 V 99 IN = 5V VBIAS = VIN V 80 1000 80 98 OUT = 10V I POWER LOSS (mW) LOAD = 2A 70 70 97 60 100 60 96 50 50 95 FCM EFFICIENCY 40 PULSE-SKIPPING 10 40 94 EFFICIENCY (%) EFFICIENCY EFFICIENCY (%) EFFICIENCY (%) 30 BURST LOSS 30 93 BURST 20 EFFICIENCY 1 20 92 FCM LOSS FIGURE 12 CIRCUIT 10 PULSE-SKIPPING 10 VBIAS = VIN 91 LOSS V 0 0.1 0 OUT = 10V 90 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 2 3 4 5 6 7 8 9 10 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3859al G10 FIGURE 12 CIRCUIT 3859al G11 3859al G12 VIN = 5V, VOUT = 10V, VBIAS = VIN
Load Step (Boost) Load Step (Boost) Load Step (Boost) Burst Mode Operation Pulse-Skipping Mode Forced Continuous Mode
VOUT V V 100mV/ OUT OUT 100mV/DIV 100mV/DIV DIV AC-COUPLED AC-COUPLED AC- COUPLED IL IL IL 5A/DIV 5A/DIV 5A/DIV 200µs/DIV 3859al G13 200µs/DIV 3859al G14 200µs/DIV 3859al G15 VOUT = 10V VOUT = 10V VOUT = 10V VIN = 5V VIN = 5V VIN = 5V FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT
Inductor Current at Light Load Boost Regulated Feedback (Boost) Soft Start-Up (Boost) Voltage vs Temperature
1.212 FORCED 1.209 CONTINUOUS MODE TAGE (V) 1.206 Burst Mode V 1.203 OUT3 OPERATION 2V/DIV 5A/DIV 1.200 RUN3 PULSE- 5V/DIV 1.197 SKIPPING GND TED FEEDBACK VOL MODE 1.194 2µs/DIV 3859al G16 5ms/DIV 3859al G17 REGULA 1.191 VOUT = 10V VIN = 5V VIN = 7V FIGURE 12 CIRCUIT I 1.188 LOAD = 1mA –75 –50 –25 0 25 50 75 100 120 150 FIGURE 12 CIRCUIT TEMPERATURE (°C) 3859al G18 Rev. B 8 For more information www.analog.com 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
