Datasheet LT8550 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | 4-Phase DC/DC Expander with Internal Gate Drivers for Buck Converters |
| Pages / Page | 34 / 9 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 3.2 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. ILIM Low Threshold Voltage vs. Temperature
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LT8550
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. ILIM Low Threshold Voltage vs Temperature ENOUT Threshold Voltage TGSR-TGSL UVLO Threshold
0.9 2.3 2.40 0.8 2.2 RISING 2.35 RISING 2.1 0.7 TAGE (V) 2.0 TAGE (V) 0.6 2.30 FALLING 1.9 FALLING FALLING ILIM VOL 0.5 1.8 2.25 0.4 ENOUT THRESHOLD VOL 1.7 TGSR–TGSL UVLO THRESHOLD (V) 0.3 1.6 2.20 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8550 G28 8550 G29 8550 G30
Oscillator Frequency vs Temperature BST-SW UVLO Threshold
600 3.7 RT = 49.9K 500 RISING 3.6 400 300 3.5 RT = 100K FALLING TOR FREQUENCY (kHz) 200 RT = 249K 3.4 OSCILLA 100 BST–SW UVLO THRESHOLD (V) 0 3.3 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) 8550 G31 8550 G32
Efficiency and Power Loss vs Load Response from 0A to 80A — Load Current — LT8550 + LT3763 LT3741 + LT8550
100 EFFICIENCY 1k 90 VOUT = 12V 80 fs = 250kHz PRIMARY IL 70 POWER LOSS (W) 10A/DIV 100 24V 60 IN–W/O SHEDDING EXPANDER IL2 24VIN–W/ SHEDDING 10A/DIV 50 56VIN–W/O SHEDDING 56VIN–W/ SHEDDING EXPANDER I 40 L3 EFFICIENCY (%) 10A/DIV 10 30 EXPANDER IL4 20 10A/DIV 8550 G34 10 POWER LOSS 400µs/DIV fS = 350kHz 0 1 V 0.1 1 10 100 IN = 24V VOUT = 6V LOAD CURRENT (A) 8550 G33 Rev. 0 For more information www.analog.com 9
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. ILIM Low Threshold Voltage vs Temperature ENOUT Threshold Voltage TGSR-TGSL UVLO Threshold
0.9 2.3 2.40 0.8 2.2 RISING 2.35 RISING 2.1 0.7 TAGE (V) 2.0 TAGE (V) 0.6 2.30 FALLING 1.9 FALLING FALLING ILIM VOL 0.5 1.8 2.25 0.4 ENOUT THRESHOLD VOL 1.7 TGSR–TGSL UVLO THRESHOLD (V) 0.3 1.6 2.20 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8550 G28 8550 G29 8550 G30
Oscillator Frequency vs Temperature BST-SW UVLO Threshold
600 3.7 RT = 49.9K 500 RISING 3.6 400 300 3.5 RT = 100K FALLING TOR FREQUENCY (kHz) 200 RT = 249K 3.4 OSCILLA 100 BST–SW UVLO THRESHOLD (V) 0 3.3 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) 8550 G31 8550 G32
Efficiency and Power Loss vs Load Response from 0A to 80A — Load Current — LT8550 + LT3763 LT3741 + LT8550
100 EFFICIENCY 1k 90 VOUT = 12V 80 fs = 250kHz PRIMARY IL 70 POWER LOSS (W) 10A/DIV 100 24V 60 IN–W/O SHEDDING EXPANDER IL2 24VIN–W/ SHEDDING 10A/DIV 50 56VIN–W/O SHEDDING 56VIN–W/ SHEDDING EXPANDER I 40 L3 EFFICIENCY (%) 10A/DIV 10 30 EXPANDER IL4 20 10A/DIV 8550 G34 10 POWER LOSS 400µs/DIV fS = 350kHz 0 1 V 0.1 1 10 100 IN = 24V VOUT = 6V LOAD CURRENT (A) 8550 G33 Rev. 0 For more information www.analog.com 9
