Datasheet LTC3868 (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | Low IQ, Dual 2-Phase Synchronous Step-Down Controller |
| 页数 / 页 | 38 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Pull-Up Current. Shutdown … |
| 文件格式/大小 | PDF / 406 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Pull-Up Current. Shutdown (RUN) Threshold. Regulated Feedback Voltage
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LTC3868
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start Pull-Up Current Shutdown (RUN) Threshold Regulated Feedback Voltage vs Temperature vs Temperature vs Temperature
1.20 1.40 808 1.35 1.15 806 1.30 1.10 804 1.25 1.05 1.20 802 1.00 1.15 800 0.95 1.10 798 RUN PIN VOLTAGE (V) 1.05 SS PULL-UP CURRENT (µA) 0.90 796 1.00 0.85 0.95 REGULATED FEEDBACK VOLTAGE (mV) 794 0.80 0.90 792 –45 –20 5 30 55 80 105 130 –45 –20 5 30 55 80 105 130 –45 –20 5 30 55 80 105 130 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3868 G19 3868 G20 3868 G21
SENSE– Pin Input Current Shutdown Current Oscillator Frequency vs Temperature vs Input Voltage vs Temperature
50 14 800 0 –50 VOUT = 3.3V 12 700 –100 600 FREQ = INTVCC –150 10 –200 500 –250 8 400 FREQ = GND –300 – CURRENT (µA) 6 –350 300 –400 FREQUENCY (kHz) SENSE INPUT CURRENT (µA) 4 –450 200 –500 V 2 OUT = 28V 100 –550 –600 0 0 –45 –20 5 30 55 80 105 130 5 10 15 20 25 28 –45 –20 5 30 55 80 105 130 TEMPERATURE (°C) INPUT VOLTAGE (V) TEMPERATURE (°C) 3868 G22 3868 G23 3868 G24
Oscillator Frequency Undervoltage Lockout Threshold vs Input Voltage vs Temperature
356 4.4 4.3 354 4.2 4.1 352 4.0 350 3.9 VOLTAGE (V) CC 3.8 348 INTV 3.7 3.6 OSCILLATOR FREQUENCY (kHz) 346 3.5 344 3.4 5 10 15 20 25 28 –45 –20 5 30 55 80 105 130 INPUT VOLTAGE (V) TEMPERATURE (°C) 3868 G28 3868 G25 3868fe For more information www.linear.com/LTC3868 7 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Typical Performance Characteristics Pin Functions Operation Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start Pull-Up Current Shutdown (RUN) Threshold Regulated Feedback Voltage vs Temperature vs Temperature vs Temperature
1.20 1.40 808 1.35 1.15 806 1.30 1.10 804 1.25 1.05 1.20 802 1.00 1.15 800 0.95 1.10 798 RUN PIN VOLTAGE (V) 1.05 SS PULL-UP CURRENT (µA) 0.90 796 1.00 0.85 0.95 REGULATED FEEDBACK VOLTAGE (mV) 794 0.80 0.90 792 –45 –20 5 30 55 80 105 130 –45 –20 5 30 55 80 105 130 –45 –20 5 30 55 80 105 130 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3868 G19 3868 G20 3868 G21
SENSE– Pin Input Current Shutdown Current Oscillator Frequency vs Temperature vs Input Voltage vs Temperature
50 14 800 0 –50 VOUT = 3.3V 12 700 –100 600 FREQ = INTVCC –150 10 –200 500 –250 8 400 FREQ = GND –300 – CURRENT (µA) 6 –350 300 –400 FREQUENCY (kHz) SENSE INPUT CURRENT (µA) 4 –450 200 –500 V 2 OUT = 28V 100 –550 –600 0 0 –45 –20 5 30 55 80 105 130 5 10 15 20 25 28 –45 –20 5 30 55 80 105 130 TEMPERATURE (°C) INPUT VOLTAGE (V) TEMPERATURE (°C) 3868 G22 3868 G23 3868 G24
Oscillator Frequency Undervoltage Lockout Threshold vs Input Voltage vs Temperature
356 4.4 4.3 354 4.2 4.1 352 4.0 350 3.9 VOLTAGE (V) CC 3.8 348 INTV 3.7 3.6 OSCILLATOR FREQUENCY (kHz) 346 3.5 344 3.4 5 10 15 20 25 28 –45 –20 5 30 55 80 105 130 INPUT VOLTAGE (V) TEMPERATURE (°C) 3868 G28 3868 G25 3868fe For more information www.linear.com/LTC3868 7 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Typical Performance Characteristics Pin Functions Operation Package Description Typical Application Related Parts