Datasheet LTC3858-2 (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | Low IQ, Dual 2-Phase Synchronous Step-Down Controller |
| 页数 / 页 | 40 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Pull-Up Current. Shutdown … |
| 文件格式/大小 | PDF / 448 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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LTC3858-2
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 1.05 802 1.20 1.00 1.15 800 0.95 1.10 798 1.05 0.90 RUN PIN VOLTAGE (V) 796 SS PULL-UP CURRENT (μA) 1.00 0.85 794 0.95 REGULATED FEEDBACK VOLTAGE (mV) 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) 38582 G19 38582 G20 38582 G21
SENSE– Pin Input Current Shutdown Input 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 8 –250 400 FREQ = GND CURRENT (μA) –300 – 6 –350 300 FREQUENCY (kHz) –400 SENSE INPUT CURRENT (μA) 4 200 –450 –500 V 2 100 OUT = 28V –550 –600 0 0 –45 –20 5 30 55 80 105 130 5 10 15 20 25 30 35 40 –45 –20 5 30 55 80 105 130 TEMPERATURE (°C) INPUT VOLTAGE (V) TEMPERATURE (°C) 38582 G22 38582 G23 38582 G24
Oscillator Frequency Undervoltage Lockout Threshold vs Input Voltage vs Temperature INTVCC vs Load Current
356 4.4 5.50 FREQ = GND VIN = 12V 4.3 354 5.25 4.2 EXTVCC = 0V 4.1 352 5.00 EXTVCC = 8.5V 4.0 350 3.9 4.75 VOLTAGE (V) VOLTAGE (V) CC 3.8 CC 348 4.50 EXTVCC = 5V INTV 3.7 INTV OSCILLATOR FREQUENCY (kHz) 3.6 346 4.25 3.5 344 3.4 4.00 5 10 15 20 25 30 35 40 –45 –20 5 30 55 80 105 130 0 20 40 60 80 100 INPUT VOLTAGE (V) TEMPERATURE (°C) LOAD CURRENT (mA) 38582 G25 38582 G26 38582 G27 38582f 7
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 1.05 802 1.20 1.00 1.15 800 0.95 1.10 798 1.05 0.90 RUN PIN VOLTAGE (V) 796 SS PULL-UP CURRENT (μA) 1.00 0.85 794 0.95 REGULATED FEEDBACK VOLTAGE (mV) 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) 38582 G19 38582 G20 38582 G21
SENSE– Pin Input Current Shutdown Input 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 8 –250 400 FREQ = GND CURRENT (μA) –300 – 6 –350 300 FREQUENCY (kHz) –400 SENSE INPUT CURRENT (μA) 4 200 –450 –500 V 2 100 OUT = 28V –550 –600 0 0 –45 –20 5 30 55 80 105 130 5 10 15 20 25 30 35 40 –45 –20 5 30 55 80 105 130 TEMPERATURE (°C) INPUT VOLTAGE (V) TEMPERATURE (°C) 38582 G22 38582 G23 38582 G24
Oscillator Frequency Undervoltage Lockout Threshold vs Input Voltage vs Temperature INTVCC vs Load Current
356 4.4 5.50 FREQ = GND VIN = 12V 4.3 354 5.25 4.2 EXTVCC = 0V 4.1 352 5.00 EXTVCC = 8.5V 4.0 350 3.9 4.75 VOLTAGE (V) VOLTAGE (V) CC 3.8 CC 348 4.50 EXTVCC = 5V INTV 3.7 INTV OSCILLATOR FREQUENCY (kHz) 3.6 346 4.25 3.5 344 3.4 4.00 5 10 15 20 25 30 35 40 –45 –20 5 30 55 80 105 130 0 20 40 60 80 100 INPUT VOLTAGE (V) TEMPERATURE (°C) LOAD CURRENT (mA) 38582 G25 38582 G26 38582 G27 38582f 7