Datasheet LTC3868-1 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Low IQ, Dual 2-Phase Synchronous Step-Down Controller |
| Pages / Page | 38 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Pull-Up Current. Shutdown … |
| File Format / Size | PDF / 475 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Pull-Up Current. Shutdown (RUN) Threshold. Regulated Feedback Voltage
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LTC3868-1
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 1.10 0.95 798 RUN PIN VOLTAGE (V) 1.05 0.90 796 SS PULL-UP CURRENT (μA) 1.00 0.85 0.95 794 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) 38681 G19 38681 G20 38681 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 8 –250 400 FREQ = GND CURRENT (μA) –300 – 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) 38681 G22 38681 G23 38681 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) 38681 G28 38681 G25 38681fd 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 1.20 802 1.00 1.15 800 1.10 0.95 798 RUN PIN VOLTAGE (V) 1.05 0.90 796 SS PULL-UP CURRENT (μA) 1.00 0.85 0.95 794 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) 38681 G19 38681 G20 38681 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 8 –250 400 FREQ = GND CURRENT (μA) –300 – 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) 38681 G22 38681 G23 38681 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) 38681 G28 38681 G25 38681fd 7
