Datasheet LTC3858 (Analog Devices) - 7

LTC3858
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) 3858 G19 3858 G20 22554 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 –250 8 400 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 30 35 40 –45 –20 5 30 55 80 105 130 TEMPERATURE (°C) INPUT VOLTAGE (V) TEMPERATURE (°C) 3858 G22 3858 G23 3858 G24
Oscillator Frequency Undervoltage Lockout Threshold vs Input Voltage vs Temperature
356 4.4 FREQ = GND 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 30 35 40 –45 –20 5 30 55 80 105 130 INPUT VOLTAGE (V) TEMPERATURE (°C) 3858 G28 3858 G25 3858fc 7