Datasheet LTC3857-1 (Analog Devices) - 7

LTC3857-1
TYPICAL PERFORMANCE CHARACTERISTICS TRACK/SS Pull-Up Current Shutdown (RUN) Threshold Regulated Feedback Voltage vs Temperature vs Temperature vs Temperature
1.10 1.40 800 806 1.35 1.05 804 1.30 RUN RISING 802 1.00 1.25 800 RUN FALLING 798 1.20 RUN PIN VOLTAGE (V) TRACK/SS CURRENT (μA) 0.95 796 1.15 794 REGULATED FEEDBACK VOLTAGE (mV) 0.90 1.10 792 –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) 38571 G19 38571 G20 3857 G21
SENSE– Pin Input Current Shutdown Current Oscillator Frequency vs Temperature vs Input Voltage vs Temperature
50 30 600 0 –50 VOUT < INTVCC – 0.5V FREQ = INTV 25 550 CC –100 –150 20 500 –200 –250 15 450 –300 – CURRENT (μA) –350 –400 10 FREQUENCY (kHz) 400 INPUT CURRENT (μA) SENSE –450 FREQ = GND –500 5 350 VOUT > INTVCC – 0.5V –550 –600 0 300 –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) 38571 G22 38571 G23 38571 G24
Undervoltage Lockout Threshold Oscillator Frequency vs Temperature vs Input Voltage Shutdown Current vs Temperature
4.4 356 20 FREQ = GND 4.3 18 354 4.2 16 4.1 352 14 4.0 3.9 350 12 VOLTAGE (V) CC 3.8 10 348 INTV 3.7 8 SHUTDOWN CURRENT (μA) 3.6 OSCILATOR FREQUENCY (kHz) 346 6 3.5 3.4 344 4 –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) 38571 G25 38571 G26 38571 G27 38571fc 7 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS FUNCTIONAL DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS