Datasheet LTC3808 (Analog Devices) - 5

LTC3808
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25
°
C unless otherwise noted. Start-Up with Coincident Tracking Start-Up with Coincident Tracking Start-Up with Ratiometric (VOUT = 0V at 0s) (VOUT = 0.8V at 0s) Tracking (VOUT = 0V at 0s)
Vx Vx Vx 2.5V 2.5V 2.5V VOUT VOUT VOUT 1.8V 1.8V 1.8V 500mV/DIV 500mV/DIV 500mV/DIV 10ms/DIV 3808 G09 10ms/DIV 3808 G10 10ms/DIV 3808 G11 VIN = 4.2V VIN = 4.2V VIN = 4.2V RTA = 590Ω RTA = 590Ω RTA = 590Ω RTB = 1.18k RTB = 1.18k RTB = 1.69k FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT
Regulated Feedback Voltage vs Undervoltage Lockout Threshold Shutdown (RUN) Threshold vs Temperature vs Temperature Temperature
0.606 2.55 1.20 2.50 0.604 VIN RISING 2.45 1.15 0.602 2.40 0.600 2.35 1.10 2.30 0.598 INPUT VOLTAGE (V) V RUN VOLTAGE (V) IN FALLING FEEDBACK VOLTAGE (V) 2.25 1.05 0.596 2.20 0.594 2.15 1.00 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3808 G12 3808 G13 3808 G14
Maximum Current Sense TRACK/SS Start-Up Current vs Threshold vs Temperature Temperature
135 1.04 IPRG = FLOAT TRACK/SS = 0V A) µ 1.02 130 1.00 125 0.98 120 0.96 TRACK/SS START-UP CURRENT ( MAXIMUM CURRENT SENSE THRESHOLD (mV) 115 0.94 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) 3808 G16 3808 G17 3808f 5