Datasheet LTC3809-1 (Analog Devices) - 5

LTC3809-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Start-Up with Coincident Tracking Start-Up with Coincident Tracking Start-Up with Ratiometric Tracking (VOUT = 0V at 0s) (VOUT = 0.8V at 0s) (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 38091 G09 10ms/DIV 38091 G10 10ms/DIV 38091 G11 VIN = 4.2V VIN = 4.2V VIN = 4.2V RTA = 590 RTA = 590 RTA = 590 RTB = 1.18k RTB = 1.18k RTB = 1.69k FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT
Regulated Feedback Voltage Undervoltage Lockout Threshold Shutdown (RUN) Threshold vs Temperature vs Temperature vs Temperature
0.606 2.55 1.20 2.50 0.604 VIN RISING 2.45 1.15 0.602 2.40 TAGE (V) TAGE (V) 0.600 2.35 TAGE (V) 1.10 2.30 0.598 INPUT VOL V RUN VOL IN FALLING FEEDBACK VOL 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) 38091 G012 38091 G13 38091 G14
Maximum Current Sense TRACK/SS Start-Up Current Threshold vs Temperature vs Temperature
135 1.04 IPRG = FLOAT TRACK/SS = 0V 1.02 130 1.00 125 T-UP CURRENT (μA) AR 0.98 120 0.96 TRACK/SS ST 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) 38091 G15 38091 G16 38091fc 5