Datasheet LT3641 (Analog Devices) - 7

LT3641
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Watchdog Upper Boundary Full Frequency Waveforms Light Load Operation Waveforms Period vs CWDT
180 160 SW1 SW1 10V/DIV 10V/DIV 140 Y PERIOD (ms) 120 IL1 IL1 100 0.5A/DIV 0.5A/DIV 80 SW2 SW2 5V/DIV 5V/DIV 60 40 IL2 I 0.5A/DIV L2 20 0.5A/DIV TCHDOG UPPER BOUNDAR A W 0 3641 G18 3641 G19 0 1000 2000 3000 4000 5000 200ns/DIV 500ns/DIV C V WDT CAPACITANCE (pF) IN1 = 12V VIN2 = VOUT1 VIN1 = 12V VIN2 = VOUT1 V 3641 G20 OUT1 = 3.3V/0.5A VOUT2 = 1.8V/0.5A VOUT1 = 3.3V/25mA VOUT2 = 1.8V/30mA
Watchdog Upper Boundary Period vs Temperature RST/WDO Pull-Up Current
35 20 30 15 Y PERIOD (ms) 25 20 10 15 PULL-UP CURRENT (μA) 10 WDO/ 5 5 RST TCHDOG UPPER BOUNDAR A W 0 0 –50 0 50 100 150 0 0.5 1 1.5 2 TEMPERATURE (°C) RST/WDO VOLTAGE (V) 3641 G21 3641 G22 3641fa 7