Datasheet LT3640 (Analog Devices) - 7

LT3640 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 0.5A/DIV 0.5A/DIV 100 80 SW2 SW2 5V/DIV 5V/DIV 60 40 IL2 I 0.5A/DIV L2 0.5A/DIV 20 ATCHDOG UPPER BOUNDAR W 0 3640 G18 3640 G19 200ns/DIV 500ns/DIV 0 1000 2000 3000 4000 5000 V C IN1 = 12V VIN2 = VOUT1 VIN1 = 12V VIN2 = VOUT1 WDT CAPACITANCE (pF) V 3640 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 ATCHDOG UPPER BOUNDAR W 0 0 –50 0 50 100 150 0 0.5 1 1.5 2 TEMPERATURE (°C) RST/WDO VOLTAGE (V) 3640 G21 3640 G22 3640f Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts