Datasheet LT8494 (Analog Devices) - 5

LT8494
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specified. Transient Load Response, Load Current is Stepped from 300mA Switch Current Limit at Minimum to 500mA Switch Current Limit at 500kHz Duty Cycle
3.0 3.0 VOUT 2.5 2.5 50mV/DIV 2.0 2.0 IL 0.5A/DIV 1.5 1.5 500µs/DIV FRONT PAGE APPLICATION 1.0 1.0 V 8494 G19 IN = 12V V SWITCH CURRENT LIMIT (A) SWITCH CURRENT LIMIT (A) OUT = 5V 0.5 0.5 0.0 0 10 20 30 40 50 60 70 80 90 –50 0 50 100 150 DUTY CYCLE (%) TEMPERATURE (°C) 8494 G06 8494 G07
Switch VCESAT Feedback Voltage Oscillator Frequency
600 1.23 1.5 500 1.22 RT = 68.1k 400 1.0 (mV) T 1.21 CESA 300 TAGE (V) 1.20 200 FB VOL FREQUENCY (MHz) 0.5 SWITCH V RT = 324k 1.19 100 0 1.18 0.0 0 0.5 1.0 1.5 2.0 –50 0 50 100 150 –50 0 50 100 150 SWITCH CURRENT (A) TEMPERATURE (°C) TEMPERATURE (°C) 8494 G08 8494 G09 8494 G11
Frequency Foldback Minimum Switch On-Time Minimum Switch Off-Time
1200 140 180 120 160 1000 RT = 68.1k 140 100 800 120 80 100 600 60 80 400 60 SWITCH ON-TIME (ns) 40 SWITCH OFF-TIME (ns) RT = 324k 40 SWITCHING FREQUENCY (kHz) 200 20 20 0 0 0 0 0.2 0.5 0.7 1.0 1.2 –50 0 50 100 150 –50 0 50 100 150 FB VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 8494 G12 8494 G13 8494 G14 8494fa For more information www.linear.com/LT8494 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts