Datasheet LT3922 (Analog Devices) - 6

LT3922
Typical perForMance characTerisTics VIN = 12V, TA = 25°C, unless otherwise noted. INTVCC and VREF UVLO Falling VREF Line Regulation Thresholds Minimum Off Time
2.010 3.0 30 2.008 2.7 25 2.006 2.004 2.4 20 2.002 TAGE (V) 2.1 2.000 TAGE (V) 15 1.998 1.8 VOL 10 1.996 1.5 THRESHOLD VOL MINIMUM OFF TIME (ns) 1.994 1.2 5 1.992 INTVCC UVLO VREF UVLO 1.990 0.9 0 0 3 6 9 12 15 18 21 24 27 30 33 36 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 VIN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3922 G10 3922 G11 3922 G12
RT and RP Pin Current Limits SS Currents SS Thresholds
80 25 2.0 75 20 1.6 70 15 TAGE (V) 1.2 PULL-UP CURRENT SS HIGH PULL-DOWN CURRENT SS LOW 65 10 0.8 CURRENT (µA) THRESHOLD VOL MAXIMUM PIN CURRENT (µA) 60 5 0.4 RT PIN RP PIN 55 0 0 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3922 G13 3922 G14 3922 G15
Switching Frequency Internal PWM Frequency Internal PWM Duty Cycle
2200 260 8320 140 10.5 RT = 45.3k RT = 45.3k 2100 250 RP = 332k VREF 18.2k 7936 134 10.4 2000 240 1% PWM 1900 230 22.1k 7552 128 Y CYCLE (%) 10.3 LT3922 1% 1800 220 WM FREQUENCY (Hz) WM DUT 1700 210 7168 122 10.2 1600 200 SWITCHING FREQUENCY (kHz) 6784 116 10.1 1500 INTERNAL P R INTERNAL P T = 45.3k 190 RP = 28.7k RT = 499k RP = 332k 1400 180 6400 110 10.0 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 –45 –20 5 30 55 80 105 130 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3922 G16 3922 G17 3922 G18 3922fa 6 For more information www.linear.com/LT3922 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts