Datasheet LT3956 (Analog Devices) - 6

LT3956 Typical perForMance characTerisTics
TA = 25°C, unless otherwise noted. Quiescent Current INTVCC Current Limit vs Switching Frequency vs Temperature INTVCC Voltage vs Temperature
12 20 7.4 NOT SWITCHING 10 18 7.3 8 16 (V) 6 CC 7.2 CURRENT (mA) 14 INTV 4 CURRENT LIMIT (mA) V IN CC 7.1 INTV 12 2 0 10 7.0 0 200 400 600 800 1000 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 SWITCHING FREQUENCY (kHz) TEMPERATURE (°C) TEMPERATURE (°C) 3956 G13 3956 G14 3956 G15
SW Pin Current Limit LED Current Sense Threshold INTVCC Dropout Voltage vs Duty Cycle vs FB Voltage vs INTVCC Current
4.5 312.5 0 VCTRL = 2V 250.0 –0.5 –40°C 4.0 25°C 187.5 –1.0 3.5 THRESHOLD (mV) 125.0 –1.5 125°C P–ISN) LDO DROPOUT (V) 3.0 SW PIN CURRENT LIMIT (A) V (IS 62.50 –2.0 2.5 0 –2.5 0 25 50 75 100 1.2 1.22 1.24 1.26 1.28 0 3 6 9 12 15 DUTY CYCLE (%) FB VOLTAGE (V) LDO CURRENT (mA) 3956 G17 3956 G18 3956 G16
ISP/ISN Input Bias Current Switch On-Resistance vs CTRL Voltage vs Temperature PWMOUT Waveform
80 180 CPWMOUT = 2.2nF 160 ISP PWM 140 INPUT 60 120 100 PWMOUT 40 ANCE (mΩ) 5V/DIV 80 ISN 60 ON-RESIST INPUT BIAS CURRENT (µA) 20 40 3956 G21 20 200ns/DIV 0 0 0 0.5 1 1.5 2 –50 –25 0 25 50 75 100 125 CTRL (V) TEMPERATURE (°C) 3956 G19 3956 G20 3956f 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 Application Package Description Typical Application Related Parts