Datasheet LT3507 (Analog Devices) - 5

LT3507
typical perForMance characteristics Efficiency vs Load Current, Efficiency vs Load Current, Switch VCESAT vs Switch Current, Channel 1, VOUT = 1.8V Channels 2 and 3, VOUT = 3.3V Channels 1, 2 and 3
90 100 T 0.6 A = 25°C TA = 25°C TA = 25°C fSW = 450kHz fSW = 450kHz 90 80 V 0.5 IN = 6V VIN = 6V CHANNELS 2 & 3 V VIN = 12V IN = 12V 80 0.4 70 VIN = 36V CHANNEL 1 V (V) IN = 36V 70 0.3 60 V SW EFFICIENCY (%) EFFICIENCY (%) 60 0.2 50 50 0.1 40 40 0 0 0.5 1 1.5 2 2.5 0 0.3 0.6 0.9 1.2 1.5 0 0.5 1 1.5 2 2.5 3 IOUT (A) IOUT (A) ISW (A) 3507 G01 3507 G02 3507 G03
BOOST Pin Current vs Switch Current, Channels 1, 2 and 3 VFB vs Temperature Frequency vs RT
100 805 2.5 TA = 25°C TA = 25°C 90 804 80 803 70 802 CHANNELS 2 & 3 60 801 (mA) 50 (mV) 800 CHANNEL 1 I BOOST 40 V FB 799 30 798 FREQUENCY (MHz) 20 797 10 796 0 795 0.25 0 0.5 1 1.5 2 2.5 3 –50 –30 –10 30 50 70 90 110 130 150 10 100 ISW (A) TEMPERATURE (°C) RT (kΩ) 3507 G04 3507 G05 3507 G06
Frequency vs Temperature Frequency vs VFB (Foldback) ITRK/SS vs Temperature
0.5 1200 1.30 RT = 40.2k TA = 25°C 0.0 1000 1.28 800 TION (%) –0.5 1.26 (µA) 600 –1.0 I TRK/SS 1.24 FRERQUENCY (kHz) 400 FREQUENCY DEVIA –1.5 1.22 200 –2.0 0 1.20 –50 –30 –10 30 50 70 90 110 130 150 0 0.2 0.4 0.6 0.8 1 –50 –30 –10 30 50 70 90 110 130 150 TEMPERATURE (°C) VFB (V) TEMPERATURE (°C) 3507 G07 3507 G08 3507 G09 3507fb For more information www.linear.com/LT3507 5