Datasheet LT3509 (Analog Devices) - 4

LT3509
Typical perForMance characTerisTics Efficiency vs Load Current Efficiency vs Load Current Efficiency vs Load Current VOUT = 5V, fSW = 2.0MHz VOUT = 3.3V, fSW = 2.0MHz VOUT = 1.8V, fSW = 0.7MHz
95 95 90 TA = 25ºC TA = 25ºC TA = 25ºC 90 90 85 VIN = 12V 85 85 80 VIN = 12V 80 75 80 VIN = 12V VIN = 24V 75 70 75 EFFICIENCY (%) EFFICIENCY (%) 70 EFFICIENCY (%) 65 70 65 60 65 60 55 60 55 50 0 0.2 0.4 0.6 0.8 0 0.2 0.4 0.6 0.8 0 0.2 0.4 0.6 0.8 ILOAD(A) ILOAD(A) ILOAD(A) 3509 G01 3509 G02 3509 G03
Switch VCE(SAT) vs ISW IBOOST vs ISW
0.35 25 TA = 25ºC TA = 25ºC 0.3 20 0.25 (V) 0.2 15 T) (mA) 0.15 V CE(SA I BOOST 10 0.1 5 0.05 0 0 0 0.2 0.4 0.6 0.8 1.0 0 0.2 0.4 0.6 0.8 1 ISW(A) ISW(A) 3509 G04 3509 G05
Boost Diode Characteristics Frequency vs RT
1.2 2.2 TA = 25ºC T 2.0 A = 25ºC 1 0.8 1.5 (V) 0.6 V f 1.0 0.4 FREQUENCY (MHz) 0.5 0.2 0 0 0 50 100 150 0 20 40 60 80 100 120 140 160 180 BOOST DIODE CURRENT (mA) RT(kΩ) 3509 G06 3509 G07 3509fd 4 For more information www.linear.com/LT3509 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Related Parts