Datasheet LT3694, LT3694-1 (Analog Devices) - 5

LT3694/LT3694-1
TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, TA = 25°C, unless otherwise noted. BST Pin Current Efficiency at VOUT = 5V Switch VCESAT vs Switch Current vs Switch Current
100 0.8 70 fSW = 800kHz VIN = 6.3V 0.7 60 90 VIN = 12V 0.6 50 (V) 80 T 0.5 40 CESA V 0.4 IN = 36V 70 30 EFFICIENCY (%) 0.3 SWITCH V 20 60 0.2 BOOST PIN CURRENT (mA) 10 0.1 50 0 1 2 3 0 0 I 0 1 2 3 0 1 2 3 OUT (A) 36941 G01 SWITCH CURRENT (A) SWITCH CURRENT (A) 36941 G02 36941 G03
Switch Current Limit Switch Current Limit Switch Minimum On-Time and vs Temperature vs Duty Cycle Off-Time vs Temperature
5.0 5.0 160 ISW = 1A 140 –45°C 25°C MINIMUM 4.5 4.5 120 ON-TIME (A) (A) 150°C 100 LIM LIM 4.0 MINIMUM 4.0 80 OFF-TIME TIME (ns) SWITCH I 60 SWITCH I 3.5 3.5 40 20 3.0 3.0 0 –50 0 50 100 150 0 20 40 60 80 100 –50 0 50 100 150 TEMPERATURE (°C) SWITCH DUTY CYCLE (%) TEMPERATURE (°C) 36941 G04 36941 G06 36941 G05
VFB vs Temperature Frequency vs RT Frequency Shift vs Temperature
760 3.0 5 RT = 200k 758 4 2.5 756 3 RT = 40.2k 754 2 2.0 752 1 RT = 10.7k (mV) 750 1.5 0 V FB 748 –1 1.0 746 FREQUENCY (MHz) –2 744 –3 0.5 742 NORMALIZED FREQUENCY SHIFT (%) –4 740 0 –5 –50 0 50 100 150 0 50 100 150 200 –50 0 50 100 150 TEMPERATURE (°C) RT (k) TEMPERATURE (°C) 36941 G07 36941 G08 36941 G09 36941fb 5 Document Outline Features Applications Description 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 Typical Application Related Parts