Datasheet LT1912 (Analog Devices) - 4

LT1912
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency Efficiency Maximum Load Current
100 90 4.0 VIN = 7V V 85 IN = 12V VIN = 12V 90 3.5 TYPICAL 80 V V IN = 34V 3.0 IN = 34V 80 75 VIN = 24V VIN = 24V 70 2.5 70 MINIMUM 65 EFFICIENCY (%) EFFICIENCY (%) LOAD CURRENT (A) 2.0 60 60 V 55 1.5 OUT = 3.3V L: NEC PLC-0745-5R6 L: NEC PLC-0745-5R6 L = 4.7µH V f = 500kHz 50 VOUT = 5V f: 500kHz 50 OUT = 3.3V f: 500kHz 1.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 5 10 15 20 25 30 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 1912 G01 1912 G02 1912 G03
Maximum Load Current Switch Current Limit Switch Current Limit
3.5 4.0 4.5 TYPICAL 4.0 DUTY CYCLE = 10 % 3.5 3.0 3.5 3.0 3.0 2.5 2.5 DUTY CYCLE = 90 % 2.5 MINIMUM 2.0 2.0 2.0 LOAD CURRENT (A) 1.5 SWITCH CURRENT LIMIT(A) 1.5 SWITCH CURRENT LIMIT (A) 1.0 VOUT = 5V 1.5 L = 4.7µH 0.5 f = 500kHz 1.0 1.0 0 5 10 15 20 25 30 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) DUTY CYCLE (%) TEMPERATURE (°C) 1912 G05 1912 G04 1912 G06
Switch Voltage Drop Boost Pin Current
700 80 70 600 60 500 50 400 40 300 TAGE DROP (mV) 30 VOL 200 BOOST PIN CURRENT (mA) 20 100 10 0 0 0 500 1000 1500 2000 2500 0 500 1000 1500 2000 2500 SWITCH CURRENT (mA) SWITCH CURRENT (mA) 1912 G07 1912 G08 1912fa 4 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 Revision History Typical Application Related Parts