Datasheet LT3680 (Analog Devices) - 4

LT3680
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Efficiency Efficiency Efficiency
100 100 100 3.0 VIN = 12V 90 90 VIN = 12V 90 2.5 TOTAL POWER LOSS (W) VIN = 34V 80 VIN = 24V 80 VIN = 34V 80 2.0 VIN = 24V 70 70 70 1.5 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) V 60 IN = 12V V 60 1.0 OUT = 5V 60 VOUT = 3.3V VOUT = 5V L = 4.7µH L = 3.3µH L = 4.7µH f = 600kHz f = 600kHz f = 600kHz 50 50 50 0.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 OUTPUT CURRENT (A) OUTPUT CURRENT (A) OUTPUT CURRENT (A) 3680 G01 3680 G02 3680 G03
No Load Supply Current No Load Supply Current Maximum Load Current
130 5.5 V 400 OUT = 3.3V CATCH DIODE: DIODES, INC. PDS360 350 TYPICAL 110 VIN = 12V 5.0 300 VOUT = 3.3V 90 INCREASED SUPPLY 4.5 250 CURRENT DUE TO CATCH MINIMUM DIODE LEAKAGE AT 70 200 HIGH TEMPERATURE 4.0 150 50 LOAD CURRENT (A) 3.5 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 100 VOUT = 3.3V 30 3.0 TA = 25°C 50 L = 4.7µH f = 600kHz 10 0 2.5 0 5 10 15 20 25 30 35 –50 –25 0 25 50 75 100 125 150 5 10 15 20 25 30 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT VOLTAGE (V) 3680 G04 3680 G05 3680 G06
Maximum Load Current Switch Current Limit Switch Current Limit
5.5 6.0 6.5 6.0 TYPICAL 5.5 5.0 5.5 DUTY CYCLE = 10 % 5.0 5.0 4.5 DUTY CYCLE = 90 % MINIMUM 4.5 4.5 4.0 4.0 4.0 LOAD CURRENT (A) 3.5 VOUT = 5V SWITCH CURRENT LIMIT(A) 3.5 SWITCH CURRENT LIMIT (A) 3.0 TA = 25°C 3.5 L = 4.7µH 2.5 f = 600kHz 3.0 3.0 2.0 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) 3680 G07 3680 G08 3680 G09 Rev C 4 For more information www.analog.com 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