Datasheet LTC3374A (Analog Devices) - 8

LTC3374A
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. 3A Buck Efficiency vs ILOAD, 3A Buck Efficiency vs ILOAD, 3A Buck Efficiency vs ILOAD, VOUT = 1.2V VOUT = 1.8V VOUT = 2.5V
100 100 100 90 90 90 80 80 80 70 Burst Mode 70 Burst Mode 70 Burst Mode OPERATION L = 0.8µH L = 0.8µH L = 0.8µH 60 60 OPERATION 60 OPERATION L DCR = 5mΩ L DCR = 5mΩ L DCR = 5mΩ 50 fOSC = 2MHz 50 fOSC = 2MHz 50 fOSC = 2MHz V V V 40 IN = 2.25V IN = 2.5V 40 IN = 2.8V 40 EFFICIENCY (%) VIN = 3.3V V EFFICIENCY (%) IN = 3.3V V EFFICIENCY (%) IN = 3.3V 30 VIN = 5.5V 30 VIN = 5.5V 30 VIN = 5.5V VIN = 2.25V VIN = 2.5V VIN = 2.8V 20 V 20 20 IN = 3.3V VIN = 3.3V VIN = 3.3V V 10 IN = 5.5V VIN = 5.5V 10 VIN = 5.5V 10 FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE 0 0 0 1m 10m 100m 1 3 1m 10m 100m 1 3 1m 10m 100m 1 3 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 3374A G27 3374A G28 3374A G29
4A Buck Efficiency vs ILOAD, 4A Buck Efficiency vs ILOAD, 4A Buck Efficiency vs ILOAD, VOUT = 1.2V VOUT = 1.8V VOUT = 2.5V
100 100 100 90 90 90 80 80 80 70 Burst Mode 70 Burst Mode 70 Burst Mode OPERATION L = 0.6µH OPERATION L = 0.6µH Burst Mode 60 60 60 OPERATION L = 0.6µH L DCR = 4mΩ L DCR = 4mΩ L DCR = 4mΩ 50 f f OSC = 2MHz 50 fOSC = 2MHz 50 OSC = 2MHz V V 40 IN = 2.25V VIN = 2.5V 40 IN = 2.8V 40 EFFICIENCY (%) V V IN = 3.3V VIN = 3.3V EFFICIENCY (%) IN = 3.3V EFFICIENCY (%) 30 V V IN = 5.5V 30 VIN = 5.5V 30 IN = 5.5V V V IN = 2.25V VIN = 2.5V IN = 2.8V 20 V 20 20 V IN = 3.3V VIN = 3.3V IN = 3.3V V 10 V IN = 5.5V VIN = 5.5V 10 IN = 5.5V 10 FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE 0 0 0 1m 10m 100m 1 4 1m 10m 100m 1 4 1m 10m 100m 1 4 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 3374A G30 3374A G31 3374A G32
1A Buck Efficiency vs Frequency 1A Buck Efficiency vs Frequency 1A Buck Efficiency vs ILOAD (Forced Continuous Mode) (Forced Continuous Mode) (Across Operating Frequency)
100 V 100 100 IN = 2.25V ILOAD = 100mA 90 V 90 90 IN = 3.3V I 80 LOAD = 500mA 80 80 70 VIN = 5.5V 70 I 70 FORCED LOAD = 20mA Burst Mode CONTINUOUS 60 60 60 OPERATION MODE 50 50 50 V 40 IN = 3.3V, VOUT = 1.8V 40 40 EFFICIENCY (%) EFFICIENCY (%) f EFFICIENCY (%) OSC = 1MHz, L = 3.3µH 30 30 30 fOSC = 2MHz, L = 2.2µH ILOAD = 100mA f 20 VIN = 3.3V 20 OSC = 3MHz, L = 1.0µH 20 f V OSC = 1MHz, L = 3.3µH OUT = 1.8V 10 VOUT = 1.8V 10 f 10 OSC = 2MHz, L = 2.2µH L = 3.3µH L = 3.3µH fOSC = 3MHz, L = 1.0µH 0 0 0 1 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 1 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 1m 10m 100m 1 FREQUENCY (MHz) FREQUENCY (MHz) LOAD CURRENT (A) 3374A G33 3374A G34 3374A G35 3374af 8 For more information www.linear.com/LTC3374A Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information (http://www.linear.com/product/LTC3374A#orderinfo) Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Buck Switching Regulators Buck Regulators with Combined Power Stages Power Failure Reporting Via PGOOD_ALL Pin Temperature Monitoring and Overtemperature Protection Programming the Operating Frequency Applications Information Buck Switching Regulator Output Voltage and Feedback Network Input and Output Decoupling Capacitor Selection Combined Buck Regulators Buck Regulators PCB Considerations Package Description Typical Application Related Parts