Datasheet LTC3371 (Analog Devices) - 10

LTC3371
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. 1A Buck Efficiency vs Frequency 1A Buck Efficiency vs Frequency 1A Buck Regulator Load Regulation (Forced Continuous Mode) (Forced Continuous Mode) (Forced Continuous Mode)
100 100 1.82 VIN = 3.3V ILOAD = 100mA f 90 90 1.816 OSC = 2MHz V L = 2.2µH IN = 2.25V I 80 80 LOAD = 500mA 1.812 VIN = 5.5V 70 70 ILOAD = 20mA 1.808 60 60 1.804 VIN = 5.5V V 50 50 1.8 IN = 3.3V 40 40 1.796 VIN = 2.25V EFFICIENCY (%) EFFICIENCY (%) 30 30 POWER LOSS (mW) 1.792 DROPOUT 20 V 20 1.788 OUT = 1.8V VOUT = 1.8V 10 ILOAD = 200mA 10 VIN = 3.3V 1.784 L = 3.3µH L = 3.3µH 0 0 1.78 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 1 10 100 1000 FREQUENCY (MHz) FREQUENCY (MHz) LOAD CURRENT (mA) 3371 G37 3371 G38 3371 G39
4A Buck Regulator Load Regulation 1A Buck Regulator Line Regulation 1A Buck Regulator No-Load Startup (Forced Continuous Mode) (Forced Continuous Mode) Transient (Burst Mode Operation)
1.82 1.82 f f VIN = 3.3V 1.816 OSC = 2MHz OSC = 2MHz L = 2.2µH 1.815 L = 2.2µH VOUT = 1.8V 1.812 1.81 1.808 V VOUT 1.804 IN = 5.5V 1.805 500mV/DIV (V) V ILOAD = 100mA 1.8 IN = 3.3V (V) 1.8 INDUCTOR V OUT I CURRENT 1.796 V LOAD = 500mA IN = 2.25V V OUT1.795 500mA/DIV 1.792 1.79 EN 1.788 2V/DIV DROPOUT 3371 G42 1.784 1.785 200µs/DIV 1.78 1.78 1 10 100 1000 2.5 3 3.5 4 4.5 5 5.5 LOAD CURRENT (mA) VIN (V) 3371 G41 3371 G40
1A Buck Regulator No-Load Startup 4A Buck Regulator No-Load Startup 4A Buck Regulator No-Load Startup Transient (Forced Continuous Mode) Transient (Burst Mode Operation) Transient (Forced Continuous Mode)
VIN = 3.3V VIN = 3.3V VIN = 3.3V VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V VOUT 500mV/DIV VOUT VOUT 500mV/DIV 500mV/DIV INDUCTOR INDUCTOR INDUCTOR CURRENT CURRENT CURRENT 500mA/DIV 500mA/DIV 500mA/DIV EN EN EN 2V/DIV 2V/DIV 2V/DIV 3371 G43 3371 G44 3371 G45 200µs/DIV 200µs/DIV 200µs/DIV 3371fb 10 For more information www.linear.com/LTC3371 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Buck Switching Regulators Buck Regulators with Combined Power Stages Power Failure Reporting Via RST Pins Temperature Monitoring and Overtemperature Protection Programming the Operating Frequency Windowed Watchdog Timer Choosing the CT Capacitor Applications Information Buck Switching Regulator Output Voltage and Feedback Network Buck Regulators Combined Buck Power Stages Input and Output Decoupling Capacitor Selection PCB Considerations Typical Applications Package Description Revision History Typical Application Related Parts