Datasheet LTC3375 (Analog Devices) - 10

LTC3375
Typical perForMance characTerisTics 4A Buck Efficiency vs ILOAD, 1A Buck Efficiency vs Frequency 1A Buck Efficiency vs Frequency VOUT = 2.5V (Forced Continuous Mode) (Forced Continuous Mode)
100 100 V 100 IN = 2.25V ILOAD = 100mA 90 90 90 VIN = 3.3V 80 80 ILOAD = 500mA 80 Burst Mode 70 OPERATION 70 70 V I IN = 5.5V LOAD = 20mA 60 60 60 50 50 50 40 VIN = 2.7V 40 40 EFFICIENCY (%) V EFFICIENCY (%) EFFICIENCY (%) IN = 3.3V 30 V 30 30 IN = 5.5V VIN = 2.7V 20 20 V V 20 IN = 3.3V OUT = 1.8V VOUT = 1.8V 10 VIN = 5.5V 10 ILOAD = 100mA 10 VIN = 3.3V L = 3.3µH L = 3.3µH FORCED CONTINUOUS MODE 0 0 0 1 10 100 1000 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 LOAD CURRENT(mA) FREQUENCY (MHz) FREQUENCY (MHz) VOUT = 2.5V 3375 G28 3375 G29 3375 G30 fOSC = 2MHz L = 2.2µH
1A Buck Efficiency vs ILOAD 1A Buck Regulator Load Regulation 4A Buck Regulator Load Regulation (Across Operating Frequency) (Forced Continuous Mode) (Forced Continuous Mode)
100 Burst Mode OPERATION 1.82 1.82 90 1.816 1.816 80 1.812 1.812 70 1.808 VIN = 5.5V 1.808 VIN = 5.5V 60 1.804 1.804 (V) VIN = 3.3V (V) VIN = 3.3V 50 1.8 1.8 V OUT V OUT 40 fOSC = 1MHz, L = 3.3µH 1.796 1.796 EFFICIENCY (%) V f IN = 2.25V V OSC = 2MHz, L = 2.2µH IN = 2.25V 30 fOSC = 3MHz, L = 1µH 1.792 1.792 20 fOSC = 1MHz, L = 3.3µH f 1.788 1.788 OSC = 2MHz, L = 2.2µH DROPOUT 10 f DROPOUT OSC = 3MHz, L = 1µH 1.784 fOSC = 2MHz 1.784 fOSC = 2MHz FORCED CONTINUOUS MODE L = 2.2µH L = 2.2µH 0 1.78 1.78 1 10 100 1000 1 10 100 1000 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) VOUT = 1.8V 3375 G31 3375 G32 3375 G33 VIN = 3.3V
4A Buck Regulator No Load 1A Buck Regulator Line Regulation 1A Buck Regulator No Load Startup Transient (Forced Continuous Mode) Startup Transient (Burst Mode) (Forced Continuous Mode)
1.82 1.815 1.81 1.805 VOUT VOUT 500mV/DIV 500mV/DIV (V) ILOAD = 100mA 1.8 INDUCTOR INDUCTOR V OUT ILOAD 500mA CURRENT CURRENT 1.795 500mA/DIV 500mA/DIV 1.79 EN EN 2V/DIV 2V/DIV 3375 G35 3375 G36 1.785 f 200µs/DIV 200µs/DIV OSC = 2MHz L = 2.2µH 1.782.25 2.75 3.25 3.75 4.25 4.75 5.25 VIN (V) 3375 G34 3375fd 10 For more information www.linear.com/3375 Document Outline Features Applications Description Typical Application Table of Contents Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Buck Switching Regulators Buck Regulators with Combined Power Stages Pushbutton Interface Power-Up and Power-Down Via Pushbutton Power-Up and Power-Down Via Enable Pin or I2C I2C Interface I2C Bus Speed I2C Start and Stop Conditions I2C Byte Format I2C Acknowledge I2C Slave Address I2C Sub-Addressed Writing I2C Bus Write Operation I2C Bus Read Operation Error Condition Reporting Via RST and IRQ Pins Temperature Monitoring and Overtemperature Protection RESET_ALL Functionality Programming the Operating Frequency VCC Shunt Regulator Watchdog Timer Applications Information Buck Switching Regulator Output Voltage and Feedback Network Buck Regulators Combined Buck Regulators VCC Shunt Regulator Input and Output Decoupling Capacitor Selection Choosing the CT Capacitor Programming the Global Register Programming the RST and IRQ Mask Registers Status Byte Read Back Typical Applications Package Description Typical Application Related Parts