Datasheet LTC3375 (Analog Devices) - 9

LTC3375
Typical perForMance characTerisTics VSHNT Clamp Voltage 1A Buck Efficiency vs ILOAD, VCC vs Temperature vs Temperature VOUT = 1.8V
3.40 6.20 100 Burst Mode OPERATION FOR V 3.38 CC FEEDBACK DIVIDER R 6.18 90 TOP = 187k 3.36 RBOT = 107k 6.16 80 3.34 6.14 70 3.32 6.12 60 VOUT = 1.8V Vf = 2MHz (V) 3.30 6.10 50 OUT OSC = 1.8V fOSC = 2MHz L = 2.2µH V CC 3.28 6.08 40 L = 2.2µH VIN = 2.25V CLAMP VOLTAGE (V) EFFICIENCY (%) VIN = 3.3V 3.26 6.06 30 VIN = 5.5V 3.24 V SHNT 6.04 20 VIN = 2.25V VIN = 3.3V 3.22 6.02 10 VIN = 5.5V FORCED CONTINUOUS MODE 3.20 6.00 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 1 10 100 1000 TEMPERATURE (°C) TEMPERATURE (°C) LOAD CURRENT(mA) 3375 G19 3375 G20 3375 G21
1A Buck Efficiency vs ILOAD, 2A Buck Efficiency vs ILOAD, 2A Buck Efficiency vs ILOAD, VOUT = 2.5V VOUT = 1.8V VOUT = 2.5V
100 100 100 90 Burst Mode 90 90 Burst Mode OPERATION Burst Mode 80 80 OPERATION 80 OPERATION 70 70 70 60 VOUT = 2.5V 60 VOUT = 1.8V 60 VOUT = 2.5V fOSC = 2MHz fOSC = 2MHz f 50 OSC = 2MHz L = 2.2µH 50 L = 2.2µH 50 L = 2.2µH 40 VIN = 2.7V 40 VIN = 2.25V 40 VIN = 2.7V EFFICIENCY (%) VIN = 3.3V EFFICIENCY (%) VIN = 3.3V EFFICIENCY (%) VIN = 3.3V 30 VIN = 5.5V 30 VIN = 5.5V 30 VIN = 5.5V 20 VIN = 2.7V VIN = 2.25V VIN = 2.7V V 20 20 IN = 3.3V VIN = 3.3V VIN = 3.3V 10 VIN = 5.5V 10 VIN = 5.5V 10 VIN = 5.5V FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE 0 0 0 1 10 100 1000 1 10 100 1000 1 10 100 1000 LOAD CURRENT(mA) LOAD CURRENT(mA) LOAD CURRENT(mA) 3375 G22 3375 G23 3375 G24
3A Buck Efficiency vs ILOAD, 3A Buck Efficiency vs ILOAD, 4A Buck Efficiency vs ILOAD, VOUT = 1.8V VOUT = 2.5V VOUT = 1.8V
100 100 100 90 90 90 80 80 80 Burst Mode 70 Burst Mode 70 Burst Mode OPERATION 70 OPERATION OPERATION 60 VOUT = 1.8V 60 VOUT = 2.5V 60 VOUT = 1.8V fOSC = 2MHz f f 50 OSC = 2MHz OSC = 2MHz L = 2.2µH 50 L = 2.2µH 50 L = 2.2µH 40 VIN = 2.25V 40 VIN = 2.7V 40 VIN = 2.25V EFFICIENCY (%) VIN = 3.3V EFFICIENCY (%) VIN = 3.3V EFFICIENCY (%) VIN = 3.3V 30 VIN = 5.5V 30 VIN = 5.5V 30 VIN = 5.5V VIN = 2.25V 20 VIN = 2.7V VIN = 2.25V V 20 20 IN = 3.3V VIN = 3.3V VIN = 3.3V 10 VIN = 5.5V 10 VIN = 5.5V 10 VIN = 5.5V FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE FORCED CONTINUOUS MODE 0 0 0 1 10 100 1000 1 10 100 1000 1 10 100 1000 LOAD CURRENT(mA) LOAD CURRENT(mA) LOAD CURRENT(mA) 3375 G25 3375 G26 3375 G27 3375fd For more information www.linear.com/3375 9 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