Datasheet LTC3375 (Analog Devices) - 7

LTC3375
Typical perForMance characTerisTics VCC Undervoltage Threshold Buck VIN Undervoltage Threshold VCC Supply Current vs Temperature vs Temperature vs Temperature
2.70 2.30 60 ALL REGULATORS 55 2.65 2.25 IN SHUTDOWN 50 2.60 2.20 45 VCC RISING VIN RISING 40 2.55 2.15 (µA) 35 2.50 2.10 30 VCC FALLING VIN FALLING 25 2.45 2.05 I VCC_ALLOFF UV THRESHOLD (V) UV THRESHOLD (V) 20 VCC = 5.5V 2.40 2.00 15 VCC = 3.3V 10 2.35 1.95 V 5 CC = 2.7V 2.30 1.90 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3375 G01 3375 G02 3375 G03
VCC Supply Current VCC Supply Current RT Programmed Oscillator vs Temperature vs Temperature Frequency vs Temperature
125 400 2.20 AT LEAST ONE BUCK ENABLED AT LEAST ONE BUCK ENABLED RRT = 400k SYNC = 0V 360 SYNC = 2MHz 2.15 FB = 850mV 100 320 2.10 280 VCC = 5.5V 2.05 75 VCC = 5.5V 240 V (µA) (µA) CC = 3.3V 200 (MHz) V 2.00 CC = 3.3V I VCC I VCC V f OSC 50 160 CC = 2.7V 1.95 VCC = 2.7V 120 1.90 25 80 VCC = 5.5V 1.85 VCC = 3.3V 40 VCC = 2.7V 0 0 1.80 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3375 G04 3375 G05 3375 G06
Default Oscillator Frequency vs Temperature Oscillator Frequency vs VCC Oscillator Frequency vs RT
2.20 2.20 4.0 VRT = VCC VCC = 3.3V 2.15 2.15 3.5 2.10 2.10 3.0 2.05 2.05 VRT = VCC 2.5 (MHz) 2.00 (MHz) 2.00 (MHz) R 2.0 RT = 400k f OSC f OSC f OSC 1.95 1.95 1.5 1.90 1.90 1.0 VCC = 5.5V 1.85 VCC = 3.3V 1.85 0.5 VCC = 2.7V 1.80 1.80 0 –50 –25 0 25 50 75 100 125 150 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 250 300 350 400 450 500 550 600 650 700 750 800 TEMPERATURE (°C) VCC (V) RRT (kΩ) 3375 G07 3375 G08 3375 G09 3375fd For more information www.linear.com/3375 7 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