Datasheet LTC3121 (Analog Devices) - 5

LTC3121
Typical perForMance characTerisTics PWM Mode Maximum Output Peak Current Limit Change PWM Operation No Load Input Current vs VIN vs Temperature Current vs VIN
1.4 2 70 VOUT = 5V VOUT = 5V 1.2 VOUT = 7.5V VOUT = 7.5V V 1 60 OUT = 12V VOUT = 12V 1.0 50 0 0.8 40 –1 0.6 30 –2 OUTPUT CURRENT (A) 0.4 INPUT CURRENT (mA) 20 0.2 –3 10 0 PEAK CURRENT LIMIT CHANGE FROM 25°C (%) –4 0 0.5 1.5 2.5 3.5 4.5 5.5 –50 –10 30 70 110 150 0 1 2 3 4 5 6 VIN (V) TEMPERATURE (°C) VIN (V) 3121 G10 3121 G11 3121 G12
Burst Mode Maximum Output Burst Mode No Load Input Current Burst Mode Quiescent Current Current vs VIN vs VIN Change vs Temperature
350 10000 75 VOUT = 2.2V VOUT = 5V V V 300 OUT = 5V OUT = 7.5V VOUT = 7.5V VOUT = 12V 60 VOUT = 12V 250 1000 45 200 30 150 100 15 OUTPUT CURRENT (mA) 100 INPUT CURRENT (µA) 50 0 CHANGE IN CURRENT FROM 25°C (%) 0 10 –15 0.5 1.5 2.5 3.5 4.5 5.5 0.5 1.5 2.5 3.5 4.5 5.5 –50 –10 30 70 110 150 VIN, FALLING (V) VIN, FALLING (V) TEMPERATURE (°C) 3121 G13 3121 G14 3121 G15
SD Pin Threshold Frequency vs RT Frequency Accuracy
3.0 12 4 FREQUENCY VOUT = 15V PERIOD 3 VOUT = 3.6V 2.5 10 VOUT = 2.2V VOUT 2 5V/DIV 2.0 8 PERIOD (µs) 1 1.5 6 0 900mV 400mV –1 VSD FREQUENCY (MHz) 1.0 4 500mV/DIV –2 CHANGE IN FREQUENCY (%) 0.5 2 1s/DIV 3121 G16 –3 0 0 –4 0 100 200 300 400 500 600 0 1 2 3 4 5 6 RT (kΩ) VIN FALLING (V) 3121 G17 3121 G18 3121fa For more information www.linear.com/LTC3121 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description 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 Low Voltage Operation Low Noise Fixed Frequency Operation Burst Mode Operation Applications Information PCB Layout Guidelines Schottky Diode Component Selection Operating Frequency Selection Typical Applications Package Description Revision History Typical Application Related Parts