Datasheet LTC3121 (Analog Devices) - 4

LTC3121
Typical perForMance characTerisTics Configured as front page application unless otherwise specified. Efficiency vs Load Current, Efficiency vs Load Current, Efficiency vs Load Current, VOUT = 5V VOUT = 7.5V VOUT = 12V
100 100 100 90 90 90 BURST BURST BURST 80 80 80 70 70 70 60 60 60 50 50 50 PWM PWM PWM 40 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 30 30 20 20 20 VIN = 4.2V V VIN = 5.4V IN = 5.4V 10 VIN = 3.3V 10 VIN = 3.8V 10 VIN = 4.2V V V V IN = 0.6V IN = 2.6V IN = 2.3V 0 0 0 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 3121 G01 3121 G03 3121 G02
PWM Mode Operation Load Transient Response Inrush Current Control
VOUT VOUT SD 20mV/DIV 500mV/DIV 5V/DIV AC-COUPLED AC-COUPLED 400mA VOUT INDUCTOR 5V/DIV CURRENT OUTPUT 1A/DIV CURRENT INDUCTOR 250mA/DIV CURRENT ILOAD = 200mA 40mA 40mA 1A/DIV 1µs/DIV 3121 G04 500µs/DIV 3121 G05 2ms/DIV 3121 G06
RDS(ON) vs Temperature, Oscillator Frequency Feedback vs Temperature Both NMOS and PMOS vs Temperature
0.2 80 1.0 0.1 60 0.5 0 40 0 –0.1 FROM 25°C (%) FROM 25°C (%) –0.2 20 –0.5 FB DS(ON) –0.3 0 –1.0 –0.4 CHANGE IN V –20 –1.5 –0.5 CHANGE IN R CHANGE IN FREQUENCY FROM 25°C (%) –0.6 –40 –2.0 –60 –10 40 90 140 –50 –10 30 70 110 150 –60 –10 40 90 140 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3121 G07 3121 G08 3121 G09 3121fa 4 For more information www.linear.com/LTC3121 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