Datasheet LTC3621, LTC3621-2 (Analog Devices) - 5

LTC3621/LTC3621-2
Typical perForMance characTerisTics TJ = 25°C, unless otherwise noted. Efficiency vs Load Current VIN Supply Current Efficiency vs Load at Dropout (Burst Mode Operation) vs Input Voltage Operation
100 5 100 90 90 80 4 80 Burst Mode 70 70 OPERATION 60 3 60 SLEEP 50 50 FORCED CONTINUOUS 40 2 40 MODE EFFICIENCY (%) EFFICIENCY (%) 30 SUPPLY CURRENT (µA) 30 V IN 20 1 V 20 OUT = 2.5V 10 VIN = 12V VOUT = 3.3V 10 VIN = 5V FREQUENCY = 2.25MHz VOUT = 5V SD FREQUENCY = 2.25MHz 0 0 0 0.001 0.01 0.1 1 0 2 4 6 8 10 12 14 16 18 20 0.0001 0.001 0.01 0.1 1 LOAD CURRENT (A) INPUT VOLTAGE (V) LOAD CURRENT (A) 3621 G01 3621 G03 3621 G02
Burst Mode Operation Pulse-Skipping Mode Operation Load Step
SW SW VOUT 5V/DIV 5V/DIV 100mV/DIV VOUT VOUT IL AC-COUPLED AC-COUPLED 500mA/DIV 50mV/DIV 50mV/DIV IL IL ILOAD 500mA/DIV 500mA/DIV 500mA/DIV 3621 G04 3621 G05 3621 G06 4µs/DIV V 4µs/DIV 40µs/DIV IN = 12V VIN = 12V VIN = 12V VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V Burst Mode OPERATION PULSE SKIP MODE ILOAD = 0.05A IOUT = 50mA IOUT = 10mA L = 2.2µH L = 2.2µH
Oscillator Frequency Soft-Start Operation Efficiency vs Input Voltage vs Temperature
96 2.50 RUN VOUT = 2.5V 5V/DIV 94 2.45 92 2.40 I 90 L ILOAD = 1A 0.5A/DIV 88 2.35 86 2.30 84 VOUT 2.25 1V/DIV 82 I 2.20 80 LOAD = 10mA PGOOD EFFICIENCY (%) 78 2.15 2V/DIV 76 2.10 3621 G07 OSCILLATOR FREQUENCY (MHz) 400µs/DIV 74 2.05 72 70 2.00 0 5 10 15 20 –50 –25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) TEMPERATURE (°C) 3621 G08 3621 G09 3621fc For more information www.linear.com/LTC3621 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 Applications Information Package Description Revision History Typical Application Related Parts