Datasheet LTC3126 (Analog Devices) - 6

LTC3126
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Efficiency vs Switching Frequency No-Load Input Current Shutdown Current vs VIN
96 8 2.0 VIN = 12V VOUT = 3.3V ENA = LOW VIN = 24V 7 PWM/SYNC = LOW 94 EXTVCC = VOUT 1.6 6 92 5 1.2 90 4 0.8 EFFICIENCY (%) 3 88 INPUT CURRENT (µA) INPUT CURRENT (µA) 2 0.4 86 VOUT = 5V LOAD = 1A 1 L = 10µH 84 0 0 200 600 1000 1400 1800 2200 0 5 10 15 20 25 30 35 40 45 0 5 10 15 20 25 30 35 40 45 SWITCHING FREQUENCY (kHz) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3126 G10 3126 G11 3126 G12
EXTVCC Current vs Switching Frequency EXTVCC Current vs Input Voltage Load Regulation
18 20 1.0 VIN = 12V 16 fSW = 700kHz 0.8 VIN = 24V fSW = 2MHz 16 0.6 14 0.4 12 (%) 12 0.2 OUT 10 0.0 8 CURRENT (mA) CURRENT (mA) 8 –0.2 V CC 6 V CC CHANGE IN V –0.4 EXT EXT 4 LOAD = 1A 4 –0.6 VOUT = 5V 2 EXTV LOAD = 1A CC = VOUT –0.8 L = 10µH VOUT = 5V 0 0 –1.0 200 600 1000 1400 1800 2200 5 15 25 35 45 0.0 0.5 1.0 1.5 2.0 2.5 SWITCHING FREQUENCY (kHz) INPUT VOLTAGE (V) LOAD CURRENT (A) 3126 G13 3126 G14 3126 G15
VCC LDO Voltage Drop vs Line Regulation FB Voltage vs Temperature Switching Frequency
0.5 0.5 100 VIN = 2.4V 0.4 0.4 90 PWM/SYNC = HIGH 0.3 0.3 80 = 24V (%) 0.2 0.2 70 IN 0.1 0.1 60 BUCK OPERATING (mV) –0.0 FROM 25°C (%) IN REGULATION FROM V –0.0 CC 50 FB – V OUT –0.1 –0.1 40 V IN –0.2 –0.2 30 BUCK OPERATING IN DROPOUT –0.3 VOUT = 3.3V –0.3 CHANGE IN V 20 LOAD = 0.5A CHANGE IN V –0.4 PWM/SYNC = HIGH –0.4 10 –0.5 –0.5 0 0 5 10 15 20 25 30 35 40 45 –50 –25 0 25 50 75 100 125 150 200 600 1000 1400 1800 2200 INPUT VOLTAGE (V) TEMPERATURE (°C) SWITCHING FREQUENCY (kHz) 3126 G16 3126 G17 3126 G18 3126f 6 For more information www.linear.com/LTC3126 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Quick Reference Operation Applications Information Typical Applications Package Description Typical Application Related Parts