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MAX1557ETB+ Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX1557ETB+ Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 12 page 16µA IQ, 1.2A PWM DC-DC Step-Down Converters _______________________________________________________________________________________ 5 LIGHT-LOAD SWITCHING WAVEFORMS MAX1556/7 toc10 20mV/div AC-COUPLED VLX VOUT ILX 2V/div 0 4 µs/div 0 200mA/div EXTERNAL FEEDBACK SWITCHING WAVEFORMS MAX1556/7 toc10b VLX ILX 2V/div 0 2 µs/div 0 200mA/div VIN = 5V, VOUT = 3.3V, IOUT = 500mA SOFT-START/SHUTDOWN WAVEFORMS MAX1556/7 toc11 5V/div ILX VSHDN VOUT IIN 500mA/div 0 0 100 µs/div 0 1V/div 0 500mA/div CSS = 470pF RLOAD = 4 Ω SOFT-START RAMP TIME vs. CSS CSS (pF) 500 1000 1500 2000 10 0.1 0 2500 1 LOAD TRANSIENT MAX1556/7 toc13 50mV/div AC-COUPLED 500mA/div VOUT IOUT 20 µs/div 0 IOUTMIN = 20mA LOAD TRANSIENT MAX1556/7 toc14 50mV/div AC-COUPLED 500mA/div VOUT IOUT 20 µs/div 0 IOUTMIN = 180mA LINE TRANSIENT MAX1556/7 toc15 10mV/div AC-COUPLED VIN VOUT ILX 3.5V 4V 40 µs/div 0 200mA/div BODE PLOT MAX1556/7 toc16 FREQUENCY (kHz) 100 10 1 -50 -40 -30 -20 -10 0 10 20 30 40 -60 -30 0 30 60 90 120 150 180 210 240 -60 0.1 1000 0dB PHASE MARGIN = 53 ° COUT = 22 µF, RLOAD = 4Ω Typical Operating Characteristics (continued) (VIN = VINP = 3.6V, D1 = D2 = SHDN = IN, Circuits of Figures 2 and 3, TA = +25°C, unless otherwise noted.) |
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