RP505K101A-TR

RP505K Series 1A Step-down DC/DC Converters with Synchronous Rectifier NO.EA-273-150317 OUTLINE The RP505K Series are low supply current CMOS-based 1A*1 step-down DC/DC Converters with synchronous rectifier. Each of these ICs consists of an oscillator, a reference voltage unit, an error amplifier, a switching control circuit, a mode control circuit, a soft-start circuit, a latch type protection circuit, an under voltage lock out (UVLO) circuit, a thermal shutdown circuit, and a switching transistors. A low ripple, high efficiency synchronous rectifier step-down DC/DC converter can be easily composed of this IC with only an inductor and capacitors. Since the package is DFN(PLP)2020-8, high density mounting on boards is possible. In the RP505K series, as for the A version and B version, since feedback resistors are built-in, the voltage is fixed internally. 0.1V step output can be set by laser-trim and ±1.5%(VOUT≥1.2V) or 18mV(VOUT300mA 0.85 0.80 500 250 0 0.75 Output Voltage 0.70 0.65 -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) Output Voltage VOUT (V) Output Current 300mA-->800mA Output Current IOUT (mA) Output Voltage VOUT (V) 750 24 Output Current IOUT (mA) -10 0 200 750 500 0.90 250 0.85 0 0.80 Output Voltage 0.75 0.70 -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) Output Current IOUT (mA) 0.75 400 Output Current 300mA-->1mA Output Voltage VOUT (V) Output Current 1mA-->300mA Output Current IOUT (mA) Output Voltage VOUT (V) 400 Output Current IOUT (mA) MODE=“L”PWM/VFM automatic shift RP505K RP505K181A/B (VIN=3.6V) RP505K181A/B (VIN=3.6V) MODE=“L”PWM/VFM automatic shift MODE=“L”PWM/VFM automatic shift 1.85 1.80 Output Voltage 1.65 -10 0 1.90 1.85 1.80 Output Voltage 1.75 1.70 10 20 30 40 50 60 70 80 90 -100 0 100 200 300 400 500 600 700 800 900 Time t (µs) Time t (µs) RP505K181A/B (VIN=3.6V) RP505K181A/B (VIN=3.6V) MODE=“H” forced PWM MODE=“H” forced PWM 400 200 0 1.85 1.80 1.75 Output Voltage 1.70 1.65 -10 0 10 20 30 40 50 60 70 80 90 Output Voltage VOUT (V) Output Current 1mA-->300mA Output Current 300mA-->1mA Output Current IOUT (mA) Output Voltage VOUT (V) 400 200 0 1.90 1.85 1.80 Output Voltage 1.75 1.70 -10 Time t (µs) 0 10 20 30 40 50 60 70 80 90 Time t (µs) RP505K181A/B (VIN=3.6V) RP505K181A/B (VIN=3.6V) 500 1.85 250 1.80 0 1.75 Output Voltage 1.70 1.65 1000 Output Voltage VOUT (V) 750 Output Current IOUT (mA) Output Voltage VOUT (V) 1000 Output Current 300mA-->800mA Output Current IOUT (mA) 1.70 0 Output Current 800mA-->300mA 750 Output Current IOUT (mA) 1.75 200 Output Current IOUT (mA) 200 0 400 Output Current 300mA-->1mA Output Voltage VOUT (V) Output Current 1mA-->300mA Output Current IOUT (mA) Output Voltage VOUT (V) 400 500 1.90 250 1.85 0 1.80 Output Voltage 1.75 1.70 -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) 25 RP505K RP505K331A/B (VIN=5.0V) MODE=“L”PWM/VFM automatic shift 200 0 3.35 3.30 Output Voltage 3.20 0 3.40 3.35 3.30 Output Voltage 3.25 3.20 3.15 -10 0 -100 10 20 30 40 50 60 70 80 90 Time t (µs) 0 RP505K331A/B (VIN=5.0V) 3.30 Output Voltage 3.20 400 Output Current 300mA-->1mA Output Voltage VOUT (V) 0 Output Current IOUT (mA) Output Voltage VOUT (V) 200 3.35 3.25 Time t (µs) MODE=“H” forced PWM 400 Output Current 1mA-->300mA 100 200 300 400 500 600 700 800 900 RP505K331A/B (VIN=5.0V) MODE=“H” forced PWM 200 0 3.40 3.35 3.30 Output Voltage 3.25 3.20 3.15 -10 10 20 30 40 50 60 70 80 90 Time t (µs) 0 10 20 30 40 50 60 70 80 90 Time t (µs) RP505K331A/B (VIN=5.0V) RP505K331A/B (VIN=5.0V) 1000 750 500 3.35 250 3.30 0 3.25 Output Voltage 3.20 3.15 -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) Output Voltage VOUT (V) Output Current 300mA-->800mA Output Current IOUT (mA) Output Voltage VOUT (V) 1000 Output Current 800mA-->300mA 750 500 3.40 250 3.35 0 3.30 Output Voltage 3.25 3.20 -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) Output Current IOUT (mA) -10 0 26 200 Output Current IOUT (mA) 3.25 400 Output Current 300mA-->1mA Output Voltage VOUT (V) Output Current 1mA-->300mA Output Current IOUT (mA) Output Voltage VOUT (V) 400 Output Current IOUT (mA) RP505K331A/B (VIN=5.0V) MODE=“L”PWM/VFM automatic shift RP505K RP505K001C (VIN=3.6V, VOUT=0.8V) RP505K001C (VIN=3.6V, VOUT=0.8V) MODE=“L”PWM/VFM モード自動切替え MODE=“L”PWM/VFM automatic shift 0.85 0.80 Output Voltage 0.70 0.90 0.85 0.80 Output Voltage 0.75 0.65 -10 0 0 0.70 -100 10 20 30 40 50 60 70 80 90 Time t (µs) RP505K001C (VIN=3.6V, VOUT=0.8V) 0 MODE=“H” forced PWM 0 0.85 0.80 Output Voltage 0.70 0.65 Output Current 300mA-->1mA Output Voltage VOUT (V) 200 Output Current IOUT (mA) 400 200 0 0.90 0.85 0.80 Output Voltage 0.75 0.70 -10 0 10 20 30 40 50 60 70 80 90 -10 Time t (µs) 0 10 20 30 40 50 60 70 80 90 Time t (µs) RP505K001C (VIN=3.6V, VOUT=0.8V) RP505K001C (VIN=3.6V, VOUT=0.8V) Output Current 300mA-->800mA 0.85 500 250 0 0.80 0.75 Output Voltage 0.70 1000 Output Voltage VOUT (V) 750 Output Current IOUT (mA) Output Voltage VOUT (V) 1000 Output Current 800mA-->300mA 750 500 0.90 250 0.85 0 0.80 Output Voltage 0.75 Output Current IOUT (mA) Output Voltage VOUT (V) 400 0.75 Time t (µs) RP505K001C (VIN=3.6V, VOUT=0.8V) MODE=“H” forced PWM Output Current 1mA-->300mA 100 200 300 400 500 600 700 800 900 Output Current IOUT (mA) 0.75 200 Output Current IOUT (mA) 0 Output Current 300mA-->1mA Output Voltage VOUT (V) 200 Output Current 1mA-->300mA 400 Output Current IOUT (mA) Output Voltage VOUT (V) 400 0.70 0.65 -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) 27 RP505K RP505K001C (VIN=3.6V, VOUT=1.2V) RP505K001C (VIN=3.6V, VOUT=1.2V) MODE=“L”PWM/VFM automatic shift MODE=“L”PWM/VFM automatic shift 400 1.25 1.20 Output Voltage 1.10 1.30 1.25 1.20 0 Output Voltage 1.15 1.05 -10 0 1.10 -100 10 20 30 40 50 60 70 80 90 Time t (µs) 0 100 200 300 400 500 600 700 800 900 Time t (µs) RP505K001C (VIN=3.6V, VOUT=1.2V) RP505K001C (VIN=3.6V, VOUT=1.2V) MODE=“H” forced PWM MODE=“H” forced PWM 200 0 1.25 1.20 1.15 Output Voltage 1.10 Output Voltage VOUT (V) Output Current 1mA-->300mA 400 Output Current IOUT (mA) 1.05 Output Current 300mA-->1mA 0 1.30 1.25 1.20 Output Voltage 1.15 1.10 -10 0 10 20 30 40 50 60 70 80 90 -10 0 Time t (µs) 10 20 30 40 50 60 70 80 90 Time t (µs) RP505K001C (VIN=3.6V, VOUT=1.2V) RP505K001C (VIN=3.6V, VOUT=1.2V) 1000 Output Current 300mA-->800mA 1.25 500 250 0 1.20 1.15 Output Voltage 1.10 1.05 Output Voltage VOUT (V) 750 Output Current IOUT (mA) Output Voltage VOUT (V) 1000 Output Current 800mA-->300mA 10 20 30 40 50 60 70 80 90 Time t (µs) 750 500 1.30 250 1.25 0 1.20 Output Voltage 1.15 1.10 -10 0 28 200 -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) Output Current IOUT (mA) Output Voltage VOUT (V) 400 Output Current IOUT (mA) 1.15 200 Output Current IOUT (mA) 0 Output Current 300mA-->1mA Output Voltage VOUT (V) 200 Output Current 1mA-->300mA Output Current IOUT (mA) Output Voltage VOUT (V) 400 RP505K RP505K001C (VIN=3.6V, VOUT=1.8V) RP505K001C (VIN=3.6V, VOUT=1.8V) MODE=“L”PWM/VFM automatic shift 200 0 1.85 1.80 Output Voltage 1.65 -10 0 0 1.90 1.85 1.80 Output Voltage 1.75 1.70 10 20 30 40 50 60 70 80 90 -10 0 Time t (µs) RP505K001C (VIN=3.6V, VOUT=1.8V) 0 RP505K001C (VIN=3.6V, VOUT=1.8V) MODE=“H” forced PWM 0 1.85 1.80 Output Voltage 1.70 Output Voltage VOUT (V) 200 Output Current IOUT (mA) Output Voltage VOUT (V) 400 1.75 1.65 -10 0 100 200 300 400 500 600 700 800 900 Time t (µs) MODE=“H” forced PWM Output Current 1mA-->300mA 1.90 1.85 1.80 Output Voltage 1.75 RP505K001C (VIN=3.6V, VOUT=1.8V) 0 10 20 30 40 50 60 70 80 90 Time t (µs) RP505K001C (VIN=3.6V, VOUT=1.8V) 1000 500 250 0 1.75 Output Voltage 1.70 1.65 Output Voltage VOUT (V) 750 Output Current IOUT (mA) Output Voltage VOUT (V) 1000 1.80 200 0 -10 Time t (µs) 1.85 400 Output Current 300mA-->1mA 1.70 10 20 30 40 50 60 70 80 90 Output Current 300mA-->800mA 200 Output Current IOUT (mA) 1.70 400 Output Current 300mA-->1mA Output Current 800mA-->300mA 750 500 1.90 250 1.85 0 1.80 Output Voltage 1.75 Output Current IOUT (mA) 1.75 Output Voltage VOUT (V) Output Current 1mA-->300mA Output Current IOUT (mA) Output Voltage VOUT (V) 400 Output Current IOUT (mA) MODE=“L”PWM/VFM automatic shift 1.70 -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) -10 0 10 20 30 40 50 60 70 80 90 Time t (us) 29 RP505K RP505K001C (VIN=5.0V, VOUT=3.3V) RP505K001C (VIN=5.0V, VOUT=3.3V) MODE=“L”PWM/VFM automatic shift 200 0 3.35 3.30 Output Voltage 3.20 3.15 -10 0 0 3.40 3.35 3.30 Output Voltage 3.25 3.20 10 20 30 40 50 60 70 80 90 -100 0 100 200 300 400 500 600 700 800 900 Time t (µs) Time t (µs) RP505K001C (VIN=5.0V, VOUT=3.3V) RP505K001C (VIN=5.0V, VOUT=3.3V) MODE=“H” forced PWM MODE=“H” forced PWM 0 3.35 3.30 Output Voltage 3.20 3.15 0 3.40 3.35 3.30 Output Voltage 3.25 10 20 30 40 50 60 70 80 90 -10 Time t (µs) RP505K001C (VIN=5.0V, VOUT=3.3V) 0 10 20 30 40 50 60 70 80 90 Time t (µs) RP505K001C (VIN=5.0V, VOUT=3.3V) 500 3.35 250 3.30 0 3.25 Output Voltage 3.20 3.15 -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) Output Voltage VOUT (V) Output Current 300mA-->800mA Output Current IOUT (mA) 750 Output Current 800mA-->300mA 750 500 3.40 250 3.35 0 3.30 Output Voltage 3.25 3.20 -10 0 10 20 30 40 50 60 70 80 90 Time t (µs) Output Current IOUT (mA) 1000 1000 Output Voltage VOUT (V) 200 3.20 -10 0 30 400 Output Current 300mA-->1mA Output Voltage VOUT (V) 200 Output Current 1mA-->300mA Output Current IOUT (mA) Output Voltage VOUT (V) 400 3.25 200 Output Current IOUT (mA) 3.25 400 Output Current 300mA-->1mA Output Voltage VOUT (V) Output Current 1mA-->300mA Output Current IOUT (mA) Output Voltage VOUT (V) 400 Output Current IOUT (mA) MODE=“L”PWM/VFM automatic shift RP505K 18) Mode Switching Waveform RP505K181A/B (VIN=3.6V, IOUT=1mA) RP505K181A/B (VIN=3.6V, IOUT=1mA) MODE=“L” --> MODE=“H” MODE=“H" --> MODE=“L” 1.80 600 1.75 -200 800 0 Time t (µs) 200 400 600 800 Time t (µs) RP505K001C (VIN=3.6V, VOUT=1.2V, IOUT=1mA) RP505K001C (VIN=3.6V, VOUT=1.2V, IOUT=1mA) MODE=“L” --> MODE=“H” MODE=“H” --> MODE=“L” 5 1.30 Output Voltage 1.25 1.20 1.15 -200 0 200 400 600 Output Voltage VOUT (V) 0 (V) Mode Input Voltage Mode Input Voltage VMODE Output Voltage VOUT (V) 5 1.30 Output Voltage 1.25 1.20 1.15 -200 800 0 Time t (µs) 200 400 600 RP505K001C (VIN=3.6V, VOUT=1.8V, IOUT=1mA) MODE=“L” --> MODE=“H” MODE=“H” --> MODE=“L” 1.90 Output Voltage 1.80 0 200 400 Time t (µs) 600 800 Output Voltage VOUT (V) 0 (V) Mode Input Voltage 5 Mode Input Voltage VMODE Output Voltage VOUT (V) 5 1.75 -200 800 Time t (µs) RP505K001C (VIN=3.6V, VOUT=1.8V, IOUT=1mA) 1.85 0 Mode Input Voltage (V) 400 1.80 0 Mode Input Voltage 1.90 Output Voltage 1.85 1.80 1.75 -200 0 200 400 600 (V) 200 Output Voltage 1.85 Mode Input Voltage VMODE 0 Mode Input Voltage 1.90 Mode Input Voltage VMODE 1.75 -200 0 (V) Output Voltage 1.85 Output Voltage VOUT (V) 1.90 (V) 0 Mode Input Voltage VMODE Output Voltage VOUT (V) Mode Input Voltage Mode Input Voltage VMODE 5 5 800 Time t (µs) 31 1. 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