RP503N251A-TR-FE

＊RP503Z (WLCSP-6-P2) is the discontinued product. As of June in 2016. RP503x SERIES 600mA∗ Step-down DC/DC Converter with Synchronous Rectifier NO.EA-235-140530 OUTLINE ∗ The RP503x Series are low supply current CMOS-based 600mA step-down DC/DC Converters with synchronous rectifier. Each of these ICs consists of an oscillator, a switching control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, UVLO circuit, a latch protection circuit, switching transistors, and so on. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC with only an inductor and capacitors. In terms of the output voltage, since the feedback resistances are built-in, the voltage is fixed internally. 0.1V step output can be set by laser-trim and 1.5% or 18mV tolerance depending on the output voltage is guaranteed. RP503x is PWM/VFM auto switching control in which mode automatically switches from PWM mode to high-efficiency VFM mode in low output current. The efficiency in low output current (VFM mode) improved compared with existing products. As protection circuits, the current limit circuit which limits peak current of Lx at each clock cycle, and the latch type protection circuit which works if the term of the over-current condition keeps on a certain time exist. The latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of the protection, after disabling this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make the supply voltage at UVLO detector threshold level or lower than UVLO. Since packages are WLCSP-6-P2, DFN1616-6, SOT-23-5, high density mounting on boards is possible. ∗)This is an approximate value, because output current depends on conditions and external parts. FEATURES • • • • • • • • • • • • • • • Supply Current ......................................................Typ. 20μA (at VFM mode, at no load) Standby Current ....................................................Max. 5μA Input Voltage Range .............................................2.5V to 5.5V (Absolute maximum rating; 6.5V) Output Voltage Range...........................................0.8V to 2.5V (0.1V step) Output Voltage Accuracy.......................................±1.5% (VOUT≥1.2V), ±18mV (VOUT0). In the case of PWM control system, the output voltage is maintained by controlling the on-time period (ton), with the oscillator frequency (fosc) being maintained constant. The maximum value (ILmax) and the minimum value (ILmin) of the current flowing through the inductor are the same as those when Pch Tr. turns on and off. The difference between ILmax and ILmin, which is represented by ΔI: ∆I = ILmax − ILmin = VOUT × topen / L = (VIN − VOUT) × ton / L ..........................................Equation 1 wherein, T = 1 / fosc = ton + toff duty (%) = ton / T × 100 = ton × fosc × 100 topen ≤ toff In Equation 1, VOUT × topen / L and (VIN − VOUT) × ton / L respectively show the change of the current at "ON", and the change of the current at "OFF". 12 ＊RP503Z (WLCSP-6-P2) is the discontinued product. As of June in 2016. RP503x Discontinuous mode and Continuous mode When the output current (IOUT) is relatively small, topen < toff as illustrated in the above diagram. In this case, the energy is charged in the inductor during the time period of ton and is discharged in its entirely during the time period of toff, therefore ILmin becomes to zero (ILmin=0). When IOUT is gradually increased, eventually, topen becomes to toff (topen=toff), and when IOUT is further increased, ILmin becomes larger than zero (ILmin>0). The former mode is referred to as the discontinuous mode and the latter mode is referred to as continuous mode. Discontinuous mode Continuous mode ILmax IL IL ILmax ILmin ILmin topen t ton toff T=1/fosc Iconst t ton toff T=1/fosc In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc, tonc = T × VOUT / VIN ....................................................................................................... Equation 2 T When ton1mA 0 0.90 0.85 0.80 Output Voltage 0.75 0.70 0 20 40 60 Time t (µs) 80 100 0 200 RP503x08xA 400 600 Time t (µs) 800 1000 RP503x08xA 600 Output Current 200mA-->500mA 200 0 0.85 0.80 Output Voltage 0.75 0.70 Output Current 500mA-->200mA 400 200 0 0.90 0.85 Output Voltage 0.80 0.75 0.70 0.65 0 26 Output Current IOUT (mA) Output Voltage V OUT (V) 400 Output Voltage V OUT (V) 600 20 40 60 Time t (µs) 80 100 0 20 40 60 Time t (µs) 80 100 Output Current O I UT (mA) Output Voltage V OUT (V) 200 Output Current 1mA-->300mA Output Current O I UT (mA) 400 Output Voltage V OUT (V) 400 ＊RP503Z (WLCSP-6-P2) is the discontinued product. As of June in 2016. RP503x RP503x12xA RP503x12xA 400 0 1.25 1.20 Output Voltage 1.15 1.10 0 1.30 1.25 1.20 Output Voltage 1.15 1.10 20 40 60 80 100 0 200 Time t (µs) RP503x12xA 400 600 Time t (µs) 800 RP503x12xA 600 600 200 0 1.25 1.20 Output Voltage 1.10 Output Voltage V OUT (V) Output Current IOUT (mA) 1.05 Output Current 500mA-->200mA 400 200 1.30 0 1.25 1.20 Output Voltage 1.15 1.10 1.05 0 20 40 60 80 100 0 20 Time t (µs) RP503x18xA 40 60 Time t (µs) 80 RP503x18xA 400 200 0 1.85 1.80 Output Voltage 1.70 Output Current O I UT (mA) Output Current 1mA-->300mA Output Voltage V OUT (V) 400 1.75 100 Output Current 300mA-->1mA 200 0 1.90 1.85 1.80 Output Voltage 1.75 1.70 Output Current IOUT (mA) Output Voltage V OUT (V) 400 Output Current 200mA-->500mA 1.15 1000 Output Current O I UT (mA) 0 Output Voltage V OUT (V) 200 Output Current 300mA-->1mA Output Current IOUT (mA) Output Current 1mA-->300mA Output Voltage V OUT (V) 200 Output Current O I UT (mA) Output Voltage V OUT (V) 400 1.65 1.65 0 20 40 60 Time t (µs) 80 100 0 200 400 600 Time t (µs) 800 1000 27 ＊RP503Z (WLCSP-6-P2) is the discontinued product. As of June in 2016. RP503x RP503x18xA RP503x18xA 600 0 1.85 1.80 Output Voltage 1.75 1.70 400 Output Current 500mA-->200mA 200 1.90 0 1.85 1.80 Output Voltage 1.75 1.70 1.65 1.65 20 40 60 Time t (µs) 80 0 100 20 40 60 Time t (µs) RP503x25xA 80 100 RP503x25xA 0 2.55 2.50 Output Voltage 2.45 2.40 2.35 400 Output Voltage V OUT (V) 200 Output Current 1mA-->300mA Output Current IOUT (mA) 200 Output Current 300mA-->1mA 0 2.65 2.60 2.55 2.50 Output Voltage 2.45 2.40 0 20 40 60 Time t (µs) 80 100 0 200 RP503x25xA 400 600 Time t (µs) 800 1000 RP503x25xA 600 600 0 2.55 2.50 Output Voltage 2.45 2.40 2.35 Output Voltage V OUT (V) 200 Output Current IOUT (mA) Output Voltage V OUT (V) 400 Output Current 200mA-->500mA Output Current 500mA-->200mA 400 200 2.65 0 2.60 2.55 2.50 Output Voltage 2.45 2.40 0 20 40 60 Time t (µs) 80 100 0 20 40 60 Time t (µs) 80 100 Output Current IOUT (mA) Output Voltage V OUT (V) 400 Output Current IOUT (mA) 0 28 Output Current IOUT (mA) 200 Output Voltage V OUT (V) 400 Output Current 200mA-->500mA Output Current IOUT (mA) Output Voltage V OUT (V) 600 1. 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