RP502x SERIES Step-down DC/DC Converter with Synchronous Rectifier NO.EA-189-110315 OUTLINE The RP502x Series are CMOS-based 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 soft-start circuit, protection circuits, an UVLO circuit, and switching transistors. By adopting the synchronous rectification with built-in switching transistors, high efficient step-down DC/DC converter can be composed of only an inductor and capacitors. As protection circuits, the current limit circuit and the latch protection circuit are built into the ICs. The current limit circuit controls the peak current of LX at each clock cycle. Latch protection circuit maintains the built-in driver in OFF state if the load current exceeds the limit value for a certain period of time. To cancel the latch protection, disable the ICs with a chip enable circuit and then enable it again or make the power supply voltage lower than UVLO. The setting voltage for the RP502x Series is the output voltage fixed type with built-in feedback resistance that is adjustable in 0.1V step with the accuracy of 1.5% or 24mV. The packages for the ICs are WLCSP-6-P2 and DFN1616-6, which enable the high-density mounting. The switching mode for the ICs is selectable from the PWM/VFM auto switching type, which achieves the high efficiency at the light load condition or PWM fixed type, which switches at the fixed frequency. FEATURES * Supply Current ......................................................Typ. 750A (at normal) Typ. 180A (at light road) * Input Voltage Range .............................................2.5V to 5.5V(VOUT1.0V) 2.5V to 4.5V(VOUT<1.0V) * Absolute Maximum Ratings ..................................6.0V * Output Voltage Range...........................................0.8V to 3.3V (0.1V steps) * Output Voltage Accuracy.......................................1.5% (VOUT1.6V) 24mV (VOUT<1.6V) * Oscillator Frequency .............................................Typ. 3.3MHz * Maximum Duty ......................................................Min. 100% * Built-in Driver ON Resistance ...............................Typ. Pch. 0.5, Nch. 0.5(VIN=3.6V) * UVLO Detector Threshold.....................................Typ. 2.2V * Soft Start Time.......................................................Typ. 0.12ms * Lx Current Limit.....................................................Typ. 900mA(VOUT1.2V) Typ. 800mA(VOUT<1.2V) * Latch type Protection Circuit .................................Typ. 1.5ms * Chip Enable Function............................................"H" Active * Packages ..............................................................WLCSP-6-P2, DFN1616-6 APPLICATIONS * Power source for battery-powered equipments. * Power source for hand-held communication equipments, cameras, VCRs, camcorders. * Power source for HDDs, portable equipments. 1 RP502x BLOCK DIAGRAMS RP502xxx1B VIN CE CHIP ENABLE RAMP COMPENSATION CURRENT FEEDBACK OSCILLATOR VREF CURRENT PROTECTION LX SWITCHING CONTROL PWM SOFT START UVLO VOUT AGND PGND RP502xxx2B VIN CE CHIP ENABLE RAMP COMPENSATION CURRENT FEEDBACK OSCILLATOR VREF SOFT START AGND PGND 2 PWM CURRENT PROTECTION LX SWITCHING CONTROL UVLO VOUT RP502x RP502xxx3B VIN CE CHIP ENABLE RAMP COMPENSATION CURRENT FEEDBACK OSCILLATOR VREF CURRENT PROTECTION SWITCHING CONTROL PWM SOFT START LX UVLO VOUT AGND PGND RP502xxx4B VIN CE CHIP ENABLE RAMP COMPENSATION CURRENT FEEDBACK OSCILLATOR VREF SOFT START PWM CURRENT PROTECTION LX SWITCHING CONTROL UVLO VOUT AGND PGND 3 RP502x SELECTION GUIDE In the RP502 Series, output voltage, switching mode, and auto discharge function for the ICs are selectable at the user's request. Product Name RP502ZxxB-E2-F RP502LxxB-TR Package Quantity per Reel Pb Free Halogen Free WLCSP-6-P2 5,000 pcs Yes Yes DFN1616-6 5,000 pcs Yes Yes 1 xx : The output voltage can be designated in the range of 0.8V(08) to 3.3V(33) in 0.1V steps . (For other voltages, please refer to MARK INFORMATIONS.) : The switching mode and auto discharge function can be designated as shown below. Code PWM/VFM auto switching Auto discharge function 1 Yes No 2 No No 3 Yes Yes 4 No Yes Auto-discharge function quickly lowers the output voltage to 0V, when the chip enable signal is switched from the active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor. 1) 0.05V step is also available as a custom code. 4 RP502x PIN CONFIGURATIONS * WLCSP-6-P2 Mark Side * DFN1616-6 Top View Bump Side 6 6 5 4 4 5 5 4 Bottom View 4 5 6 6 1 2 3 3 2 1 1 2 3 3 2 1 PIN DESCRIPTIONS * * WLCSP-6-P2 Pin No Symbol Pin Description 1 VOUT Output Pin 2 PGND Ground Pin 3 LX LX Switching Pin 4 VIN Input Pin 5 AGND 6 CE Ground Pin Chip Enable Pin ("H" Active) DFN1616-6 Pin No Symbol Pin Description 1 CE 2 AGND 3 VIN Input Pin 4 LX LX Switching Pin 5 PGND Ground Pin 6 VOUT Output Pin Chip Enable Pin ("H" Active) Ground Pin ) Tab is GND level. (They are connected to the reverse side of this IC.) The tab is better to be connected to the GND, but leaving it open is also acceptable. 5 RP502x ABSOLUTE MAXIMUM RATINGS Symbol AGND=PGND=0V Item Rating Unit VIN Input Voltage -0.3 to 6.0 V VLX LX pin Voltage -0.3 to VIN + 0.3 V VCE CE Pin Input Voltage -0.3 to 6.0 V VOUT Output Voltage -0.3 to 6.0 V 900 mA ILX PD Ta Tstg LX Pin Output Current Power Dissipation (WLCSP-6-P2) Power Dissipation (DFN1616-6) 650 640 mW Operating Temperature Range -40 to 85 C Storage Temperature Range -55 to 125 C ) For Power Dissipation, please refer to PACKAGE INFORMATION. ABSOLUTE MAXIMUM RATINGS Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the lifetime and safety for both device and system using the device in the field. The functional operation at or over these absolute maximum ratings is not assured. RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS) All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions. 6 RP502x ELECTRICAL CHARACTERISTICS * RP502xxxxB Symbol (Ta=25C) Item Conditions Operating Input Voltage VOUT 1.0 VOUT <1.0 Output Voltage VIN = VCE =3.6V or VSET +1V Output Voltage Temperature Coefficient -40C < = Ta < = 85C fosc Oscillator Frequency VIN = VCE =3.6V or VSET +1V IDD1 Supply Current 1 VIN = VCE =5.5V, VOUT =0V IDD2 Supply Current 2 VIN = VCE = VOUT =5.5V Istandby Standby Current VIN = 5.5V, VCE = 0V ICEH CE "H" Input Current VIN = VCE = 5.5V ICEL CE "L" Input Current VIN VOUT VOUT/Ta 1 VOUT 1.6 VOUT <1.6 MIN. TYP. 2.5 2.5 -1.5% -0.024 MAX. 5.5 4.5 +1.5% +0.024 V V ppm/ C 100 2.64 Unit 3.3 3.96 MHz 750 900 A 180 750 240 900 A 0 5 A -1 0 1 A VIN = 5.5V, VCE = 0V -1 0 1 A PWM/VFM PWM fixed IVOUTH VOUT "H" Input Current VIN = VOUT = 5.5V, VCE = 0V -1 0 1 A IVOUTL VOUT "L" Input Current VIN = 5.5V, VCE = VOUT = 0V -1 0 1 A RLOW Low Output Nch Tr. ON Resistance 2 VIN = 3.6V, VCE =0V ILXLEAKH LX Leakage Current "H" VIN = VLX = 5.5V, VCE = 0V -1 0 1 A ILXLEAKL LX Leakage Current "L" VIN = 5.5V, VCE = VLX = 0V -5 0 5 A VCEH CE Input Voltage "H" VIN = 5.5V 1.0 VCEL CE Input Voltage "L" VIN = 2.5V RONP ON Resistance of Pch Tr. VIN = 3.6V, ILX = -100mA 0.5 RONN ON Resistance of Nch Tr. VIN = 3.6V, ILX = -100mA 0.5 40 V 0.4 100 V Maxduty Maximum Duty % tSTART Soft-start Time VIN = VCE =3.6V or VSET +1V ILXLIM LX Current Limit VIN = VCE =3.6V or VSET +1V VOUT 1.2 VOUT <1.2 600 500 900 800 tPROT Protection Delay Time VIN = VCE =3.6V or VSET +1V 0.5 1.5 5 ms VUVLO1 UVLO Detector Threshold VIN = VCE 2.1 2.2 2.3 V VUVLO2 UVLO Released Voltage VIN = VCE 2.2 2.3 2.4 V 120 150 s mA Test circuit is "OPEN LOOP" and AGND=PGND=0V unless otherwise noted. 1) without auto discharge function 2) with auto discharge function 7 RP502x TEST CIRCUITS CE V OUT CE V OUT RP502x Series RP502x Series AGND PGND AGND PGND V IN V IN LX LX OSCILLOSCOPE OSCILLOSCOPE Output Voltage CE CE V OUT V OUT RP502x Series RP502x Series AGND PGND AGND PGND V IN V IN LX A LX A Supply Current 1,2 CE A Oscillator Frequency V OUT Standby Current CE V OUT RP502x Series RP502x Series AGND PGND AGND PGND V IN V IN A LX CE "H"/"L" Input Current 8 LX VOUT "H"/"L" Current RP502x CE CE V OUT V OUT RP502x Series RP502x Series AGND PGND AGND PGND OSCILLOSCOPE V IN V IN LX LX A LX Leakage Current CE Input Voltage CE CE V OUT V OUT RP502x Series RP502x Series AGND PGND AGND PGND OSCILLOSCOPE V IN V IN LX LX OSCILLOSCOPE V Pch * Nch Tr. ON resistance / Output Delay for Protection / LX Current limit Soft-start Time V OUT CE RP502x Series AGND PGND OSCILLOSCOPE V IN LX UVLO Detector Threshold * Released Voltage 9 RP502x TYPICAL APPLICATION VIN VIN CE AGND Symbol 10 2.2H/1.0H RP502x Series CIN 4.7F V OUT LX V OUT COUT 4.7F PGND Parts Recommendation CIN 4.7F Ceramic JMK107BJ475MA (TAIYO YUDEN) COUT 4.7F Ceramic JMK107BJ475MA (TAIYO YUDEN) L 2.2H NR 3010T 2R2M (TAIYO YUDEN) ,1.0H MIPS 2520 D1R0 (FDK) RP502x TECHNICAL NOTES When using the R502x Series, consider the following points: Set AGND in the same level as PGND. Set external components such as an inductor, CIN, and COUT as close as possible to the ICs. VIN, CIN and PGND have to be wired as close as possible. If the impedances of VIN line and PGND line are high, the switching current will fluctuate the electric potential of the inside the ICs. As a result, the operation may become unstable. The impedances of power supply line and PGND line must be as low as possible. Please note that a large current caused by the switching current flows into VIN, PGND, Inductor, LX, and VOUT. Separate the wiring between VOUT pin and inductor from the wiring of load. For CIN, use a ceramic capacitor with a low ESR. The recommended condenser capacity for CIN is 4.7F or more. Also, the recommended condenser capacity for COUT is 4.7F. Choose an inductor from the range of 1.0 to 2.2H. The internal phase compensation has been determined based on the above-mentioned inductor value and the COUT value. For stable operation, these conditions are necessary. Choose an inductor that is low DC resistance, has enough permissive current, and is strong against magnetic saturation. Decide the inductance value with consideration of the load current under the condition of use. If the inductance value is low, the peak value of LX current may increase along with the increase of the load current. As a result, the peak value of LX may reach to the "LX Limit Current" and may trigger the overcurrent protection circuit. Please note that overcurrent protection circuit may be affected by self-heating and heat radiation environment. The performance of power source circuits using these ICs largely depends upon the peripheral circuits. Pay attention to the setting of the peripheral components. In particular, when designing the peripheral circuit, the constant values (voltage, current and power) for each part, PCB pattern and the ICs should not be exceeded. 11 RP502x Operation of step-down DC/DC converter and Output Current The step-down DC/DC converter charges energy in the inductor when the Lx transistor is turned on, and discharges the energy when the Lx transistor is turned off. The step-down DC/DC converter also controls with the less energy loss and supplies the lower output voltage than the input voltage. The operation of the DC/DC converter will be explained with the following diagrams: <Basic Circuit> <Inductor Current > IL i1 VIN Pch Tr Nch Tr VOUT L i2 ILmax ILmin i1 topen i2 CL GND ton toff T1/fosc Step 1 : Pch Tr. turns on and current IL (=i1) flows. Then, L and CL are charged with energy. At this moment, IL (=i1) increases from ILmin (=0) to ILmax in proportion to the On-time period (ton) of Pch Tr. Step 2 : When Pch Tr. turns off, Synchronous rectifier Nch Tr. turns on and IL(=i2) flows in order to maintain IL at ILmax. Step 3: IL (=i2) starts to decrease gradually when topen time period starts. IL reaches to ILmin (IL=ILmin=0) when topen time period ends and then Nch Tr. turns off. In the continuous mode, toff time period runs out before IL becomes ILmin (IL=ILmin=0). The next cycle starts. Pch Tr. turns on and Nch Tr, turns off. Since toff time period runs out before IL becomes ILmin (IL=ILmin=0), ILmin (>0) is still remaining. In this case, IL starts increasing from ILmin (>0). In the case of PWM control system, the output voltage is maintained constant by keeping the switching time (fosc) per unit constant, and by controlling the On-time period (ton). When the step-down operation is constant and stable, as shown in the above "Inductor Current", the maximum inductor current (ILmax) will be same as the on-time period of Pch Tr. (ton) and the minimum inductor current (ILmin) will be same as the on-time period of Pch Tr. (toff). The difference between ILmax and ILmin is described as I: I = ILmax - ILmin = VOUT x topen / L = (VIN - VOUT) x ton / L ....................................Equation 1 Wherein, T = 1 / fosc = ton + toff duty (%)= ton / T x 100 = ton x fosc x 100 topen < = toff In Equation 1, "VOUT x topen / L" shows the amount of current change at the on-time. "(VIN - VOUT) x ton / L" shows the amount of current change at the off-time". 12 RP502x Discontinuous mode and Continuous mode As the following diagram shows, when the output current (IOUT) is relatively small, topen will be smaller than toff (topen < toff). In this case, the all energy charged in the inductor during the time period of ton will be discharged during the time period of toff. As a result, IL will be ILmin (=0). If IOUT is gradually increased, eventually topen will be equal to toff (topen=toff). If IOUT is further increased, ILmin will be larger than zero (ILmin>0). The former mode (topen<toff) is referred to as "discontinuous mode" and the latter mode (topen=toff) is referred to as "continuous mode". Discontinuous mode Continuous mode ILmax IL IL ILmax ILmin ILmin topen t ton T=1/fosc toff Iconst ton t toff T=1/fosc In the continuous mode, solve the equation 1 for ton, and assume that the solution is tonc. tonc = T x VOUT / VIN ..................................................................................................... Equation 2 If ton is smaller than tonc (ton<tonc), it is discontinuous mode. If ton is equal to tonc (ton=tonc), it is continuous mode. 13 RP502x Output Current and selection of External components The relation between the output current and external components is as follows: When Pch Tr. of LX is turned on: (Ripple Current p-p value is described as IRP, On Resistances of Pch Tr. and Nch Tr. are respectively described as RONP and RONN. Also, the DC resistor of the inductor is described as RL.) The time period of LX Pch Tr. being "ON" is described as ton. VIN = VOUT + (RONP + RL) x IOUT + L x IRP / ton ...............................................................Equation 3 The time period of Lx Pch Tr. being "OFF" is described as toff. (Nch Tr. is "ON"): L x IRP / toff = RONN x IOUT + VOUT + RL x IOUT .............................................................Equation 4 Substitute Equation 4 into Equation 3 to solve for ON duty of Pch Tr.: (DON = ton / (toff + ton). DON = (VOUT + RONN x IOUT + RL x IOUT) / (VIN + RONN x IOUT - RONP x IOUT) ....................Equation 5 Ripple Current is solved by the following equation: IRP = (VIN - VOUT - RONP x IOUT - RL x IOUT) x DON / fosc / L ..........................................Equation 6 Wherein, peak current that flows through L and LX Tr. is solved by the following equation: ILxmax = IOUT + IRP / 2...................................................................................................Equation 7 It is necessary to consider ILxmax when deciding the input/output conditions and selecting the peripheral components. The above calculation is based on the ideal operation of the ICs in continuous mode. 14 RP502x TIMING CHART (1) Soft-Start Time * In the case of starting the ICs with CE The ICs start to operate when the CE pin voltage (VCE) exceeds the threshold voltage. The threshold voltage is set between CE "H" input voltage (VCEH) and CE "L" input voltage (VCEL). When the ICs start to operate, the soft-start circuit also starts to operate. After a certain period of time, the reference voltage (VREF) of the inside the ICs gradually rise up to the specified value. CE Pin Input Voltage (VCE) IC Internal Voltage Reference (VREF) LX Voltage (VLX) VCEH Threshold Level VCEL Soft-start Time Soft-Start Circuit starts to operate Operate with PWM mode during the Soft-start Time Output Voltage (VOUT) Influences by Power supply, Load Current, External Components Soft-start time is the time period from when the soft-start circuit started to when the reference voltage reached to the specified value. Soft-start time may not always equal to the actual start-up time of DC/DC converter. Start-up peed could be affected by the power supply capacity, the output current value, the inductor value and capacitor value. * In the case of starting with power supply After starting up with power supply, the ICs starts to operate when the input voltage (VIN) exceeds the UVLO released voltage (VUVL02). The soft-start circuit starts to operate and then the reference voltage (VREF) of the inside the ICs gradually rise up to the specified value. Soft-start time is the time period from when the soft-start circuit started to when the reference voltage reached to the specified value. Input Voltage (VIN) Set VOUT VUVLO2 VUVLO1 Soft-start Time IC Internal Voltage Reference (VREF) LX Voltage (VLX) Operate with PWM mode during the Soft-start Time Set VOUT Output Voltage (VOUT) Influences by Power supply, Load Current, External Components The start-up speed of the output voltage could be affected by the following elements. (a) The start-up speed of the input voltage (VIN), which is determined by the power supply for the ICs and also by the input capacitor (CIN). (b) The output capacitor (COUT) value and the output current value. 15 RP502x (2) Under Voltage Lockout (UVLO) Circuit The step-down DC/DC converter stops and ON duty becomes 100%, if input voltage (VIN) becomes less than the set output voltage (Set VOUT), the output voltage (VOUT) gradually drops according to the input voltage (VIN). If the input voltage drops more and becomes less than UVLO detector threshold (VUVLO1), the under voltage lockout circuit (UVLO) operates, the IC internal reference voltage (VREF) stops, switching transistors turn off and the output voltage drops according to the load and output capacitor COUT value. To restart the normal operation, the input voltage (VIN) must be more than the UVLO released voltage (VUVLO2). The timing chart below describes the operation with varying the input voltage (VIN). Input Voltage (VIN) Set VOUT VUVLO2 VUVLO1 IC Internal Voltage Reference (VREF) Soft-start Time LX Voltage (VLX) Output Voltage Set VOUT (VOUT) Influences by Power supply, Load Current, External Components * The start-up speeds of VOUT at operation and recovery or the default voltage and the output current of COUT. Could affect on the waveform in the above chart. Therefore, the actual waveform could be slightly different from the waveform in the above chart. 16 RP502x (3) Overcurrent Protection Circuit, Latch Type Protection Circuit Overcurrent protection circuit supervises the peak current of the inductor (The current passing through Pch Tr.) at each switching cycle. If the peak current exceeds the LX current limit (ILXLIM), the overcurrent protection circuit turns off the Pch transistor. The LX current limit of the RP502x Series is set at Typ. 900mA (VOUT1.2V), and Typ. 800mA (VOUT<1.2V). Latch type protection circuit latches the built-in driver in OFF state to stop the operation of the ICs if the overcurrent status continues more than the protection delay time (tprot). LX limit current (ILXLIM) and the protection delay time (tprot) could be easily affected by self-heating and ambient environment. The drastic drop of input voltage (VIN) or the unstable input voltage caused by the short-circuiting in the output (VOUT) may affect on the protection operation and the delay time. Protection Delay Time (tprot) LX Current LX Current Limit (ILXLIM) Pch Tr. Current LX Voltage (VLX) To release the latch type protection circuit, reset the ICs by inputting "L" into CE pin or make the input voltage lower than the UVLO detector threshold (VUVL01). As the following timing chart shows, the changing process of input voltage flows as follows: start-up, stable operation, high load condition, CE reset, stable operation, input voltage drop, input voltage recovery, and stable operation. If the ICs enters the high load condition due to short-circuit or such, after the protection delay time (tprot), the built-in driver is latched in OFF state. VLX becomes "L" and then the output voltage turns off. There are two ways of releasing the latch type protection: CE reset and UVLO reset. (1) CE reset makes the CE signal to "L" once and then turns the CE signal back to "H" again. (2) UVLO rest makes the input voltage lower than the UVLO voltage (VUVL01). (1) (2) Set V OUT Input Voltage UVLO Release Voltage (VUVLO2 ) UVLO Detect Voltage (VUVLO1) (VIN) CE Pin Input Voltage (VCE) LX Voltage (VLX) Output Voltage (VOUT) UVLO Reset Set VOUT Threshold Level CE Reset Protection Delay Time Protection Delay Time Set VOUT Set VOUT Latch-type Protection Stable operation Soft-start Time Stable operation Soft-start Time Latch-type Protection Stable operation Soft-start Time 17 RP502x TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current 1) RP502x081B/083B RP502x121B/123B 1.300 0.875 VIN=3.6V 0.850 VIN=4.5V Output Voltage VOUT (V) Output Voltage VOUT (V) 0.900 0.825 0.800 0.775 0.750 0.725 0.700 1.275 VIN=3.6V 1.250 VIN=5.0V 1.225 1.200 1.175 1.150 1.125 1.100 1 10 100 1000 1 Output Current IOUT (mA) RP502x181B/183B 1.875 VIN=3.6V 1.850 VIN=5.0V Output Voltage VOUT (V) Output Voltage VOUT (V) 1000 3.000 1.825 1.800 1.775 1.750 1.725 1.700 2.975 VIN=3.9V 2.950 VIN=5.0V 2.925 2.900 2.875 2.850 2.825 2.800 1 10 100 1000 1 Output Current IOUT (mA) 10 100 1000 Output Current IOUT (mA) RP502x182B/184B RP502x332B/334B 3.400 1.875 VIN=3.6V 1.850 VIN=5.0V Output Voltage VOUT (V) 1.900 Output Voltage VOUT (V) 100 RP502x291B/293B 1.900 1.825 1.800 1.775 1.750 1.725 1.700 3.375 VIN=4.3V 3.350 VIN=5.0V 3.325 3.300 3.275 3.250 3.225 3.200 1 10 100 Output Current IOUT (mA) 18 10 Output Current IOUT (mA) 1000 1 10 100 Output Current IOUT (mA) 1000 RP502x 2) Output 2) Voltage vs. Input Voltage RP502x121B/123B 1.900 IOUT=1mA 1.275 Output Voltage VOUT (V) Output Voltage VOUT (V) 1.300 RP502x181B/183B IOUT=50mA 1.250 IOUT=250mA 1.225 1.200 1.175 1.150 1.125 1.100 IOUT=1mA 1.875 IOUT=50mA 1.850 IOUT=250mA 1.825 1.800 1.775 1.750 1.725 1.700 2.5 3.0 3.5 4.0 4.5 5.0 5.5 2.5 3.0 3.5 Input Voltage VIN (V) RP502x291B/293B Output Voltage VOUT (V) Output Voltage VOUT (V) 1.900 IOUT=1mA IOUT=50mA 2.950 IOUT=250mA 2.925 4.5 5.0 5.5 5.0 5.5 RP502x182B/184B 3.000 2.975 4.0 Input Voltage VIN (V) 2.900 2.875 2.850 2.825 2.800 IOUT=1mA 1.875 IOUT=50mA 1.850 IOUT=250mA 1.825 1.800 1.775 1.750 1.725 1.700 3.4 3.9 4.4 4.9 5.4 2.5 3.0 Input Voltage VIN (V) 3.5 4.0 4.5 Input Voltage VIN (V) 3) Output 3) Voltage vs. Temperature RP502x332B/334B RP502x16xB IOUT=1mA 3.375 IOUT=50mA 3.350 Output Voltage VOUT (V) Output Voltage VOUT (V) 3.400 IOUT=250mA 3.325 3.300 3.275 3.250 3.225 3.200 3.8 4.3 4.8 Input Voltage VIN (V) 5.3 VIN=3.6V 1.700 1.675 1.650 1.625 1.600 1.575 1.550 1.525 1.500 VOUT=1.6V -50 -25 0 25 50 75 100 Temperature Ta(C) 19 RP502x 4) Efficiency 4) vs. Output current RP502x121B/123B 100 100 90 90 80 80 70 60 50 40 VIN=3.6V 30 VIN=4.5V Efficiency (%) Efficiency (%) RP502x081B/083B 20 70 60 50 40 VIN=3.6V 30 VIN=5.0V 20 1 10 100 Output Current IOUT (mA) 1000 1 100 100 90 90 80 80 70 60 50 40 VIN=3.6V 30 VIN=5.0V 20 70 60 50 40 VIN=3.9V 30 VIN=5.0V 20 1 10 100 Output Current IOUT (mA) 1000 1 10 100 Output Current IOUT (mA) 1000 RP502x332B/334B 100 100 90 90 80 80 70 60 50 40 VIN=3.6V 30 VIN=5.0V 20 Efficiency (%) Efficiency (%) RP502x182B/184B 70 60 50 40 VIN=4.3V 30 VIN=5.0V 20 1 20 1000 RP502x291B/293B Efficiency (%) Efficiency (%) RP502x181B/183B RP502x181B/182B 10 100 Output Current IOUT (mA) 10 100 Output Current IOUT (mA) 1000 1 10 100 Output Current IOUT (mA) 1000 RP502x 6) Supply Current 1, 2 vs. Input Voltage 5) Supply Current 1, 2 vs.Temperature 1000 900 800 700 600 500 400 300 200 100 0 -50 RP502x15xB VIN=5.5V Supply Current (A) Supply Current (A) RP502x15xB IDD1 IDD2 -25 0 25 50 75 1000 900 800 700 600 500 400 300 200 100 0 100 IDD1 IDD2 2.5 3.5 Temperature Ta (C) 4.5 5.5 Input Voltage VIN (V) 7) DC/DC Output Waveform RP502x081B/083B Output Voltage IL 0.04 0.02 0.00 100 0 -100 100 200 300 Time t (s) 0.04 0.02 0.00 400 300 200 100 0 400 0 RP502x121B/123B 8 10 V IN=3.6V,I OUT =250mA 0.10 Output Voltage 0.08 Output Voltage 0.06 IL 0.06 IL 0.04 0.02 0.00 100 0 0 100 200 300 Time t (s) -100 400 Output Ripple Voltage(AC) Vripple (V) 0.08 Inductor Current IL (mA) Output Ripple Voltage(AC) Vripple (V) 4 6 Time t (s) RP502x121B/123B V IN=3.6V,IOUT =1mA 0.10 2 0.04 0.02 0.00 400 Inductor Current IL (mA) 0 0.06 Output Ripple Voltage(AC) Vripple (V) 0.06 Output Voltage IL 0.08 Inductor Current IL (mA) 0.08 V IN=3.6V,I OUT =250mA 0.10 Inductor Current IL (mA) V IN=3.6V,IOUT =1mA 0.10 Output Ripple Voltage(AC) Vripple (V) RP502x081B/083B 300 200 100 0 0 2 4 6 Time t (s) 8 10 21 RP502x RP502x181B/183B Output Voltage IL 0.04 0.02 0.00 100 0 200 300 Time t (s) -100 400 0.02 0.00 400 300 200 100 0 0 RP502x182B/184B Output Voltage IL 0.04 0.02 0.00 100 0 -100 0.0 0.5 1.0 1.5 Time t (s) 0.04 0.02 0.00 400 300 200 100 0 2.0 0 RP502x332B/334B Output Voltage IL 0.04 0.02 0.00 100 0 -100 0.0 22 0.5 1.0 1.5 Time t (s) 8 10 2.0 Output Voltage IL 0.06 Output Ripple Voltage(AC) Vripple (V) Output Ripple Voltage(AC) Vripple (V) 0.06 4 6 Time t (s) VIN=5.0V,IOUT=250mA 0.10 0.08 Inductor Current IL (mA) 0.08 2 RP502x332B/334B VIN=5.0V,IOUT=1mA 0.10 10 Output Voltage IL 0.06 Output Ripple Voltage(AC) Vripple (V) Output Ripple Voltage(AC) Vripple (V) 0.06 8 VIN=3.6V,IOUT=250mA 0.10 0.08 Inductor Current IL (mA) 0.08 4 6 Time t (s) RP502x182B/184B VIN=3.6V,IOUT=1mA 0.10 2 Inductor Current IL (mA) 100 0.04 0.04 0.02 0.00 400 300 200 100 0 0 2 4 6 Time t (s) 8 10 Inductor Current IL (mA) 0 0.06 Output Ripple Voltage(AC) Vripple (V) 0.06 Output Voltage IL 0.08 Inductor Current IL (mA) 0.08 VIN=3.6V,IOUT=250mA 0.10 Inductor Current IL (mA) VIN=3.6V,IOUT=1mA 0.10 Output Ripple Voltage(AC) Vripple (V) RP502x181B/183B RP502x 8) Oscillator Frequency vs. Temperature 9) Oscillator Frequency vs. Input Voltage RP502x12xB RP502x12xB IOUT=250A 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 -50 3.7 Frequency fosc (MHz) Frequency fosc (MHz) VIN=3.6V,IOUT=250A VIN=3.6V 3.6 3.5 3.4 3.3 3.2 -40C 3.1 25C 85C 3.0 2.9 -25 0 25 50 75 100 2.5 Temperature Ta (C) 3.5 4.5 5.5 Input Voltage VIN (V) 10) Soft-start Time vs. Temperature RP502x15xB Soft Start Time tstart (s) 140 130 120 110 100 90 80 -50 -25 0 25 50 75 100 Temperature Ta (C) 11) UVLO Detector Threshold / Released Voltage vs. Temperature Released Voltage RP502x15xB UVLO2 (V) 2.4 2.3 UVLO Voltage V UVLO Voltage V UVLO1 (V) UVLO Detector Threshold RP502x15xB 2.2 2.1 -50 -25 0 25 50 Temperature Ta (C) 75 100 2.4 2.3 2.2 2.1 -50 -25 0 25 50 75 100 Temperature Ta(C) 23 RP502x 12) CE Input Voltage vs. Temperature CE "L" Input Voltage RP502x16xB VIN=5.5V (V) 1.0 CE 0.8 CE Input Voltage V CE Input Voltage V CE (V) CE "H" Input Voltage RP502x16xB 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 VIN=2.5V 1.0 0.8 0.6 0.4 0.2 0.0 100 -50 -25 Temperature Ta (C) 0 25 50 75 100 Temperature Ta(C) 13) LX Current Limit vs. Temperature LX Current Limit Ilim (mA) RP502x15xB 1100 1050 1000 950 900 850 800 -50 -25 0 25 50 75 100 Temperature Ta (C) 14) Nch Tr. ON Resistance vs. Temperature 15) Pch Tr. ON Resistance vs.Temperature 0.6 ON () 0.5 0.4 0.3 0.2 0.1 0.0 -50 -25 0 25 50 Temperature Ta (C) 24 75 100 Nch Tr. ONResistance R Nch Tr. ONResistance R ON () 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -50 -25 0 25 50 Temperature Ta(C) 75 100 RP502x 16)CE 16) Turn on speed with CE pin RP502x081B/083B RP502x121B/123B 0 0.8 0.6 Output Voltage 0.4 0.2 3 CE Input 1.0 0.8 Output Voltage 0.6 0.4 0.2 0.0 0.0 100 200 Time t (s) 300 400 0 RP502x181B/183B 100 200 Time t (s) 1.5 1.0 Output Voltage 0.5 VIN=5.0V,ROUT=1k 6 Output Voltage VOUT (V) 0 CE Input Voltage VCE (V) 3 CE Input 0 3.0 2.5 2.0 1.5 Output Voltage 1.0 0.5 0.0 0.0 0 100 200 Time t (s) 300 0 400 RP502x182B/184B 100 200 Time t (s) 1.5 1.0 Output Voltage 0.5 0.0 VIN=5.0V,ROUT=1k 6 Output Voltage VOUT (V) 0 CE Input Voltage VCE (V) 3 CE Input 400 RP502x332B/334B VIN=3.6V,ROUT=1k 6 2.0 300 3 CE Input 0 3.0 2.0 Output Voltage 1.0 CE Input Voltage VCE (V) Output Voltage VOUT (V) 3 CE Input 400 RP502x291B/293B VIN=3.6V,ROUT=1k 6 2.0 300 CE Input Voltage VCE (V) 0 Output Voltage VOUT (V) 0 1.2 CE Input Voltage VCE (V) CE Input 1.0 VIN=3.6V,ROUT=1k 6 Output Voltage VOUT (V) 3 CE Input Voltage VCE (V) Output Voltage VOUT (V) VIN=3.6V,ROUT=1k 6 0.0 0 100 200 Time t (s) 300 400 0 100 200 Time t (s) 300 400 25 RP502x 17) Load Transient Response 0.80 Output Voltage 0.70 0 0.90 0.85 0.80 Output Voltage 0.75 0.70 80 100 0 RP502x081B/083B Output Current I 0.85 0.80 Output Voltage 0.70 600 400 200 0 0.90 0.85 0.80 Output Voltage 0.75 0.70 80 100 0 RP502x121B/123B 1.20 Output Voltage 1.10 Output Current 300mA --> 1mA (V) OUT Output Voltage V (mA) Output Current I (V) OUT 0 1.25 1.15 800 1000 V IN=3.6V 400 200 Output Current 1mA --> 300mA 400 600 Time t (s) RP502x121B/123B OUT V IN=3.6V 200 400 200 0 1.30 1.25 1.20 1.15 Output Voltage 1.10 0 20 40 60 Time t (s) 80 100 0 200 400 600 Time t (s) 800 (mA) 40 60 Time t (s) OUT 20 Output Current I 0 Output Voltage V 1000 Output Current 500mA --> 200mA OUT (V) 0 Output Voltage V OUT Output Voltage V 400 200 0.75 800 V IN=3.6V 600 (mA) (V) Output Current 200mA --> 500mA 400 600 Time t (s) RP502x081B/083B OUT V IN=3.6V 200 (mA) 40 60 Time t (s) OUT 20 Output Current I 0 26 200 (mA) OUT (V) Output Current 300mA --> 1mA 400 Output Current I 0.85 Output Voltage V Output Current I OUT Output Voltage V 200 0 0.75 V IN=3.6V 400 (mA) Output Current 1mA --> 300mA RP502x081B/083B OUT (V) V IN=3.6V OUT RP502x081B/083B 1000 RP502x 400 200 0 1.25 1.20 Output Voltage 1.15 VIN=3.6V 600 Output Voltage VOUT (V) Output Current 200mA --> 500mA RP502x121B/123B Output Current IOUT (mA) 1.10 200 1.30 0 1.25 1.20 1.15 Output Voltage 40 60 Time t (s) 80 100 0 200 600 800 1000 Time t (s) 200 0 1.90 VIN=3.6V 400 1.85 1.80 Output Voltage Output Voltage VOUT (V) Output Current 1mA --> 300mA RP502x181B/183B Output Current IOUT (mA) VIN=3.6V 1.75 400 1.70 Output Current 300mA --> 1mA 400 200 0 1.90 1.85 1.80 Output Voltage 1.75 Output Current IOUT (mA) 20 RP502x181B/183B Output Voltage VOUT (V) 400 Output Current 500mA --> 200mA 1.10 0 1.70 0 20 40 60 Time t (s) 80 100 0 200 RP502x181B/183B 400 200 1.90 0 1.85 1.80 Output Voltage 1.75 800 1000 VIN=3.6V 600 1.70 Output Voltage VOUT (V) Output Current 200mA --> 500mA 400 600 Time t (s) RP502x181B/183B Output Current IOUT (mA) VIN=3.6V Output Voltage VOUT (V) 600 Output Current 500mA --> 200mA 600 400 200 1.90 0 1.85 1.80 1.75 Output Voltage Output Current IOUT (mA) Output Voltage VOUT (V) VIN=3.6V Output Current IOUT (mA) RP502x121B/123B 1.70 0 20 40 60 Time t (s) 80 100 0 20 40 60 Time t (s) 80 100 27 RP502x 200 0 1.90 1.85 1.80 Output Voltage 1.75 VIN=3.6V 400 Output Voltage VOUT (V) Output Current 1mA --> 300mA RP502x182B/184B Output Current IOUT (mA) 1.70 Output Current 300mA --> 1mA 0 1.90 1.85 1.80 Output Voltage 1.75 40 60 Time t (s) 80 100 0 200 400 200 1.90 0 1.85 1.80 Output Voltage 1.75 1000 VIN=3.6V 600 Output Voltage VOUT (V) Output Current 200mA --> 500mA 800 RP502x182B/184B Output Current IOUT (mA) Output Voltage VOUT (V) VIN=3.6V 400 600 Time t (s) 1.70 600 400 Output Current 500mA --> 200mA 200 1.90 0 1.85 1.80 1.75 Output Voltage Output Current IOUT (mA) 20 RP502x182B/184B 1.70 0 20 40 60 Time t (s) 80 100 0 RP502x332B/334B 200 0 3.35 3.30 3.25 40 60 Time t (s) 80 100 VIN=5.0V 400 Output Voltage 3.20 3.15 3.10 Output Voltage VOUT (V) Output Current 1mA --> 300mA 20 RP502x332B/334B Output Current IOUT (mA) VIN=5.0V Output Voltage VOUT (V) 200 1.70 0 Output Current 300mA --> 1mA 400 200 0 3.35 3.30 3.25 3.20 Output Voltage 3.15 3.10 0 28 400 20 40 60 Time t (s) 80 100 0 200 400 600 Time t (s) 800 1000 Output Current IOUT (mA) Output Voltage VOUT (V) VIN=3.6V Output Current IOUT (mA) RP502x182B/184B RP502x 400 200 0 3.35 3.30 3.25 3.20 Output Voltage 3.15 VIN=5.0V 600 3.10 Output Voltage VOUT (V) Output Current 200mA --> 500mA RP502x332B/334B Output Current IOUT (mA) Output Voltage VOUT (V) VIN=5.0V Output Current 500mA --> 200mA 600 400 200 0 3.35 3.30 3.25 3.20 Output Voltage 3.15 Output Current IOUT (mA) RP502x332B/334B 3.10 0 20 40 60 Time t (s) 80 100 0 20 40 60 Time t (s) 80 100 29 1. The products and the product specifications described in this document are subject to change or discontinuation of production without notice for reasons such as improvement. Therefore, before deciding to use the products, please refer to Ricoh sales representatives for the latest information thereon. 2. The materials in this document may not be copied or otherwise reproduced in whole or in part without prior written consent of Ricoh. 3. Please be sure to take any necessary formalities under relevant laws or regulations before exporting or otherwise taking out of your country the products or the technical information described herein. 4. The technical information described in this document shows typical characteristics of and example application circuits for the products. The release of such information is not to be construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual property rights or any other rights. 5. 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