RP500x SERIES 600mA Step-down DC/DC Converter with Synchronous Rectifier NO.EA-155-100802 OUTLINE The RP500x Series are 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, protection circuits, UVLO 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 24mV tolerance depending on the output voltage is guaranteed. Mode alternative circuit works automatically for improving the efficiency. Considering fixed noise frequency, PWM fixed control type is also available. 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, DFN(PLP)1820-6, SOT-23-6W, 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. 400A (at PWM mode) Typ. 100A (at VFM mode) * Standby Current ....................................................Max. 5A * Input Voltage Range .............................................2.55V to 5.50V * Output Voltage Range...........................................1.1V to 3.3V (0.1V steps) (For other voltages, please refer to MARK INFORMATIONS.) * Output Voltage Accuracy.......................................1.5% (VOUT1.6V), 24mV (VOUT<1.6V) * Temperature-Drift Coefficient of Output Voltage ...Typ. 100ppm/C * Oscillator Frequency .............................................Typ. 1.2MHz * Oscillator Maximum Duty Cycle ............................Min. 100% * Built-in Driver ON Resistance ...............................Typ. Pch. 0.3, Nch. 0.38 (VIN=3.6V) * UVLO Detector Threshold.....................................Typ. 2.2V * Soft Start Time.......................................................Typ. 120s * Lx Current Limit.....................................................Typ. 900mA * Latch type Protection Circuit .................................Typ. 1.5ms * Two choices of Switching Mode............................Automatic PWM/VFM mode change / PWM fixed * Packages ..............................................................WLCSP-6-P2, DFN1616-6, DFN(PLP)1820-6, SOT-23-6W APPLICATIONS * Power source for battery-powered equipment. * Power source for hand-held communication equipment, cameras, VCRs, camcorders. * Power source for HDD, portable equipment. 1 RP500x BLOCK DIAGRAMS RP500xxx1A/2A VIN CE Chip Enable Ramp Compensation Current Feedback OSC Vref Current Protection LX Switching Control PWM Control Soft Start UVLO VOUT AGND PGND ) only RP500xxx1A for automatic PWM/VFM mode change RP500xxx3A/4A VIN CE Chip Enable Ramp Compensation Current Feedback OSC Vref Soft Start Current Protection PWM Control LX Switching Control UVLO VOUT AGND PGND ) only RP500xxx3A for automatic PWM/VFM mode change 2 RP500x SELECTION GUIDE The output voltage, switching mode, and auto discharge function for the ICs can be selected at the user's request. Product Name Package Quantity per Reel Pb Free Halogen Free WLCSP-6-P2 5,000 pcs Yes Yes RP500LxxA-TR DFN1616-6 5,000 pcs Yes Yes RP500KxxA-TR DFN(PLP)1820-6 5,000 pcs Yes Yes SOT-23-6W 3,000 pcs Yes Yes RP500ZxxA-E2-F RP500NxxA-TR-FE 1 xx : The output voltage can be designated in the range from 1.1V(11) 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. Code Modulation method Auto discharge function 1 PWM/VFM auto switching No 2 PWM fixed No 3 PWM/VFM auto switching Yes 4 PWM fixed Yes (The RP500Kxx3A does not exist. Please use RP500Lxx3A.) 1) 0.05V step is also available as a custom code. 3 RP500x PIN CONFIGURATIONS * WLCSP-6-P2 * DFN1616-6 Bump Side Mark Side Top View 6 6 5 4 4 5 5 Bottom View 4 4 5 6 6 1 2 3 3 2 1 1 * DFN(PLP)1820-6 Top View 6 5 2 3 * SOT-23-6W 6 Bottom View 4 4 3 5 5 4 6 (mark side) 1 2 3 3 2 1 1 2 3 PIN DESCRIPTIONS * * WLCSP-6-P2, SOT-23-6W 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, DFN(PLP)1820-6 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. 4 2 1 RP500x ABSOLUTE MAXIMUM RATINGS Symbol AGND=PGND=0V Item Rating Unit VIN Input Voltage -0.3 to 6.5 V VLx Lx pin Voltage -0.3 to VIN+0.3 V VCE CE Pin Input Voltage -0.3 to 6.5 V VOUT Output Voltage -0.3 to 6.5 V 800 mA ILx Lx Pin Output Current Power Dissipation (WLCSP-6-P2) PD Power Dissipation (DFN1616-6) Power Dissipation (DFN(PLP)1820-6) Power Dissipation (SOT-23-6W) 650 640 880 mW 430 Topt Operating Temperature Range -40 to 85 C Tstg 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 life time 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. 5 RP500x ELECTRICAL CHARACTERISTICS * RP500x Symbol VIN Topt=25C Item Conditions Max. Unit 2.55 5.5 V VOUT 1.6V x0.985 x1.015 V VOUT < 1.6V -24 24 mV Operating Input Voltage Min. Typ. Output Voltage VIN=VCE=3.6V or Set VOUT+1V Output Voltage Temperature Coefficient -40CTopt85C fosc Oscillator Frequency VIN=VCE=3.6V or Set VOUT+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 RONP ON Resistance of Pch Tr. VIN=3.6V, ILX=-100mA 0.3 RONN ON Resistance of Nch Tr. VIN=3.6V, ILX=-100mA 0.38 ILXleakH Lx Leakage Current "H" VIN=VLX=5.5V, VCE=0V -1 0 5 A ILXleakL Lx Leakage Current "L" VIN=5.5V, VCE=VLX=0V -5 0 1 A VIN=VOUT=5.5V, VCE=0V -1 0 1 A VOUT VOUT/Topt 1 ppm /C 100 0.96 1.2 1.44 MHz 400 500 A PWM/VFM 100 160 PWM fixed 400 500 0 5 A A IVOUTH VOUT "H" Input Current IVOUTL VOUT "L" Input Current VIN=5.5V, VCE=VOUT=0V -1 0 1 A ICEH CE "H" Input Current VIN=VCE=5.5V -1 0 1 A ICEL CE "L" Input Current VIN=5.5V, VCE=0V -1 0 1 A VCEH CE Input Voltage "H" VIN=5.5V 1.0 VCEL CE Input Voltage "L" VIN=5.5V Maxduty Oscillator Maximum Duty Cycle V 0.4 100 V % tstart Soft-start Time VIN=VCE=3.6V or Set VOUT+1V ILXlim Lx Current Limit VIN=VCE=3.6V or Set VOUT+1V 600 900 tprot Protection Delay Time VIN=VCE=3.6V or Set VOUT+1V 0.5 1.5 5.0 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 RLOW Low Output Nch Tr. ON Resistance 2 VIN=3.6V, VCE=0V 120 150 s mA 80 Test circuit is "OPEN LOOP" and AGND=PGND=0V unless otherwise noted. 1) without auto discharge version only 2) with auto discharge version only 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 RP500x TEST CIRCUITS CE VOUT CE VOUT RP500x Series RP500x Series AGND PGND AGND PGND VIN VIN LX LX OSCILLOSCOPE OSCILLOSCOPE Output Voltage CE VOUT CE VOUT RP500x Series RP500x Series AGND PGND AGND PGND VIN VIN LX A LX A Supply Current 1,2 CE A Oscillator Frequency VOUT Standby Current CE VOUT RP500x Series RP500x Series AGND PGND AGND PGND VIN VIN A LX CE "H"/"L" Input Current LX VOUT "H"/"L" Current 7 RP500x CE VOUT CE VOUT RP500x Series RP500x Series AGND PGND AGND PGND OSCILLOSCOPE VIN LX VIN LX A Lx Leakage Current CE CE Input Voltage VOUT CE RP500x Series VOUT RP500x Series AGND PGND AGND PGND OSCILLOSCOPE VIN VIN LX LX OSCILLOSCOPE V Pch * Nch transistor ON resistance / Output Delay for Protection / Lx Current limit CE VOUT RP500x Series AGND PGND OSCILLOSCOPE VIN LX UVLO Detector Threshold * Released Voltage 8 Soft-start Time RP500x TYPICAL APPLICATION VIN VIN RP500x Series CE VOUT CIN 10F AGND Symbol VOUT LX 4.7H COUT 10F PGND Parts Recommendation CIN 10F Ceramic C2012JB0J106K (TDK) COUT 10F Ceramic C2012JB0J106K (TDK) L 4.7H VLF3010AT-4R7MR30 TECHNICAL NOTES When using these ICs, consider the following points: Set the same level as AGND and PGND. Set external components such as an inductor, CIN, COUT as close as possible to the IC, in particular, minimize the wiring to VIN pin and PGND pin. Reinforce the VIN, PGND, and VOUT lines sufficiently. Large switching current may flow in these lines. If the impedance of VIN and PGND lines is too large, the internal voltage level in this IC may shift caused by the switching current, and the operation might be unstable. The wiring between VOUT and load and between L and VOUT should be separated. Use an external capacitor CIN between VIN and GND, and COUT with a capacity of 10F or more ceramic type. Choose an inductor with inductance range from 4.7H to 10H. The phase compensation has been made by these values with output capacitors. The recommendation characteristics of the inductor are low DC resistance, large enough permissible current, and strong against the magnetic saturation. Inductance value may shift depending on an inductor. If the inductance value at an actual load current is low, Lx peak current may increase and may overlap the Lx current limit. As a result, over current protection may work. Over current protection circuit may be affected by self-heating and heat radiation environment. The performance of power source circuits using these ICs extremely depends upon the peripheral circuits. Pay attention in the selection of the peripheral circuits. In particular, design the peripheral circuits in a way that the values such as voltage, current, and power of each component, PCB patterns and the IC do not exceed their respected rated values. (such as the voltage, current, and power) 9 RP500x Operation of step-down DC/DC converter and Output Current The DC/DC converter charges energy in the inductor when LX transistor is ON, and discharges the energy from the inductor when LX transistor is OFF and controls with less energy loss, so that a lower output voltage than the input voltage is obtained. The operation will be explained with reference to the following diagrams: <Basic Circuit> <Current through L> IL i1 VIN Pch Tr Nch Tr VOUT L i2 ILmax ILmin i1 topen i2 CL GND ton toff T=1/fosc Step 1 : Pch Tr. turns on and current IL (=i1) flows, and energy is charged into CL. At this moment, IL increases from ILmin (=0) to reach 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 in order that L maintains IL at ILmax, and current IL (=i2) flows. Step 3: IL (=i2) decreases gradually and reaches IL=ILmin=0 after a time period of topen, and Nch Tr. turns off. Provided that in the continuous mode, next cycle starts before IL becomes to 0 because toff time is not enough. In this case, IL value increases from this ILmin (>0). 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 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 and (VIN - VOUT) x ton / L respectively show the change of the current at "ON", and the change of the current at "OFF". 10 RP500x Discontinuous mode and Continuous mode When the output current (IOUT) is relatively small, topen < toff as illustrated in the following 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 ton t toff T=1/fosc In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc, tonc = T x VOUT / VIN ....................................................................................................... Equation 2 When ton<tonc, the mode is the discontinuous mode, and when ton=tonc, the mode is the continuous mode. 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 ON: (Wherein, Ripple Current p-p value is described as IRP, ON resistance of Pch Tr. and Nch Tr. of LX are respectively described as RONP and RONN, and the DC resistor of the inductor is described as RL.) VIN = VOUT + (RONP + RL) x IOUT + L x IRP / ton.................................................................. Equation 3 When Pch Tr. of LX is "OFF" (Nch Tr. is "ON"): L x IRP / toff = RONN x IOUT + VOUT + RL x IOUT ................................................................ Equation 4 Put Equation 4 to Equation 3 and solve for ON duty of Pch transistor, DON = ton / (toff + ton), DON = (VOUT + RONN x IOUT + RL x IOUT) / (VIN + RONN x IOUT - RONP x IOUT) ....................... Equation 5 11 RP500x Ripple Current is as follows: 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 as follows: ILxmax = IOUT + IRP / 2 .....................................................................................................Equation 7 Consider ILxmax, condition of input and output and select external components. The above explanation is directed to the calculation in an ideal case in continuous mode. 12 RP500x TIMING CHART (1) Soft Start Time * In the case of starting this IC with CE In the case of starting this IC with CE, the operation can be as in the timing chart below. When the voltage of CE pin (VCE) is beyond the threshold level, the operation of the IC starts. The threshold voltage of CE pin is in between CE "H" input voltage (VCEH) and CE "L" input voltage (VCEL) described in the electrical characteristics table. Soft-start circuit operates, and after the certain time, the reference voltage inside the IC (VREF) is rising gradually up to the constant value. CE Pin Input Voltage (VCE) IC Internal Voltage Reference (VREF) Lx Voltage (VLX) VCEH Threshold Level VCEL Soft-start Time Soft-start Circuit operating PWM mode operating during the Soft-start Time Output Voltage (VOUT) Depending on Power supply, Load Current, External Components Soft-start time is the time interval from soft start circuit starting point to the reference voltage level reaching point up to this constant level. Soft start time is not always equal to the turn-on speed of DC/DC converter. The power supply capacity for this IC, load current, inductance and capacitance values affect the turn-on speed. * In the case of starting with power supply In the case of starting with power supply, when the input voltage (VIN) is larger than UVLO released voltage (VUVLO2), soft start circuit operates, and after that, the same explanation above is applied to the operation. Soft-start time is the time interval from soft start circuit starting point to the reference voltage level reaching point up to this constant level. Input Voltage (VIN) Set VOUT VUVLO2 VUVLO1 Soft-start Time IC Internal Voltage Reference (VREF) Lx Voltage (VLX) PWM mode operating during the Soft-start Time Set VOUT Output Voltage (VOUT) Depending on Power supply, Load Current, External Components Turn-on speed is affected by next conditions; (a) Input Voltage (VIN) rising speed depending on the power supplier to the IC and input capacitor CIN. (b) Output Capacitor COUT value and load current value. 13 RP500x (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) Depending on Power supply, Load Current, External Components Actually, the waveform of VOUT at UVLO working and releasing varies depending on the initial voltage of COUT and load current situation. 14 RP500x (3) Over Current Protection Circuit, Latch Type Protection Circuit Over current protection circuit supervises the coil peak current (the current flowing Pch transistor) at each switching cycle, and if the current beyond the Lx current limit (ILXlim), Pch transistor is turned off. the Lx current limit of RP500x is Typ.900mA. Further, if the over current status continues equal or longer than protection delay time, or, when the Lx limit current is exceeded even once when the driver operates by duty 100%, a built-in driver is latched in the OFF state and the operation of DC/DC converter stops. Lx current limit and protection delay time is affected by self-heating and ambient environment. If the output is short and the input voltage (VIN) is drastically dropped or becomes unstable, the protection operation and delay time may vary. Protection Delay Time (tprot) Lx Current Lx Current Limit (ILXlim) Pch Tr. Current Lx Voltage (VLX) To release the condition of latch type protection, restart this IC by inputting "L" signal to CE pin, or restart this IC with power-on or make the supply voltage lower than UVLO detector threshold (VUVLO1) level. The timing chart shown below describes the changing process of input voltage rising, stable operating, operating with large current, reset with CE pin, stable operating, input voltage falling, input voltage recovering, and stable operating. If too large current flows through the circuit because of short or other reasons, after the delay time of latch type protection a built-in driver is latched in the OFF state and VLX signal will be "L", then output will turn off. At the point (1), release the latch type protection is realized with CE reset as changed CE signal from "L" to "H". At the point (2), release the latch type protection is realized with UVLO reset as make the supply voltage lower than UVLO detector threshold (VUVLO1) level. 1 2 Set VOUT 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 15 RP500x TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current RP500x121A/123A RP500x181A/183A 2.0 Output Voltage VOUT (V) Output Voltage VOUT (V) 1.4 1.3 1.2 VIN=5V VIN=3.6V 1.1 1.0 1.9 1.8 VIN=5V VIN=3.6V 1.7 1.6 1 10 100 Output Current IOUT (mA) 1000 1 RP500x251A/253A Output Voltage VOUT (V) Output Voltage VOUT (V) 3.5 2.6 2.5 VIN=5V VIN=3.6V 2.4 2.3 3.4 3.3 VIN=5V VIN=4.3V 3.2 3.1 1 10 100 Output Current IOUT (mA) 1000 RP500x152A/154A 1.7 Output Voltage VOUT (V) 1000 RP500x331A/333A 2.7 1.6 1.5 VIN=5V VIN=3.6V 1.4 1.3 1 16 10 100 Output Current IOUT (mA) 10 100 Output Current IOUT (mA) 1000 1 10 100 Output Current IOUT (mA) 1000 RP500x 2) Output Voltage vs. Input Voltage RP500x121A/123A RP500x251A/253A 2.56 IOUT=1mA IOUT=50mA IOUT=200mA 1.22 1.21 Output Voltage VOUT (V) Output Voltage VOUT (V) 1.23 1.20 1.19 1.18 1.17 3.0 3.5 4.0 4.5 5.0 Input Voltage VIN (V) IOUT=1mA IOUT=50mA IOUT=200mA 2.54 2.52 2.50 2.48 2.46 2.44 2.6 5.5 RP500x331A/333A 3.6 4.1 4.6 Input Voltage VIN (V) 5.1 RP500x152A/154A 3.36 1.53 IOUT=1mA IOUT=50mA IOUT=200mA 3.34 3.32 Output Voltage VOUT (V) Output Voltage VOUT (V) 3.1 3.30 3.28 3.26 3.24 3.0 3.5 4.0 4.5 5.0 Input Voltage VIN (V) IOUT=1mA IOUT=50mA IOUT=200mA 1.52 1.51 1.50 1.49 1.48 1.47 3.0 5.5 3.5 4.0 4.5 5.0 Input Voltage VIN (V) 5.5 3) Efficiency vs. Output Current RP500x181A/183A 100 90 90 (%) 100 80 Efficiency Efficiency (%) RP500x121A/123A 70 60 VIN=2.5V VIN=3.6V VIN=5V 50 80 70 60 VIN=3.6V VIN=5V 50 40 40 1 10 100 Output Current IOUT (mA) 1000 1 10 100 Output Current IOUT (mA) 1000 17 RP500x RP500x331A/333A 100 90 90 (%) 100 80 Efficiency Efficiency (%) RP500x251A/253A 70 60 VIN=3.6V VIN=5V 50 80 70 60 VIN=4.3V VIN=5V 50 40 40 1 10 100 Output Current IOUT (mA) 1000 1 10 100 Output Current IOUT (mA) 1000 RP500x152A/154A 100 Efficiency (%) 90 80 70 60 VIN=3.6V VIN=5V 50 40 1 10 100 Output Current IOUT (mA) 1000 4) Supply Current 1, 2 vs. Temperature 5) Supply Current 1, 2 vs. Input Voltage RP500x15xA RP500x15xA VIN=VCE=5.5V 500 400 300 200 IDD2 100 0 -40 -25 18 0 25 50 Temperature Topt (C) 500 Supply Current IDD (A) Supply Current IDD (A) IDD1 75 85 400 IDD1 300 200 100 0 2.5 IDD2 3.5 4.5 Input Voltage VIN (V) 5.5 RP500x 6) DC/DC Output Waveform (CIN=COUT=10F, L=4.7H) RP500x121A/123A RP500x12xA IOUT=200mA IOUT=1mA 1.24 Output Voltage VOUT (V) Output Voltage VOUT (V) 1.26 1.24 1.22 1.20 1.18 1.16 1.14 1.22 1.20 1.18 1.16 0 0.5 1.0 Time t (ms) 1.5 0 1 2 RP500x251A/253A RP500x25xA IOUT=200mA IOUT=1mA 2.54 Output Voltage VOUT (V) Output Voltage VOUT (V) 2.56 2.54 2.52 2.50 2.48 2.46 2.44 2.52 2.50 2.48 2.46 0 0.5 1.0 Time t (ms) 1.5 0 1 2 3 Time t (s) RP500x331A/333A RP500x33xA IOUT=200mA IOUT=1mA 3.34 Output Voltage VOUT (V) 3.36 Output Voltage VOUT (V) 3 Time t (s) 3.34 3.32 3.30 3.28 3.26 3.24 3.32 3.30 3.28 3.26 0 0.5 1.0 Time t (ms) 1.5 0 1 2 3 Time t (s) 19 RP500x 7) Output Voltage vs. Temperature RP500x15xA RP500x33xA 3.36 Output Voltage VOUT (V) Output Voltage VOUT (V) 1.53 1.52 1.51 1.50 1.49 1.48 1.47 -40 -25 0 25 50 Temperature Topt (C) 3.32 3.30 3.28 3.26 3.24 -40 -25 75 85 8) Oscillator Frequency vs. Temperature 3.34 VIN=3.6V 1350 Frequency fOSC (kHz) Frequency fOSC (kHz) RP500x15xA 1300 1250 1200 1150 1100 1050 -40 -25 0 25 50 Temperature Topt (C) 1300 1250 1150 1100 5.5 RP500x15xA 2.5 UVLO Voltage VUVLO (V) 160 Soft Start Time tstart (s) 3.5 4.5 Input Voltage VIN (V) 11) UVLO Detector Threshold/ Released Voltage vs. Temperature RP500x16xA 20 IOUT=-40C IOUT=25C IOUT=85C 1200 1050 2.5 75 85 10) Soft-start Time vs. Temperature 150 140 130 120 110 100 -40 -25 75 85 9) Oscillator Frequency vs. Input Voltage RP500x15xA 1350 0 25 50 Temperature Topt (C) 0 25 50 Temperature Topt (C) 75 85 2.4 2.3 2.2 2.1 -40 -25 UVLO Released Voltage UVLO Detector Threshold 0 25 50 Temperature Topt (C) 75 85 RP500x 12) CE Input vs. Temperature 13) Lx Current Limit vs. Temperature RP500x15xA 1.0 1000 LX Limit Current ILXLimit (mA) CE Input Threshold Voltage VCE (V) RP500x15xA 0.8 0.6 0.4 0.2 0 -40 -25 0 25 50 Temperature Topt (C) 900 800 700 600 -40 -25 75 85 14) Nch Tr. ON Resistance vs. Temperature 0 25 50 Temperature Topt (C) 15) Pch Tr. ON Resistance vs. Temperature RP500x15xA 0.6 PchTr. ON Resistance RONP () NchTr. ON Resistance RONN () RP500x15xA 0.5 0.4 0.3 0.2 0.1 0 -40 -25 75 85 0 25 50 Temperature Topt (C) 75 85 0.6 0.5 0.4 0.3 0.2 0.1 0 -40 -25 0 25 50 Temperature Topt (C) 75 85 16) Turn on speed with CE pin (CIN=COUT=Ceramic 10F, L=4.7H) RP500x111A/113A (IOUT=1.1mA) RP500x251A/253A (IOUT=2.5mA) 0 1.2 1.0 Output Voltage 0.8 0.6 0.4 0.2 CE Input Voltage 2.5 0 100 200 Time t (s) 300 400 Output Voltage 2.0 1.5 1.0 0.5 0 0 0 3.0 100 200 Time t (s) 300 CE Input Voltage VCE (V) 3 Output Voltage VOUT (V) 6 2 CE Input Voltage VCE (V) CE Input Voltage VIN=5V 4 0 Output Voltage VOUT (V) VIN=3.6V 400 21 RP500x RP500x331A/333A (IOUT=3.3mA) RP500x152A/154A (IOUT=1.5mA) VIN=5V VIN=3.6V 4 3 Output Voltage 2 1 Output Voltage VOUT (V) 0 CE Input Voltage VCE (V) Output Voltage VOUT (V) 3 CE Input Voltage 2 CE Input Voltage 0 2.0 1.5 Output Voltage 1.0 0.5 CE Input Voltage VCE (V) 4 6 0 0 0 100 200 Time t (s) 300 400 0 100 200 Time t (s) 300 400 17) Load Transient Response (CIN=COUT=Ceramic 10F, L=4.7H) RP500x121A/123A RP500x121A/123A VIN=3.6V VIN=3.6V 1.15 1.10 Output Current 0mA 200mA 200 0 20 40 60 Time t (s) 80 Output Voltage VOUT (V) Output Voltage Output Current IOUT (mA) 1.25 Output Voltage 1.20 1.15 0 100 0 200 RP500x12xA 400 600 Time t (s) 800 VIN=3.6V VIN=3.6V 1.30 Output Voltage 1.15 400 Output Current 100mA 400mA 0 20 40 60 Time t (s) 80 200 0 100 Output Voltage VOUT (V) 1.20 Output Current IOUT (mA) Output Voltage VOUT (V) 0 1000 RP500x12xA 1.25 22 200 Output Current 200mA 0mA 1.25 1.20 Output Voltage 1.15 400 Output Current 400mA 100mA 0 20 40 60 Time t (s) 80 200 0 100 Output Current IOUT (mA) Output Voltage VOUT (V) 1.20 Output Current IOUT (mA) 1.30 1.25 RP500x RP500x251A/253A RP500x251A/253A VIN=5.0V VIN=5.0V 2.45 2.40 Output Current 0mA 200mA 200 0 20 40 60 Time t (s) 80 Output Voltage VOUT (V) Output Voltage Output Current IOUT (mA) 2.55 Output Voltage 2.50 2.45 0 100 0 200 RP500x25xA 400 600 Time t (s) 800 VIN=5.0V VIN=5.0V Output Voltage 2.45 400 Output Current 100mA 400mA 0 20 40 60 Time t (s) 80 200 Output Voltage VOUT (V) 2.50 2.50 Output Voltage 2.45 400 Output Current 400mA 100mA 0 100 0 RP500x331A/333A 20 40 60 Time t (s) 80 200 Output Current IOUT (mA) 2.55 Output Current IOUT (mA) Output Voltage VOUT (V) 0 1000 RP500x25xA 2.55 0 100 RP500x331A/333A VIN=5.0V VIN=5.0V 3.35 3.30 Output Voltage 3.25 3.20 Output Current 0mA 200mA 400 200 0 20 40 60 Time t (s) 80 0 100 Output Voltage VOUT (V) 3.40 Output Current IOUT (mA) Output Voltage VOUT (V) 200 Output Current 200mA 0mA 3.35 Output Voltage 3.30 3.25 Output Current 200mA 0mA 0 200 400 600 Time t (s) 800 200 Output Current IOUT (mA) Output Voltage VOUT (V) 2.50 Output Current IOUT (mA) 2.60 2.55 0 1000 23 RP500x RP500x33xA RP500x33xA VIN=5.0V VIN=5.0V 3.25 400 Output Current 100mA 400mA 0 20 40 60 Time t (s) 80 200 Output Voltage VOUT (V) Output Voltage Output Current IOUT (mA) 3.30 Output Voltage 3.25 400 Output Current 400mA 100mA 0 100 0 RP500x152A/154A 20 40 60 Time t (s) 80 VIN=3.6V VIN=3.6V 1.45 1.40 Output Current 0mA 200mA 200 20 40 60 Time t (s) 80 1.55 Output Voltage 1.50 1.45 200 Output Current 200mA 0mA 0 100 0 200 RP500x15xA 400 600 Time t (s) 800 Output Current IOUT (mA) Output Voltage Output Voltage VOUT (V) 1.50 Output Current IOUT (mA) Output Voltage VOUT (V) 1.60 0 0 1000 RP500x15xA VIN=3.6V VIN=3.6V 1.55 Output Voltage 1.45 400 Output Current 100mA 400mA 0 20 40 60 Time t (s) 80 200 0 100 Output Voltage VOUT (V) 1.50 Output Current IOUT (mA) 1.55 Output Voltage VOUT (V) 0 100 RP500x152A/154A 1.55 24 200 1.50 Output Voltage 1.45 400 Output Current 400mA 100mA 0 20 40 60 Time t (s) 80 200 0 100 Output Current IOUT (mA) Output Voltage VOUT (V) 3.30 Output Current IOUT (mA) 3.35 3.35 1. 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