R1242S SERIES 30V Input 3A Buck DC/DC converter NO.EA-191-130312 OUTLINE The R1242S Series are CMOS-based 30V Input, 3A, Synchronous Rectified Step-down DC/DC Converters with built-in Highside Switch. Each of these ICs contains Nch Highside Tr. (Typ. 0.1) and can supply maximum 3A output current. In order to reduce heat generation caused by energy loss, FET can be used as Lowside switch. Lowside switch turns off when ICs shut down. Each of these ICs consists of the followings: an oscillator, a PWM control circuit, a voltage reference unit, an error amplifier, a phase compensation circuit, a slope control circuit, a soft-start circuit, protection circuits, an internal regulator, a switch, and so on. Also, each of these ICs consists of the following external components: an inductor, resistors, an external FET, and capacitors. The R1242S Series operates with Current Mode Topology, which does not require any sense resistor. As a result, these ICs can achieve high speed and high efficiency. The oscillator frequencies for each version are set as follows; adjustable between 330kHz to 1000kHz for versions A and B, 330kHz for versions C and D, 500kHz for versions E and F, and 1000kHz for versions G and H. Each of these ICs are equipped with the protection functions, such as Peak Current Limit function, Latch function, Fold back function, Thermal-Shutdown function, and Undervoltage-Lockout (UVLO) function. Peak Current Limit function restricts the maximum current into 4.5A. Latch function (comes with versions A, C, E, and G) shuts off the output if current limit detection continues for a certain period of time. Fold back function (comes with versions B, D, F, and H) reduces the initial oscillator frequencies into 1/4 when output is short-circuited. FEATURES * * * * * * * * * * * * * * * * * * * * Operating Voltage ............................................................ 5V ~ 30V Supply Current ................................................................. Typ. 0.8mA (Set VOUT=1.0V@VIN=30V) Internal Nch MOSFET Driver (Ron=100mTyp.) External Nch MOSFET Drive Buffer for Synchronous Operation Adjustable Output Voltage with External Resistor ........... 0.8V ~ 15V Feed Back Voltage........................................................... 0.8V with 1.5% accuracy Output Current ................................................................. 3A Peak Current Limit Function ............................................ Typ. 4.5A UVLO Function Internal Soft Start Time .................................................... Typ. 0.5ms Maximum Duty Cycle ....................................................... Typ. 88% UVLO Detector Threshold................................................ Typ. 3.6V Thermal Shutdown Function ............................................ Typ. 160C, with 30C hysteresis Operating Frequency ....................................................... Version A/B adjustable from 330kHz to 1MHz Version C/D 330kHz Version E/F 500kHz Version G/H 1000kHz Built-in Foldback Protection and its frequency................. 1/4 at fold condition: Ver.B 83kHz: Ver.D, 125kHz: Ver.F, 250kHz: Ver.H Short Protection Function for Internal Boost Regulator Short Protection delay time for Output Latch................... Typ. 5ms : Ver.A/C/E/G Ceramic Capacitor Compatible Stand-by Function: 0A (Typ.), Max. 20A (@VIN=30V, CE="L") Package ........................................................................... HSOP-8E 1 R1242S APPLICATIONS * Power source for digital home appliance * Power source for hand-held communication equipment, cameras, video instruments such as VCRs, camcorders. * Power source for battery-powered equipment. * Battery Charger Block Diagram 1 Ver A B C D E F G H 2 fosc Adjustable Adjustable 330kHz 330kHz 500kHz 500kHz 1000kHz 1000kHz Short Protection Latch Fold back Latch Fold back Latch Fold back Latch Fold back R1242S Selection Guide In the R1242 Series, short-circuit protection functions and frequency types can be selected from the followings; Short-circuit protection functions: Latch or Fold back; Frequency types: Adjustable or Fixed. Fixed frequencies are selectable from 330kHz, 500kHz, or 1000kHz. Product Name R1242S001-E2-FE Package Quantity per Reel Pb Free Halogen Free HSOP-8E 1,000 pcs Yes Yes : Latch or Fold back, frequency can be selected at the user's request Code A B C D E F G H Frequency Adjustable Adjustable 330kHz 330kHz 500kHz 500kHz 1000kHz 1000kHz Latch Type protection Yes No Yes No Yes No Yes No Fold back Type protection No Yes No Yes No Yes No Yes 3 R1242S PIN CONFIGURATIONS HSOP-8E TOP VIEW 1 8 2 7 R1242 3 6 4 5 PIN DESCRIPTIONS * R1242S001A/B PIN No. 1 2 3 4 5 6 7 8 Symbol CE EXT BST VIN LX GND FB RT Description Chip Enable Pin (Active with "H") Gete Drive Pin Bootstrap Pin Power Supply Pin LX Switching Pin Ground Pin Feedback Pin Frequency Setting Pin Tab is GND level. (They are connected to the reverse side of this IC.) The tab must be connected to the GND. * R1242S001C/D/E/F/G/H PIN No. 1 2 3 4 5 6 7 8 Symbol CE EXT BST VIN LX GND FB TEST Description Chip Enable Pin (Active with "H") Gate Drive Pin Bootstrap Pin Power Supply Pin LX Switching Pin Ground Pin Feedback Pin TEST Pin. OPEN or connect to GND Tab is GND level. (They are connected to the reverse side of this IC.) The tab must be connected to the GND. 4 R1242S Absolute Maximum Ratings (GND=0V) Symbol Item Rating Unit -0.3 ~ 32 V VLX - 0.3 ~ VLX + 6 V VIN Input Voltage VBST Boost Pin Voltage VLX LX Pin Voltage -0.3 ~ VIN + 0.3 V VCE CE Pin Input Voltage -0.3 ~ VIN + 0.3 V VFB VFB Pin Voltage -0.3 ~ 6 V VEXT EXT Pin Voltage -0.3 ~ 6 V VRT RT Pin Voltage -0.3 ~ 6 V 2.9 W PD Power Dissipation (HSOP-8E) Ta Operating Temperature Range -40 ~ 85 C Storage Temperature Range -55 ~ 125 C Tstg ) 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. 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. 5 R1242S Electrical Characteristics (Otherwise notified in Conditions, VIN= 12V, Ta=25C) Symbol Item Conditions MIN. Unit 30 V 1.20 mA VUVLO2 -0.3 V Operating Input Voltage IIN VIN Consumption Current VIN=30V, VFB=1.0V VUVLO1 UVLO Detect Voltage Falling VUVLO2 -0.5 VUVLO2 UVLO Released Voltage Rising 3.7 4.0 4.3 V 0.788 0.800 0.812 V VFB/Ta VFB Voltage Tolerance 0.45 Maxduty ppm/ C RT=GND 900 1000 1100 kHz RT=floating 290 330 375 kHz RT=120k 450 500 550 kHz Oscillator Frequency (Ver. C/D) 300 330 370 kHz Oscillator Frequency (Ver. E/F) 450 500 550 kHz Oscillator Frequency (Ver. G/H) 900 1000 1100 250 kHz kHz VFB <0.56 (Ver. D) 83 kHz VFB <0.56 (Ver. F) 125 kHz VFB <0.56 (Ver. H) 250 kHz VFB<0.56,RT=GND (Ver. B) VFLB 0.80 100 VFB Voltage Temperature Coefficient -40C Ta 85C Oscillator Frequency (Ver. A/B) fosc 5.0 MAX. VIN VFB Fold back Frequency Max. Duty Cycle tstart Soft Start Time tDLY Delay Time for Latch Protection RLXH LX High Side Switch ON Resistance ILXHOFF LX High Side Switch Leakage Current ILIMLXH LX High Side Switch Limited Current VCEH CE "H" Input Voltage VCEL CE "L" Input Voltage RT=120k (Ver. A/B) VIN=9V (Ver. C/D) 82 (Ver. A/C/E/G) 88 95 % 0.5 ms 5 ms 0.1 0 20 4.5 A A 1.7 V 0.4 V IFB VFB Input Current -1.0 1.0 A ICEH CE "H" Input Current -1.0 1.0 A ICEL CE "L" Input Current -1.0 1.0 A TTSD Thermal Shutdown Detect Temperature Hysteresis 30C 160 Standby Current VIN=30V, VCE=0V 0 RRISE EXT "H" Switch On Resistance IEXT=-100mA RFALL EXT "L" Switch On Resistance IEXT=100mA Istandby VEXTLIM 6 TYP. Detecting Voltage for Low Side Switch Current Limit C 20 A 6 11 0.5 1.5 76 mV 36 55 R1242S Typical application R1242S001A/B VOUT=1.8V 330kHz Rspd 15 Cspd R1 20k 220pF R2 16k VIN BST VIN CIN 10F Cbst L 0.1F 330kHz (Rt=Floating) FB Lx RT EXT 5.1k VOUT 1.8V COUT 22F x 2 FET CE GND 4.7H "H"active (recommendation) R1242S001C/D VOUT=1.2V 330kHz Rspd 15 Cspd 220pF VIN R1 8k BST VIN CIN 10F Cbst L 0.1F 4.7F Lx FB COUT R2 16k TEST EXT CE GND GND Recommendation parts CIN COUT Cbst L FET VOUT 1.2V FET 22F x 2 "H"active 5.1k (recommendation) 10F KTS500B106M55N0T00 (Nippon Chemi-Con) 22F GRM31CR71A226M (Murata) 0.1F GRM21BB11H104KA01L (Murata) 4.7H VLF10045T-4R7N6R1 (TDK) TPC8031 (TOSHIBA) 7 R1242S R1242S001A/B VOUT=1.2V 500kHz Rspd 15 Cspd 470pF VIN R1 BST VIN CIN 10F 8k Cbst 0.1F Rbst 15 FB L 2.2H 2.2uH LX VOUT 1.2V COUT R2 16k 500kHz EXT RT 22F x 2 FET (Rt=120k) CE GND "H"active 5.1k (recommendation) R1242S001E/F VOUT=1.2V 500kHz Rspd 15 Cspd 470pF VIN R1 8k VIN BST Cbst 0.1F CIN 10F Rbst 15 L 2.2H Lx FB 1.2V R2 16k EXT TEST CE GND Recommendation parts CIN COUT Cbst L FET 8 VOUT FET 5.1k "H"active (recommendation) 10F KTS500B106M55N0T00 (Nippon Chemi-Con) 22F GRM31CR71A226M (Murata) 0.1F GRM21BB11H104KA01L (Murata) 2.2H RLF7030T-2R2M5R4 (TDK) TPC8031 (TOSHIBA) COUT 22F x 2 R1242S R1242S001A/B VOUT=3.3V 1000kHz VIN Cspd 100pF R1 BST VIN CIN 10F 50k Cbst 0.1F L 4.7H Lx FB VOUT 3.3V COUT R2 16k 1000kHz (Rt=GND) RT EXT CE GND 10F FET 5.1k "H"active (recommendation) R1242S001G/H VOUT=3.3V 1000kHz Rspd 15 Cspd 100pF VIN R1 50k BST VIN CIN 10F Cbst 0.1F FB L 4.7H Lx 3.3V COUT R2 16k TEST EXT CE GND GND Recommendation parts CIN COUT Cbst L FET VOUT FET 10F "H"active (recommendation) 5.1k 10F KTS500B106M55N0T00 (Nippon Chemi-Con) 10F GRM31CR71E106K (Murata) 0.1F GRM21BB11H104KA01L (Murata) 4.7H VLF10045T-4R7N6R1 (TDK) SSM3K14T (TOSHIBA) 9 R1242S Notes Concerning to External Parts External components must be connected as close as possible to the ICs and their wiring must be short as possible. Especially, the capacitor must be connected with the shortest distance between VIN and GND pins. If the impedances of the power supply line and the GND line are high, the operation can be unstable due to the switching current which fluctuates the electric potential of the inside the ICs. The impedances of power supply line and GND line must be as low as possible. When designing their wirings, it is necessary to give careful consideration to the large current flowing into the power supply, GND, Lx, VOUT and inductor. The wiring of output voltage setting resistance (R1) and the wiring of inductor must be separated from load wiring. The ceramic capacitors with low ESR (Equivalent Series Resistance) must be used for the ICs. The recommended value for the CIN capacitor between VIN and GND is equal or more than 10F. The selections of inductor (L) and output capacitor (COUT) can be different according to the ICs' oscillation frequencies, output voltages and input voltages. Refer to "Recommended Value for Each Output Voltage" on the next page and select the most suitable values at the conditions of use. The internal phase compensation is built in the ICs; therefore, if the values selected are largely deviated from the recommended values, the operation may result in unstable. The over current protection circuit could be influenced by self-heating of the ICs and heat dissipation of the PCB environment. In order to prevent self-turning on, FET with smaller gate resistance and with smaller Cgd / Cgs (capacities between gate drains and the capacities between gate sources) should be selected. The output voltage (VOUT) can be calculated as VOUT = VFB x (R1+R2)/R2. The various voltage settings are possible by changing the values of R1 and R2. However, R2 value must be equal or less than 16k. Rspd prevents the deterioration in the regulation characteristics, which is caused by spike noise occurred in VOUT. Spike noise is largely depending on the PCB layout. If the PCB board layout is optimized, there is no need of Rspd; however, if the spike noise is a concern, Rspd with 15 or so should be used. After the completion of soft start, latch function (for versions A, C, E, and G) starts to work. The internal counter starts counting up when the over current protection circuit activates the limited current detection. When the internal counter counts up to 5ms, which is typical latch timer period, latch function turns off the output. The turned off output can be reset when CE pin is changed to "L", and also VIN pin voltage is became less than 3.6V (Typ.), which is UVLO detecting voltage. If the output voltage increases more than the setting voltage (FB pin voltage is 0.8V (Typ.)) within the latch timer period, the counter restores the default. If the power-supply voltage's start-up is slow and the output voltage is not reached to the setting voltage within the latch timer period after the soft start, the careful attention is required. After the soft start, fold back function (for Version B, D, F, and H) starts to work. The fold back function limits the oscillation frequencies into 1/4 when (FB pin voltage decreases to less than 0.56V (Typ.)). If the power-supply voltage's start-up is slow and the output voltage is not reached to the 70% of the setting voltage even for a short period of time after the soft start, the careful attention is required. The ICs are not supporting Nonsynchronous rectification using a diode as a rectifier. The table on the next page shows the recommended values for setting frequency and setting output voltage. 10 R1242S R1242Recommended Value for Each Output Voltage 330kHz VOUT[V] 0.8 VIN_range[V] 5~14 L[H] 2.2 COUT[F] 100 Cspd[pF] R1[] R2[] - 1.2 ~12 10 22 470 8000 16000 1.2 9~30 4.7 44 470 8000 16000 1.5 5~10 10 22 220 14000 16000 1.5 10~30 4.7 44 220 14000 16000 1.8 5~15 15 22 470 20000 16000 1.8 12~30 4.7 44 220 20000 16000 2.5 5~15 15 22 220 34000 16000 2.5 12~30 10 22 220 34000 16000 3.3 5~30 15 22 220 50000 16000 500kHz VOUT[V] 0.8 VIN_range[V] ~9 L[H] 2.2 COUT[F] 100 Cspd[pF] R1[] R2[] - 1.0 ~10 2.2 44 1000 4000 16000 1.2 5~15 2.2 44 470 8000 16000 1.5 5~18 4.7 44 220 14000 16000 1.5 7~19 2.2 44 220 14000 16000 1.8 5~23 4.7 44 220 20000 16000 1.8 9~21 2.2 44 220 20000 16000 2.5 5~29 10 22 220 34000 16000 3.3 5~30 10 22 220 50000 16000 5 9 7~30 15~30 10 10 22 22 220 220 84000 164000 16000 16000 1000kHz VOUT[V] VIN_range[V] L[H] COUT[F] Cspd[pF] R1[] R2[] - 1.2 5~10 2.2 22 220 8000 16000 1.5 5~15 2.2 22 100 14000 16000 1.8 5~15 4.7 22 220 20000 16000 2.5 5~19 4.7 22 220 34000 16000 3.3 5~30 4.7 10 100 50000 16000 0.8 5~7 1.5 100 5 7~12 4.7 10 100 84000 16000 5 12~30 4.7 10 56 84000 16000 9 15~30 4.7 10 56 164000 16000 5 9 15 7~30 15~30 20~30 15 15 15 22 22 22 220 220 220->100 84000 164000 284000 16000 16000 16000 12 18~30 15 22 470 28000 2000 15 20~30 15 22 220 284000 16000 15 20~30 10 10 100 284000 16000 11 R1242S R1242Recommendation parts Symbol Condition CIN COUT 10F/50V 10F/50V 10F/10V VOUT>10V 10V>VOUT>1.8V VOUT<1.8V Cbst L 12 Value Parts Name UMK325BJ106MM-T KTS500B106M55N0T00 GRM31CR71A106K KTS500B106M55N0T00 GRM31CR71E106K GRM31CR71A226M (at the diode rectifier, the specified condition only) 0.1F/50V GRM21BB11H104KA01L 10F/50V 10F/25V 22F/10V MFR TAIYO YUDEN Nippon Chemi-Con muRata Nippon Chemi-Con muRata muRata muRata 1.5H30%/4.0A 1.5H SLF7055T-3PF-1R5N4R0 TDK 2.2H20%/5.4A 4.7H30%/6.1A 10H20%6.2A 15H20%5.0A 2.2H 4.7H 10H 15H RLF7030T-2R2M5R4 VLF10045T-4R7N6R1 VLF12060T-100M6R2 VLF12060T-150M5R0 TDK TDK TDK TDK FET 30V/4A 30V/13A 30V/11A 30V/11A 57m 14.3m 9.8m 10.1m SSM3K14T TPCC8003-H TPCP8005-H TPC8031-H TOSHIBA TOSHIBA TOSHIBA TOSHIBA RCE Up Diode is connected between CE pin and VIN pin as an ESD protection element. If there is a possibility that the CE pin voltage becomes higher than the VIN pin voltage, it is recommended to insert a 5k resistance or more in order to prevent the large current flowing from CE pin into VIN pin. R1242S Technical Notes on the voltage between BST pin and LX pin In the application of the "Bootstrap" Start switching regulator, the R1242 series, when the LX pin voltage becomes equal or less than the BST voltage supply regulator, the BST voltage supply regulator charges the capacitor, Cbst. By this function, even if the LX pin becomes "H", the high side switch composed of an Nch transistor can be turned on. Under the condition of PWM operation, the BST voltage supply regulator of the R1242, while the LX pin voltage is "L", the voltage between BST pin and GND pin is controlled and maintained the level as of 5V, then regardless of the voltage drop by the bootstrap switch, the BST voltage supply regulator can drive a high side switch and the low side external MOSFET. However, if either the maximum duty cycle limit or the low side switch current limit is detected, sampling of the voltage between BST pin and LX pin is halted, and the output of the BST voltage supply regulator becomes stacked at 5V as same as a conventional "Bootstrap" Start switching regulator. Depending on the external FET gate capacitance, excessive voltage drop can be caused by bootstrap switching, and also switching failure can be caused by insufficient electrical charge on Cbst. As a result, the desired voltage may not be obtained. Higher frequency requires higher electrical charge. Special attention is required in case of using the device at 1000 kHz. Events that may trigger such trouble are (A) Detect of the current limit of low side switch at light load (B) VOUT>VIN/2 and starting the circuit without using CE pin individually or CE pin and VIN are tied and controlled at the same time. (C) The voltage difference between the input and the output is small and usage at maximum duty cycle is expected. The countermeasure to avoid the trouble caused by the events above is to use an external diode, Dbst shown in the figure below. The Dbst will charge CBST and prevents the abnormal switching. The supply voltage to Dbst should be in the range from 4.5V to 6.0V and if the set output voltage of the R1242 is in the range from 4.5V to 6.0V, then the output voltage can be used directly as the supply voltage of Dbst. The voltage rating of the diode, Dbst must be VIN or more, the forward current of Dbst must be 20mA or more. Other specifications of the Dbst are not important. Application Circuit example Cspd BST R1 ( )Dbst *if necessary Cbst FB Lx RT EXT L R2 1000kHz (Rt=GND) CE GND FET "H"active (recommendation) 13 R1242S Operating Frequency In the application circuit of the R1242S001A/B, the 330kHz operation is selected by leaving Rt open. Connecting a 200k to 0 resistor between Rt(pin 8) and ground can be used to set the switching frequency to approximately 450kHz to 1000kHz. To calculate the Rt resistor, use the equation below: *(Between 330kHz and 450kHz switching frequency can be also set by connecting the appropriate resistor according to the next equation.) Rt=120000/(2/(1000000/fosc-1)-1) [] The switching frequency vs. Rt value is shown in Figure 1 and Figure 2. Figure 1: Linearscale Figure 2: Logscale 14 R1242S 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> ILmax IL ILmin i1 VIN Hiside Tr Lowside FET VOU T L i2 Iconst COUT ton GND t toff T=1/fosc Step1. Hiside Tr. Turns on and current IL (=i1) flows, and energy is charged into COUT. At this moment, IL increases from ILmin to reach ILmax in proportion to the on-time period (ton) of Hiside Tr. Step2. When Hiside Tr. Turns off, Synchronous rectifier Lowside FET turns on in order that L maintains IL at ILmax, and current IL (=i2) flows. Step3. IL decreases from ILmax to reach ILmin in proportion to the off-time period (toff) of Hiside Tr. 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 Hiside Tr. Turns on and off. 15 R1242S Output Current and selection of External components The relation between the output current and external components is as follows: When Hiside Tr. Of LX is ON: (Wherein, Ripple Current p-p value is described as IRP, ON resistance of Hiside Tr. And Lowside FET of LX are respectively described as RONH and RONL, and the DC resistor of the inductor is described as RL.) VIN = VOUT + (RONH + RL) x IOUT + L x IRP / ton .................................................................Equation 1 When Hiside Tr. Of Lx is "OFF" (Lowside FET is "ON"): L x IRP / toff = RONL x IOUT + VOUT + RL x IOUT .................................................................Equation 2 Put Equation 2 to Equation 1 and solve for ON duty of Hiside Tr., DON = ton / (toff + ton), DON = (VOUT + (RONL + RL) x IOUT)/( VIN + (RONL - RONH) x IOUT) .......................................Equation 3 Ripple Current is as follows: IRP = (VIN - VOUT - RONH x IOUT - RL x IOUT) x DON / fosc / L..............................................Equation 4 wherein, peak current that flows through inductor, Hiside Tr, and Lowside FET is as follows: ILmax = IOUT + IRP / 2 ......................................................................................................Equation 5 Consider ILmax, condition of input and output and select external components. The above explanation is directed to the calculation in an ideal case in continuous mode. 16 R1242S TYPICAL CHARACTERISTICS 2)Oscillator Frequency(ver.A,B Rt=floating) (VIN=12V) 0.808 0.806 0.804 0.802 0.800 0.798 0.796 0.794 0.792 (VIN=12V) 390 370 fosc(kHz) VFB(V) 1)FB Voltage 350 330 310 290 270 -40 -15 10 35 60 -40 85 -15 3)Oscillator Frequency(ver.A,B Rt=GND) 85 (VIN=12V) (VIN=12V) 1200 1150 1100 1050 1000 950 900 850 800 60 4)Oscillator Frequency(ver.A,B Rt=120k) 600 fosc(kHz) fosc(kHz) 35 Ta(C) Ta(C) 550 500 450 400 -40 -15 10 35 60 -40 85 -15 10 35 5)Oscillator Frequency(ver.C,D) 6) 85 Oscillator Frequency(ver.E,F) (VIN=12V) 390 60 Ta(C) Ta(C) (VIN=12V) 600 370 350 fosc(kHz) fosc(kHz) 10 330 310 290 270 550 500 450 400 -40 -15 10 35 Ta(C) 60 85 -40 -15 10 35 60 85 Ta(C) 17 R1242S Oscillator Frequency(ver.G,H) 8) Fold-Back Frequency(ver.A,B Rt=GND) (VIN=12V) 1200 1150 1100 1050 1000 950 900 850 800 300 250 200 150 -40 -15 10 35 Ta(C) 60 85 9) Fold-Back Frequency(ver.C,D) -40 -15 10 35 60 -40 85 12) (VIN=12V) -15 10 35 60 85 Maxduty(ver.A,B Rt=floating) (VIN=12V) 100.0 95.0 300 Maxduty(%) fFLD(kHz) 85 Ta(C) 11) Fold-Back Frequency(ver.G,H) 250 200 90.0 85.0 -4 80.0 -4 -4 75.0 150 -40 -15 10 35 Ta(C) 18 60 (VIN=12V) Ta(C) 350 10 35 Ta(C) 160 150 140 130 120 110 100 90 80 fFLD(kHz) 115 105 95 85 75 65 55 45 -40 -15 10) Fold-Back Frequency(ver.E,F) (VIN=12V) fFLD(kHz) (VIN=12V) 350 fFLD(kHz) fosc(kHz) 7) 60 85 70.0 -40 -15 10 35 Ta(C) 60 85 R1242S 13) Maxduty(ver.C,D) 14) (VIN=12V) 100.0 (VIN=12V) 100.0 95.0 Maxduty(%) 95.0 Maxduty(%) Maxduty(ver.G,H) 90.0 85.0 80.0 90.0 85.0 80.0 75.0 75.0 70.0 70.0 -40 -15 10 35 60 -40 85 -15 Maxduty(ver.A,B Rt=GND) 16) (Ta=25) 100.0 Maxduty(%) Maxduty(%) 90.0 85.0 80.0 50.0 25 30 5 10 15 20 25 30 VIN [V] VIN [V] 17) 70.0 70.0 20 (Ta=25) 80.0 60.0 15 85 90.0 75.0 10 60 Maxduty(ver.C,D) 100.0 95.0 5 35 Ta(C) Ta(C) 15) 10 Maxduty(ver.G,H) (Ta=25) 100.0 Maxduty(%) 95.0 90.0 85.0 80.0 75.0 70.0 5 10 15 20 25 30 VIN [V] 19 R1242S 18)Efficiency vs Load Current fosc=330kHz VOUT:0.8V VOUT:3.3V (Ta=25) 80 60 Vin= 5V V =5V IN 40 VIN=9V Vin= 9V 20 VIN=12V Vin= 12 V (Ta=25) 100 Efficiency[%] Efficiency [%] 100 80 Vin= 5V VIN=5V Vin= 9V VIN=9V Vin= 12 V VIN=12V Vin= 24 V VIN=24V Vin= 30 V VIN=30V 60 40 20 0 0 1 10 100 IOUT [mA] 1000 10000 1 10 100 IOUT [mA] 1000 10000 VOUT:15V (Ta=25) Efficiency [%] 100 80 60 40 V Vin= 24 V IN=24V V Vin= 30 V IN=30V 20 0 1 10 100 1000 10000 IOUT [mA] fosc=500kHz VOUT:0.8V VOUT:3.3V (Ta=25) 80 60 40 Vin= 5V VIN=5V Vin= 9V VIN=9V 20 0 80 Vin= 5V VIN=5V Vin= 9V VIN=9V Vin= 12 V VIN=12V VIN=24V Vin= 24 V VIN=30V Vin= 30 V 60 40 20 0 1 20 (Ta=25) 100 Efficiency [%] Efficiency [%] 100 10 100 IOUT [mA] 1000 10000 1 10 100 IOUT [mA] 1000 10000 R1242S VOUT:15V (Ta=25) Efficiency [%] 100 80 60 40 Vin= 24 V VIN=24 VIN=30 Vin= 30 V V 20 0 1 10 100 IOUT[mA] 1000 10000 fosc=1000kHz VOUT:0.8V VOUT:3.3V (Ta=25) (Ta=25) 5 VVin= IN=5V V 80 100 Efficiency [%] Efficiency [%] 100 60 40 20 80 60 Vin= 5V VIN=5V Vin= 9V VIN=9V VIN=12V Vin= 12 V 40 20 0 0 1 10 100 IOUT [mA] 1000 10000 1 10 100 1000 10000 IOUT [mA] VOUT:15V (Ta=25) 100 Efficiency [%] 80 60 40 VIN=24V Vin=24V VIN=30V Vin=30V 20 0 1 10 100 IOUT [mA] 1000 10000 21 R1242S 19)Load Regulation fosc=330kHz VOUT:0.8V VOUT:3.3V (Ta=25) VIN=5V Vin= 5V Vin= 9V VIN=9V Vin= 12 V VIN=12V Vin= 24 V VIN=24V Vin= 30 V VIN=30V 0.85 0.84 0.83 0.82 0.81 0.8 0.79 0.78 0.77 0.76 0.75 VOUT[V] Vin= 5V VIN=5V Vin= 9V VIN=9V Vin= 12 V VIN=12V 0 VOUT[V] (Ta=25) 3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 0 500 1000 1500 2000 2500 3000 500 IOUT[mA] 1000 1500 2000 2500 3000 IOUT[mA] VOUT[V] VOUT:15V (Ta=25) 16 15.8 15.6 15.4 15.2 15 14.8 14.6 14.4 14.2 14 VIN=24V Vin= 24 V VIN=30V Vin= 30 V 0 500 1000 1500 2000 2500 3000 IOUT [mA] fosc=500kHz VOUT:0.8V VOUT:3.3V (Ta=25) 0.85 0.84 0.83 0.82 0.81 0.8 0.79 0.78 0.77 0.76 0.75 VOUT [V] VIN=5V Vin= 5V V =9V Vin= IN 9 V 0 500 1000 1500 2000 2500 3000 IOUT[mA] 22 VOUT [V] (Ta=25) 3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 V Vin= 5V IN=5V V Vin= 9V IN=9V V Vin= 12 V IN=12V V Vin= 24 V IN=24V V Vin= 30 V IN=30V 0 500 1000 1500 2000 IOUT [mA] 2500 3000 R1242S VOUT [V] VOUT:15V (Ta=25) 16 15.8 15.6 15.4 15.2 15 14.8 14.6 14.4 14.2 14 Vin= 24 V VIN=24V Vin= 30 V VIN=30V 0 500 1000 1500 2000 2500 3000 IOUT [mA] fosc=1000kHz VOUT:3.3V (Ta=25) 0.85 0.84 0.83 0.82 0.81 0.8 0.79 0.78 0.77 0.76 0.75 Vin= 5 V IN=5V V 0 500 1000 1500 2000 IOUT [mA] 2500 3000 VOUT[V] VOUT[V] VOUT:0.8V (Ta=25) 5V VVin= IN=5V VVin= 9V IN=9V VVin= 12 V IN=12V 3.6 3.5 3.4 3.3 3.2 3.1 3 2.9 2.8 0 500 1000 1500 2000 IOUT [mA] 2500 3000 VOUT [V] VOUT:15V (Ta=25) 16 15.8 15.6 15.4 15.2 15 14.8 14.6 14.4 14.2 14 V Vin=24V IN=24V V IN=30V Vin=30V 0 500 1000 1500 2000 2500 3000 IOUT [mA] 23 R1242S 20)Line Regulation fosc=330kHz VOUT:3.3V (Ta=25) 0.85 0.84 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 0.75 Iout=1mA IOUT=1mA Iout=100mA IOUT=100mA Iout=500mA IOUT=500mA Iout=1500mA IOUT=1500mA Iout=3000mA IOUT=3000mA 5 10 15 20 VIN(V) 25 VOUT [V] VOUT [V] VOUT:0.8V (Ta=25) 3.50 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 30 IOUT=1mA Iout=1mA IOUT=100mA Iout=100mA IOUT=500mA Iout=500mA IOUT=1500mA Iout=1500mA IOUT=3000mA Iout=3000mA 5 10 15 20 VIN(V) 25 30 VOUT [V] VOUT:15V (Ta=25) 16.0 15.8 15.6 15.4 15.2 15.0 14.8 14.6 14.4 14.2 14.0 Iout=1mA IOUT=1mA Iout=100mA IOUT=100mA Iout=500mA IOUT=500mA Iout=1500mA IOUT=1500mA Iout=3000mA IOUT=3000mA 20 25 VIN(V) 30 fosc=500kHz (Ta=25) 0.85 0.84 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 0.75 Iout=1mA IOUT=1mA Iout=100mA IOUT=100mA Iout=500mA IOUT=500mA Iout=1500mA IOUT=1500mA Iout=3000mA IOUT=3000mA 5 24 VOUT:3.3V 6 VIN(V) 7 8 (Ta=25) VOUT [V] VOUT [V] VOUT:0.8V 3.50 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 Iout=1mA IOUT=1mA Iout=100mA IOUT=100mA Iout=500mA IOUT=500mA IOUT=1500mA Iout=1500mA IOUT=3000mA Iout=3000mA 5 10 15 VIN(V) 20 25 30 R1242S VOUT [V] VOUT:15V (Ta=25) 16.0 15.8 15.6 15.4 15.2 15.0 14.8 14.6 14.4 14.2 14.0 Iout=1mA IOUT=1mA Iout=100mA IOUT=100mA Iout=500mA IOUT=500mA Iout=1500mA IOUT=1500mA Iout=3000mA IOUT=3000mA 20 25 VIN(V) 30 fosc=1000kHz VOUT:0.8V VOUT:3.3V (Ta=25) IIout=1mA OUT=1mA IIout=100mA OUT=100mA IIout=500mA OUT=500mA IIout=1500mA OUT=1500mA IIout=3000mA OUT=3000mA VOUT [V] 0.85 0.84 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 0.75 5 6 7 8 VIN [V] VOUT [V] (Ta=25) 3.50 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 IOUT=1mA Iout=1mA IOUT=100mA Iout=100mA IOUT=500mA Iout=500mA IOUT=1500mA Iout=1500mA IOUT=3000mA Iout=3000mA 5 10 15 20 25 30 VIN(V) VOUT:15V (Ta=25) VOUT [V] 16.0 15.8 15.6 15.4 15.2 15.0 14.8 14.6 14.4 14.2 14.0 Iout=1mA IOUT=1mA Iout=100mA IOUT=100mA Iout=500mA IOUT=500mA Iout=1500mA IOUT=1500mA Iout=2000mA IOUT=3000mA 20 25 VIN(V) 30 25 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. The products listed in this document are intended and designed for use as general electronic components in standard applications (office equipment, telecommunication equipment, measuring instruments, consumer electronic products, amusement equipment etc.). Those customers intending to use a product in an application requiring extreme quality and reliability, for example, in a highly specific application where the failure or misoperation of the product could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system, traffic control system, automotive and transportation equipment, combustion equipment, safety devices, life support system etc.) should first contact us. 6. We are making our continuous effort to improve the quality and reliability of our products, but semiconductor products are likely to fail with certain probability. In order to prevent any injury to persons or damages to property resulting from such failure, customers should be careful enough to incorporate safety measures in their design, such as redundancy feature, firecontainment feature and fail-safe feature. We do not assume any liability or responsibility for any loss or damage arising from misuse or inappropriate use of the products. 7. Anti-radiation design is not implemented in the products described in this document. 8. Please contact Ricoh sales representatives should you have any questions or comments concerning the products or the technical information. Halogen Free For the conservation of the global environment, Ricoh is advancing the decrease of the negative environmental impact material. After Apr. 1, 2006, we will ship out the lead free products only. Thus, all products that will be shipped from now on comply with RoHS Directive. Basically after Apr. 1, 2012, we will ship out the Power Management ICs of the Halogen Free products only. (Ricoh Halogen Free products are also Antimony Free.) RICOH COMPANY, LTD. Electronic Devices Company http://www.ricoh.com/LSI/ RICOH COMPANY, LTD. Electronic Devices Company Higashi-Shinagawa Office (International Sales) 3-32-3, Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-8655, Japan Phone: +81-3-5479-2857 Fax: +81-3-5479-0502 RICOH EUROPE (NETHERLANDS) B.V. Semiconductor Support Centre Nieuw Kronenburg Prof. W.H. Keesomlaan 1, 1183 DJ, Amstelveen, The Netherlands P.O.Box 114, 1180 AC Amstelveen Phone: +31-20-5474-309 Fax: +31-20-5474-791 RICOH ELECTRONIC DEVICES KOREA Co., Ltd. 11 floor, Haesung 1 building, 942, Daechidong, Gangnamgu, Seoul, Korea Phone: +82-2-2135-5700 Fax: +82-2-2135-5705 RICOH ELECTRONIC DEVICES SHANGHAI Co., Ltd. Room403, No.2 Building, 690#Bi Bo Road, Pu Dong New district, Shanghai 201203, People's Republic of China Phone: +86-21-5027-3200 Fax: +86-21-5027-3299 RICOH COMPANY, LTD. Electronic Devices Company Taipei office Room109, 10F-1, No.51, Hengyang Rd., Taipei City, Taiwan (R.O.C.) Phone: +886-2-2313-1621/1622 Fax: +886-2-2313-1623