R1243x Series 2A 30V Input PWM Step-down DC/DC Converter The R1243x Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 2A output current. R1243x includes a soft start circuit and a latch or fold-back protection circuit. By simply using an inductor, resistors, a diode, and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode PWM control, the R1243x provides a fast response and high efficiency. Ceramic output capacitors can be used. FEATURES * Supply Current (IDD) ************************ Typ. 0.7mA (No switching) * Soft Start Time (tstart) *********************** Typ. 0.4ms ~ (Adjustable by an external capacitor) * Standby Current (Istandby) ***************** Max. 10A (CE="L") * Input Voltage Range (VIN) *************** 4.5V to 30.0V * High Side Switch Limit Current******* Typ. 3.8A * Output Voltage Range (VOUT)********** 0.8V to 18.0V (Externally adjustable) * Thermal Shutdown Circuit ************** Stops at 160C (Feedback voltage : 0.5V) * Latch Protection Circuit ****************** Delay time for protection Typ. 2ms (Ver. A/C) , 0.08ms (Ver. E) * Feedback Voltage Accuracy *********** 1.4% * Output Current (IOUT)*********************** 2A * Fold-back Protection Circuit *********** Fold-back frequency Typ. 250kHz (Ver. B) * Oscillator Frequency (fosc)*************** Select from 1MHz or 330kHz Typ. 82.5kHz (Ver. D) * Oscillator Maximum Duty Cycle (Maxduty) *** Min. 85%, Typ. 90% * UVLO Detect Voltage (VUVLO) ********* Typ. 3.8V * FLG pin (Nch. Open drain output)***** FLG "OFF" Delay Time Typ. 0.25ms * Packages**************************************** DFN(PLP)2527-10, HSOP-8E ) This is an approximate value, because output current depending on conditions and external parts. BLOCK DIAGRAM TYPICAL APPLICATION R1243x001C/D (VOUT=5.0V, Soft Start Time 12ms, Flag Function using) R1243x CSS 0.1F BST CBST 0.47F VIN 24.0V TSS VFLGIN 5.0V CE VIN CIN 10F RCE 47k LX "H"active RFLG 47k FLG FLAG VFB GND CSPD 220pF RUP 18k VOUT COUT 22F L10H RBOT 2.0k 5.0V CIN, COUT: Ceramic capacitors can be used. CBST: Bootstrap Capacitor CSS: Capacitor for setting soft start time 1) Latch / Fold-back Selectable SELECTION GUIDES Halogen Free .A. : 1MHz, Latch type (2ms) .B. : 1MHz, Fold-back type .C. : 330kHz, Latch type (2ms) .D. : 330kHz, Fold-back type E. : 1MHz, Latch type (0.08ms/ only HSOP-8E) Package Q'ty per Reel Part No. DFN(PLP)2527-10 5,000 pcs R1243K001. -TR HSOP-8E 1,000 pcs R1243S001. -E2-FE . : Specify a combination of the oscillator frequency and the protection circuit. PACKAGES TYPICAL CHARACTERISTICS DFN(PLP)2527-10 8 7 6 6 7 8 8 7 6 Bottom View 5 5 6 7 1 1 2 3 4 5 2 3 4 5 Lx Lx GND VFB FLG 5 6 7 8 9 10 4 3 8 9 10 2 1 CE TSS BST VIN VIN 1 1 2 3 4 2 3 BST VIN Lx GND 4 4 5 6 7 8 3 2 1 VFB FLG CE TSS 100 90 80 70 60 50 40 30 20 10 0 VOUT=3.3V, Topt=25C Efficiency (%) 10 9 Efficiency vs. Output Current R1243x001A/B, R1243S001E R1243x001C/D HSOP-8E Top View Bottom View Efficiency (%) Top View VIN=5.0V VIN=12.0V 1 ) The tab is substrate level (GND), must be connected to GND level. ) The FLG pin connected to the GND level or should be open when FLG is not used. 10 100 1000 Output Current IOUT (mA) 10000 100 90 80 70 60 50 40 30 20 10 0 VOUT=3.3V, Topt=25C VIN=5.0V VIN=12.0V VIN=24.0V 1 10 100 1000 Output Current IOUT (mA) 10000 APPLICATIONS * Power source for digital home appliances such as digital TVs and DVD players * Power source for hand-held communication equipment, cameras, and VCRs * Power source for office automation equipment such as printers and fax machines * Power source for battery-powered equipment No.EK-206-130716 Step-down DC/DC Converter 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. 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