R1211x Series PWM Step-up DC/DC Controller The R1211x Series are low supply current CMOS-based PWM step-up DC/DC controllers. R1211x does not include an internal output transistor. By simply using a power MOS, an inductor, a diode, resistors, and capacitors as external components, a high-efficiency step-up DC/DC converter can be easily configured. R1211x is available in two versions: B/D versions with an internal phase compensation and A/C versions with adjustable phase compensation with an external capacitor and resistor. The oscillator frequency can be selected from 300kHz or 700kHz. The soft start function built into the controller is set to Typ. 10.5ms for 300kHz and to Typ. 9ms for 700kHz. The latch type protection circuit embedded into the device latches the external driver in the "OFF" state when the oscillator maximum duty cycle continues for a predetermined period of time setting by an external capacitor. FEATURES * Supply Current (IDD1)*********************** Typ. 600A (700kHz, VFB=0V, EXT at no load), * * * * * * Oscillator Frequency (fosc)***************300kHz (C/D Versions) Typ. 300A (300kHz, VFB=0V, EXT at no load) Standby Current (Istandby) ***************** Max. 1A (In standby, only B/D Versions) Input Voltage Range (VIN) *************** 2.5V to 6.0V Output Voltage Range ******************** Externally adjustable (Feedback voltage : 1.0V) Feedback Voltage Accuracy *********** 1.5% Temp. coeff. of Feedback Voltage ***** 150ppm/C 700kHz (A/B Versions) * Oscillator Maximum Duty Cycle (Maxduty) **Typ. 90% * UVLO Detect Voltage (VUVLO) *********2.2V * Soft Start Time (tstart) ***********************Typ. 10.5ms (300kHz) Typ. 9ms (700kHz) * Packages****************************************SON-6, SOT-23-6W BLOCK DIAGRAMS R1211x002A/C R1211x002B/D (External phase compensation type) (Internal phase compensation type) OSC VFB AMPOUT Vref EXT DTC VIN + - + OSC VFB Vref GND DTC EXT + - + VIN GND UVLO UVLO + + Latch DELAY TYPICAL APPLICATIONS .$. : Select from (.A.) oscillator frequency of 700kHz, external phase compensation, (.B.) oscillator frequency of 700kHz, internal phase compensation with standby function, (.C.) oscillator frequency of 300kHz, external phase compensation or (.D.) oscillator frequency of 300kHz, internal phase compensation with standby function. R1211x002A/C R1211x002B/D SD VIN C1 C2 GND VFB SD VOUT NMOS C4 EXT DELAY C3 R3 C1 C2 R2 DELAY VFB GND C5 R4 VOUT NMOS C4 EXT VIN R1 AMPOUT R1 C3 R3 R2 CE CE Control NMOS : IRF7601, L : 10H (002A), 22H (002C), SD : CRS02, C1 : 4.7F, C2 : 0.22F, C3 : 10F, C4 :680pF, C5 : 2200pF, R3 : 30k, R4 : 30k PACKAGES (Top View) NMOS : IRF7601, L : 10H (002B), 22H (002D), SD : CRS02, C1 : 4.7F, C2 : 0.22F, C3 : 10F, C4 : 680pF, R3 : 30k TYPICAL CHARACTERISTIC SON-6 5 Chip Enable CE Package Q'ty per Reel Part No. SON-6 3,000 pcs R1211D002.$ -TR-FE SOT-23-6W 3,000 pcs R1211N002.$ -TR-FE 6 Latch LOAD Halogen Free - LOAD SELECTION GUIDES DELAY - - + + SOT-23-6W 4 6 5 R1211x002A Efficiency vs. Output Current 4 L=10H, VOUT=5V 100 1 1 2 3 4 5 6 2 1 3 DELAY GND EXT VIN VFB AMPOUT or CE 1 2 3 4 5 6 2 3 DELAY AMPOUT or CE VFB VIN GND EXT ) The tab suspension leads on back side are substrate level (GND). Efficiency (%) 80 60 40 20 0 VIN=2.5V VIN=3.3V 1 10 100 1000 Output Current IOUT (mA) APPLICATIONS * Power source for hand-held equipment No.EK-088-111001 * Power source for LCD and CCD * Power source for automotive application Step-up 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. 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