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| Preliminary RT9261/A VFM Step-Up DC/DC Converter General Description The RT9261 Series are VFM Step-up DC/DC ICs with ultra low supply current by CMOS process and suitable for use with battery-powered instruments. The RT9261 IC consists of an oscillator, a VFM control circuit, a driver transistor (LX switch), a reference voltage unit, an error amplifier, resistors for voltage detection, and a LX switch protection circuit. A low ripple and high efficiency step-up DC/DC converter can be constructed of this RT9261 IC with only three external components. The RT9261A IC provides with a drive pin (EXT) for an external transistor, so that a power transistor can be externally applied. Therefore, the RT9261A IC is recommended for applications where large currents are required. EN pin enables circuit to set the standby supply current at a maximum of 0.5A. Features Minimal Number of External Components ( Only an Inductor, a Diode, and a Capacitor) Ultra Low Input Current ( 5A at Switch Off) 2% High Output Voltage Accuracy Low Ripple and Low Noise Low Start-up Voltage, 0.85V at 1mA 75% Efficiency with Low Cost Inductor +50 ppm/ C Low Temperature-Drift SOT-89 and SOT-23-5 Small Packages RoHS Compliant and 100% Lead (Pb)-Free Applications Power source for battery-powered equipment Power source for cameras, camcorders, VCRs, PDAs, pagers, electronic data banks, and hand-held communication equipment Power source for applications, which require higher voltage than that of batteries used in the appliances Ordering Information RT9261/APackage Type B : SOT-23-5 X : SOT-89 Marking Information For marking information, contact our sales representative Operating Temperature Range directly or through a RichTek distributor located in your P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- area, otherwise visit our website for detail. cial Standard) Output Voltage Pin Configurations 15 : 1.5V 16 : 1.6V : (TOP VIEW) 49 : 4.9V 50 : 5.0V Use external switch Use internal switch 1 2 3 Note : RichTek Pb-free and Green products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 100% matte tin (Sn) plating. 1 2 3 GND VOUT LX (TAB) GND VOUT EXT (TAB) RT9261- CX SOT-89 RT9261A- CX DS9261/A-12 March 2007 www.richtek.com 1 RT9261/A EN VOUT NC 1 2 3 4 5 Preliminary LX EN VOUT 1 2 3 5 EXT GND NC 4 GND RT9261- CB SOT-23-5 RT9261A- CB Typical Application Circuit D1 1N5819 L1 100uH VIN RT9261CX LX VOUT GND VOUT + COUT 22uF Figure 1 L1 27uH Cb 0.01uF VIN ZTX 650 D1 1N5819 RT9261ACX EXT VOUT GND VOUT + Tr Rb 300 COUT 22uF Figure 2 D1 1N5819 L1 100uH VIN NC EN GND RT9261CB LX VOUT VOUT COUT 22uF + Figure 3 www.richtek.com 2 DS9261/A-12 March 2007 Preliminary RT9261/A L1 27uH NC VIN ZTX 650 Cb 0.01uF D1 1N5819 RT9261ACB VOUT EXT Tr Rb 300 EN GND VOUT COUT 22uF + Figure 4 D1 1N5819 L1 27uH VIN NC Chip Enable EN GND RT9261CB LX VOUT VOUT COUT 22uF + Figure 5 DS9261/A-12 March 2007 www.richtek.com 3 RT9261/A Functional Pin Description Pin No. -xxCX 1 2 3 ---A-xxCX 1 2 -3 ---xxCB 4 2 5 -1 3 A-xxCB 4 2 -5 1 3 GND VOUT LX EXT EN NC Preliminary Pin Name Pin Function Ground Output Voltage Pin for Switching Drive External Device Chip Enable (Active High) No Connected Function Block Diagram LX LXSW VLX Limiter VREF Buffer VOUT + Error Amplifier GND VFM Control EXT OSC 100kHz Chip Enable EN Notes: (1) LX Pin...... (2) EXT Pin.... (3) EN Pin...... only for 9261only for 9261Aonly for 9261CX and 9261CX and 9261ACB and 9261ACB CB CB www.richtek.com 4 DS9261/A-12 March 2007 Preliminary Absolute Maximum Ratings RT9261/A 8V 8V - 0.3 to VOUT +0.3V - 0.3 to VOUT +0.3V 250mA 50mA 0.5W 0.25W 100 C/W 300 C/W 250 C/W - 20 to +85C 165C 260C Output Voltage -------------------------------------------------------------------------------------------------------LX Pin Voltage (1) -----------------------------------------------------------------------------------EXT Pin Voltage (2) --------------------------------------------------------------------------------------------------EN Pin Voltage (3) ---------------------------------------------------------------------------------------------------LX Pin Output Current (1) -------------------------------------------------------------------------------------------EXT Pin Current (2) --------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25C SOT-89 -----------------------------------------------------------------------------------------------------------------SOT-23-5 --------------------------------------------------------------------------------------------------------------Package Thermal Resistance SOT-89, JC -----------------------------------------------------------------------------------------------------------SOT-89, JA -----------------------------------------------------------------------------------------------------------SOT-23-5, JA ---------------------------------------------------------------------------------------------------------Operating Temperature Range ------------------------------------------------------------------------------------Storage Temperature Range --------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------Notes: (1) Applicable to RT9261CX and RT9261CB (2) Applicable to RT9261ACX and RT9261ACB (3) Applicable to RT9261CB and RT9261ACB Electrical Characteristics Parameter Output Voltage Accuracy Input Voltage Start-up Voltage Hold-on Voltage Input Current 1 Input Current 2 LX Switching Current LX Leakage Current Maximum Oscillator Oscillator Duty Cycle Efficiency VLX Voltage Limit Notes: (Refer to Figure 1) Symbol VOUT VIN VST VHO IOUT = 1mA, VIN: 0 2V IOUT = 1mA, VIN: 2 0V To be measured at VIN at no load To be measured at VOUT in switch off condition Test Conditions Min -2 --0.7 ---60 (2) Typ --0.85 -15 18 5 ---120 75 75 0.8 Max Units +2 7 1.0 -18 24 8 --0.5 160 85 -1.0 A kHz % % V % V V V A A mA VOUT 3.5V (1) (2) 3.5V < VOUT 5V VOUT 3.5V (1) 3.5V < VOUT 5V ISWITCHING ILEAKAGE FMAX DOSC VLX = 0.4V VLX = 6V 80 -80 On ( VLX " L " ) side 65 -- LX switch on 0.65 (1)Unless otherwise provided, VIN = 1.8V, VSS = 0V, IOUT = 10mA, TOPT = 25C, and External Circuit of Typical Application (2)Unless otherwise provided, VIN = 3V, VSS = 0V, IOUT = 10mA, TOPT = 25 C, and External Circuit of Typical Application DS9261/A-12 March 2007 www.richtek.com 5 RT9261/A Electrical Characteristics Parameter Output Voltage Accuracy Input Voltage Start-up Voltage Input Current 1 VOUT 3.5V VOUT 3.5V VOUT 3.5V VOUT 3.5V (1) (2) Preliminary (Refer to Figure 2) Symbol VOUT VIN VST 3.5V < VOUT 5V (1) (2) Test Conditions Min -2 -- Typ --0.85 30 60 6 ----120 75 Max Units +2 7 1.0 50 90 10 ----160 85 kHz % mA % V V A A IOUT = 1mA, VIN : 0 2V To be measured at VIN at no load To be measured at VOUT in switch off condition VEXT = VOUT - 0.4V -----1.5 Input Current 2 EXT "H" Output Current EXT "L" Output Current 3.5V < VOUT 5V (1) 3.5V < VOUT 5V (1) (2) mA -2 1.5 3.5V < VOUT 5V (2) VEXT = 0.4V FMAX DOSC VEXT " H " side 2 80 65 Maximum Oscillator Frequency Oscillator Duty Cycle Notes: (1)Unless otherwise provided, VIN = 1.8V, VSS = 0V, IOUT = 10mA, TOPT = 25 C, and use External Circuit of Typical Application (2)Unless otherwise provided, VIN = 3V, VSS= 0V, IOUT = 10mA, TOPT = 25 C, and External Circuit of Typical Application www.richtek.com 6 DS9261/A-12 March 2007 Preliminary Electrical Characteristics Parameter Output Voltage Accuracy Input Voltage Start-up Voltage Hold-on Voltage Efficiency VOUT 3.5V VOUT 3.5V VOUT 3.5V VOUT 3.5V (1) (2) RT9261/A Min -2 -Typ --0.85 -75 85 15 18 5 6 -------120 75 0.8 Max +2 7 1.0 ---18 24 8 10 --0.5 -0.2 0.5 -160 85 1.0 A V V A A kHz % V A A % V V V % (Refer to Figure 3) Symbol VOUT VIN VST VHO IOUT = 1mA, VIN : 0 2V IOUT = 1mA, VIN : 2 0V Test Conditions -0.7 --- 3.5V < VOUT 5V (1) Input Current 1 3.5V < VOUT 5V (1) (2) To be measured at VIN at no load To be measured at VOUT in switch off condition ISWITCHING ILEAKAGE VLX = 0.4V VLX = 6V VIN = VOUT x 0.9 VIN = VOUT x 0.9 EN = VOUT EN = 0V FMAX DOSC On (VLX " L" ) side LX switch on ----60 Input Current 2 LX Switching Current 3.5V < VOUT 5V (1) (2) 3.5V < VOUT 5V (2) mA 80 -0.4x VOUT ---0.5 80 65 0.65 LX Leakage Current EN "H" Level EN " L" Level EN " H" Input Current EN " L" Input Current Maximum Oscillator Frequency Oscillator Duty Cycle VLX Voltage Limit Notes: (1)Unless otherwise provided, VIN = 1.8V, VSS = 0V, IOUT = 10mA, TOPT = 25C, and use External Circuit of Typical Application (2)Unless otherwise provided, VIN = 3V, VSS= 0V, IOUT = 10mA, TOPT = 25C, and External Circuit of Typical Application DS9261/A-12 March 2007 www.richtek.com 7 RT9261/A Electrical Characteristics Parameter Output Voltage Accuracy Input Voltage Start-up Voltage Efficiency VOUT 3.5V VOUT 3.5V VOUT 3.5V VOUT 3.5V VOUT 3.5V (1) (2) Preliminary (Refer to Figure 4) Symbol VOUT VIN VST IOUT = 1mA, VIN : 0 2V Test Conditions Min -2 ----To be measured at VIN at no load To be measured at VOUT in switch off condition VEXT = VOUT - 0.4V ----1.5 (2) Typ --0.85 75 85 30 60 6 --------120 75 0.8 Max +2 7 1.0 --50 90 10 -----0.2 0.5 -160 85 1.0 Units % V V % A A 3.5V < VOUT 5V (1) Input Current 1 3.5V < VOUT 5V (1) (2) Input Current 2 EXT "H" Output Current EXT "L" Output Current EN "H" Level EN " L" Level 3.5V < VOUT 5V (1) (2) 3.5V < VOUT 5V (1) mA -2 1.5 3.5V < VOUT 5V (2) VEXT = 0.4V VIN = VOUT x 0.9 VIN = VOUT x 0.9 EN = VOUT EN = 0V FMAX DOSC On (VLX " L" ) side LX switch on mA V V A A kHz % V 2 0.4x VOUT ---0.5 80 65 0.65 EN " H" Input Current EN " L" Input Current Maximum Oscillator Frequency Oscillator Duty Cycle VLX Voltage Limit Notes: (1)Unless otherwise provided, VIN = 1.8V, VSS = 0V, IOUT = 10mA, TOPT = 25C, and use External Circuit of Typical Application (2)Unless otherwise provided, VIN = 3V, VSS= 0V, IOUT = 10mA, TOPT www.richtek.com 8 DS9261/A-12 March 2007 Preliminary Typical Operating Characteristics Start-up/Hold-on Voltage vs. Output Current 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 10 20 30 40 50 120 RT9261/A Output Current vs. Ripple Voltage Start-up/Hold-on Voltage Vstart/Vhold (V) Ripple Voltage (mV p-p) Vstart 100 80 Vhold 2.0V 60 2.5V 1.5V 40 20 0 0 20 40 60 80 100 RT9261 VOUT = 2.7V 0.9V RT9261 VOUT = 2.7V Output Current (mA) Output Current (mA) Output Voltage vs. Output Current 3 2.5 Output Voltage vs. Temperature 2.90 1.5V 0.9V 1.0V 2.0V 2.5V 2.85 Output Voltage (V) Output Voltage (V) 2 1.5 1 0.5 0 0 20 40 60 80 100 2.80 2.75 2.70 2.65 2.60 -40 -20 0 20 40 60 80 RT9261 VOUT = 2.7V RT9261 VOUT = 2.7V Output Current (mA) Temperature (C) Efficiency vs. Output Current 90 80 70 60 Supply Current vs. Temperature RT9261 VOUT = 2.7V 1.5V Supply Current (uA) 70 2.0V 1.0V 0.9V 2.5V 50 40 30 20 10 0 Efficiency (%) 60 50 40 30 20 10 0 0 20 Input Current 2 Input Current 1 RT9261 VOUT = 2.7V 40 60 80 100 -40 -20 0 20 40 60 80 Output Current (mA) DS9261/A-12 March 2007 Temperature (C) www.richtek.com 9 RT9261/A Preliminary Maximum Oscillator Frequency (kHz) A Maximum Oscillator Frequency vs. Temperature 160 140 3 2.5 Output Voltage vs. Output Current 2.5V 1.5V 1.0V 0.9V 2.0V Output Voltage (V) RT9261 VOUT = 2.7V -40 -20 0 20 40 60 80 120 100 80 60 40 20 0 2 1.5 1 0.5 0 0 30 60 90 RT9261A VOUT = 2.7V 120 150 Temperature (C) Output Current (mA) Oscillator Duty Cycle vs. Temperature 100 80 70 Efficiency vs. Output Current 2.5V 0.9V 1.0V 40 30 20 Oscillator Duty Cycle (%) 90 60 2.0V 1.5V Efficiency (%) RT9261 VOUT = 2.7V 80 50 70 60 10 0 RT9261A VOUT = 2.7V 0 30 60 90 120 150 50 -40 -20 0 20 40 60 80 Temperature (C) Output Current (mA) Start-up/Hold-on Voltage vs. Output Current 1.6 120 100 Output Current vs. Ripple Voltage Start-up/Hold-on Voltage1 Vstart/Vhold (V) 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 30 60 90 120 150 Vstart Ripple Voltage (mV p-p) 2.5V 80 2.0V 60 Vhold 1.5V 40 20 0 0 30 60 90 120 150 0.9V RT9261A VOUT = 2.7V RT9261A VOUT = 2.7V Output Current (mA) www.richtek.com 10 Output Current (mA) DS9261/A-12 March 2007 Preliminary Outline Dimension RT9261/A H D L C B b A A1 e Symbol A A1 B b C D e H L Dimensions In Millimeters Min 0.889 0.000 1.397 0.356 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.559 2.997 3.099 1.041 0.254 0.610 Dimensions In Inches Min 0.035 0.000 0.055 0.014 0.102 0.106 0.033 0.003 0.012 Max 0.051 0.006 0.071 0.022 0.118 0.122 0.041 0.010 0.024 SOT-23-5 Surface Mount Package DS9261/A-12 March 2007 www.richtek.com 11 RT9261/A Preliminary D D1 A C B C1 e e H A b b Dimensions In Inches Min 0.055 0.014 0.094 0.016 0.155 0.031 0.173 0.055 0.057 0.014 Max 0.063 0.019 0.102 0.021 0.167 0.047 0.181 0.069 0.061 0.017 b1 Symbol A b B b1 C C1 D D1 e H Dimensions In Millimeters Min 1.397 0.356 2.388 0.406 3.937 0.787 4.394 1.397 1.448 0.356 Max 1.600 0.483 2.591 0.533 4.242 1.194 4.597 1.753 1.549 0.432 3-Lead SOT-89 Surface Mount Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Richtek Technology Corporation Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com www.richtek.com 12 DS9261/A-12 March 2007 |
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