RT9183 Ultra Low Dropout 1.5A Linear Regulator General Description Features The RT9183 series are high performance linear voltage regulators that provide ultra low-dropout voltage, high output current with low ground current. It operates from an input of 2.3V to 5.5V and provides output current up to 1.5A thus is suitable to drive digital circuits requiring low voltage at high currents. z The RT9183 has superior regulation over variations in line and load. Also it provides fast respond to step changes in load. Other features include over-current and overtemperature protection. The adjustable version has enable pin to reduce power consumption in shutdown mode. z z z z z z z z 1.8V, 2.5V, 3.3V and as an adjustable device with a 0.8V reference voltage. The RT9183 regulators are available in 3-lead SOT-223 and TO-263 packages (fixed output only for the 3-lead option). Also available are 5-lead TO-263 and fused SOP-8 packages with two external resistors to set the output voltage ranges from 0.8V to 4.5V. Excellent Line and Load Regulation 0.1μ μA Quiescent Current in Shutdown Mode Guaranteed 1.5A Output Current Fixed Output Voltages : 1.2V, 1.8V, 2.5V, 3.3V Adjustable Output Voltage from 0.8V to 4.5V Over-Temperature/Over-Current Protection RoHS Compliant and 100% Lead (Pb)-Free Applications z The devices are available in fixed output voltages of 1.2V, 330mV Dropout @ 1.5A 380μ μA Low Ground Pin Current z z z Battery-Powered Equipment Mother Board/Graphic Card Peripheral Cards PCMCIA Card Pin Configurations (TOP VIEW) Ordering Information RT9183 Package Type G : SOT-223 GF : SOT-223 (F-Type) S : SOP-8 M : TO-263 M5 : TO-263-5 1 2 3 1 2 3 VIN GND (TAB) VOUT GND VOUT (TAB) VIN SOT-223 (F-Type) SOT-223 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage Defauit : Adjustable 12 : 1.2V 18 : 1.8V 25 : 2.5V 33 : 3.3V H : Chip Enable High L : Chip Enable Low 1 2 1 3 2 3 4 5 EN VIN VOUT ADJ GND(TAB) VIN VOUT GND(TAB) TO-263-5 TO-263 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. DS9183-12 March 2007 EN 8 GND VIN 2 7 GND VOUT 3 6 GND ADJ 4 5 GND SOP-8 www.richtek.com 1 RT9183 Typical Application Circuit (SOT-223 & TO-263) VIN VIN = 3.3V RT9183 VOUT VOUT 2.5V, 1.5A GND CIN COUT 10uF 10uF Figure 1. 3.3V to 2.5V Regulator (SOP-8 & TO-263-5) VIN VIN RT9183 VOUT VOUT R1 Enable C 0.1uF CIN 10uF EN GND ADJ R2 VOUT = 0.8 × (1 + COUT 10uF R1 )Volts R2 Note: The value of R2 should be less than 80k to maintain regulation. Figure 2. Adjustable Operation (SOP-8 & TO-263-5) VIN Enable C 0.1uF CIN 10uF VIN RT9183 VOUT EN GND ADJ VOUT COUT 10uF Figure 3. Fixed Operation with SOP-8 and TO-263-5 packages www.richtek.com 2 DS9183-12 March 2007 RT9183 Functional Pin Description Pin Name EN Pin Function Chip Enable Control Input. Note that the device will be in the unstable state if the pin is not connected. VIN Supply Input GND Common Ground VOUT Regulator Output The output voltage is set by the internal feedback resistors when this pin ADJ grounded. If external feedback resistors are applied, the output voltage will be: VOUT = 0.8 × (1 + R1 ) Volts R2 Function Block Diagram VIN Current Limit Sensor + 0.8V Reference Error Amplifier - + VOUT EN Shutdown Logic Thermal Shutdown ADJ + Output Mode Comparator DS9183-12 March 2007 100mV GND www.richtek.com 3 RT9183 Absolute Maximum Ratings z z z z z z z (Note 1) Supply Input Voltage -----------------------------------------------------------------------------------------------------Package Thermal Resistance SOT-223, θJA ---------------------------------------------------------------------------------------------------------------SOT-223, θJC --------------------------------------------------------------------------------------------------------------SOT-223 (F-Type), θJA ---------------------------------------------------------------------------------------------------SOT-223 (F-Type), θJC ---------------------------------------------------------------------------------------------------SOP-8, θJA -----------------------------------------------------------------------------------------------------------------SOP-8, θJC -----------------------------------------------------------------------------------------------------------------TO-263, θJA ----------------------------------------------------------------------------------------------------------------TO-263, θJC ----------------------------------------------------------------------------------------------------------------Power Dissipation, PD@TA = 25°C SOT-223 --------------------------------------------------------------------------------------------------------------------SOT-223 (F-Type) ---------------------------------------------------------------------------------------------------------SOP-8 -----------------------------------------------------------------------------------------------------------------------TO-263 ----------------------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Junction Temperature ----------------------------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 2) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------ Recommended Operating Conditions z z 6V 115°C/W 15°C/W 135°C/W 17°C/W 125°C/W 20°C/W 45°C/W 8°C/W 0.87W 0.74W 0.8W 2.22W 260°C 150°C −65°C to 150°C 2kV 200V (Note 3) Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.3V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C Electrical Characteristics (VIN = VOUT + 0.7V, CIN =COUT = 10μF (Ceramic), TA = 25°C unless otherwise specified) Parameter Output Voltage Accuracy (Fixed Output Voltage) Symbol ΔV OUT Test Conditions IOUT = 10mA Min Typ Max Units −2 0 +2 % 0.8 -- 4.5 V Output Voltage Range (Adjustable) VOUT_ADJ Quiescent Current IQ IOUT = 0mA, Enable -- 380 500 μA ISTBY V IN = 5.5V, Shutdown -- 0.1 1 μA 2 3.2 4.2 A IOUT = 0.5A -- 110 300 IOUT = 1.0A -- 220 400 IOUT = 1.5A -- 330 500 -- 0.035 0.18 Standby Current (Note 6) (Note 7) Current Limit Dropout Voltage Line Regulation ILIM (Note 4) VDROP ΔV LINE V OUT + 0.7V < VIN < 5.5V IOUT = 10mA mV %/V To be continued www.richtek.com 4 DS9183-12 March 2007 RT9183 Parameter Load Regulation (Note 5) (Fixed Output Voltage) Symbol ΔVLOAD Test Conditions 1mA < IOUT < 1.5A Min Typ Max Units -- 22 45 mV Thermal Shutdown Temperature TSD -- 170 -- °C Thermal Shutdown Hysteresis ΔTSD -- 30 -- °C EN Threshold Logic-Low Voltage VIL VIN = 5.5V -- -- 0.6 Logic-High Voltage VIH VIN = 5.5V 1.8 -- -- IEN VIN = 5.5V, Enable -- 0.1 1 μA 0.784 0.8 0.816 V -- 10 100 nA 0.05 0.1 0.2 V Enable Pin Current V ADJ Reference Voltage Tolerance VREF Adjust Pin Current IADJ Adjust Pin Threshold VTH(ADJ) VADJ = VREF Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV. Note 5. Regulation is measured at constant junction temperature by using a 20ms current pulse. Devices are tested for load regulation in the load range from 10mA to 1.5A. Note 6. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ = IIN - IOUT under no load condition (IOUT = 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin current. Note 7. Standby current is the input current drawn by a regulator when the output voltage is disabled by a shutdown signal (VEN >1.8V ). It is measured with VIN = 5.5V. Note 8. θJA is measured in natural convection (still air) at TA = 25°C with the component mounted on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. And the cooper area of PCB layout is 4mm x 2.5mm on SOT-223, 14mm x 14mm on TO-263 for thermal measurement. DS9183-12 March 2007 www.richtek.com 5 RT9183 Typical Operating Characteristics Output Voltage vs. Temperature Output Voltage vs. Temperature 2.6 VIN = 5V, RL = ∞ CIN = COUT = 10uF (Ceramic,Y5V) 1.85 Output Voltage (V) Output Voltage (V) 1.9 1.8 1.75 VIN = 5V, RL = ∞ CIN = COUT = 10uF (Ceramic,Y5V) 2.55 2.5 2.45 RT9183H-18CS RT9183-25CG 2.4 1.7 -50 -25 0 25 50 75 100 -50 125 -25 0 75 100 125 400 Quiescent Current (uA) 1 Quiescent Current (uA) 1 50 Quiescent Current vs. Temperature Quiescent Current vs. Temperature 400 380 360 340 VIN = 5V, RL = ∞ CIN = COUT = 10uF (Ceramic,Y5V) 320 380 360 340 VIN = 5V, RL = ∞ CIN = COUT = 10uF (Ceramic,Y5V) 320 RT9183H-18CS 300 RT9183-25CG 300 -50 -25 0 25 50 75 100 125 -50 -25 0 Temperature (°C) 25 50 75 100 125 Temperature (°C) Current Limit vs. Temperature Current Limit vs. Temperature 4 4 VIN = 5V, CIN = COUT = 10uF(Ceramic,Y5V) VIN = 5V, CIN = COUT = 10uF(Ceramic,Y5V) 3.8 Current Limit (A) 3.8 Current Limit (A) 25 Temperature (°C) Temperature (°C) 3.6 3.4 3.2 3.6 3.4 3.2 RT9183L-33CM5 RT9183-25CG 3 3 -50 -25 0 25 50 75 Temperature (°C) www.richtek.com 6 100 125 -50 -25 0 25 50 75 100 125 Temperature (°C) DS9183-12 March 2007 RT9183 Dropout vs. Voltage Dropout Voltage Load Current Dropout Voltage Load Current Dropoutvs. Voltage 500 500 Dropout Voltage (mV) Dropout Voltage (mV) 1 TJ = 125°C TJ = 125°C 400 300 TJ = +25°C 200 TJ = -40°C 100 400 300 TJ = +25°C 200 TJ = -40°C 100 RT9183-25CG RT9183L-33CM5 0 0 0.6 0.9 1.2 0 1.5 0.3 0.6 0.9 1.2 Load Current (A) Load Current (A) Dropout Voltage vs. Load Current Load Transient Response RT9183H-CS VOUT = 3.3V 1.5 COUT = 47uF/Low ESR, ILOAD = 1mA to 750mA TJ= 125°C 300 TJ= 25°C 1 0.5 0 200 TJ= -40°C 100 Output Voltage Deviation(mV) Dropout Voltage (mV) 400 0.3 Load Current (A) 0 20 0 -20 RT9183H-18CS 0 0 0.3 0.6 0.9 1.2 1.5 Time (100us/Div) Load Current (A) Load Transient Regulation Load Current (A) COUT = 47uF/Low ESR, ILOAD = 1mA to 1.5A 2 1 0 Output Voltage Deviation(mV) Load Transient Response RT9183-12CGF 20 0 0 -50 RT9183H-18CS Time (100us/Div) DS9183-12 March 2007 Load Current (mA) Output Voltage Deviation(mV) 50 500 0 ILOAD = 1mA to 750mA COUT = 47uF/Low ESR Time (100us/Div) www.richtek.com 7 RT9183 Line Transient Response COUT = 47uF/Low ESR 5 COUT = 47uF/Low ESR, ILOAD = 100mA 5 4 4 Output Voltage Deviation(mV) Output Voltage Deviation(mV) Input Voltage Deviation(V) ILOAD = 100mA Input Voltage Deviation(V) Line Transient Regulation 10 0 10 0 -10 RT9183H-18CS RT9183-12CGF Time (100us/Div) Time (100us/Div) EN Pin Shutdown Threshold vs. Temperature EN Pin Shutdown Response EN Voltage (V) CIN = COUT = 10uF (Ceramic,Y5V) 1 VOUT Off to On ILOAD = 100mA, VIN = 5V, TA =25°C 5 0 0.9 Output Voltage (V) Shutdown Threshold Voltage (V) 1 1.1 VOUT On to Off 0.8 RT9183L-33CM5 2 1 0 RT9183H-18CS 0.7 -50 -25 0 25 50 75 100 125 Temperature (°C) Time (500us/Div) Reference Voltage vs. Temperature 0.85 Reference Voltage (V) VIN = 5V,CIN = COUT = 10uF (Electrolysis) 0.83 0.81 0.79 0.77 RT9183H-CS 0.75 -50 -25 0 25 50 75 100 125 Temperature (°C) www.richtek.com 8 DS9183-12 March 2007 RT9183 Application Information Like any low-dropout regulator, the RT9183 series requires input and output decoupling capacitors. These capacitors must be correctly selected for good performance (see Capacitor Characteristics Section). Please note that linear regulators with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient decoupling capacitance. Input Capacitor An input capacitance of ≅10μF is required between the device input pin and ground directly (the amount of the capacitance may be increased without limit). The input capacitor MUST be located less than 1 cm from the device to assure input stability (see PCB Layout Section). A lower ESR capacitor allows the use of less capacitance, while higher ESR type (like aluminum electrolytic) require more capacitance. Capacitor types (aluminum, ceramic and tantalum) can be mixed in parallel, but the total equivalent input capacitance/ ESR must be defined as above to stable operation. There are no requirements for the ESR on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be ≅10μF over the entire operating temperature range. Output Capacitor The RT9183 is designed specifically to work with very small ceramic output capacitors. The recommended minimum capacitance (temperature characteristics X7R or X5R) are 10μF to 47μF range with 10mΩ to 25mΩ range ceramic capacitors between each LDO output and GND for transient stability, but it may be increased without limit. Higher capacitance values help to improve transient. The output capacitor's ESR is critical because it forms a zero to provide phase lead which is required for loop stability. DS9183-12 March 2007 No Load Stability The device will remain stable and in regulation with no external load. This is specially important in CMOS RAM keep-alive applications. Input-Output (Dropout) Voltage A regulator's minimum input-to-output voltage differential (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the device uses a PMOS, its dropout voltage is a function of drain-to-source on-resistance, RDS(ON), multiplied by the load current: VDROPOUT = VIN - VOUT = RDS(ON) × IOUT Current Limit The RT9183 monitors and controls the PMOS' gate voltage, minimum limiting the output current to 2A . The output can be shorted to ground for an indefinite period of time without damaging the part. Short-Circuit Protection The device is short circuit protected and in the event of a peak over-current condition, the short-circuit control loop will rapidly drive the output PMOS pass element off. Once the power pass element shuts down, the control loop will rapidly cycle the output on and off until the average power dissipation causes the thermal shutdown circuit to respond to servo the on/off cycling to a lower frequency. Please refer to the section on thermal information for power dissipation calculations. Capaacitor Characteristics It is important to note that capacitance tolerance and variation with temperature must be taken into consideration when selecting a capacitor so that the minimum required amount of capacitance is provided over the full operating temperature range. In general, a good tantalum capacitor will show very little capacitance variation with temperature, but a ceramic may not be as good (depending on dielectric type). Aluminum electrolytics also typically have large temperature variation of capacitance value. www.richtek.com 9 RT9183 Equally important to consider is a capacitor's ESR change with temperature: this is not an issue with ceramics, as their ESR is extremely low. However, it is very important in tantalum and aluminum electrolytic capacitors. Both show increasing ESR at colder temperatures, but the increase in aluminum electrolytic capacitors is so severe they may not be feasible for some applications. Ceramic: For values of capacitance in the 10μF to 100μF range, ceramics are usually larger and more costly than tantalums but give superior AC performance for by-passing high frequency noise because of very low ESR (typically less than 10mΩ). However, some dielectric types do not have good capacitance characteristics as a function of voltage and temperature. Z5U and Y5V dielectric ceramics have capacitance that drops severely with applied voltage. A typical Z5U or Y5V capacitor can lose 60% of its rated capacitance with half of the rated voltage applied to it. The Z5U and Y5V also exhibit a severe temperature effect, losing more than 50% of nominal capacitance at high and low limits of the temperature range. X7R and X5R dielectric ceramic capacitors are strongly recommended if ceramics are used, as they typically maintain a capacitance range within ± 20% of nominal over full operating ratings of temperature and voltage. Of course, they are typically larger and more costly than Z5U/ Y5U types for a given voltage and capacitance. Tantalum: Solid tantalum capacitors are recommended for use on the output because their typical ESR is very close to the ideal value required for loop compensation. They also work well as input capacitors if selected to meet the ESR requirements previously listed. Tantalums also have good temperature stability: a good quality tantalum will typically show a capacitance value that varies less than 10~15% across the full temperature range of 125°C to -40°C. ESR will vary only about 2X going from the high to low temperature limits. www.richtek.com 10 The increasing ESR at lower temperatures can cause oscillations when marginal quality capacitors are used (if the ESR of the capacitor is near the upper limit of the stability range at room temperature). Aluminum: This capacitor type offers the most capacitance for the money. The disadvantages are that they are larger in physical size, not widely available in surface mount, and have poor AC performance (especially at higher frequencies) due to higher ESR and ESL. Compared by size, the ESR of an aluminum electrolytic is higher than either Tantalum or ceramic, and it also varies greatly with temperature. A typical aluminum electrolytic can exhibit an ESR increase of as much as 50X when going from 25°C down to -40°C. It should also be noted that many aluminum electrolytics only specify impedance at a frequency of 120Hz, which indicates they have poor high frequency performance. Only aluminum electrolytics that have an impedance specified at a higher frequency (between 20kHz and 100kHz) should be used for the device. Derating must be applied to the manufacturer's ESR specification, since it is typically only valid at room temperature. Any applications using aluminum electrolytics should be thoroughly tested at the lowest ambient operating temperature where ESR is maximum. Thermal Considerations Thermal protection limits power dissipation in RT9183. When the operation junction temperature exceeds 170°C, the OTP circuit starts the thermal shutdown function and turns the pass element off. The pass element turns on again after the junction temperature cools by 30°C. For continuous operation, do not exceed absolute maximum operation junction temperature 125°C. The power dissipation definition in device is: PD = (VIN − VOUT) x IOUT + VIN x IQ DS9183-12 March 2007 RT9183 The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula: PD(MAX) = ( TJ(MAX) - TA ) /θJA Where T J(MAX) is the maximum operation junction temperature 125°C, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of RT9183, where T J(MAX) is the maximum junction temperature of the die (125°C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (θJA is layout dependent) for SOT-223 package is 115°C/W, SOT-223 package (F-Type) is 135°C/W, SOP-8 package is 125°C/W, and TO-263 package is 45°C/W on standard JEDEC 51-3 thermal test board. The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance θJA. For RT9183 packages, the Figure 4 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. The best way to do this is to layout CIN and COUT near the device with short traces to the VIN, VOUT, and ground pins. The regulator ground pin should be connected to the external circuit ground so that the regulator and its capacitors have a“ single point ground” . It should be noted that stability problems have been seen in applications where “ vias ” to an internal ground plane were used at the ground points of the device and the input and output capacitors. This was caused by varying ground potentials at these nodes resulting from current flowing through the ground plane. Using a single point ground technique for the regulator and it's capacitors fixed the problem. Since high current flows through the traces going into VIN and coming from VOUT, Kelvin connect the capacitor leads to these pins so there is no voltage drop in series with the input and output capacitors. Optimum performance can only be achieved when the device is mounted on a PC board according to the diagram below: PCB Layout 2400 Maximum power dissipation (mW) Good board layout practices must be used or instability can be induced because of ground loops and voltage drops. The input and output capacitors MUST be directly connected to the input, output, and ground pins of the device using traces which have no other currents flowing through them. TO-263 2000 GND 1600 1200 SOT-223 SOP-8 800 ADJ + EN SOT-223 (F-Type) 400 0 0 25 50 75 100 VOUT 125 + (°C) Ambient temperature (℃) + Figure 4 GND VIN GND SOP-8 Board Layout DS9183-12 March 2007 www.richtek.com 11 RT9183 Adjustable Operation The adjustable version of the RT9183 has an output voltage range of 0.8V to 4.5V. The output voltage is set by the ratio of two external resistors as shown in Figure 2. The value of R2 should be less than 80k to maintain regulation. In critical applications, small voltage drop is caused by the resistance (RT) of PC traces between the ground pin of the device and the return pin of R2 (See Figure 5 shown on next page). Note that the voltage drop across the external PC trace will add to the output voltage of the device. Optimum regulation will be obtained at the point where the return pin of R2 is connected to the ground pin of the device directly. (SOP-8 & TO-263-5) VIN VIN RT9183 VOUT EN ADJ VOUT R1 Enable C 0.1uF CIN 10uF GND RT R2 COUT 10uF Figure 5. Return Pin of External Resistor Connection Referring to Figure 3 the fixed voltage versions for both SOP-8 and TO-263-5 packages, the ADJ pin is the input to the error amplifier and MUST be tied the ground pin of the device directly otherwise it will be in the unstable state if the pin voltage more than 0.1V with respect to the ground pin itself. www.richtek.com 12 DS9183-12 March 2007 RT9183 Outline Dimension D D1 H C B L e L1 e A A1 b Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.450 1.803 0.057 0.071 A1 0.020 0.100 0.0008 0.0047 b 0.610 0.787 0.024 0.031 B 3.302 3.708 0.130 0.146 C 6.706 7.290 0.264 0.287 D 6.299 6.706 0.248 0.264 D1 2.896 3.150 0.114 0.124 e 2.261 2.362 0.089 0.093 H 0.229 0.330 0.009 0.013 L 1.550 1.950 0.061 0.077 L1 0.800 1.100 0.009 0.013 3-Lead SOT-223 Surface Mount Package DS9183-12 March 2007 www.richtek.com 13 RT9183 H A M J B F C I D Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 4.801 5.004 0.189 0.197 B 3.810 3.988 0.150 0.157 C 1.346 1.753 0.053 0.069 D 0.330 0.508 0.013 0.020 F 1.194 1.346 0.047 0.053 H 0.170 0.254 0.007 0.010 I 0.050 0.254 0.002 0.010 J 5.791 6.200 0.228 0.244 M 0.400 1.270 0.016 0.050 8-Lead SOP Plastic Package www.richtek.com 14 DS9183-12 March 2007 RT9183 C D U B V E L1 b1 L2 e b2 b A Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 4.064 4.826 0.160 0.190 B 1.143 1.676 0.045 0.066 b 0.660 0.914 0.026 0.036 b1 1.143 1.397 0.045 0.055 b2 0.305 0.584 0.012 0.023 C 1.143 1.397 0.045 0.055 D 9.652 10.668 0.380 0.420 E 8.128 9.652 0.320 0.380 e 2.286 2.794 0.090 0.110 L1 14.605 15.875 0.575 0.625 L2 2.286 2.794 0.090 0.110 U 6.223 Ref. 0.245 Ref. V 7.620 Ref. 0.300 Ref. 3-Lead TO- 263 Surface Mount DS9183-12 March 2007 www.richtek.com 15 RT9183 C D U B V E L1 L2 b e b2 A Dimensions In Millimeters Symbol Dimensions In Inches Min Max Min Max A 4.064 4.826 0.160 0.190 B 1.143 1.676 0.045 0.066 b 0.660 0.914 0.026 0.036 b2 0.305 0.584 0.012 0.023 C 1.143 1.397 0.045 0.055 D 9.652 10.668 0.380 0.420 E 8.128 9.652 0.320 0.380 e 1.524 1.829 0.060 0.072 L1 14.605 15.875 0.575 0.625 L2 2.286 2.794 0.090 0.110 U 6.223 Ref. 0.245 Ref. V 7.620 Ref. 0.300 Ref. 5-Lead TO-263 Plastic Surface Mount Package Richtek Technology Corporation Richtek Technology Corporation Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)89191466 Fax: (8862)89191465 Email: [email protected] www.richtek.com 16 DS9183-12 March 2007