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| Preliminary RT9300A/B Tiny Package, Low Dropout Current Source General Description The RT9300A/B low-dropout bias supply for white LEDs is a high-performance alternative to the simple ballast resistors used in conventional white LED designs. The RT9300A/B uses a internal resistor to set the bias current for four LEDs, which are matched to 3%. The RT9300A/B's advantages over ballast resistors include much lower bias variation with supply voltage variation, significantly lower dropout voltage, and in some applications, significantly improved efficiency. The RT9300A/B requires a 60/45mV dropout at a 20/15mA load on each output to match the LED brightness. Features Low 60/45mV Dropout at 20/15mA 3% LED Current Matching Simple LED Brightness Control 2.5V to 5.5V Supply Voltage Range Thermal Shutdown Protection RoHS Compliant and 100% Lead (Pb)-Free Applications Next-Generation Wireless Handsets PDAs, Palmtops, and Handy Terminals Digital Cameras, Camcorders Battery-Powered Equipment Ordering Information RT9300A/B Package Type E : SOT-23-6 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Sink Current A : 20mA B : 15mA Pin Configurations (TOP VIEW) LED1 LED2 LED3 6 1 EN 5 2 4 3 GND LED4 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. SOT-23-6 Note : There is no pin1 indicator on top mark for SOT-23-6 type, and pin 1 will be lower left pin when reading top mark from left to right. Typical Application Circuit VIN C 0.1uF 6 LED1 PWM 1 EN 5 LED2 4 LED3 3 LED4 RT9300A/B GND 2 Figure 1. Application circuit for backlight. DS9300A/B-02 March 2007 www.richtek.com 1 RT9300A/B VIN Preliminary Keypad LED C 0.1uF 6 LED1 PWM 1 EN 5 LED2 4 LED3 3 LED4 RT9300A/B GND 2 Figure 2. Application circuit for keypad. Function Block Diagram EN LED2 LED4 LED1 LED3 Bandgap VREF + - UVLO Current Source OTP IREF Functional Pin Description Pin 1 2 3 Name EN GND LED4 Chip Enable (Active High). Ground LED4 Cathode Connection. Current flowing into LED4 is Constant. (20mA/15 mA) LED4 is High Impedance when EN is Low. LED3 Cathode Connection. Current flowing into LED3 is Constant. (20mA/15 mA) LED3 is High Impedance when EN is Low. LED2 Cathode Connection. Current flowing into LED2 is Constant. (20mA/15 mA) LED2 is High Impedance when EN is Low. LED1 Cathode Connection. Current flowing into LED1 is Constant. (20mA/15 mA) LED1 is High Impedance when EN is Low. Function 4 LED3 5 LED2 6 LED1 www.richtek.com 2 DS9300A/B-02 March 2007 Preliminary Absolute Maximum Ratings (Note 1) RT9300A/B Supply Input Voltage -------------------------------------------------------------------------------------------------- -0.3V to 6V The other pins ---------------------------------------------------------------------------------------------------------- -0.3V to 6V Power Dissipation, PD @ TA = 25C SOT-23-6 ---------------------------------------------------------------------------------------------------------------- 0.4W Package Thermal Resistance (Note 3) SOT-23-6, JA --------------------------------------------------------------------------------------------------------------------------------------------------------- 250C/W Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260C Operation Temperature Range ------------------------------------------------------------------------------------- -40C to 85C Junction Temperature ------------------------------------------------------------------------------------------------- 0C to 125C Storage Temperature Range ---------------------------------------------------------------------------------------- -65C to 150C ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V Electrical Characteristics (VIN = 3.7V, TA = 25C, Unless Otherwise specification) Parameter System Supply Input Operation Voltage Range Under Voltage Lock Out UVLO Hysteresis LED Maximum Sink Current Quiescent Current LED Dropout Voltage LED Current Deviation Matching Digital Input High Level Digital Input Low Level OTP OTP Hysteresis Shut Down Current Initial Current Symbol VEN V(UVLO) Test Condition Min 2.5 --- Typ -2.1 100 20 15 -60 45 ---170 10 -20 15 Max 5.5 ----600 --3 -0.7 --1 22 16.5 Units V V mV mA uA mV % V V C C uA mA RT9300A RT9300B IEN IOUT = 0, ILED = 20mA ILED = 15mA VIH VIL VEN > VIH for enable VEN < VIL for disable ------2.5 ---- IEN RT9300A RT9300B VEN = 0.4V -18 13.5 DS9300A/B-02 March 2007 www.richtek.com 3 RT9300A/B Preliminary 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. JA is measured in the natural convection at T A = 25C on a low effective thermal conductivity test board (Single Layer, 1S) of JEDEC 51-3 therm\al measurement standard. Note 4. Floating connection or pull low to disable this function. www.richtek.com 4 DS9300A/B-02 March 2007 Preliminary Typical Operating Characteristics LED Current vs. Input Voltage 18 16 18 16 RT9300A/B Output Current vs. VEN LED Current (mA) 12 10 8 6 4 2 0 2 2.5 3 LED 1 LED 2 LED 3 LED 4 Output Current (mA) 4 4.5 5 14 14 12 10 8 6 4 2 0 3.5 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 Input Voltage (V) VEN (V) LED Current vs. Temperature 15.5 400 350 IEN Current vs. VEN Supply Voltage VIN = 3.5V 15.4 300 LED Current (mA) I EN Current (uA) -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 15.3 250 200 150 100 50 15.2 15.1 15 0 1.5 2 2.5 3 3.5 4 4.5 Temperature (C) VEN Supply Voltage (V) Dimming Operation EN Pin Shutdown Response VEN = 0V to 3V (2V/Div) EN Pin Voltage EN Pin Voltage (2V/Div) LED Current (10mA/Div) LED Current (10mA/Div) Time (50s/Div) Time (50s/Div) DS9300A/B-02 March 2007 www.richtek.com 5 RT9300A/B VIN Transient Response VIN = 3.2V to 3.7V Preliminary Input Voltage (1V/Div) LED Current (25mA/Div) Time (100s/Div) www.richtek.com 6 DS9300A/B-02 March 2007 Preliminary Outline Dimension RT9300A/B 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 0.250 2.591 2.692 0.838 0.080 0.300 Max 1.295 0.152 1.803 0.560 2.997 3.099 1.041 0.254 0.610 Dimensions In Inches Min 0.031 0.000 0.055 0.010 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-23-6 Surface Mount Package 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 DS9300A/B-02 March 2007 www.richtek.com 7 |
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