DD212 Version Issue Date File Name Total Pages : Preliminary : 2004/04/26 : DD212_pre.doc : 11 HIGH POWER CHARGE PUMP FOR WHITE LEDS WITH LOW SUPPLY VOLTAGE 新竹市科學園區展業一路九號四樓之三 SILICON TOUCH TECHNOLOGY INC. No. 9, 4F-3 Chan-Yeh Road 1 Science-Based Industrial Park Tel：886-3-5645656 Fax：886-3-5645626 點晶科技股份有限公司 DD212 SILICON TOUCH TECHNOLOGY INC. DD212 HIGH POWER CHARGE PUMP FOR WHITE LEDS WITH LOW SUPPLY VOLTAGE General Description DD212 is designed specifically for driving a white LED as a light source with low supply voltage. Like a charge pump, DD212 doubles the supply voltage, but only requires one external component, a capacitor. The built-in oscillator generates a 50% duty-cycle and 350kHz-frequency clock. DD211 also consumes little power with CMOS integrated circuits. DD212 comes in a small die that makes packaging it within a LED module be easy. DD212’s small package, SOT25 occupies only little area for portable device, such as a handset. DD212 also has an EN pin to enable the chip, shutdown the DD212, the operation current is lower than 0.1uA. Features Low supply voltage, 1.5V~5.5V Only one external component, a capacitor needed High power output 400mA@VDD=3V Low shutdown supply current It is easy to package DD212 within a LED module Applications White LED Indicators’ drivers White LED Back lighters for low-voltage wireless handsets 040712 DD212_pre -1- Version：Preliminary 點晶科技股份有限公司 DD212 SILICON TOUCH TECHNOLOGY INC. Pin Descriptions PIN NAME DESCRIPTIONS EN Chip Enable VSS Ground CN Negative Node of the External Capacitor CP Positive Node of the External Capacitor VDD Power EN VDD VSS SiTI DD212 CN CP Top View Block Diagram VDD 5 1 CHARGE PUMP OSC EN 2 040712 DD212_pre VSS -2- 3 CN 4 CP Version：Preliminary 點晶科技股份有限公司 DD212 SILICON TOUCH TECHNOLOGY INC. Absolute Maximum Ratings (Unless otherwise noted, TA = 25 °C ) Characteristic Symbol Rating Unit VDD - VSS -0.3 ~5.5 V Output Sourcing Current IDD 700 mA Power Dissipation Pd 4.5 mW Operating Temperature Range TOPR -40 ~ 85 °C Storage Temperature Range TSTG -55 ~ 150 °C TJ 160 °C Supply Voltage Junction Temperature Recommended Operating Conditions ITEM Supply Voltage External Capacitance SYMBOL MIN. TYP. MAX. UNIT VDD - VSS 1.5 2.5 5.5 V Cext - 1 - uF Electrical Characteristics (Cext=1uF, TA= 25°C, VDD= 2.5V ) Characteristic Operating Current Output Current for ‘ON’ Cycle Time-Average Output Current Output Voltage for ‘ON’ Cycle Output Voltage for ‘OFF’ Cycle Frequency of the Internal Oscillator Duty Cycle of the Internal Oscillator Output Resistance 040712 DD212_pre Symbols Condition Min. Typ. Max. Unit - - 0.75 mA IDD No external LED, Cext=0.1uF IFON VF of external LED=3.2V 480 500 520 mA IFAVG VF of external LED=3.2V 240 250 260 mA - V - V VLEDAON No external LED - VLEDAOFF No external LED - 5.0 (x2VDD) 2.5 (x1VDD) Freq - 350 - kHz Dt - 50 - % 4 5 Ω Ro -3- Version：Preliminary 點晶科技股份有限公司 DD212 SILICON TOUCH TECHNOLOGY INC. Typical Application ON OFF EN VDD 1.5 ~5.5 V C1 SiTI DD212 VSS CN CP Rext Cext Functional Descriptions DD212 is designed to drive a White LED as a light source with low supply voltage. As typical application circuit shown, when the EN is on, DD212 will double the supply voltage to drive the external LED with 50% duty cycle. The resistor Rext is used to limit the driving current. IFON IF 2VDD VLEDA (Without LED) VDD Dt 1/Freq 040712 DD212_pre -4- Version：Preliminary 點晶科技股份有限公司 DD212 SILICON TOUCH TECHNOLOGY INC. Package Specifications (SOT-25) C E H L e θ1 D A2 A1 b SYMBOL 040712 DD212_pre A DIMENSIONS IN MILLIMETERS MIN NOM MAX A A1 1.00 0.00 1.10 － 1.30 0.10 A2 b C D E e 0.70 0.35 0.10 2.70 1.40 － 0.80 0.40 0.15 2.90 1.60 1.90(TYP) 0.90 0.50 0.25 3.10 1.80 － H L 2.60 0.37 2.80 － 3.00 － θ1 1° 5° 9° -5- Version：Preliminary 點晶科技股份有限公司 DD212 SILICON TOUCH TECHNOLOGY INC. The products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. Hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention equipment and the like. Misusing those products may directly or indirectly endanger human life, or cause injury and property loss. Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage of the products mentioned above. Anyone who purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all their officers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation. 040712 DD212_pre -6- Version：Preliminary