DD212 SITI | Alldatasheet
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Technical content
新竹市科學園區展業一路九號四樓之三新竹市科學園區展業一路九號四樓之三新竹市科學園區展業一路九號四樓之三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 DD212 Version : Preliminary Issue Date : 2004/04/26 File Name : DD212_pre.doc Total Pages : 11 HIGH POWER CHARGE PUMP FOR WHITE LEDS WITH LOW SUPPLY VOLTAGE
點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DD212
040712 DD212_pre -1- Version：：：：Preliminary
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
/circle6 Low supply voltage, 1.5V~5.5V /circle6 Only one external component, a capacitor needed /circle6 High power output 400mA@VDD=3V /circle6 Low shutdown supply current /circle6 It is easy to package DD212 within a LED module
Applications
/circle6 White LED Indicators’ drivers /circle6 White LED Back lighters for low-voltage wireless handsets
點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DD212
040712 DD212_pre -2- Version：：：：Preliminary
CN Negative Node of the External Capacitor CP Positive Node of the External Capacitor VDD Power EN VSS CN CP VDD SiTI DD212 Top View Block Diagram OSC EN VDD VSS CHARGE PUMP CPCN
點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DD212
040712 DD212_pre -3- Version：：：：Preliminary
Absolute Maximum Ratings (Unless otherwise noted, TA = 25 °°°°C ) Characteristic Symbol Rating Unit Supply Voltage VDD - VSS -0.3 ~5.5 V Output Sourcing Current IDD 700 mA Power Dissipation P d 4.5 mW Operating Temperature Range T OPR -40 ~ 85 °°°°C Storage Temperature Range T STG -55 ~ 150 °°°°C Junction Temperature TJ 160 °°°°C Recommended Operating Conditions ITEM SYMBOL MIN. TYP . MAX. UNIT Supply Voltage VDD - VSS 1.5 2.5 5.5 V External Capacitance Cext - 1 - uF
Electrical Characteristics
(Cext=1uF, TA= 25°C, VDD= 2.5V ) Characteristic Symbols Condition Min. Typ. Max. Unit Operating Current I DD No external LED, Cext=0.1uF - - 0.75 mA Output Current for ‘ON’ Cycle IFON V F of external LED=3.2V 480 500 520 mA Time-Average Output Current IFAVG V F of external LED=3.2V 240 250 260 mA Output Voltage for ‘ON’ Cycle VLEDAON No external LED - 5.0 (x2VDD) - V Output Voltage for ‘OFF’ Cycle VLEDAOFF No external LED - 2.5 (x1VDD) - V Frequency of the Internal Oscillator Freq - 350 - kHz Duty Cycle of the Internal Oscillator Dt - 50 - % Output Resistance Ro 4 5 ΩΩΩΩ
點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DD212
040712 DD212_pre -4- Version：：：：Preliminary
1.5 ~5.5 V CN CP Rext Cext SiTISiTISiTISiTI DD212DD212DD212DD212 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. IF VLEDA (Without LED) IFON 2VDD VDD Dt 1/Freq
點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DD212
040712 DD212_pre -5- Version：：：：Preliminary
Package Specifications (SOT-25) DIMENSIONS IN MILLIMETERS SYMBOL MIN NOM MAX A 1.00 1.10 1.30 A1 0.00 － 0.10 A2 0.70 0.80 0.90 b 0.35 0.40 0.50 C 0.10 0.15 0.25 D 2.70 2.90 3.10 E 1.40 1.60 1.80 e － 1.90(TYP) － H 2.60 2.80 3.00 L 0.37 － － θ1 1 ° 5 ° 9 ° D E H b A1 e AA2 C L
點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. DD212
040712 DD212_pre -6- Version：：：：Preliminary
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 a bove. 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 em ployees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation.