Step-up DC-DC converter / white LED driver IC

www.DataSheet4U.com POWER&RF Step-up DC-DC converter / white LED driver IC 昇圧型DC-DCコンバータ / 白色LEDドライバIC TK11840L-G DESCRIPTION The TK11840L-G is a step-up DC-DC converter that drives an external NPN power transistor using a constant frequency PWM architecture. The IC works with a wide operating supply range (1.8V to 10V) and has an adjustable output. The IC timing oscillator operating frequency is programmable and can be set up to 1MHz. It also incorporates a soft-start circuit and a short-circuit detection function of a timer-latch type. TK11840L-GはPWM方式のスイッチングレギュレータコン トローラです。動作電源電圧は1.8Vから10Vです。発振周波 数は1MHｚまで調節可能です。ソフトスタート機能・タイ マーラッチ式短絡検出機能を内蔵しております。 FEATURES Operation from 1.8V to 10.0V supply Adjustable output voltage High speed adjustable OSC: up to 1MHz Incorporates a soft start circuit Incorporates a short circuit detection of a timer-latch Totem-pole type output in which drive current is adjustable using an switching resistor: pin 4 1µA or less shutdown current Small package: SOT23L-8 低動作最低電源電圧: VOP=1.8~10.0V 出力電圧調整可能 高速動作が可能: 最大1MHz ソフトスタート回路内蔵 タイマーラッチ式短絡検出回路内蔵 出力はトーテムポール形式でスイッチングTr.ドライブ電流調整可能 (NPNスイッチングトランジスタ対応) 1µA以下のシャットダウン電流 小型パッケージ: SOT23L-8 APPLICATIONS The White LED Driving Systems: 2 to 48 or more For Back-lighting and Front-lighting, Flashlights etc. Mobile Communication Systems: Cellular Phone, PHS, DSC, PDA, Computer Peripheral Equipment Battery & Dry Cell Battery Systems Portable Equipment Step-up DC-DC Converter (Voltage Supply) Camera, Radio, Communications Equipment etc VCD Bias 白色LED駆動システム: バックライト, フロントライト, フラッシュライトなど モバイル通信機器: 携帯電話、PHS、DSC、PDA、 コンピュータ周辺機器 バッテリー駆動機器 携帯機器 昇圧型DC-DCコンバータ カメラ、ラジオ、その他通信機 VCDバイアス PACKAGE OUTLINE Part name TK11840L-G Package Marking Pin configuration D40 See next page ORDERING INFORMATION Ordering information TK11840LTL-G SOT23L-8 Package code L: SOT23L-8 Environment code G: Lead free Storage direction TL: Left type ABSOLUTE MAXIMUM RATINGS Parameter Operating Voltage Range Operating Temperature Range Power Dissipation Operating Frequency Range 項目 Symbol 記号 VOP 動作電圧範囲 TOP 動作温度範囲 PD 許容消費電力 動作周波数範囲 fOP Rating 定格 1.8 to 10.0 -20 to +85 400 to 1 Unit 単位 Remarks V °C mW MHz 備考 2005 SPRING POWER&RF ELECTRICAL CHARCTERISTICS Parameter 項目 Switch Maximum Voltage スイッチ最大電圧 Switch Maximum Current スイッチ最大電流 Switch Maximum Base Current スイッチ最大ベース電流 Maximum Duty Ratio 最大デューティ比 Error Amplifier Reference Voltageエラーアンプ基準電圧 Quiescent Current 静止動作電流 Shutdown Supply Current シャットダウン電源電流 Symbol 記号 VSW, max ISW, peak IOut, max DMAX VEA IIN, ON IIN,OFF MIN Value TYP MAX Units 単位 VIN=2.0V, TA=25°C Conditions 条件 Depending on external Tr. Depending on external Tr. 65 0.48 75 0.50 5.0 0.1 50 85 0.52 9.0 1 mA % V mA uA Adjustable by RB BLOCK DIAGRAM EaIn FB 1 8 0.1µF SCP OSC 2 Soft Start Short Circuit Protection OSC VCC 7 RT 3kΩ CT 270pF Vcc 3 1µF BR/CTL RB 620Ω Reference Voltage Supply 1.3V Output Drive Control Circuit 6 GND 4 5 Out 2005 SPRING POWER&RF 6 WHITE LED DRIVER APPLICATION WITH ON/OFF CONTROL Designed Performance Input Voltage LED Current Oscillation Frequency Inductor Peak Current Coil (TOKO) List of common components VIN=2.5 to 10.0V ILED=20mA 260kHz 560mA Type D52LC A914BYW-100M Parameter Coil Input Capacitor Output Capacitor Short Circuit Protection Resistor Bias Resistor Time Capacitor Time Resistor Feedback Capacitor VOUT Symbol Value L CIN COUT CSCP RB CT RT CFB 10 4.7 2.2 0.1 2 270 6.8 0.1 Unit µH µF µF µF kΩ pF kΩ µF TK11840L 1 CSCP VIN 2 3 RB 4 Ealn SCP VCC BR/CTL L FB OSC GND VOUT 8 7 6 5 CFB CT RT Sw.Tr. D CTL CIN COUT RLED 16 WHITE LED DRIVER APPLICATION Designed Performance Input Voltage LED Current Oscillation Frequency Inductor Peak Current Coil (TOKO) List of common components VIN=12±1V ILED=20mA+20mA 440kHz 300mA Type D52LC A914BYW-470M Parameter Coil Input Capacitor Output Capacitor Short Circuit Protection Resistor Bias Resistor Time Capacitor Time Resistor Feedback Capacitor Symbol Value L CIN COUT CSCP RB CT RT CFB VOUT 47 4.7 10 0.1 2 1000 1 0.1 Unit µH µF µF µF kΩ pF kΩ µF TK11840L 1 CSCP VIN.IC CIN.IC 1µF 2 3 RB 4 Ealn SCP VCC BR/CTL L VIN CIN FB OSC GND VOUT 8 7 6 5 CFB CT RT Sw.Tr. D COUT 24Ω 24Ω 2005 SPRING POWER&RF VOUT=32V STEP-UP DC-DC CONVERTER FOR LDC/VCD BIAS APPLICATION Designed Performance Input Voltage VIN=4.5 to 5.5V Output Current IOUT=up to 10mA Output Voltage VOUT=32V Oscillation Frequency 110kHz Inductor Peak Current 250mA Coil (TOKO) Type D52LC A914BYW-101M List of common components Parameter Coil Input Capacitor Output Capacitor Short Circuit Protection Resistor Bias Resistor Time Capacitor Time Resistor Feedback Capacitor VOUT R2 CR2 360kΩ 1000pF R1 5.6kΩ Symbol Value L CIN COUT CSCP RB CT RT CFB 100 4.7 10 0.1 2 1000 4.7 0.1 Unit µH µF µF µF kΩ pF kΩ µF TK11840L 1 CSCP VIN 2 3 RB 4 Ealn SCP VCC BR/CTL L FB OSC GND VOUT 8 7 6 5 CFB CT RT Sw.Tr. D CIN COUT VOUT=5V STEP-UP DC-DC CONVERTER FOR SPEAKER DRIVER APPLICATION Designed Performance Input Voltage Output Current Output Voltage Oscillation Frequency Inductor Peak Current Coil (TOKO) List of common components VIN=3.0 to 4.0V IOUT=up to 300mA VOUT=5.0V 740kHz 800mA Type D412F 972AS-4R7M Parameter Coil Input Capacitor Output Capacitor Short Circuit Protection Resistor Bias Resistor Time Capacitor Time Resistor Feedback Capacitor VOUT R2 68kΩ R1 7.5kΩ CR2 10pF Symbol Value L CIN COUT CSCP RB CT RT CFB 4.7 4.7 22 0.1 1 270 2.2 0.1 Unit µH µF µF µF kΩ pF kΩ µF TK11840L 1 CSCP VIN 2 3 RB 4 Ealn SCP VCC BR/CTL L FB OSC GND VOUT 8 7 6 5 RFB CFB 2.2kΩ CT RT Sw.Tr. D CIN COUT * Please inquire us about applications except above. 上記以外のアプリケーションについてはお問い合わせ下さい。 2005 SPRING