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TK11821MMG Datasheet(PDF) 1 Page - TOKO, Inc |
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TK11821MMG Datasheet(HTML) 1 Page - TOKO, Inc |
1 / 5 page January, 1996 TOKO, Inc. Page 1 TK11821 1-30-96 APPLICATIONS s Variable Capacitance and PIN Photodiode Bias s Portable Instrumentation s Radio Control Systems s Mobile Radios s Cellular Telephones s Cordless Telephones s Fiberoptic Receivers s Local Area Network (LAN) Receivers s Battery Operated Equipment FEATURES s Very Low Noise s Very Small Size s Few External Components s Wide Supply Voltage Range (0.9 to 10 V) s Sinewave Oscillator s Selectable Output Voltages TK11821M Tape/Reel Code TAPE/REEL CODE BX: Bulk/Bag TL: Tape Left MG: Magazine ORDERING INFORMATION DC-DC CONVERTER TK11821M BLOCK DIAGRAM 1 2 3 4 OSC VD BYPASS VO VIN 8 7 6 5 VFB GND T1 821 A21 DESCRIPTION The TK11821 is a low power, low input voltage DC-DC converter. The device has been optimized for variable capacitance diode and PIN photodiode bias applications. It generates 10 Vdc and 24 Vdc output voltages from an input voltage as low as 0.9 V. Since the built-in high frequency oscillator generates sinewaves, the TK11821 produces very low RF interfer- ence noise. The internal oscillator is capable of operation at frequencies as high as 6-8 MHz, therefore, interference filtering is simple and effective. This unique feature makes the TK11821 ideally suitable for RF and fiber optic receiver applications. The device is capable of operation in the 0.9 to 10 V power supply voltage range. The output voltage is 24 V when T1 is not connected. When T1 is connected to VO, the output voltage is set to 10 V. The TK11821 is available in an 8-pin plastic surface mount (MFP-8) package. External inductive components are also available. VO T1 GND BYPASS V REF VFB OSC Feedback Control 6 5 2 4 5 7 3 1 VD VIN |
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