 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| TK11821 DC-DC CONVERTER FEATURES s s s s s s Very Low Noise Very Small Size Few External Components Wide Supply Voltage Range (0.9 to 10 V) Sinewave Oscillator Selectable Output Voltages APPLICATIONS s s s s s s s s s Variable Capacitance and PIN Photodiode Bias Portable Instrumentation Radio Control Systems Mobile Radios Cellular Telephones Cordless Telephones Fiberoptic Receivers Local Area Network (LAN) Receivers Battery Operated Equipment 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 interference 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. VFB 5 821 21 A TK11821M OSC VD BYPASS VO 1 2 3 4 8 7 VFB GND 6 VIN 5 T1 BLOCK DIAGRAM OSC 1 VD 2 4 VO ORDERING INFORMATION TK11821M Tape/Reel Code VIN 6 Feedback Control GND 7 5 T1 BYPASS V REF 3 TAPE/REEL CODE BX: TL: MG: Bulk/Bag Tape Left Magazine January, 1996 TOKO, Inc. 1-30-96 Page 1 TK11821 ABSOLUTE MAXIMUM RATINGS Input Voltage ............................................................ 10 V Output Voltage ......................................................... 26 V Output Current ..................................................... 0.5 mA Operating Voltage Range ............................... 0.9 to 10 V Power Dissipation (Note 1) ................................ 350 mW Junction Temperature .......................................... 150 C Storage Temperature Range ................... -55 to +150 C Operating Temperature Range ................. -20 to +70 C Lead Soldering Temp. (10 sec.) ........................... 260 C ELECTRICAL CHARACTERISTICS Test conditions: VIN = 0.9 V 2.0 V Operating Conditions: VIN = 1.1 V, TA = 25 C unless otherwise specified. SYMBOL ICC VO IO Load Reg V O/TA VOSC-S fOSC PARAMETER Input Current Output Voltage Output Current Load Regulation Output Voltage Temperature Dependency Oscillation Starting Voltage Oscillation Frequency TEST CONDITIONS IO = 0 , VO = 10 V IO = 50 A, VO = 10 V IO = 0 A, 1.6 V VIN 2.0 V VO - T1 shorted, IO = 50 A VO - T1 shorted Note 2 VO = 24 V, IO = 50 A VO = 10 V, IO = 50 A IO = 0 A IO = 0 A, Note 2 0.75 4.0 22.5 9.6 90 MIN TYP 3.5 5.5 24.0 10.0 100 0.1 +2.3 -1.5 0.35 MAX 7.0 9.0 25.5 10.4 UNITS mA mA V V A % mV/C mV/C V MHz ELECTRICAL CHARACTERISTICS Test conditions: VIN = 1.8 V 10.0 V Operating Conditions: VIN = 3.0 V, T A = 25 C unless otherwise specified. SYMBOL ICC VO IO Load Reg VO/TA V OSC-S fOSC Note 1: Note 2: Note 3: Note 4: PARAMETER Input Current Output Voltage Output Current Load Regulation Output Voltage Temperature Dependency Oscillation Starting Voltage Oscillation Frequency TEST CONDITIONS IO = 0 , VO = 10 V IO = 50 A, VO = 10 V IO = 0 A, 1.6 V VIN 2.0 V V O - T1 shorted, IO = 50 A V O - T1 shorted Note 2 V O = 24 V, IO = 50 A V O = 10 V, IO = 50 A IO = 0 A IO = 0 A, Note 2 MIN TYP 3.5 5.5 24.0 10.0 100 0.1 +2.3 -1.5 MAX 7.0 9.0 25.5 10.4 UNITS mA mA V V A 22.5 9.6 90 0.35 % mV/C mV/C V 1.5 3.5 MHz Power dissipation must be derated at the rate of 3 mW/C for operation at TA = 25 C and above. Use the same value for L that was used in the measurement circuit. Output Voltage Variation = (VO1/VO1) X 100 (%), VO1 = VO1 (no load) - VO1 (IO = 50 A). The circuit constants will be changed by the input voltage at the 0.9 V to 2.0 V range and 1.8 V to 10 V range. 1-30-96 Page 2 January, 1996 TOKO, Inc. TK11821 TEST CIRCUIT V IN The value of the circuit constants against the input voltage. + L 1 3 6 4 1 F VO The output voltage is 24 V. When connected between the VO and the T terminal, the output voltage will be 10 V. 821 GND 0.1 F T 22 F INPUT VOLTAGE 0.9 V to 2 V CA CB TOKO COIL PART NUMBER PS5CDLN-1250 PS5CDLN-1303 33 pF 10 pF 1.8 V to 10 V 820 pF 33 pF CA CB C2 0.1 F TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT VOLTAGE vs. INPUT VOLTAGE 10 V OUTPUT 10 0 A 40 A 80 A 120 A V O (V) 5 TA = 25 C 5 VIN = 2 V TA = 25 C 0 0 0.4 0.8 VIN (V) 1.2 1.6 2.0 TPC01 10 VIN = 3 V IIN (mA) V O (V) 0 0 OUTPUT VOLTAGE vs. INPUT VOLTAGE 24 V OUTPUT TA = 25 C 24 IO = 0 A IO = 40 A IIN (mA) V O (V) IO = 80 A 10 IO = 120 A 10 20 IO = 40 A V O (V) 0 0 0.8 1.6 V IN (V) 2.4 3.2 4.0 TPC04 0 0 0.8 1.6 V IN (V) 2.4 3.2 4.0 TPC05 January, 1996 TOKO, Inc. + OUTPUT VOLTAGE vs. OUTPUT CURRENT 10 V OUTPUT V IN = 4 V 10 INPUT CURRENT vs. INPUT VOLTAGE 10 V OUTPUT TA = 25C IO = 120 A IO = 80 A IO = 40 A 5 VIN = 1 V 0.2 0.4 0.6 I O (mA) 0.8 1.0 TPC02 IO = 0 A 0 0 0.4 0.8 VIN (V) 1.2 1.6 2.0 TPC03 INPUT CURRENT vs. INPUT VOLTAGE 24 V OUTPUT TA= 25C 10 OUTPUT VOLTAGE vs. OUTPUT CURRENT 24 V OUTPUT TA = 25C IO = 120 A IO = 80 A 5 V IN = 2 V 3V 4V 5V IO = 0 A 0 0 0.2 0.4 0.6 I O (mA) 0.8 1.0 TPC06 1-30-96 Page 3 TK11821 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) 10.3 10.2 VO = 10 V V O (V) V O(V) OUTPUT VOLTAGE vs. TEMPERATURE 24.6 24.5 24.4 24.3 10.1 10.0 9.9 VO = 24 V 24.2 0 -30 -20 0 20 TEMP (C) 40 60 TK11821 * TPC07 TYPICAL AM/FM VARACTOR DIODE BIAS CIRCUIT VIN T + 1 GND 3 4 1 PIN 6 821 0.1 h C A C B C 2 AM HIGH FM LOW TR TK 11821 BD FIG 01 Page 4 1-30-96 + January, 1996 TOKO, Inc. TK11821 PACKAGE OUTLINES MFP-8 0.76 8 5 1.27 4.4 0.2 e 1.27 1 4 Recommended Mount Pad e1 5.5 0.2 0.5 5.0 0.2 1.7max 0.2 +0.1 -0.05 0.4 +0.1 -0.01 e 0.1min 1.4 1.27 0.1 6.0 0.3 0.12 M 0.15 Marking Information 821 The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc. YOUR LOCAL REPRESENTATIVE IS: TOKO America, Inc. 1250 Feehanville Dr. Mt. Prospect, IL 60056 Tel: (800) PIK-TOKO Fax: (847) 699-1194 January, 1996 TOKO, Inc. (c) 1993 Toko America, Inc. All Rights Reserved 0~10 Unit:mm 1-30-96 Page 5 Printed in U.S.A. Order this literature by: IC-109-TK11821 |
Price & Availability of TK11821
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |