TK11821 DC-DC CONVERTER FEATURES APPLICATIONS ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Very Low Noise Very Small Size Few External Components Wide Supply Voltage Range (0.9 to 10 V) Sinewave Oscillator Selectable Output Voltages 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. TK11821M 821 21 A 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. OSC 1 8 VFB VD BYPASS 2 7 GND 3 6 VIN 4 5 VO T1 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. BLOCK DIAGRAM The TK11821 is available in an 8-pin plastic surface mount (MFP-8) package. External inductive components are also available. VFB OSC VD 5 1 2 4 VIN ORDERING INFORMATION 6 VO Feedback Control TK11821M Tape/Reel Code GND 5 T1 3 BYPASS 7 V REF TAPE/REEL CODE BX: TL: MG: January, 1996 TOKO, Inc. Bulk/Bag Tape Left Magazine 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 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Input Current IO = 0 , VO = 10 V 3.5 7.0 mA Output Voltage IO = 50 µA, VO = 10 V IO = 0 µA, 1.6 V ≤ VIN ≤ 2.0 V 22.5 5.5 24.0 9.0 25.5 mA V VO - T1 shorted, IO = 50 µA 9.6 10.0 10.4 V 90 100 µA IO Output Current VO - T1 shorted Load Reg Load Regulation Note 2 0.1 ∆V O/TA Output Voltage Temperature Dependency VO = 24 V, IO = 50 µA +2.3 mV/°C VO = 10 V, IO = 50 µA -1.5 mV/°C VOSC-S Oscillation Starting Voltage IO = 0 µA fOSC Oscillation Frequency IO = 0 µA, Note 2 0.35 0.75 % V 4.0 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 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Input Current IO = 0 , VO = 10 V 3.5 7.0 mA Output Voltage IO = 50 µA, VO = 10 V IO = 0 µA, 1.6 V ≤ VIN ≤ 2.0 V 22.5 5.5 24.0 9.0 25.5 mA V V O - T1 shorted, IO = 50 µA 9.6 10.0 10.4 V 90 100 µA IO Output Current V O - T1 shorted Load Reg Load Regulation Note 2 0.1 ∆VO/TA Output Voltage Temperature Dependency V O = 24 V, IO = 50 µA +2.3 mV/°C V O = 10 V, IO = 50 µA -1.5 mV/°C V OSC-S Oscillation Starting Voltage IO = 0 µA fOSC Oscillation Frequency IO = 0 µA, Note 2 Note 1: Note 2: Note 3: Note 4: Page 2 0.35 1.5 % V 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 µA). 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 January, 1996 TOKO, Inc. TK11821 TEST CIRCUIT The value of the circuit constants against the input voltage. V IN 22 µF + T L INPUT VOLTAGE 0.1 µF 1 6 3 4 CB CA TOKO COIL PART NUMBER 821 GND + CA 0.9 V to 2 V 1 µF 33 pF 10 pF PS5CDLN-1250 1.8 V to 10 V 820 pF 33 pF PS5CDLN-1303 VO The output voltage is 24 V. When connected between the VO and the T terminal, the output voltage will be 10 V. C2 0.1 µF CB TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT VOLTAGE vs. OUTPUT CURRENT 10 V OUTPUT OUTPUT VOLTAGE vs. INPUT VOLTAGE 10 V OUTPUT 0 µA 10 V IN = 4 V 10 40 µA INPUT CURRENT vs. INPUT VOLTAGE 10 V OUTPUT TA = 25°C IO = 120 µA 10 80 µA 5 IIN (mA) V O (V) V O (V) IO = 80 µA TA = 25 °C 120 µA VIN = 3 V 5 IO = 40 µA 5 VIN = 2 V TA = 25 °C 0 0 0.4 0.8 1.2 1.6 VIN (V) IO = 0 µA VIN = 1 V 0 0 2.0 0.2 TPC01 0.4 0.6 I O (mA) 0.8 0 1.0 0 TA = 25 °C 0.8 1.2 2.0 TPC03 OUTPUT VOLTAGE vs. OUTPUT CURRENT 24 V OUTPUT TA= 25°C 20 1.6 VIN (V) INPUT CURRENT vs. INPUT VOLTAGE 24 V OUTPUT OUTPUT VOLTAGE vs. INPUT VOLTAGE 24 V OUTPUT 0.4 TPC02 TA = 25°C 10 IO = 0 µA IIN (mA) V O (V) IO = 40 µA IO = 80 µA 10 IO = 80 µA IO = 120 µA V O (V) 24 IO = 40 µA 10 V IN = 2 V 5 3V 4V 5V IO = 120 µA IO = 0 µA 0 0 0 0.8 1.6 2.4 V IN (V) January, 1996 TOKO, Inc. 3.2 4.0 TPC04 0 0.8 1.6 2.4 V IN (V) 1-30-96 3.2 4.0 TPC05 0 0 0.2 0.4 0.6 I O (mA) 0.8 1.0 TPC06 Page 3 TK11821 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) OUTPUT VOLTAGE vs. TEMPERATURE 10.3 24.6 10.2 24.5 10.1 24.4 10.0 24.3 9.9 VO = 24 V V O(V) V O (V) VO = 10 V 24.2 0 -30 -20 0 20 TEMP (°C) 40 60 TK11821 • TPC07 TYPICAL AM/FM VARACTOR DIODE BIAS CIRCUIT VIN T + 1 6 3 4 821 GND 1 PIN 0.1 + C A h 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 4.4 ± 0.2 e1 5.5 1.27 5 e 1 1.27 Recommended Mount Pad 4 0°~10° ± 0.2 0.5 ± 0.2 0.12 M e 1.27 0.15 1.7max ± 0.2 +0.1 -0.01 0.1min 0.4 1.4 +0.1 -0.05 5.0 6.0 ± 0.3 0.1 Unit:mm 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. © 1993 Toko America, Inc. All Rights Reserved 1-30-96 Order this literature by: IC-109-TK11821 Page 5 Printed in U.S.A.