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TC1236EUN Folha de dados(PDF) 2 Page - Microchip Technology |
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TC1236EUN Folha de dados(HTML) 2 Page - Microchip Technology |
2 / 10 page 2 Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters with Shutdown TC1235 TC1236 TC1237 TC1235/6/7-1 3/24/00 © 2001 Microchip Technology Inc. DS21371A Power Dissipation (TA ≤ 70°C) MSOP-10 ............. 320mW Storage Temperature (Unbiased) ......... – 65 °C to +150°C Lead Temperature (Soldering, 10sec) .................. +260 °C *This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ABSOLUTE MAXIMUM RATINGS* Input Voltage (VIN to GND) ......................... +6.0V, – 0.3V Output Voltage (–VIN, –2VIN to GND) ........ –12.0V, + 0.3V Current at –VIN, –2VIN Pins ...................................... 10mA Short-Circuit Duration –VIN, –2VIN to GND ........ Indefinite Operating Temperature Range ............... – 40 °C to +85°C PIN DESCRIPTION Pin Number Name Description 1C1– C1 Commutation Capacitor Negative Terminal. 2 C2+ C2 Commutation Capacitor Positive Terminal. 3 NC No Connection. 4C2– C2 Commutation Capacitor Negative Terminal. 5 –2VIN Doubling Inverting Charge Pump Output (–2 x VIN). 6 GND Ground. 7VIN Positive Power Supply Input. 8 SHDN Shutdown Input (Active Low). 9 C1+ C1 Commutation Capacitor Positive Terminal. 10 –VIN Inverting Charge Pump Output (–1 x VIN). NOTES: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1 / pump frequency x capacitance)]. ELECTRICAL CHARACTERISTICS: TA = –40°C to +85°C, VIN = +5V, C1 = 3.3µF, C2 = 1µF (TC1235); C1 = 1µF, C2 = 0.33 µF (TC1236); C1 = 0.33µF, C2 = 0.1µF (TC1237), SHDN = VIN, unless otherwise noted. Typical values are at TA = +25°C. Symbol Parameter Device Test Conditions Min Typ Max Unit IDD Supply Current TC1235 SHDN = VIN — 75 120 µA TC1236 SHDN = VIN — 200 360 TC1237 SHDN = VIN — 625 1500 ISHDN Shutdown Supply Current All SHDN = GND, VIN = +5V — 0.1 1 µA VMIN Minimum Supply Voltage All RLOAD = 1kΩ for –VIN output 1.8 —— V RLOAD = 10kΩ for –2VIN output VMAX Maximum Supply Voltage All RLOAD = 1kΩ for –VIN output —— 5.5 V RLOAD = 10kΩ for –2VIN output FOSC Oscillator Frequency TC1235 8.4 12 15.6 kHz TC1236 24.5 35 45.5 TC1237 65 125 170 VIH Shutdown Input All VIN = VMIN to VMAX 1.4 —— V Logic High VIL Shutdown Input All VIN = VMIN to VMAX —— 0.4 V Logic low VEFF1 Voltage Conversion All RLOAD = ∞ for –VIN output 96 99.5 — % Efficiency (Stage 1) RLOAD = ∞ for –2VIN output VEFF2 Voltage Conversion All RLOAD = ∞ for –VIN output 94 99 — % Efficiency (Stage 2) RLOAD = ∞ for –2VIN output ROUT1 Output Resistance All ILOAD = 0.5mA to 5mA — 45 80 Ω for –VIN output (Note 1) No Load at -VIN Output ROUT2 Output Resistance All ILOAD = 0.1mA to 1mA — 135 420 Ω for –2VIN output (Note 1) No Load at -2VIN Output TWK1 Wake-Up Time TC1235 RLOAD = 1kΩ for -VIN Output — 650 — µsec From Shutdown Mode TC1236 RLOAD = 10kΩ for -2VIN Output — 250 — Stage 1 TC1237 — 100 — TWK2 Wake-Up Time TC1235 RLOAD = 1kΩ for -VIN Output — 750 — µsec From Shutdown Mode TC1236 RLOAD = 10kΩ for -2VIN Output — 280 — Stage 2 TC1237 — 120 |
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