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TC1226EUA Datasheet(PDF) 2 Page - Microchip Technology |
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TC1226EUA Datasheet(HTML) 2 Page - Microchip Technology |
2 / 9 page 2 Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters TC1225 TC1226 TC1227 TC1225/6/7-1 3/24/00 © 2001 Microchip Technology Inc. DS21369A PIN DESCRIPTION Pin Number Name Description 1 C1– C1 Commutation Capacitor Negative Terminal. 2 C2+ C2 Commutation Capacitor Positive Terminal. 3 C2– C2 Commutation Capacitor Negative Terminal. 4 –2VIN Doubling Inverting Charge Pump Output (–2 x VIN). 5 GND Ground. 6VIN Positive Power Supply Input. 7 C1+ C1 Commutation Capacitor Positive Terminal. 8–VIN Inverting Charge Pump Output (–1 x VIN). 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 Power Dissipation (TA ≤ 70°C) MSOP-8 ............... 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. ELECTRICAL CHARACTERISTICS: TA = –40°C to +85°C, VIN = +5V, C1 = 3.3µF, C2 = 1µF (TC1225); C1 = 1µF, C2 = 0.33 µF (TC1226); C1 = 0.33µF, C2 = 0.1µF (TC1227) unless otherwise noted. Typical values are at TA = +25°C. Symbol Parameter Device Test Conditions Min Typ Max Unit IDD Supply Current TC1225 — 75 120 µA TC1226 — 200 360 TC1227 — 625 1500 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 TC1225 8.4 12 15.6 kHz TC1226 24.5 35 45.5 TC1227 65 125 170 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 -2VIN Output ROUT2 Output Resistance All ILOAD = 0.1mA to 1mA — 135 420 Ω for –2VIN output (Note 1) No Load at -VIN Output NOTES: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1/ pump frequency x capacitance)]. |
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