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TC1240ECH Arkusz danych(PDF) 2 Page - Microchip Technology |
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2 / 16 page TC1240/TC1240A DS21516C-page 2 2003 Microchip Technology Inc. 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Input Voltage (VIN to GND) TC1240 ............................................. +4.5V, -0.3V TC1240A ........................................... +5.8V, -0.3V Output Voltage (VOUT to GND) TC1240 ....................................... +9.0V, VIN -0.3V TC1240A ................................... +11.6V, VIN -0.3V Current at VOUT Pin............................................50 mA Short-Circuit Duration: VOUT to GND .............Indefinite Thermal Resistance .......................................210°C/W Power Dissipation (TA = +25°C)........................600 mW Operating Temperature Range.............-40°C to +85°C Storage Temperature (Unbiased) .......-65°C to +150°C † Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. TC1240 ELECTRICAL SPECIFICATIONS Electrical Specifications: Unless otherwise noted, typical values apply at TA = +25°C. Minimum and maximum val- ues apply for TA = -40° to +85°C, and VIN = +2.8V, C1 = C2 = 3.3 µF, SHDN = GND. Parameters Sym Min Typ Max Units Conditions Supply Current IDD — 180 300 µA RLOAD = ∞ Shutdown Supply Current ISHDN — 0.1 1.0 µA SHDN = VIN Minimum Supply Voltage VMIN 2.5 — — V RLOAD = 1.0 kΩ Maximum Supply Voltage VMAX —— 4.0 V RLOAD = 1.0 kΩ Oscillator Frequency FOSC — 160 — kHz TA = -40°C to +85°C Switching Frequency (Note 1) FSW 40 80 125 kHz TA = -40°C to +85°C Shutdown Input Logic High VIH 1.4 — — V VIN = VMIN to VMAX Shutdown Input Logic Low VIL —— 0.4 V VIN = VMIN to VMAX Power Efficiency PEFF 86 93 — % RLOAD = 1.0 kΩ Voltage Conversion Efficiency VEFF 97.5 99.96 — % RLOAD = ∞ Output Resistance (Note 2) ROUT — — 17 — — 30 Ω RLOAD = 1.0 kΩ TA = -40°C to +85°C Note 1: Switching frequency is one-half internal oscillator frequency. 2: Capacitor contribution is approximately 26% of the output impedance [ESR = 1 / switching frequency x capacitance]. |
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