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TC1304-1H1EUNTR Fiches technique(PDF) 8 Page - Microchip Technology |
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TC1304-1H1EUNTR Fiches technique(HTML) 8 Page - Microchip Technology |
8 / 38 page TC1303A/TC1303B/TC1303C/TC1304 DS21949C-page 8 © 2008 Microchip Technology Inc. Synchronous Buck Regulator (VOUT1) Adjustable Output Voltage Range VOUT1 0.8 — 4.5 V Adjustable Reference Feedback Voltage (VFB1) VFB1 0.78 0.8 0.82 V Feedback Input Bias Current (IFB1) IVFB1 —-1.5 — nA Output Voltage Tolerance Fixed (VOUT1) VOUT1 -2.5 ±0.3 +2.5 % Note 2 Line Regulation (VOUT1)VLINE-REG — 0.2 — %/V VIN =VR+1V to 5.5V, ILOAD = 100 mA Load Regulation (VOUT1)VLOAD-REG —0.2 — % VIN =VR +1.5V, ILOAD = 100 mA to 500 mA (Note 1) Dropout Voltage VOUT1 VIN – VOUT1 — 280 — mV IOUT1 = 500 mA, VOUT1 =3.3V (Note 5) Internal Oscillator Frequency FOSC 1.6 2.0 2.4 MHz Start Up Time TSS —0.5 — ms TR = 10% to 90% RDSon P-Channel RDSon-P — 450 — m Ω IP=100 mA RDSon N-Channel RDSon-N — 450 — m Ω IN=100 mA LX Pin Leakage Current ILX -1.0 ±0.01 1.0 μA SHDN = 0V, VIN = 5.5V, LX = 0V, LX = 5.5V Positive Current Limit Threshold +ILX(MAX) — 700 — mA LDO Output (VOUT2) Output Voltage Tolerance (VOUT2)VOUT2 -2.5 ±0.3 +2.5 % Note 2 Temperature Coefficient TCVOUT — 25 — ppm/°C Note 3 Line Regulation ∆VOUT2/ ∆VIN -0.2 ±0.02 +0.2 %/V (VR+1V) ≤ VIN ≤ 5.5V Load Regulation, VOUT2 ≥ 2.5V ∆VOUT2/ IOUT2 -0.75 -0.08 +0.75 %IOUT2 = 0.1 mA to 300 mA (Note 4) Load Regulation, VOUT2 < 2.5V ∆VOUT2/ IOUT2 -0.9 -0.18 +0.9 %IOUT2 = 0.1 mA to 300 mA (Note 4) Dropout Voltage VOUT2 > 2.5V VIN – VOUT2 — 137 205 300 500 mV IOUT2 = 200 mA (Note 5) IOUT2 = 300 mA Power Supply Rejection Ratio PSRR — 62 — dB f ≤ 100 Hz, IOUT1 = IOUT2 = 50 mA, CIN = 0 µF Output Noise eN — 1.8 — µV/(Hz)½ f ≤ 1 kHz, IOUT2 =50mA, SHDN1 =GND DC CHARACTERISTICS (CONTINUED) Electrical Characteristics: VIN1 =VIN2 = SHDN1,2 = 3.6V, COUT1 =CIN = 4.7 µF, COUT2 =1µF, L = 4.7 µH, VOUT1 (ADJ) = 1.8V, IOUT1 = 100 mA, IOUT2 = 0.1 mA TA = +25°C. Boldface specifications apply over the TA range of -40°C to +85°C. Parameters Sym Min Typ Max Units Conditions Note 1: The Minimum VIN has to meet two conditions: VIN ≥ 2.7V and VIN ≥ VRX + VDROPOUT, VRX = VR1 or VR2. 2: VRX is the regulator output voltage setting. 3: TCVOUT2 = ((VOUT2max – VOUT2min) * 106)/(VOUT2 * DT). 4: Regulation is measured at a constant junction temperature using low duty-cycle pulse testing. Load regulation is tested over a load range from 0.1 mA to the maximum specified output current. 5: Dropout voltage is defined as the input-to-output voltage differential at which the output voltage drops 2% below its nominal value measured at a 1V differential. 6: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air. (i.e. TA, TJ, θJA). Exceeding the maximum allowable power dissipation causes the device to initiate thermal shutdown. 7: The integrated MOSFET switches have an integral diode from the LX pin to VIN, and from LX to PGND. In cases where these diodes are forward-biased, the package power dissipation limits must be adhered to. Thermal protection is not able to limit the junction temperature for these cases. 8: VIN1 and VIN2 are supplied by the same input source. |
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