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MC33264DM-3.3 Datasheet(PDF) 5 Page - ON Semiconductor |
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MC33264DM-3.3 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 8 page MC33264 5 MOTOROLA ANALOG IC DEVICE DATA Figure 7. Regulator Output Voltage Trim Vin Vout 3.0, 3.3 or 5.0 V 3.3 µF 0.01 N/C N/C R2 R1 2 3 Gnd Adj 65 4 Base 7 Vout Vin 1 8 On/Off Control Input 3.3 µF On/Off The complete equation for the output voltage is: Vout + Vref 1 ) R1 R2 ) I FB R1 where Vref is the nominal 1.235 V reference voltage and IFB is the feedback pin bias current, nominally –20 nA. The minimum recommended load current of 1.0 µA forces an upper limit of 1.2 M Ω on the value of R2, if the regulator must work with no load. IFB will produce a 2% typical error in Vout which may be eliminated at room temperature by adjusting R1. For better accuracy, choosing R2 = 100 K reduces this error to 0.17% while increasing the resistor program current to 12 µA. Output Noise In many applications it is desirable to reduce the noise present at the output. Reducing the regulator bandwidth by increasing the size of the output capacitor is the only method for reducing noise. Noise can be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity for the MC33264D–5.0. Pick C BYPASS + 1 2 π R1 x 200 Hz or about 0.01 µF. When doing this, the output capacitor must be increased to 3.3 µF to maintain stability. These changes reduce the output noise from 430 µV to 100 Vrms for a 100 kHz bandwidth for the 5.0 V output device. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages. TYPICAL APPLICATIONS Figure 8. Lithium Ion Battery Cell Charger Unregulated Input 6.0 to 10 Vdc 2 3 6 4 7 1 8 5 Gnd On/Off Vin Vout Base Adj MC33264D–5.0 Ground 1N4001 0.22 200 k 1% 100 k 1% 50 k Control N/C N/C 0.1 Lithium Ion Rechargeable Cell 4.2 V ± 0.15 V On/Off |
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Similar Description - MC33264DM-3.3 |
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