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TDA3668AT Datasheet(PDF) 6 Page - NXP Semiconductors |
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TDA3668AT Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 16 page 2000 Feb 01 6 Philips Semiconductors Preliminary specification Very low dropout voltage/quiescent current 5 V regulator with overvoltage switch off TDA3668AT TEST AND APPLICATION INFORMATION handbook, halfpage MGS591 VP 81 2, 3, 6, 7 C2 TDA3668AT 10 µF C1(1) 1 µF VREG = 5 V Fig.4 Test circuit. (1) C1 is optional (to minimize supply noise only). Fig.5 Curve for selecting the value of the output capacitor. (1) Maximum ESR at 200 µA ≤ IREG ≤ 100 mA. (2) Minimum ESR only when IREG ≤ 200 µA. handbook, halfpage MDA961 ESR ( Ω) C2 ( µF) 102 10 1 10−1 10−1 110 102 stable region (2) (1) Noise The output noise is determined by the value of the output capacitor. The noise figure is measured at a bandwidth of 10 Hz to 100 kHz (see Table 1). Table 1 Noise figures Stability The regulator is stabilized with an external capacitor connected to the output. The value of this capacitor can be selected using the diagrams shown in Figs 5 and 6. The following four examples show the effects of the stabilization circuit using different values for the output capacitor. OUTPUT CURRENT IREG (mA) NOISE FIGURE ( µV) C2 = 10 µFC2 = 47 µF C2 = 100 µF 0.5 550 320 300 50 650 400 400 handbook, halfpage MDA962 ESR ( Ω) IREG (mA) 103 102 10 22 1 10−1 110 103 102 stable region Fig.6 ESR as a function of IREG for selecting the value of the output capacitor. |
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