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6 page 
1999 Sep 01 6 Philips Semiconductors Preliminary specification Very low dropout voltage/quiescent current 5 V voltage regulator TDA3664 TEST AND APPLICATION INFORMATION Test information Application information NOISE The output noise is determined by the value of the output capacitor, see Table 1. Table 1 Noise figures Note 1. Measured at a bandwidth of 10 Hz to 100 kHz. STABILITY The regulator is stabilized with an external capacitor on the output. The value of this capacitor can be selected using the diagrams shown in Fig.5 and Fig.6. The four examples on the next page show the effects of the stabilization circuit using different values for the output capacitor. Fig.4 Test circuit (SOT223). handbook, halfpage MDA960 VP 13 2, 4 REG(3) C1(1) 1 µF C2(2) TDA3664 (1) C1 is optional (to minimize supply noise only). (2) C2 = 10 µF. (3) VREG =5V. OUTPUT CURRENT IO (mA) NOISE FIGURE ( µV)(1) CO =10 µFCO =47 µFCO = 100 µF 0.5 550 320 300 50 650 400 400 Fig.5 Curve for selecting the value of the output capacitor. (1) Maximum ESR (Equivalent Series resistance) 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) Fig.6 ESR dependency due to IREG for selecting the right type of output capacitor. handbook, halfpage MDA962 ESR ( Ω) IREG (mA) 103 102 10 22 1 10−1 110 103 102 stable region |
