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TDA3664 Datasheet(PDF) 7 Page - NXP Semiconductors |
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TDA3664 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 16 page 1999 Sep 01 7 Philips Semiconductors Preliminary specification Very low dropout voltage/quiescent current 5 V voltage regulator TDA3664 Example 1 The regulator is stabilized with an electrolytic output capacitor of 68 µF (ESR = 0.5 Ω). At −40 °C, the capacitor value is decreased to 22 µF and the ESR is increased to 3.5 Ω. The regulator will remain stable at a temperature of −40 °C. Example 2 The regulator is stabilized with an electrolytic output capacitor of 10 µF (ESR = 3.3 Ω). At −40 °C, the capacitor value is decreased to 3 µF and the ESR is increased to 20 Ω. The regulator will remain stable at a temperature of −40 °C. Example 3 The regulator is stabilized with a 100 nF MKT capacitor on the output. Full stability is guaranteed when the output current is over 200 µA. Because the thermal influence on this capacitor value is almost zero, the regulator will remain stable at a temperature of −40 °C. Example 4 The regulator is stabilized with a 100 nF capacitor in parallel with a electrolytic capacitor of 10 µF on the output. The regulator is now stable under all conditions and independent of: • The ESR of the electrolytic capacitor • The value of the electrolytic capacitor • The output current. APPLICATION CIRCUITS The maximum output current of the regulator equals: When Tamb =21 °C, the maximum output current equals 140 mA at VP =14 V. I o max () 150 T amb – R th(j-a) V P V REG – () × ------------------------------------------------------ 150 T amb – 100 V P 5 – () × ------------------------------------- (mA) == The total thermal resistance of the TDA3664 (SOT223 package) can be decreased to lower values when pin 4 and body of the package are soldered to the printed-circuit board. Application circuit with backup function Sometimes, a backup function is needed to supply, for example, a microprocessor for a short period of time when the supply voltage spikes to 0 V (or even −1 V). This function can be easily built with the TDA3664 by using a large output capacitor. When the supply voltage is 0 V (or −1 V), no large current will flow into the output pin out of this large output capacitor (only a few µA). The application circuit is given in Fig.7. Fig.7 Application circuit with backup functionality (SOT223 version). 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 ≤ 4700 µF. (3) VREG =5V. |
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