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TDA3663AT Datasheet(PDF) 5 Page - NXP Semiconductors |
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TDA3663AT Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 17 page 9397 750 15047 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 05 — 13 June 2005 5 of 17 Philips Semiconductors TDA3663 Very low dropout voltage/quiescent current 3.3 V voltage regulator 11. Application information 11.1 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 7). 11.2 Stability For stable operation: • The output capacitor ESR should not exceed 22 Ω (worst-case) • A minimum ESR may be required; see Table 8 • It is recommended not to use below 1 mA output current because of reduced phase margin • Use electrolytic capacitors for output capacity values of 1 µF and above 11.3 Application circuits The maximum output current of the regulator equals: When Tamb =21 °C and VP = 14 V the maximum output current equals 116 mA. The total thermal resistance of the TDA3663 can be decreased from 155 K/W to 30 K/W for the SO8 version. For the SO4 version it can be decreased from 100 K/W to 25 K/W when GND pins 2 and 4 of the package are soldered to the printed-circuit board. Table 7: Noise figures Output current IREG (mA) Noise figure ( µV) C2=10 µF C2=47 µF C2 = 100 µF 0.5 550 320 300 50 650 400 400 Table 8: Minimum ESR values required IREG (mA) C2 = 100 nF C2=1 µF C2=10 µF C2 = 100 µF 1> 0 Ω > 1.5 Ω >0 Ω >0 Ω 5> 0 Ω >0 Ω >0 Ω >0 Ω 10 > 0 Ω >0 Ω >0 Ω >0 Ω 100 > 0 Ω >0 Ω >0 Ω >0 Ω I REG max () 150 T amb – R th j a – () V P V REG – () × ---------------------------------------------------------- 150 T amb – 100 V P 3.3 – () × ---------------------------------------- mA () == |
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