TDA3664T 查看數據表（PDF） - Philips Electronics
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TDA3664T Datasheet PDF : 16 Pages
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Philips Semiconductors
Very low dropout voltage/quiescent
current 5 V voltage regulator
Preliminary specification
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.
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.
handbook, halfpVaPge
C1(1)
1 µF
1
3
TDA3664
2, 4
REG(3)
C2(2)
MDA960
(1) C1 is optional (to minimize supply noise only).
(2) C2 ≤ 4700 µF.
(3) VREG = 5 V.
APPLICATION CIRCUITS
The maximum output current of the regulator equals:
Fig.7 Application circuit with backup functionality
(SOT223 version).
Io(max) = R-----t-h---(-j----a-1-)--5-×--0---(--–-V----TP----a–--m---V-b---R---E---G-----) = -1---0-1--0-5----0×-----–(--V--T---P-a---m–---b--5----) (mA)
When Tamb = 21 °C, the maximum output current equals
140 mA at VP =14 V.
1999 Sep 01
7
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