TDA3664T PHILIPS [NXP Semiconductors], TDA3664T Datasheet - Page 7

• Manufacturer Part Number: TDA3664T
• Description: Very low dropout voltage/quiescent current 5 V voltage regulator
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Example 1
The regulator is stabilized with an electrolytic output
capacitor of 68 F (ESR = 0.5 ). At 40 C, the capacitor
value is decreased to 22 F and the ESR is increased to
3.5 . The regulator will remain stable at a temperature of
Example 2
The regulator is stabilized with an electrolytic output
capacitor of 10 F (ESR = 3.3 ). At 40 C, the capacitor
value is decreased to 3 F and the ESR is increased to
20 . The regulator will remain stable at a temperature of
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 A.
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 F on the output.
The regulator is now stable under all conditions and
independent of:
A
The maximum output current of the regulator equals:
When T
140 mA at V
1999 Sep 01
40 C.
40 C.
I
PPLICATION CIRCUITS
o max
The ESR of the electrolytic capacitor
The value of the electrolytic capacitor
The output current.
Very low dropout voltage/quiescent
current 5 V voltage regulator
amb
=
----------------------------------------------------- -
R
= 21 C, the maximum output current equals
P
th(j-a)
=14 V.
150 T
–
V
P
amb
–
V
REG
=
------------------------------------ - (mA)
100
150 T
–
V
P
amb
–
5
7
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 A).
The application circuit is given in Fig.7.
handbook, halfpage
(1) C1 is optional (to minimize supply noise only).
(2) C2
(3) V
Fig.7
REG
V P
4700 F.
Application circuit with backup functionality
(SOT223 version).
= 5 V.
C1
1 F
(1)
1
TDA3664
2, 4
3
Preliminary specification
MDA960
C2
(2)
REG
TDA3664
(3)